1 GNU C Library NEWS -- history of user-visible changes.
2 Copyright (C) 1992-2017 Free Software Foundation, Inc.
3 See the end for copying conditions.
5 Please send GNU C library bug reports via <http://sourceware.org/bugzilla/>
6 using `glibc' in the "product" field.
10 * Unicode 10.0.0 Support: Character encoding, character type info, and
11 transliteration tables are all updated to Unicode 10.0.0, using
12 generator scripts contributed by Mike FABIAN (Red Hat).
14 * errno.h is now safe to use from C-preprocessed assembly language on all
15 supported operating systems. In this context, it will only define the
16 Exxxx constants, as preprocessor macros expanding to integer literals.
18 * The rpcgen, librpcsvc and related headers will only be built and
19 installed when glibc is configured with --enable-obsolete-rpc.
20 This allows alternative RPC implementations, like TIRPC, to be used
21 by default. Applications needing features missing from TIRPC should
22 consider the rpcsvc-proto project developed by Thorsten Kukuk (SUSE).
24 * The NIS(+) name service modules, libnss_nis, libnss_nisplus, and
25 libnss_compat, are deprecated, and will not be built or installed by
26 default. Replacement implementations based on TIRPC, which
27 additionally support IPv6, are available from
28 <https://github.com/thkukuk/libnss_{compat,nis,nisplus}>.
30 * The NIS(+) support library, libnsl, is deprecated. By default, a
31 compatibility shared library will be built and installed, but not
32 headers or development libraries.
34 Only a few NIS-related programs require this library.
35 A replacement implementation based on TIRPC is available from
36 <https://github.com/thkukuk/libnsl>. Like the replacement NIS(+)
37 name service modules, the replacement supports IPv6, and it can be
38 coinstalled with the compatibility shared library from glibc.
40 * New configure option --enable-obsolete-nsl will cause libnsl's
41 headers, and the NIS(+) name service modules, to be built and
42 installed. This option may be removed in a future release.
44 * Extensive new collation tests for Hungarian locales based on
45 "The Rules of Hungarian Orthography, 12th edition" and the work of
46 Egmont Koblinger (Bug 18934).
48 * The DNS stub resolver no longer performs EDNS fallback. If EDNS or DNSSEC
49 support is enabled, the configured recursive resolver must support EDNS.
50 (Responding to EDNS-enabled queries with responses which are not
51 EDNS-enabled is fine, but FORMERR responses are not.)
53 * res_mkquery and res_nmkquery no longer support the IQUERY opcode. DNS
54 servers have not supported this opcode for a long time.
56 * The legacy cfree function has been removed. Applications should use the
57 free function instead.
59 * posix_spawnattr_setflags now supports POSIX_SPAWN_SETSID flag to create a
60 new session ID for the posix_spawn and posix_spawnp. It is scheduled to
61 be added on next major revision of POSIX, so current support is enabled
64 * The minimum Linux kernel version that this version of the GNU C Library
65 can be used with on i[4567]86 and x86_64 is 3.2. A Linux 3.2 or later
66 kernel was already required on all other architectures.
68 * The obsolete <sys/ultrasound.h> header file has been removed.
70 * The port to Native Client running on ARMv7-A (--host=arm-nacl) has been
73 * <string.h> no longer includes inline versions of any string functions,
74 as this kind of optimization is better done by the compiler. The macros
75 __USE_STRING_INLINES and __NO_STRING_INLINES no longer have any effect.
77 * The nonstandard header <xlocale.h> has been removed. Most programs should
78 use <locale.h> instead. If you have a specific need for the definition
79 of locale_t with no other declarations, please talk to us.
81 * The obsolete signal constant SIGUNUSED is no longer defined by <signal.h>.
83 * The reallocarray function has been added to libc. It is a realloc
84 replacement with a check for integer overflow when calculating total
87 * New preadv2 and pwritev2 has been added. They are Linux extensions to
88 preadv and pwritev with an additional flag argument where it is possible
89 to set high priority or use O_DSYNC or O_SYNC for a specific IO operation.
90 For complete support it requires Linux kernel version 4.6, otherwise a
91 compat implementation will be used (which refuses all flags and routes it
92 to preadv or pwritev).
94 * The stack_t type no longer has the name struct sigaltstack. This changes
95 the C++ name mangling for interfaces involving this type.
97 * The ucontext_t type no longer has the name struct ucontext. This changes
98 the C++ name mangling for interfaces involving this type.
100 * On M68k GNU/Linux and MIPS GNU/Linux, the fpregset_t type no longer has
101 the name struct fpregset. On Nios II GNU/Linux, the mcontext_t type no
102 longer has the name struct mcontext. On SPARC GNU/Linux, the struct
103 mc_fq, struct rwindow, struct fpq and struct fq types are no longer
104 defined in sys/ucontext.h, the mc_fpu_t type no longer has the name struct
105 mc_fpu, the gwindows_t type no longer has the name struct gwindows and the
106 fpregset_t type no longer has the name struct fpu. This changes the C++
107 name mangling for interfaces involving those types.
109 * The synchronization that pthread_spin_unlock performs has been changed
110 to now be equivalent to a C11 atomic store with release memory order to
111 the spin lock's memory location. This ensures correct synchronization
112 for the spin lock's operations and critical sections protected by a spin
113 lock. Previously, several (but not all) architectures used stronger
114 synchronization (e.g., containing what is often called a full barrier).
115 This change can improve performance, but may affect odd fringe uses of
116 spin locks that depend on the previous behavior (e.g., using spin locks
117 as atomic variables to try to implement Dekker's mutual exclusion
120 * The tunables feature is now enabled by default. This allows users to tweak
121 behavior of the GNU C Library using the GLIBC_TUNABLES environment variable.
123 * The s390 specific ptrace requests are adjusted to the kernel ones. Request 12
124 is now used for PTRACE_SINGLEBLOCK instead of PTRACE_GETREGS. The requests
125 PTRACE_GETREGS, PTRACE_SETREGS, PTRACE_GETFPREGS and PTRACE_SETFPREGS were
126 removed as those are not supported by the s390 kernel. The requests
127 PTRACE_SINGLEBLOCK, PTRACE_SECCOMP_GET_FILTER, PTRACE_PEEKUSR_AREA,
128 PTRACE_POKEUSR_AREA, PTRACE_GET_LAST_BREAK, PTRACE_ENABLE_TE,
129 PTRACE_DISABLE_TE and PTRACE_TE_ABORT_RAND were added as those are supported
132 * The minimum GCC version that can be used to build this version of the GNU
133 C Library is GCC 4.9. Older GCC versions, and non-GNU compilers, can
134 still be used to compile programs using the GNU C Library.
136 * The minimum GNU Binutils version that can be used to build this version of
137 the GNU C Library is Binutils 2.25.
139 * Support is added, on powerpc64le, x86_64, x86 and ia64, for interfaces
140 supporting the _Float128 type from ISO/IEC TS 18661-3:2015. Most of the
141 interfaces are taken from TS 18661-3. The type-generic macros in <math.h>
142 and <tgmath.h> support this type. The GNU C Library now requires GCC 6.2
143 or later to build for powerpc64le. When used with GCC versions before GCC
144 7, these interfaces may be used with the type under the non-standard name
147 New <stdlib.h> functions from ISO/IEC TS 18661-3:
149 - String Conversion Functions: strfromf128 and strtof128.
151 New <math.h> features from ISO/IEC TS 18661-3:
153 - Very Large Number macro: HUGE_VAL_F128.
155 - Signaling NaN macro: SNANF128.
157 - Trigonometric Functions: acosf128, asinf128, atanf128, atan2f128,
158 cosf128, sinf128, tanf128.
160 - Hyperbolic Functions: acoshf128, asinhf128, atanhf128, coshf128,
163 - Exponential and Logarithmic Functions: expf128, exp2f128, expm1f128,
164 frexpf128, ilogbf128, ldexpf128, llogbf128, logf128, log10f128,
165 log1pf128, log2f128, logbf128, modff128, scalbnf128, scalblnf128.
167 - Power and Absolute Functions: cbrtf128, fabsf128, hypotf128, powf128,
170 - Error and Gamma Functions: erff128, erfcf128, lgammaf128, tgammaf128.
172 - Nearest Integer Functions: ceilf128, floorf128, nearbyintf128,
173 rintf128, lrintf128, llrintf128, roundf128, lroundf128, llroundf128,
174 roundevenf128, truncf128, fromfpf128, ufromfpf128, fromfpxf128,
177 - Remainder Functions: fmodf128, remainderf128, remquof128.
179 - Manipulation Functions: copysignf128, nanf128, nextafterf128,
180 nextupf128, nextdownf128, canonicalizef128.
182 - Minimum, Maximum, and Positive Difference Functions: fdimf128,
183 fmaxf128, fminf128, fmaxmagf128, fminmagf128.
185 - Floating Multiply-Add Function: fmaf128.
187 - Total Order Functions: totalorderf128, totalordermagf128.
189 - Payload Functions: getpayloadf128, setpayloadf128, setpayloadsigf128.
191 New <complex.h> functions from ISO/IEC TS 18661-3:
193 - Trigonometric Functions: cacosf128, casinf128, catanf128, ccosf128,
196 - Hyperbolic Functions: cacoshf128, casinhf128, catanhf128, ccoshf128,
197 csinhf128, ctanhf128.
199 - Exponential and Logarithmic Functions: cexpf128, clogf128.
201 - Power and Absolute Functions: cabsf128, cpowf128, csqrtf128.
203 - Manipulation Functions: cargf128, cimagf128, CMPLXF128, conjf128,
204 cprojf128, crealf128.
206 The following <wchar.h> functions are added as GNU extensions:
208 - Wide String Conversion Functions: wsctof128, wcstof128_l.
210 The following <stdlib.h> function is added as a GNU extension:
212 - String Conversion Function: strtof128_l.
214 The following <math.h> features are added as GNU extensions:
216 - Predefined Mathematical Constants: M_Ef128, M_LOG2Ef128,
217 M_LOG10Ef128, M_LN2f128, M_LN10f128, M_PIf128, M_PI_2f128,
218 M_PI_4f128, M_1_PIf128, M_2_PIf128, M_2_SQRTPIf128, M_SQRT2f128,
221 - Trigonometric Function: sincosf128.
223 - Exponential and Logarithmic Function: exp10f128.
225 - Error and Gamma Function: lgammaf128_r.
227 - Bessel Functions: j0f128, j1f128, jnf128, y0f128, y1f128, ynf128.
229 The following <complex.h> function is added as a GNU extension:
231 - Exponential and Logarithmic Function: clog10f128.
233 * When the “rotate” (RES_ROTATE) DNS stub resolver option is active, glibc
234 will now randomly pick a name server from the configuration as a starting
235 point. (Previously, the second name server was always used.)
237 * The _res_opcodes variable has been removed from libresolv. It had been
238 exported by accident.
240 * The glibc DNS stub resolver now supports an arbitary number of search
241 domains (configured using the “search” directive in /etc/resolv.conf).
242 Most applications will automatically benefit from this change, but for
243 backwards compatibility reasons, applications which directly modify _res
244 objects (which contain the resolver state, including the search list
245 array, which is limited to six entries) will only use the first six search
248 * The glibc DNS stub resolver now automatically reloads /etc/resolv.conf,
249 to pick up changed configuration settings. The new “no-reload”
250 (RES_NORELOAD) resolver option disables this behavior.
252 Security related changes:
254 * The DNS stub resolver limits the advertised UDP buffer size to 1200 bytes,
255 to avoid fragmentation-based spoofing attacks.
257 The following bugs are resolved with this release:
259 [The release manager will add the list generated by
260 scripts/list-fixed-bugs.py just before the release.]
265 * The feature test macro __STDC_WANT_LIB_EXT2__, from ISO/IEC TR
266 24731-2:2010, is supported to enable declarations of functions from that
267 TR. Note that not all functions from that TR are supported by the GNU C
270 * The feature test macro __STDC_WANT_IEC_60559_BFP_EXT__, from ISO/IEC TS
271 18661-1:2014, is supported to enable declarations of functions and macros
272 from that TS. Note that not all features from that TS are supported by
275 * The feature test macro __STDC_WANT_IEC_60559_FUNCS_EXT__, from ISO/IEC TS
276 18661-4:2015, is supported to enable declarations of functions and macros
277 from that TS. Note that most features from that TS are not supported by
280 * The nonstandard feature selection macros _REENTRANT and _THREAD_SAFE are
281 now treated as compatibility synonyms for _POSIX_C_SOURCE=199506L.
282 Since the GNU C Library defaults to a much newer revision of POSIX, this
283 will only affect programs that specifically request an old conformance
284 mode. For instance, a program compiled with -std=c89 -D_REENTRANT will
285 see a change in the visible declarations, but a program compiled with
286 just -D_REENTRANT, or -std=c99 -D_POSIX_C_SOURCE=200809L -D_REENTRANT,
289 Some C libraries once required _REENTRANT and/or _THREAD_SAFE to be
290 defined by all multithreaded code, but glibc has not required this for
293 * The inclusion of <sys/sysmacros.h> by <sys/types.h> is deprecated. This
294 means that in a future release, the macros “major”, “minor”, and “makedev”
295 will only be available from <sys/sysmacros.h>.
297 These macros are not part of POSIX nor XSI, and their names frequently
298 collide with user code; see for instance glibc bug 19239 and Red Hat bug
299 130601. <stdlib.h> includes <sys/types.h> under _GNU_SOURCE, and C++ code
300 presently cannot avoid being compiled under _GNU_SOURCE, exacerbating the
303 * New <fenv.h> features from TS 18661-1:2014 are added to libm: the
304 fesetexcept, fetestexceptflag, fegetmode and fesetmode functions, the
305 femode_t type and the FE_DFL_MODE and FE_SNANS_ALWAYS_SIGNAL macros.
307 * Integer width macros from TS 18661-1:2014 are added to <limits.h>:
308 CHAR_WIDTH, SCHAR_WIDTH, UCHAR_WIDTH, SHRT_WIDTH, USHRT_WIDTH, INT_WIDTH,
309 UINT_WIDTH, LONG_WIDTH, ULONG_WIDTH, LLONG_WIDTH, ULLONG_WIDTH; and to
310 <stdint.h>: INT8_WIDTH, UINT8_WIDTH, INT16_WIDTH, UINT16_WIDTH,
311 INT32_WIDTH, UINT32_WIDTH, INT64_WIDTH, UINT64_WIDTH, INT_LEAST8_WIDTH,
312 UINT_LEAST8_WIDTH, INT_LEAST16_WIDTH, UINT_LEAST16_WIDTH,
313 INT_LEAST32_WIDTH, UINT_LEAST32_WIDTH, INT_LEAST64_WIDTH,
314 UINT_LEAST64_WIDTH, INT_FAST8_WIDTH, UINT_FAST8_WIDTH, INT_FAST16_WIDTH,
315 UINT_FAST16_WIDTH, INT_FAST32_WIDTH, UINT_FAST32_WIDTH, INT_FAST64_WIDTH,
316 UINT_FAST64_WIDTH, INTPTR_WIDTH, UINTPTR_WIDTH, INTMAX_WIDTH,
317 UINTMAX_WIDTH, PTRDIFF_WIDTH, SIG_ATOMIC_WIDTH, SIZE_WIDTH, WCHAR_WIDTH,
320 * New <math.h> features are added from TS 18661-1:2014:
322 - Signaling NaN macros: SNANF, SNAN, SNANL.
324 - Nearest integer functions: roundeven, roundevenf, roundevenl, fromfp,
325 fromfpf, fromfpl, ufromfp, ufromfpf, ufromfpl, fromfpx, fromfpxf,
326 fromfpxl, ufromfpx, ufromfpxf, ufromfpxl.
328 - llogb functions: the llogb, llogbf and llogbl functions, and the
329 FP_LLOGB0 and FP_LLOGBNAN macros.
331 - Max-min magnitude functions: fmaxmag, fmaxmagf, fmaxmagl, fminmag,
334 - Comparison macros: iseqsig.
336 - Classification macros: iscanonical, issubnormal, iszero.
338 - Total order functions: totalorder, totalorderf, totalorderl,
339 totalordermag, totalordermagf, totalordermagl.
341 - Canonicalize functions: canonicalize, canonicalizef, canonicalizel.
343 - NaN functions: getpayload, getpayloadf, getpayloadl, setpayload,
344 setpayloadf, setpayloadl, setpayloadsig, setpayloadsigf, setpayloadsigl.
346 * The functions strfromd, strfromf, and strfroml, from ISO/IEC TS 18661-1:2014,
347 are added to libc. They convert a floating-point number into string.
349 * Most of glibc can now be built with the stack smashing protector enabled.
350 It is recommended to build glibc with --enable-stack-protector=strong.
351 Implemented by Nick Alcock (Oracle).
353 * The function explicit_bzero, from OpenBSD, has been added to libc. It is
354 intended to be used instead of memset() to erase sensitive data after use;
355 the compiler will not optimize out calls to explicit_bzero even if they
356 are "unnecessary" (in the sense that no _correct_ program can observe the
357 effects of the memory clear).
359 * On ColdFire, MicroBlaze, Nios II and SH3, the float_t type is now defined
360 to float instead of double. This does not affect the ABI of any libraries
361 that are part of the GNU C Library, but may affect the ABI of other
362 libraries that use this type in their interfaces.
364 * On x86_64, when compiling with -mfpmath=387 or -mfpmath=sse+387, the
365 float_t and double_t types are now defined to long double instead of float
366 and double. These options are not the default, and this does not affect
367 the ABI of any libraries that are part of the GNU C Library, but it may
368 affect the ABI of other libraries that use this type in their interfaces,
369 if they are compiled or used with those options.
371 * The getentropy and getrandom functions, and the <sys/random.h> header file
374 * The buffer size for byte-oriented stdio streams is now limited to 8192
375 bytes by default. Previously, on Linux, the default buffer size on most
376 file systems was 4096 bytes (and thus remains unchanged), except on
377 network file systems, where the buffer size was unpredictable and could be
378 as large as several megabytes.
380 * The <sys/quota.h> header now includes the <linux/quota.h> header. Support
381 for the Linux quota interface which predates kernel version 2.4.22 has
384 * The malloc_get_state and malloc_set_state functions have been removed.
385 Already-existing binaries that dynamically link to these functions will
386 get a hidden implementation in which malloc_get_state is a stub. As far
387 as we know, these functions are used only by GNU Emacs and this change
388 will not adversely affect already-built Emacs executables. Any undumped
389 Emacs executables, which normally exist only during an Emacs build, should
390 be rebuilt by re-running “./configure; make” in the Emacs build tree.
392 * The “ip6-dotint” and “no-ip6-dotint” resolver options, and the
393 corresponding RES_NOIP6DOTINT flag from <resolv.h> have been removed.
394 “no-ip6-dotint” had already been the default, and support for the
395 “ip6-dotint” option was removed from the Internet in 2006.
397 * The "ip6-bytestring" resolver option and the corresponding RES_USEBSTRING
398 flag from <resolv.h> have been removed. The option relied on a
399 backwards-incompatible DNS extension which was never deployed on the
402 * The flags RES_AAONLY, RES_PRIMARY, RES_NOCHECKNAME, RES_KEEPTSIG,
403 RES_BLAST defined in the <resolv.h> header file have been deprecated.
404 They were already unimplemented.
406 * The "inet6" option in /etc/resolv.conf and the RES_USE_INET6 flag for
407 _res.flags are deprecated. The flag was standardized in RFC 2133, but
408 removed again from the IETF name lookup interface specification in RFC
409 2553. Applications should use getaddrinfo instead.
411 * DNSSEC-related declarations and definitions have been removed from the
412 <arpa/nameser.h> header file, and libresolv will no longer attempt to
413 decode the data part of DNSSEC record types. Previous versions of glibc
414 only implemented minimal support for the previous version of DNSSEC, which
415 is incompatible with the currently deployed version.
417 * The resource record type classification macros ns_t_qt_p, ns_t_mrr_p,
418 ns_t_rr_p, ns_t_udp_p, ns_t_xfr_p have been removed from the
419 <arpa/nameser.h> header file because the distinction between RR types and
420 meta-RR types is not officially standardized, subject to revision, and
421 thus not suitable for encoding in a macro.
423 * The types res_sendhookact, res_send_qhook, re_send_rhook, and the qhook
424 and rhook members of the res_state type in <resolv.h> have been removed.
425 The glibc stub resolver did not support these hooks, but the header file
426 did not reflect that.
428 * For multi-arch support it is recommended to use a GCC which has
429 been built with support for GNU indirect functions. This ensures
430 that correct debugging information is generated for functions
431 selected by IFUNC resolvers. This support can either be enabled by
432 configuring GCC with '--enable-gnu-indirect-function', or by
433 enabling it by default by setting 'default_gnu_indirect_function'
434 variable for a particular architecture in the GCC source file
437 * GDB pretty printers have been added for mutex and condition variable
438 structures in POSIX Threads. When installed and loaded in gdb these pretty
439 printers show various pthread variables in human-readable form when read
440 using the 'print' or 'display' commands in gdb.
442 * Tunables feature added to allow tweaking of the runtime for an application
443 program. This feature can be enabled with the '--enable-tunables' configure
444 flag. The GNU C Library manual has details on usage and README.tunables has
445 instructions on adding new tunables to the library.
447 * A new version of condition variables functions have been implemented in
448 the NPTL implementation of POSIX Threads to provide stronger ordering
451 * A new version of pthread_rwlock functions have been implemented to use a more
452 scalable algorithm primarily through not using a critical section anymore to
455 Security related changes:
457 * On ARM EABI (32-bit), generating a backtrace for execution contexts which
458 have been created with makecontext could fail to terminate due to a
459 missing .cantunwind annotation. This has been observed to lead to a hang
460 (denial of service) in some Go applications compiled with gccgo. Reported
461 by Andreas Schwab. (CVE-2016-6323)
463 * The DNS stub resolver functions would crash due to a NULL pointer
464 dereference when processing a query with a valid DNS question type which
465 was used internally in the implementation. The stub resolver now uses a
466 question type which is outside the range of valid question type values.
469 The following bugs are resolved with this release:
471 [4099] stdio: Overly agressive caching by stream i/o functions.
472 [7065] build: Support building glibc with -fstack-protector or -fstack-
474 [9842] localedata: en_CA: incorrect date format
475 [13165] nptl: pthread_cond_wait() can consume a signal that was sent
476 before it started waiting
477 [14139] manual: Do not hardcode platform names in manual/libm-err-tab.pl
478 [15765] nptl: sem_open is wrongly a cancellation point
479 [16421] network: IN6_IS_ADDR_UNSPECIFIED can use undefined s6_addr32
480 [16458] libc: endian.h and netinet/in.h byte order macros return values of
482 [16628] dynamic-link: Segfault after a binary without pthread dlopen()s a
483 library linked with pthread
484 [16630] nptl: Use SYSENTER for pthread_cond_broadcast/signal() (i.e. fix
486 [16907] libc: <argp.h> compiled with --std=cXX disables __attribute__
487 [17252] libc: getrandom and getentropy syscall
488 [17730] malloc: thread-local storage is sometimes improperly free()'d
489 after being __libc_memalign()'d
490 [18241] stdio: failed fseek on memstream does not set errno and can fail
492 [18243] nptl: sem_wait, sem_timedwait are cancellation points shm_open is
494 [18463] nptl: pthread_cond_broadcast issue when surrounded by
495 PTHREAD_PRIO_INHERIT mutex on ARM
496 [18784] network: res_query and related function crash for special record
497 type queries (CVE-2015-5180)
498 [19380] math: strtod does not raise "inexact"
499 [19387] string: Integer overflow in memchr
500 [19390] string: Integer overflow in strncat
501 [19398] build: linknamespace tests fail with massively parallel build
502 [19402] nptl: Deadlock with robust shared mutex and asynchronous
504 [19469] malloc: M_PERTURB in test-skeleton.c invalidates malloc tests
505 [19473] malloc: Turn malloc_get_state etc. in compatibility symbols
506 [19514] libc: [PATCH] Fix spelling errors in spelling
507 "implement"/"implementation" in several places
508 [19582] network: Deprecate RES_USE_INET6
509 [19673] manual: clog10 docs appear to be erroneous
510 [19810] dynamic-link: dlopen with both RTLD_NOLOAD and RTLD_NODELETE
511 causes a segmentation fault
512 [19826] libc: invalid pointer returned from __tls_get_addr with static
514 [20016] network: resolv: Remove hooks support from the API
515 [20019] dynamic-link: NULL pointer dereference in libc.so.6 IFUNC due to
517 [20033] math: [x86_64] vectorized math function don't call the __finite
519 [20116] nptl: use after free in pthread_create
520 [20181] stdio: open_memstream(): writes not at end of stream corrupt data
521 [20292] dynamic-link: Comparison in elf/dl-open.c _dl_addr_inside_object
523 [20311] nptl: please install proc_service.h
524 [20366] libc: Compilation errors in installed headers in strict-compliance
526 [20370] malloc: malloc: Arena free list management is still racy
527 (incorrect fix in bug 19243)
528 [20386] libc: assert (X = 0) does not result in GCC warning
529 [20432] malloc: malloc: Minimize interface required for interposition
530 [20435] libc: Missing unwind info in __startcontext causes infinite loop
531 in _Unwind_Backtrace (CVE-2016-6323)
532 [20444] hurd: recvmsg: PF_LOCAL sockets and msg_name lead to SIGLOST
533 [20452] nptl: Addition of sysdep.o to libpthread.a breaks relinking
535 [20455] math: [powerpc] fesetexceptflag fails to clear FE_INVALID
536 [20459] localedata: et_EE: locale has wrong {p,n}_cs_precedes value
537 [20477] network: resolv: incorrect double-checked locking related to
539 [20478] libc: libc_ifunc macro and similar usages leads to false debug-
541 [20495] math: x86_64 performance degradation due to AVX/SSE transition
543 [20497] localedata: lt_LT: LC_TIME d_fmt used is obsolete
544 [20508] dynamic-link: _dl_runtime_resolve_avx/_dl_runtime_profile_avx512
545 cause transition penalty
546 [20517] math: sparcv9 missing fdiml compat symbol
547 [20524] manual: strverscmp is inconsistent
548 [20525] libc: <sys/quota.h> should be based on kernel headers
549 [20539] math: GCC 7 -static -lm fails to link at -O3
550 [20554] libc: ld: bss-plt forced due to /usr/lib/libc_nonshared.a(ppc-
552 [20558] string: POSIX bcopy/bzero decls do not implement Object Size
554 [20591] network: Remove obsolete DNSSEC support
555 [20592] network: DNS resource record type classification macros in
556 <arpa/nameser.h> are incorrect
557 [20593] network: Update DNS RR type definitions
558 [20611] network: getaddrinfo accepts invalid numeric scope IDs
559 [20615] build: glibc build fails when using --with-cpu=power9 --enable-
561 [20629] network: libresolv: Remove support for bitstring labels
563 [20647] libc: GLIBC quitting every program - glibc on Pentium-S leads to
564 assertion: "maxidx >= 2"
565 [20660] math: [arm] Use VSQRT
566 [20662] libc: checking whether x86_64-pc-linux-gnu-gcc implicitly enables
567 -fstack-protector no (32bit gcc 6.2.0 pie and ssp enable)
568 [20689] libc: Test for FMA should also check for AVX.
569 [20707] glob: gl_pathv entries not set to NULL with GLOB_DOOFFS
570 [20715] math: iszero macro breaks existing code
571 [20718] math: [powerpc] copysignl raises "invalid" for sNaN
572 [20728] libc: powerpc: Missing TOC stub in clone
573 [20729] build: glibc-2.24 fails to build for i486 with -Os
574 [20750] build: Build fails with default PIE enabled gcc-6.x
575 [20768] math: [alpha] sqrt fegetenv namespace
576 [20785] libc: binutils 2.28 fails to assemble power6/memset.S file in
578 [20787] math: float_t is defined as float incorrectly on x86_64 even if
579 __FLT_EVAL_METHOD__ is 2
580 [20790] network: rpcgen buffer overrun in get_prog_declaration
581 [20822] nptl: race condition in __lll_unlock_elision on powerpc
582 [20829] libc: crypt snprintf namespace
583 [20847] libc: tst-vfork3 failure
584 [20855] math: Default bits/mathdef.h has inappropriate float_t
585 [20859] math: [sh4] FP_ILOGB0 invalid
586 [20864] localedata: iconv: cp936 missing single-byte euro sign (0x80,
587 U+20AC), not same as GBK
588 [20915] dynamic-link: global-dynamic TLS broken on aarch64
589 [20916] math: pow handling of sNaN arguments
590 [20918] build: Building with --enable-nss-crypt fails tst-linkall-static.
591 [20919] math: Bad pow (qNaN, 0) result with -lieee
592 [20940] math: hypot sNaN handling
593 [20947] math: fmax, fmin sNaN handling
594 [20956] libc: debug/tst-backtrace3-6 don't work with -O3 anymore
595 [20964] network: sunrpc: Stack-based buffer overflow in getrpcport with
597 [20971] string: powerpc64/power7 memchr overflows internal pointer check
598 [20973] nptl: robust mutexes: Lost wake-ups
599 [20974] locale: bs_BA: yesexpr/noexpr regexes accept any character
600 [20978] nis: strlen on null pointer in nss_nisplus
601 [20985] nptl: robust mutexes: lowlevelrobustlock assembly on x86 blocks on
603 [21014] string: i686 memchr overflows internal pointer check
604 [21019] libc: [mips] n32 lseek incorrect on overflow
605 [21022] libc: [microblaze] __backtrace get_frame_size namespace
606 [21026] libc: [MIPS] readahead syscall is broken on n64
607 [21028] math: Fallback fesetexceptflag should always succeed
608 [21045] libc: [powerpc-nofpu] swapcontext does not restore signal mask
609 [21047] math: arm: fpu_control.h: _FPU_GETCW/_FPU_SETCW is rejected by
611 [21053] libc: [SH] Namespace pollution from sys/ucontext.h
612 [21061] librt: [microblaze] librt lost clock_* exports
613 [21073] libc: tunables: insecure environment variables passed to
614 subprocesses with AT_SECURE
615 [21081] string: Missing vzeroupper in memset-vec-unaligned-erms.S
619 * The minimum Linux kernel version that this version of the GNU C Library
620 can be used with is 3.2, except on i[4567]86 and x86_64, where Linux
621 kernel version 2.6.32 or later suffices (on architectures that already
622 required kernel versions more recent than 3.2, those requirements remain
623 unchanged). Linux 3.2 or later kernel headers are required on all
626 * The pap_AN locale has been deleted. This has been deprecated for a long
627 time. It has been replaced by pap_AW & pap_CW, both of which have long
628 been included in previous releases.
630 * The readdir_r and readdir64_r functions have been deprecated. It is
631 recommended to use readdir and readdir64 instead.
633 * The type “union wait” has been removed. It was deprecated in the early
634 1990s and never part of POSIX. Application code should use the int type
635 instead of “union wait”.
637 * A new NSS action is added to facilitate large distributed system
638 administration. The action, MERGE, allows remote user stores like LDAP
639 to be merged into local user stores like /etc/groups in order to provide
640 easy to use, updated, and managed sets of merged credentials. The new
641 action can be used by configuring it in /etc/nsswitch.conf:
642 group: files [SUCCESS=merge] nis
643 Implemented by Stephen Gallagher (Red Hat).
645 * The deprecated __malloc_initialize_hook variable has been removed from the
648 * The long unused localedef --old-style option has been removed. It hasn't
649 done anything in over 16 years. Scripts using this option can safely
652 * nextupl, nextup, nextupf, nextdownl, nextdown and nextdownf are added to
653 libm. They are defined by TS 18661 and IEEE754-2008. The nextup functions
654 return the next representable value in the direction of positive infinity
655 and the nextdown functions return the next representable value in the
656 direction of negative infinity. These are currently enabled as GNU
659 Security related changes:
661 * An unnecessary stack copy in _nss_dns_getnetbyname_r was removed. It
662 could result in a stack overflow when getnetbyname was called with an
663 overly long name. (CVE-2016-3075)
665 * Previously, getaddrinfo copied large amounts of address data to the stack,
666 even after the fix for CVE-2013-4458 has been applied, potentially
667 resulting in a stack overflow. getaddrinfo now uses a heap allocation
668 instead. Reported by Michael Petlan. (CVE-2016-3706)
670 * The glob function suffered from a stack-based buffer overflow when it was
671 called with the GLOB_ALTDIRFUNC flag and encountered a long file name.
672 Reported by Alexander Cherepanov. (CVE-2016-1234)
674 * The Sun RPC UDP client could exhaust all available stack space when
675 flooded with crafted ICMP and UDP messages. Reported by Aldy Hernandez'
676 alloca plugin for GCC. (CVE-2016-4429)
678 * The IPv6 name server management code in libresolv could result in a memory
679 leak for each thread which is created, performs a failing naming lookup,
680 and exits. Over time, this could result in a denial of service due to
681 memory exhaustion. Reported by Matthias Schiffer. (CVE-2016-5417)
683 The following bugs are resolved with this release:
685 [1170] localedata: ne_NP: update Nepali locale definition file
686 [3629] manual: stpcpy description in string.texi refers to MS-DOG instead
688 [6527] malloc: [powerpc] Malloc alignment insufficient for PowerPC
689 [6796] math: fdim() does not set errno on overflow
690 [10354] libc: posix_spawn should use vfork() in more cases than presently
691 [11213] localedata: localedata: add copyright disclaimer to locale files
692 [12143] localedata: chr_US: new Cherokee locale
693 [12450] localedata: sgs_LT: new locale
694 [12676] localedata: ln_CD: new locale
695 [13237] localedata: LC_ADDRESS.country_name: update all locales w/latest
697 [13304] math: fma, fmaf, fmal produce wrong results
698 [14259] build: --localedir arg to configure is ignored
699 [14499] nptl: Does posix_spawn invoke atfork handlers / use vfork?
700 [14750] libc: Race condition in posix_spawn vfork usage vs signal handlers
701 [14934] localedata: es_CL: wrong first weekday chilean locale
702 [15262] localedata: LC_MESSAGES.yesexpr/noexpr: inconsistent use of
704 [15263] localedata: LC_MESSAGES.yesexpr/noexpr: inconsistent use of 1/0
706 [15264] localedata: LC_MESSAGES.yesstr/nostr: lacking in many locales
707 [15368] nptl: raise() is not async-signal-safe
708 [15479] math: ceil, floor, round and trunc raise inexact exception
709 [15578] localedata: kk_KZ: various updates
710 [16003] localedata: pap_AN: punt old locale
711 [16137] localedata: iw_IL: punt old locale
712 [16190] localedata: eo: new esperanto locale
713 [16374] localedata: lv_LV: change currency symbol in LC_MONETARY to euro
714 [16742] malloc: race condition: pthread_atfork() called before first
715 malloc() results in unexpected locking behaviour/deadlocks
716 [16975] localedata: LC_MESSAGES.yesexpr/noexpr: revisit capitalization in
718 [16983] localedata: postal_fmt does not allow %l and %n modifiers
719 [17565] localedata: pt_PT: wrong (work-)week start
720 [17899] math: [powerpc] floorl returns negative zero with FE_DOWNWARD
721 [17950] build: Build fails with -msse
722 [18205] localedata: be_BY*: wrong first_weekday and first_workday
723 [18433] libc: posix_spawn does not return correctly upon failure to
725 [18453] localedata: charmaps/IBM875: incorrect codes
726 [18712] string: bits/string2.h incompatible with -O2 -Werror=packed
728 [18896] localedata: he_IL: improvements for currency
729 [18911] localedata: ro_RO: Correcting week day name for "Tuesday" in
731 [18960] locale: s390: _nl_locale_subfreeres uses larl opcode on misaligned
733 [19056] libc: Deprecate readdir_r
734 [19133] localedata: pt_*: days & months should be lowercase in Portuguese
736 [19198] localedata: nl_NL: small improvements for Dutch locales
737 [19257] network: Per-thread memory leak in __res_vinit with IPv6
738 nameservers (CVE-2016-5417)
739 [19269] build: tst-audit4 and tst-audit10 failures with gcc-6 on non avx
741 [19400] locale: Language missing in "iso-639.def", trivial fix in
743 [19431] malloc: Deadlock between fflush, getdelim, and fork
744 [19505] libc: Incorrect file descriptor validity checks in
745 posix_spawn_file_actions_add{open,close,dup2}
746 [19509] dynamic-link: dlsym, dlvsym do not report errors through dlerror
748 [19512] locale: Stale `#ifndef HAVE_BUILTIN_EXPECT' in
749 `intl/{gettextP,loadinfo}.h'
750 [19534] libc: execle, execlp may use malloc
751 [19568] localedata: *_CH: Swiss locales have inconsistent start of week
752 [19573] network: res_nclose and __res_maybe_init disagree about name
753 server initialization, breaking Hesiod
754 [19575] localedata: Status of GB18030 tables
755 [19581] localedata: sr_* date_fmt string contains additional newline
756 [19583] string: SSSE3_Fast_Copy_Backward flag needs to be enabled for AMD
758 [19592] math: [ldbl-128ibm] ceill incorrect in non-default rounding modes
759 [19593] math: [ldbl-128ibm] truncl incorrect in non-default rounding modes
760 [19594] math: [ldbl-128ibm] roundl incorrect in non-default rounding modes
761 [19595] math: [ldbl-128ibm] fmodl incorrect for results in subnormal
763 [19602] math: [ldbl-128ibm] fmodl handling of equal arguments with low
765 [19603] math: [ldbl-128ibm] remainderl, remquol incorrect sign handling in
767 [19610] dynamic-link: ldconfig -X removes stale symbolic links
768 [19613] libc: s390x (64 bit) macro expansion WCOREDUMP and others
769 [19633] locale: strfmon_l applies global locale to number formatting
770 [19642] network: Memory leak in getnameinfo
771 [19648] libc: test-skeleton.c: Do not set RLIMIT_DATA
772 [19653] libc: Potential for NULL pointer dereference (CWE-476) in
774 [19654] math: [x86_64] Need testcase for BZ #19590 fix
775 [19671] localedata: Missing Sanity Check for malloc() in 'tst-fmon.c' &
777 [19674] math: [ldbl-128ibm] powl incorrect overflow handling
778 [19677] math: [ldbl-128ibm] remainderl equality test incorrect for zero
780 [19678] math: [ldbl-128ibm] nextafterl, nexttowardl incorrect sign of zero
782 [19679] dynamic-link: gcc-4.9.3 C++ exception handling broken due to
784 [19726] locale: Converting UCS4LE to INTERNAL with iconv() does not update
785 pointers and lengths in error-case.
786 [19727] locale: Converting from/to UTF-xx with iconv() does not always
787 report errors on UTF-16 surrogates values.
788 [19755] nscd: nscd assertion failure in gc
789 [19758] dynamic-link: Typo in EXTRA_LD_ENVVARS for x86-64
790 [19759] libc: mempcpy shouldn't be inlined
791 [19762] dynamic-link: HAS_CPU_FEATURE/HAS_ARCH_FEATURE are easy to misuse
792 [19765] libc: s390 needs an optimized mempcpy
793 [19779] glob: glob: buffer overflow with GLOB_ALTDIRFUNC due to incorrect
794 NAME_MAX limit assumption (CVE-2016-1234)
795 [19783] build: benchtests don't support --enable-hardcoded-path-in-tests
796 [19787] network: Missing and incorrect truncation checks in getnameinfo
797 [19790] math: [ldbl-128ibm] nearbyintl incorrect in non-default rounding
799 [19791] network: Assertion failure in res_query.c with un-connectable name
801 [19792] libc: MIPS: backtrace yields infinite backtrace with makecontext
802 [19822] math: libm.so install clobbers old version
803 [19825] network: resolv: send_vc can return uninitialized data in second
804 response to getaddrinfo
805 [19830] network: nss_dns: should check RDATA length against buffer length
806 [19831] network: nss_dns: getaddrinfo returns uninitialized data when
807 confronted with A/AAAA records of invalid size
808 [19837] nss: nss_db: No retries for some long lines with a larger buffer
809 [19848] math: powl(10,n) for n=-4,-5,-6,-7 is off by more than 1 ULP
810 [19853] stdio: Printing IBM long double in decimal with high precision is
812 [19860] build: x86_64: compile errors for tst-audit10 and tst-auditmod10b
813 [19861] nptl: libpthread IFUNC resolver for fork can lead to crash
814 [19862] network: resolv, nss_dns: Remove remaining logging of unexpected
816 [19865] network: Assertion failure or memory leak in
817 _nss_dns_getcanonname_r
818 [19868] network: nss_dns: netent code does not skip over non-PTR records
819 [19879] network: nss_dns: Stack overflow in getnetbyname implementation
821 [19881] string: Improve x86-64 memset
822 [19907] string: Incorrect memcpy tests
823 [19916] dynamic-link: S390: fprs/vrs are not saved/restored while
825 [19925] libc: termios.h XCASE namespace
826 [19928] string: memmove-vec-unaligned-erms.S is slow with large data size
827 [19929] libc: limits.h NL_NMAX namespace
828 [19931] stdio: Memory leak in vfprintf
829 [19957] libc: clone(CLONE_VM) access invalid parent memory
830 [19963] localedata: en_IL: New locale
831 [19989] stdio: stdio.h cuserid namespace
832 [19994] network: getaddrinfo does not restore RES_USE_INET6 flag in
834 [19996] locale: langinfo.h nl_langinfo_l namespace
835 [20005] stdio: fflush on a file opened with fmemopen resets position to 0
836 [20010] network: getaddrinfo: Stack overflow in hostent translation
838 [20012] stdio: libio: fmemopen append mode failure
839 [20014] stdio: stdio.h namespace for pre-threads POSIX
840 [20017] network: resolv: Use gmtime_r instead of gmtime in p_secstodate
841 [20023] libc: fcntl.h timespec namespace
842 [20024] math: [x86_64] vectorized sincos trashes the stack
843 [20031] network: nss_hesiod: Heap overflow in get_txt_records
844 [20041] time: sys/time.h timespec namespace
845 [20043] libc: unistd.h missing cuserid for UNIX98 and before
846 [20044] libc: unistd.h missing pthread_atfork for UNIX98
847 [20051] libc: ttyslot in wrong header under wrong conditions
848 [20054] libc: gethostname not declared for XPG4
849 [20055] libc: termios.h missing tcgetsid for XPG4
850 [20072] dynamic-link: x86 init_cpu_features is called twice in static
852 [20073] libc: sys/stat.h fchmod namespace
853 [20074] libc: stdlib.h rand_r namespace
854 [20076] libc: sys/stat.h missing S_IFSOCK, S_ISSOCK for XPG4
855 [20094] libc: stdlib.h should not declare grantpt, ptsname, unlockpt for
857 [20111] libc: struct sockaddr_storage cannot be aggregate-copied
858 [20112] network: sunrpc: stack (frame) overflow in Sun RPC clntudp_call
860 [20115] string: Extra alignment in memset-vec-unaligned-erms.S
861 [20119] libc: Wrong mask for processors level type from CPUID
862 [20139] dynamic-link: Upper part of zmm is zeroed if Glibc is built with
863 AS not supporting AVX512
864 [20151] math: [ldbl-128/ldbl-128ibm] j0l, j1l, y0l, y1l return sNaN for
866 [20153] math: [ldbl-128ibm] sqrtl (sNaN) returns sNaN
867 [20156] math: [ldbl-128ibm] ceill, rintl etc. return sNaN for sNaN
869 [20157] math: [powerpc] fabsl (sNaN) wrongly raises "invalid"
870 [20160] math: [powerpc] ceil, rint etc. return sNaN for sNaN input
871 [20178] libc: posix_spawn{p} should not call exit
872 [20191] stdio: libio: vtables hardening
873 [20195] string: FMA4 detection requires CPUID execution with register
875 [20198] libc: quick_exit incorrectly destroys C++11 thread objects.
876 [20205] math: [i386/x86_64] nextafterl incorrect incrementing negative
878 [20212] math: acos (sNaN) returns sNaN
879 [20213] math: asin (sNaN) returns sNaN
880 [20214] network: Linux header sync with linux/in6.h and ipv6.h again.
881 [20218] math: [i386] asinhl (sNaN) returns sNaN
882 [20219] math: [i386] atanhl (sNaN) returns sNaN
883 [20222] stdio: fopencookie: Mangle function pointers
884 [20224] math: [i386] cbrtl (sNaN) returns sNaN
885 [20225] math: ldexp, scalbn, scalbln return sNaN for sNaN input
886 [20226] math: [i386/x86_64] expl, exp10l, expm1l return sNaN for sNaN
888 [20227] math: [i386/x86_64] logl (sNaN) returns sNaN
889 [20228] math: [i386/x86_64] log10l (sNaN) returns sNaN
890 [20229] math: [i386/x86_64] log1pl (sNaN) returns sNaN
891 [20232] math: [ldbl-128] expm1l (sNaN) returns sNaN
892 [20233] math: [ldbl-128ibm] expm1l (sNaN) returns sNaN
893 [20234] math: [ldbl-128ibm] log1pl (sNaN) returns sNaN
894 [20235] math: [i386/x86_64] log2l (sNaN) returns sNaN
895 [20237] nss: nss_db: get*ent segfaults without preceding set*ent
896 [20240] math: modf (sNaN) returns sNaN
897 [20248] libc: debug/tst-longjump_chk2 calls printf from a signal handler
898 [20250] math: frexp (sNaN) returns sNaN
899 [20252] math: atan2 (sNaN, qNaN) fails to raise "invalid"
900 [20255] math: [i386] fdim, fdimf return with excess range and precision /
902 [20256] math: [i386/x86_64] fdiml returns sNaN for sNaN input
903 [20260] string: ../sysdeps/x86/bits/string.h:1092:3: error: array
904 subscript is below array bounds [-Werror=array-bounds]
905 [20262] nis: _nss_nis_initgroups_dyn always returns NSS_STATUS_NOTFOUND
906 [20263] nptl: robust mutex deadlocks if other thread requests timedlock
908 [20277] libc: $dp is not initialized correctly in sysdeps/hppa/start.S
909 [20284] malloc: malloc: Corrupt arena avoidance causes unnecessary mmap
911 [20296] math: [i386/x86_64] scalbl returns sNaN for sNaN input, missing
913 [20314] nptl: make[4]: *** [/usr/include/stdlib.h] Error 1
914 [20316] localedata: id_ID: Februari instead of Pebruari
915 [20327] string: POWER8 strcasecmp returns incorrect result
916 [20347] math: Failure: Test: j0_downward (0xap+0)
917 [20348] libc: FAIL: misc/tst-preadvwritev64
918 [20349] libc: 64-bit value is passed differently in p{readv,writev}{64}
919 [20350] libc: There is no test for p{read,write}64
920 [20357] math: Incorrect cos result for 1.5174239687223976
921 [20384] build: Don't run libmvec-sincos-avx* tests on non avx machines
925 * Unicode 8.0.0 Support: Character encoding, character type info, and
926 transliteration tables are all updated to Unicode 8.0.0, using new
927 and/or improved generator scripts contributed by Mike FABIAN (Red Hat).
928 These updates cause user visible changes, such as the fixes for bugs
929 89, 16061, and 18568.
931 * sched_setaffinity, pthread_setaffinity_np no longer attempt to guess the
932 kernel-internal CPU set size. This means that requests that change the
933 CPU affinity which failed before (for example, an all-ones CPU mask) will
934 now succeed. Applications that need to determine the effective CPU
935 affinities need to call sched_getaffinity or pthread_getaffinity_np after
936 setting it because the kernel can adjust it (and the previous size check
937 would not detect this in the majority of cases).
939 * The fts.h header can now be used with -D_FILE_OFFSET_BITS=64. With LFS
940 the following new symbols are used: fts64_children, fts64_close,
941 fts64_open, fts64_read and fts64_set.
943 * getaddrinfo now detects certain invalid responses on an internal netlink
944 socket. If such responses are received, an affected process will
945 terminate with an error message of "Unexpected error <number> on netlink
946 descriptor <number>" or "Unexpected netlink response of size <number> on
947 descriptor <number>". The most likely cause for these errors is a
948 multi-threaded application which erroneously closes and reuses the netlink
949 file descriptor while it is used by getaddrinfo.
951 * A defect in the malloc implementation, present since glibc 2.15 (2012) or
952 glibc 2.10 via --enable-experimental-malloc (2009), could result in the
953 unnecessary serialization of memory allocation requests across threads.
954 The defect is now corrected. Users should see a substantial increase in
955 the concurent throughput of allocation requests for applications which
956 trigger this bug. Affected applications typically create and
957 destroy threads frequently. (Bug 19048 was reported and analyzed by
960 * There is now a --disable-timezone-tools configure option for disabling the
961 building and installing of the timezone related utilities (zic, zdump, and
962 tzselect). This is useful for people who build the timezone data and code
963 independent of the GNU C Library.
965 * The obsolete header <regexp.h> has been removed. Programs that require
966 this header must be updated to use <regex.h> instead.
968 * The obsolete functions bdflush, create_module, get_kernel_syms,
969 query_module and uselib are no longer available to newly linked binaries;
970 the header <sys/kdaemon.h> has been removed. These functions and header
971 were specific to systems using the Linux kernel and could not usefully be
972 used with the GNU C Library on systems with version 2.6 or later of the
975 * Optimized string, wcsmbs and memory functions for IBM z13.
976 Implemented by Stefan Liebler.
978 * Newly linked programs that define a variable called signgam will no longer
979 have it set by the lgamma, lgammaf and lgammal functions. Programs that
980 require signgam to be set by those functions must ensure that they use the
981 variable provided by the GNU C Library and declared in <math.h>, without
982 defining their own copy.
984 * The minimum GCC version that can be used to build this version of the GNU
985 C Library is GCC 4.7. Older GCC versions, and non-GNU compilers, can
986 still be used to compile programs using the GNU C Library.
988 Security related changes:
990 * An out-of-bounds value in a broken-out struct tm argument to strftime no
991 longer causes a crash. Reported by Adam Nielsen. (CVE-2015-8776)
993 * The LD_POINTER_GUARD environment variable can no longer be used to disable
994 the pointer guard feature. It is always enabled. Previously,
995 LD_POINTER_GUARD could be used to disable security hardening in binaries
996 running in privileged AT_SECURE mode. Reported by Hector Marco-Gisbert.
999 * An integer overflow in hcreate and hcreate_r could lead to an
1000 out-of-bounds memory access. Reported by Szabolcs Nagy. (CVE-2015-8778)
1002 * The catopen function no longer has unbounded stack usage. Reported by
1003 Max. (CVE-2015-8779)
1005 * The nan, nanf and nanl functions no longer have unbounded stack usage
1006 depending on the length of the string passed as an argument to the
1007 functions. Reported by Joseph Myers. (CVE-2014-9761)
1009 * A stack-based buffer overflow was found in libresolv when invoked from
1010 libnss_dns, allowing specially crafted DNS responses to seize control
1011 of execution flow in the DNS client. The buffer overflow occurs in
1012 the functions send_dg (send datagram) and send_vc (send TCP) for the
1013 NSS module libnss_dns.so.2 when calling getaddrinfo with AF_UNSPEC
1014 family. The use of AF_UNSPEC triggers the low-level resolver code to
1015 send out two parallel queries for A and AAAA. A mismanagement of the
1016 buffers used for those queries could result in the response of a query
1017 writing beyond the alloca allocated buffer created by
1018 _nss_dns_gethostbyname4_r. Buffer management is simplified to remove
1019 the overflow. Thanks to the Google Security Team and Red Hat for
1020 reporting the security impact of this issue, and Robert Holiday of
1021 Ciena for reporting the related bug 18665. (CVE-2015-7547)
1023 The following bugs are resolved with this release:
1025 [89] localedata: Locales nb_NO and nn_NO should transliterate æøå
1026 [887] math: Math library function "logb" and "nextafter" inconsistent
1027 [2542] math: Incorrect return from float gamma (-0X1.FA471547C2FE5P+1)
1028 [2543] math: Incorrect return from float gamma (-0X1.9260DCP+1)
1029 [2558] math: Incorrect return from double gamma (-0X1.FA471547C2FE5P+1)
1030 [2898] libc: [improve] warning: the use of `mktemp' is dangerous, better
1032 [4404] localedata: German translation of "Alarm clock" is misleading
1033 [6799] math: nextafter() and nexttoward() doen't set errno on
1034 overflow/underflow errors
1035 [6803] math: scalb(), scalbln(), scalbn() do not set errno on
1037 [10432] nis: _nss_nis_setnetgrent assertion failure
1038 [11460] libc: fts has no LFS support
1039 [12926] network: getaddrinfo()/make_request() may spin forever
1040 [13065] nptl: Race condition in pthread barriers
1041 [13690] nptl: pthread_mutex_unlock potentially cause invalid access
1042 [14341] dynamic-link: Dynamic linker crash when DT_JMPREL and DT_REL{,A}
1044 [14551] math: [ldbl-128ibm] strtold overflow handling for IBM long double
1045 [14912] libc: Rename non-installed bits/*.h headers
1046 [15002] libc: Avoid undefined behavior in posix_fallocate overflow check
1047 [15367] math: Let gcc use __builtin_isinf
1048 [15384] math: One constant fewer in ieee754/dbl-64/wordsize-64/s_finite.c
1049 [15421] math: lgamma wrongly sets signgam for ISO C
1050 [15470] math: [arm] On ARM llrintl() and llroundl() do not raise
1051 FE_INVALID with argument out of range
1052 [15491] math: [i386/x86_64] x86 nearbyint implementations wrongly clear
1054 [15786] dynamic-link: ifunc resolver functions can smash function
1056 [15918] math: Unnecessary check for equality in hypotf()
1057 [16061] localedata: Review / update transliteration data
1058 [16068] math: [i386/x86_64] x86 and x86_64 fesetenv exclude state they
1060 [16141] time: strptime %z offset restriction
1061 [16171] math: drem should be alias of remainder
1062 [16296] math: fegetround is pure?
1063 [16347] math: [ldbl-128ibm] ldbl-128/e_lgammal_r.c may not be suitable.
1064 [16364] libc: sleep may leave SIGCHLD blocked on sync cancellation on
1066 [16399] math: [mips] lrint / llrint / lround / llround missing exceptions
1067 [16415] math: Clean up ldbl-128 / ldbl-128ibm expm1l for large positive
1069 [16422] math: [powerpc] math-float, math-double failing llrint tests with
1070 "Exception "Inexact" set" on ppc32
1071 [16495] localedata: nl_NL: date_fmt: shuffle year/month around
1072 [16517] math: Missing underflow exception from tanf/tan/tanl
1073 [16519] math: Missing underflow exception from sinhf
1074 [16520] math: Missing underflow exception from tanhf
1075 [16521] math: Missing underflow exception from exp2
1076 [16620] math: [ldbl-128ibm] exp10l spurious overflows / bad directed
1078 [16734] stdio: fopen calls mmap to allocate its buffer
1079 [16961] math: nan function incorrect handling of bad sequences
1080 [16962] math: nan function unbounded stack allocation (CVE-2014-9761)
1081 [16973] localedata: Fix lang_lib/lang_term as per ISO 639-2
1082 [16985] locale: localedef: confusing error message when opening output
1084 [17118] math: ctanh(INFINITY + 2 * I) returns incorrect value
1085 [17197] locale: Redundant shift character in iconv conversion output at
1087 [17243] libc: trunk/posix/execl.c:53: va_args problem ?
1088 [17244] libc: trunk/sysdeps/unix/sysv/linux/semctl.c:116: va_args muxup ?
1089 [17250] dynamic-link: static linking breaks nss loading
1090 (getaddrinfo/getpwnam/etc...)
1091 [17404] libc: atomic_exchange_rel lacking a barrier on MIPS16, GCC before
1093 [17441] math: isnan() should use __builtin_isnan() in GCC
1094 [17514] nptl: Assert failure unlocking ERRORCHECK mutex after timedlock
1095 (related to lock elision)
1096 [17787] manual: Exponent on page 324 of the PDF ends prematurely
1097 [17886] time: strptime should be able to parse "Z" as a timezone with %z
1098 [17887] time: strptime should be able to parse "+01:00" style timezones
1099 [17905] libc: catopen() Multiple unbounded stack allocations
1101 [18084] libc: backtrace (..., 0) dumps core on x86
1102 [18086] libc: nice() sets errno to 0 on success
1103 [18240] libc: hcreate, hcreate_r should fail with ENOMEM if element count
1104 is too large (CVE-2015-8778)
1105 [18251] dynamic-link: SONAME missing when audit modules provides path
1106 [18265] libc: add attributes for wchar string and memory functions
1107 [18370] math: csqrt missing underflows
1108 [18421] libc: [hppa] read-only segment has dynamic relocations
1109 [18472] libc: Obsolete syscall wrappers should be compat symbols
1110 [18480] libc: hppa glibc miscompilation in sched_setaffinity()
1111 [18491] localedata: Update tr_TR LC_CTYPE as part of Unicode updates
1112 [18525] localedata: Remove locale timezone information
1113 [18560] libc: [powerpc] spurious bits/ipc.h definitions
1114 [18568] localedata: Update locale data to Unicode 8.0
1115 [18589] locale: sort-test.sh fails at random
1116 [18595] math: ctan, ctanh missing underflows
1117 [18604] libc: assert macro-expands its argument
1118 [18610] math: S390: fetestexcept() reports any exception if DXC-code
1119 contains a vector instruction exception.
1120 [18611] math: j1, jn missing errno setting on underflow
1121 [18618] localedata: sync Chechen locale definitions with other *_RU
1123 [18647] math: powf(-0x1.000002p0, 0x1p30) returns 0 instead of +inf
1124 [18661] libc: Some x86-64 assembly codes don't align stack to 16 bytes
1125 [18665] network: In send_dg, the recvfrom function is NOT always using the
1126 buffer size of a newly created buffer (CVE-2015-7547)
1127 [18674] libc: [i386] trunk/sysdeps/i386/tst-auditmod3b.c:84: possible
1129 [18675] libc: fpathconf(_PC_NAME_MAX) fails against large filesystems for
1131 [18681] libc: regexp.h is obsolete and buggy, and should be desupported
1132 [18699] math: tilegx cproj() for various complex infinities does not yield
1134 [18724] libc: Harden put*ent functions against data injection
1135 [18743] nptl: PowerPC: findutils testcase fails with --enable-lock-elision
1136 [18755] build: build errors with -DNDEBUG
1137 [18757] stdio: fmemopen fails to set errno on failure
1138 [18778] dynamic-link: ld.so crashes if failed dlopen causes libpthread to
1140 [18781] libc: openat64 lacks O_LARGEFILE
1141 [18787] libc: [hppa] sysdeps/unix/sysv/linux/hppa/bits/atomic.h:71:6:
1142 error: can’t find a register in class ‘R1_REGS’ while reloading ‘asm’
1143 [18789] math: [ldbl-128ibm] sinhl inaccurate near 0
1144 [18790] math: [ldbl-128ibm] tanhl inaccurate
1145 [18795] libc: stpncpy fortification misses buffer lengths that are
1146 statically too large
1147 [18796] build: build fails for --disable-mathvec
1148 [18803] math: hypot missing underflows
1149 [18820] stdio: fmemopen may leak memory on failure
1150 [18823] math: csqrt spurious underflows
1151 [18824] math: fma spurious underflows
1152 [18825] math: pow missing underflows
1153 [18857] math: [ldbl-128ibm] nearbyintl wrongly uses signaling comparisons
1154 [18868] nptl: pthread_barrier_init typo has in-theory-undefined behavior
1155 [18870] build: sem_open.c fails to compile with missing symbol
1157 [18872] stdio: Fix memory leak in printf_positional
1158 [18873] libc: posix_fallocate overflow check ineffective
1159 [18875] math: Excess precision leads incorrect libm
1160 [18877] libc: arm: mmap offset regression
1161 [18887] libc: memory corruption when using getmntent on blank lines
1162 [18918] localedata: hu_HU: change time to HH:MM:SS format
1163 [18921] libc: Regression: extraneous stat() and fstat() performed by
1165 [18928] dynamic-link: LD_POINTER_GUARD is not ignored for privileged
1166 binaries (CVE-2015-8777)
1167 [18951] math: tgamma missing underflows
1168 [18952] math: [ldbl-128/ldbl-128ibm] lgammal spurious "invalid", incorrect
1170 [18953] localedata: lt_LT: change currency symbol to the euro
1171 [18956] math: powf inaccuracy
1172 [18961] math: [i386] exp missing underflows
1173 [18966] math: [i386] exp10 missing underflows
1174 [18967] math: math.h XSI POSIX namespace (gamma, isnan, scalb)
1175 [18969] build: multiple string test failures due to missing locale
1177 [18970] libc: Reference of pthread_setcancelstate in libc.a
1178 [18977] math: float / long double Bessel functions not in XSI POSIX
1179 [18980] math: i386 libm functions return with excess range and precision
1180 [18981] math: i386 scalb*, ldexp return with excess range and precision
1181 [18982] stdio: va_list and vprintf
1182 [18985] time: Passing out of range data to strftime() causes a segfault
1184 [19003] math: [x86_64] fma4 version of pow inappropriate contraction
1185 [19007] libc: FAIL: elf/check-localplt with -z now and binutils 2.26
1186 [19012] locale: iconv_open leaks memory on error path
1187 [19016] math: clog, clog10 inaccuracy
1188 [19018] nptl: Mangle function pointers in tls_dtor_list
1189 [19032] math: [i386] acosh (-qNaN) spurious "invalid" exception
1190 [19046] math: ldbl-128 / ldbl-128ibm lgamma bad overflow handling
1191 [19048] malloc: malloc: arena free list can become cyclic, increasing
1193 [19049] math: [powerpc] erfc incorrect zero sign
1194 [19050] math: [powerpc] log* incorrect zero sign
1195 [19058] math: [x86_64] Link fail with -fopenmp and -flto
1196 [19059] math: nexttoward overflow incorrect in non-default rounding modes
1197 [19071] math: ldbl-96 lroundl incorrect just below powers of 2
1198 [19074] network: Data race in _res_hconf_reorder_addrs
1199 [19076] math: [ldbl-128ibm] log1pl (-1) wrong sign of infinity
1200 [19077] math: [ldbl-128ibm] logl (1) incorrect sign of zero result
1201 [19078] math: [ldbl-128ibm] expl overflow incorrect in non-default
1203 [19079] math: dbl-64/wordsize-64 lround based on llround incorrect for
1205 [19085] math: ldbl-128 lrintl, lroundl missing exceptions for 32-bit long
1206 [19086] manual: posix_fallocate64 documented argument order is wrong.
1207 [19088] math: lround, llround missing exceptions close to overflow
1209 [19094] math: lrint, llrint missing exceptions close to overflow threshold
1210 [19095] math: dbl-64 lrint incorrect for 64-bit long
1211 [19122] dynamic-link: Unnecessary PLT relocations in librtld.os
1212 [19124] dynamic-link: ld.so failed to build with older assmebler
1213 [19125] math: [powerpc32] llroundf, llround incorrect exceptions
1214 [19129] dynamic-link: [arm] Concurrent lazy TLSDESC resolution can crash
1215 [19134] math: [powerpc32] lround, lroundf spurious exceptions
1216 [19137] libc: i386/epoll_pwait.S doesn't support cancellation
1217 [19143] nptl: Remove CPU set size checking from sched_setaffinity,
1218 pthread_setaffinity_np
1219 [19156] math: [ldbl-128] j0l spurious underflows
1220 [19164] nptl: tst-getcpu fails with many possible CPUs
1221 [19168] math: math/test-ildoubl and math/test-ldouble failure
1222 [19174] nptl: PowerPC: TLE enabled pthread mutex performs poorly.
1223 [19178] dynamic-link: ELF_RTYPE_CLASS_EXTERN_PROTECTED_DATA confuses
1225 [19181] math: [i386/x86_64] fesetenv (FE_DFL_ENV), fesetenv
1226 (FE_NOMASK_ENV) do not clear SSE exceptions
1227 [19182] malloc: malloc deadlock between ptmalloc_lock_all and
1228 _int_new_arena/reused_arena
1229 [19189] math: [ldbl-128] log1pl (-qNaN) spurious "invalid" exception
1230 [19201] math: dbl-64 remainder incorrect sign of zero result
1231 [19205] math: bits/math-finite.h conditions do not match math.h and
1233 [19209] math: bits/math-finite.h wrongly maps ldexp to scalbn
1234 [19211] math: lgamma functions do not set signgam for -ffinite-math-only
1235 for C99-based standards
1236 [19212] libc: features.h not -Wundef clean
1237 [19213] math: [i386/x86_64] log* (1) incorrect zero sign for -ffinite-
1239 [19214] libc: Family and model identification for AMD CPU's are incorrect.
1240 [19219] libc: GLIBC build fails for ia64 with missing __nearbyintl
1241 [19228] math: [powerpc] nearbyint wrongly clears "inexact", leaves traps
1243 [19235] math: [powerpc64] lround, lroundf, llround, llroundf spurious
1244 "inexact" exceptions
1245 [19238] math: [powerpc] round, roundf spurious "inexact" for integer
1247 [19242] libc: strtol incorrect in Turkish locales
1248 [19243] malloc: reused_arena can pick an arena on the free list, leading
1249 to an assertion failure and reference count corruption
1250 [19253] time: tzset() ineffective when temporary TZ did not include DST
1252 [19266] math: strtod ("NAN(I)") incorrect in Turkish locales
1253 [19270] math: [hppa] Shared libm missing __isnanl
1254 [19285] libc: [hppa] sysdeps/unix/sysv/linux/hppa/bits/mman.h: missing
1255 MAP_HUGETLB and MAP_STACK defines
1256 [19313] nptl: Wrong __cpu_mask for x32
1257 [19347] libc: grantpt: try to force a specific gid even without pt_chown
1258 [19349] math: [ldbl-128ibm] tanhl inaccurate for small arguments
1259 [19350] math: [ldbl-128ibm] sinhl spurious overflows
1260 [19351] math: [ldbl-128ibm] logl inaccurate near 1
1261 [19363] time: x32: times() return value wrongly truncates/sign extends
1263 [19367] dynamic-link: Improve branch prediction on Silvermont
1264 [19369] network: Default domain name not reset by res_ninit when "search"
1265 / "domain" entry is removed from resolv.conf
1266 [19375] math: powerpc: incorrect results for POWER7 logb with negative
1268 [19385] localedata: bg_BG: time separator should be colon, not comma
1269 [19408] libc: linux personality syscall wrapper may erroneously return an
1270 error on 32-bit architectures
1271 [19415] libc: dladdr returns wrong names on hppa
1272 [19432] libc: iconv rejects redundant escape sequences in IBM900, IBM903,
1273 IBM905, IBM907, and IBM909
1274 [19439] math: Unix98 isinf and isnan functions conflict with C++11
1275 [19443] build: build failures with -DDEBUG
1276 [19451] build: Make check fails on test-double-vlen2
1277 [19462] libc: Glibc failed to build with -Os
1278 [19465] math: Wrong code with -Os
1279 [19466] time: time/tst-mktime2.c is compiled into an infinite loop with
1281 [19467] string: Fast_Unaligned_Load needs to be enabled for Excavator core
1283 [19475] libc: Glibc 2.22 doesn't build on sparc [PATCH]
1284 [19486] math: S390: Math tests fail with "Exception Inexact set".
1285 [19529] libc: [ARM]: FAIL: stdlib/tst-makecontext
1286 [19550] libc: [mips] mmap negative offset handling inconsistent with other
1288 [19590] math: Fail to build shared objects that use libmvec.so functions.
1292 * The following bugs are resolved with this release:
1294 438, 2981, 4719, 6544, 6792, 11216, 12836, 13028, 13064, 13151, 13152,
1295 14094, 14113, 14292, 14841, 14906, 14958, 15319, 15467, 15790, 15969,
1296 16159, 16339, 16350, 16351, 16352, 16353, 16361, 16512, 16526, 16538,
1297 16559, 16560, 16704, 16783, 16850, 17053, 17090, 17195, 17269, 17293,
1298 17322, 17403, 17475, 17523, 17542, 17569, 17581, 17588, 17596, 17620,
1299 17621, 17628, 17631, 17692, 17711, 17715, 17776, 17779, 17792, 17833,
1300 17836, 17841, 17912, 17916, 17930, 17932, 17944, 17949, 17964, 17965,
1301 17967, 17969, 17977, 17978, 17987, 17991, 17996, 17998, 17999, 18007,
1302 18019, 18020, 18029, 18030, 18032, 18034, 18036, 18038, 18039, 18042,
1303 18043, 18046, 18047, 18049, 18068, 18078, 18080, 18093, 18100, 18104,
1304 18110, 18111, 18116, 18125, 18128, 18134, 18138, 18185, 18196, 18197,
1305 18206, 18210, 18211, 18217, 18219, 18220, 18221, 18234, 18244, 18245,
1306 18247, 18287, 18319, 18324, 18333, 18346, 18371, 18383, 18397, 18400,
1307 18409, 18410, 18412, 18418, 18422, 18434, 18444, 18457, 18468, 18469,
1308 18470, 18479, 18483, 18495, 18496, 18497, 18498, 18502, 18507, 18508,
1309 18512, 18513, 18519, 18520, 18522, 18527, 18528, 18529, 18530, 18532,
1310 18533, 18534, 18536, 18539, 18540, 18542, 18544, 18545, 18546, 18547,
1311 18549, 18553, 18557, 18558, 18569, 18583, 18585, 18586, 18592, 18593,
1312 18594, 18602, 18612, 18613, 18619, 18633, 18635, 18641, 18643, 18648,
1313 18657, 18676, 18694, 18696, 18887.
1315 * Cache information can be queried via sysconf() function on s390 e.g. with
1316 _SC_LEVEL1_ICACHE_SIZE as argument.
1318 * A buffer overflow in gethostbyname_r and related functions performing DNS
1319 requests has been fixed. If the NSS functions were called with a
1320 misaligned buffer, the buffer length change due to pointer alignment was
1321 not taken into account. This could result in application crashes or,
1322 potentially arbitrary code execution, using crafted, but syntactically
1323 valid DNS responses. (CVE-2015-1781)
1325 * The time zone file parser has been made more robust against crafted time
1326 zone files, avoiding heap buffer overflows related to the processing of
1327 the tzh_ttisstdcnt and tzh_ttisgmtcnt fields, and a stack overflow due to
1328 large time zone data files. Overly long time zone specifiers in the TZ
1329 variable no longer result in stack overflows and crashes.
1331 * A powerpc and powerpc64 optimization for TLS, similar to TLS descriptors
1332 for LD and GD on x86 and x86-64, has been implemented. You will need
1333 binutils-2.24 or later to enable this optimization.
1335 * Character encoding and ctype tables were updated to Unicode 7.0.0, using
1336 new generator scripts contributed by Pravin Satpute and Mike FABIAN (Red
1337 Hat). These updates cause user visible changes, such as the fix for bug
1340 * CVE-2014-8121 The NSS backends shared internal state between the getXXent
1341 and getXXbyYY NSS calls for the same database, causing a denial-of-service
1342 condition in some applications.
1344 * Added vector math library named libmvec with the following vectorized x86_64
1345 implementations: cos, cosf, sin, sinf, sincos, sincosf, log, logf, exp, expf,
1347 The library can be disabled with --disable-mathvec. Use of the functions is
1348 enabled with -fopenmp -ffast-math starting from -O1 for GCC version >= 4.9.0.
1349 Shared library libmvec.so is linked in as needed when using -lm (no need to
1350 specify -lmvec explicitly for not static builds).
1351 Visit <https://sourceware.org/glibc/wiki/libmvec> for detailed information.
1353 * A new fmemopen implementation has been added with the goal of POSIX
1354 compliance. The new implementation fixes the following long-standing
1355 issues: BZ#6544, BZ#11216, BZ#12836, BZ#13151, BZ#13152, and BZ#14292. The
1356 old implementation is still present for use be by existing binaries.
1358 * The 32-bit sparc sigaction ABI was inadvertently broken in the 2.20 and 2.21
1359 releases. It has been fixed to match 2.19 and older, but binaries built
1360 against 2.20 and 2.21 might need to be recompiled. See BZ#18694.
1362 * Port to Native Client running on ARMv7-A (--host=arm-nacl).
1363 Contributed by Roland McGrath (Google).
1365 * The header <regexp.h> is deprecated, and will be removed in a future
1366 release. Use of this header will trigger a deprecation warning.
1367 Application developers should update their code to use <regex.h> instead.
1369 This header was formerly part of SUS, but was deprecated in 1994 and
1370 removed from the standard in 2001. Also, the glibc implementation
1371 leaks memory. See BZ#18681 for more details.
1375 * The following bugs are resolved with this release:
1377 6652, 10672, 12674, 12847, 12926, 13862, 14132, 14138, 14171, 14498,
1378 15215, 15378, 15884, 16009, 16418, 16191, 16469, 16576, 16617, 16618,
1379 16619, 16657, 16740, 16857, 17192, 17266, 17273, 17344, 17363, 17370,
1380 17371, 17411, 17460, 17475, 17485, 17501, 17506, 17508, 17522, 17555,
1381 17570, 17571, 17572, 17573, 17574, 17582, 17583, 17584, 17585, 17589,
1382 17594, 17601, 17608, 17616, 17625, 17630, 17633, 17634, 17635, 17647,
1383 17653, 17657, 17658, 17664, 17665, 17668, 17682, 17702, 17717, 17719,
1384 17722, 17723, 17724, 17725, 17732, 17733, 17744, 17745, 17746, 17747,
1385 17748, 17775, 17777, 17780, 17781, 17782, 17791, 17793, 17796, 17797,
1386 17801, 17803, 17806, 17834, 17844, 17848, 17868, 17869, 17870, 17885,
1389 * CVE-2015-1472 CVE-2015-1473 Under certain conditions wscanf can allocate
1390 too little memory for the to-be-scanned arguments and overflow the
1391 allocated buffer. The implementation now correctly computes the required
1392 buffer size when using malloc, and switches to malloc from alloca as
1395 * A new semaphore algorithm has been implemented in generic C code for all
1396 machines. Previous custom assembly implementations of semaphore were
1397 difficult to reason about or ensure that they were safe. The new version
1398 of semaphore supports machines with 64-bit or 32-bit atomic operations.
1399 The new semaphore algorithm is used by sem_init, sem_open, sem_post,
1400 sem_wait, sem_timedwait, sem_trywait, and sem_getvalue.
1402 * Port to Altera Nios II has been contributed by Mentor Graphics.
1404 * Optimized strcpy, stpcpy, strncpy, stpncpy, strcmp, and strncmp
1405 implementations for powerpc64/powerpc64le.
1406 Implemented by Adhemerval Zanella (IBM).
1408 * Added support for TSX lock elision of pthread mutexes on powerpc32, powerpc64
1409 and powerpc64le. This may improve lock scaling of existing programs on
1410 HTM capable systems. The lock elision code is only enabled with
1411 --enable-lock-elision=yes. Also, the TSX lock elision implementation for
1412 powerpc will issue a transaction abort on every syscall to avoid side
1413 effects being visible outside transactions.
1415 * Optimized strcpy, stpcpy, strchrnul and strrchr implementations for
1416 AArch64. Contributed by ARM Ltd.
1418 * i386 memcpy functions optimized with SSE2 unaligned load/store.
1420 * CVE-2104-7817 The wordexp function could ignore the WRDE_NOCMD flag
1421 under certain input conditions resulting in the execution of a shell for
1422 command substitution when the application did not request it. The
1423 implementation now checks WRDE_NOCMD immediately before executing the
1424 shell and returns the error WRDE_CMDSUB as expected.
1426 * CVE-2012-3406 printf-style functions could run into a stack overflow when
1427 processing format strings with a large number of format specifiers.
1429 * CVE-2014-9402 The nss_dns implementation of getnetbyname could run into an
1430 infinite loop if the DNS response contained a PTR record of an unexpected
1433 * The minimum GCC version that can be used to build this version of the GNU
1434 C Library is GCC 4.6. Older GCC versions, and non-GNU compilers, can
1435 still be used to compile programs using the GNU C Library.
1437 * The GNU C Library is now built with -Werror by default. This can be
1438 disabled by configuring with --disable-werror.
1440 * New locales: tu_IN, bh_IN, raj_IN, ce_RU.
1442 * The obsolete sigvec function has been removed. This was the original
1443 4.2BSD interface that inspired the POSIX.1 sigaction interface, which
1444 programs have been using instead for about 25 years. Of course, ABI
1445 compatibility for old binaries using sigvec remains intact.
1447 * Merged gettext 0.19.3 into the intl subdirectory. This fixes building
1448 with newer versions of bison.
1450 * Support for MIPS o32 FPXX, FP64A and FP64 ABI Extensions.
1451 The original MIPS o32 hard-float ABI requires an FPU where double-precision
1452 registers overlay two consecutive single-precision registers. MIPS32R2
1453 introduced a new FPU mode (FR=1) where double-precision registers extend the
1454 corresponding single-precision registers which is incompatible with the
1455 o32 hard-float ABI. The MIPS SIMD ASE and the MIPSR6 architecture both
1456 require the use of FR=1 making a transition necessary. New o32 ABI
1457 extensions enable users to migrate over time from the original o32 ABI
1458 through to the updated o32 FP64 ABI. To achieve this the dynamic linker now
1459 tracks the ABI of any loaded object and verifies that new objects are
1460 compatible. Mode transitions will also be requested as required and
1461 unsupportable objects will be rejected. The ABI checks include both soft and
1462 hard float ABIs for o32, n32 and n64.
1464 GCC 5 with GNU binutils 2.25 onwards:
1465 It is strongly recommended that all o32 system libraries are built using the
1466 new o32 FPXX ABI (-mfpxx) to facilitate the transition as this is compatible
1467 with the original and all new o32 ABI extensions. Configure a MIPS GCC
1468 compiler using --with-fp-32=xx to set this by default.
1472 * The following bugs are resolved with this release:
1474 6804, 9894, 11505, 12994, 13347, 13651, 14308, 14770, 15119, 15132, 15347,
1475 15514, 15698, 15804, 15894, 15946, 16002, 16064, 16095, 16194, 16198,
1476 16275, 16284, 16287, 16315, 16348, 16349, 16354, 16357, 16362, 16447,
1477 16516, 16532, 16539, 16545, 16561, 16562, 16564, 16574, 16599, 16600,
1478 16609, 16610, 16611, 16613, 16619, 16623, 16629, 16632, 16634, 16639,
1479 16642, 16648, 16649, 16670, 16674, 16677, 16680, 16681, 16683, 16689,
1480 16695, 16701, 16706, 16707, 16712, 16713, 16714, 16724, 16731, 16739,
1481 16740, 16743, 16754, 16758, 16759, 16760, 16770, 16786, 16789, 16791,
1482 16796, 16799, 16800, 16815, 16823, 16824, 16831, 16838, 16839, 16849,
1483 16854, 16876, 16877, 16878, 16882, 16885, 16888, 16890, 16892, 16912,
1484 16915, 16916, 16917, 16918, 16922, 16927, 16928, 16932, 16943, 16958,
1485 16965, 16966, 16967, 16977, 16978, 16984, 16990, 16996, 17009, 17022,
1486 17031, 17042, 17048, 17050, 17058, 17061, 17062, 17069, 17075, 17078,
1487 17079, 17084, 17086, 17088, 17092, 17097, 17125, 17135, 17137, 17150,
1488 17153, 17187, 17213, 17259, 17261, 17262, 17263, 17319, 17325, 17354.
1490 * Reverted change of ABI data structures for s390 and s390x:
1491 On s390 and s390x the size of struct ucontext and jmp_buf was increased in
1492 2.19. This change is reverted in 2.20. The introduced 2.19 symbol versions
1493 of getcontext, setjmp, _setjmp, __sigsetjmp, longjmp, _longjmp, siglongjmp
1494 are preserved pointing straight to the same implementation as the old ones.
1495 Given that, new callers will simply provide a too-big buffer to these
1496 functions. Any applications/libraries out there that embed jmp_buf or
1497 ucontext_t in an ABI-relevant data structure that have already been rebuilt
1498 against 2.19 headers will have to rebuilt again. This is necessary in any
1499 case to revert the breakage in their ABI caused by the glibc change.
1501 * Support for file description locks is added to systems running the
1502 Linux kernel. The standard file locking interfaces are extended to
1503 operate on file descriptions, not file descriptors, via the use of
1504 F_OFD_GETLK, F_OFD_SETLK, and F_OFD_SETLKW. File description locks
1505 are associated with an open file instead of a process.
1507 * Optimized strchr implementation for AArch64. Contributed by ARM Ltd.
1509 * The minimum Linux kernel version that this version of the GNU C Library
1510 can be used with is 2.6.32.
1512 * Running the testsuite no longer terminates as soon as a test fails.
1513 Instead, a file tests.sum (xtests.sum from "make xcheck") is generated,
1514 with PASS or FAIL lines for individual tests. A summary of the results is
1515 printed, including a list of failing lists, and "make check" exits with
1516 error status if there were any unexpected failures. "make check
1517 stop-on-test-failure=y" may be used to keep the old behavior.
1519 * The am33 port, which had not worked for several years, has been removed
1522 * The _BSD_SOURCE and _SVID_SOURCE feature test macros are no longer
1523 supported; they now act the same as _DEFAULT_SOURCE (but generate a
1524 warning). Except for cases where _BSD_SOURCE enabled BSD interfaces that
1525 conflicted with POSIX (support for which was removed in 2.19), the
1526 interfaces those macros enabled remain available when compiling with
1527 _GNU_SOURCE defined, with _DEFAULT_SOURCE defined, or without any feature
1528 test macros defined.
1530 * Optimized strcmp implementation for ARMv7. Contributed by ARM Ltd.
1532 * Added support for TX lock elision of pthread mutexes on s390 and s390x.
1533 This may improve lock scaling of existing programs on TX capable systems.
1534 The lock elision code is only built with --enable-lock-elision=yes and
1535 then requires a GCC version supporting the TX builtins. With lock elision
1536 default mutexes are elided via __builtin_tbegin, if the cpu supports
1537 transactions. By default lock elision is not enabled and the elision code
1540 * CVE-2014-4043 The posix_spawn_file_actions_addopen implementation did not
1541 copy the path argument. This allowed programs to cause posix_spawn to
1542 deference a dangling pointer, or use an unexpected pathname argument if
1543 the string was modified after the posix_spawn_file_actions_addopen
1546 * All supported architectures now use the main glibc sysdeps directory
1547 instead of some being in a separate "ports" directory (which was
1548 distributed separately before glibc 2.17).
1550 * The NPTL implementation of POSIX pthreads is no longer an "add-on".
1551 On configurations that support it (all Linux configurations), it's now
1552 used regardless of the --enable-add-ons switch to configure. It is no
1553 longer possible to build such configurations without pthreads support.
1555 * Locale names, including those obtained from environment variables (LANG
1556 and the LC_* variables), are more tightly checked for proper syntax.
1557 setlocale will now fail (with EINVAL) for locale names that are overly
1558 long, contain slashes without starting with a slash, or contain ".." path
1559 components. (CVE-2014-0475) Previously, some valid locale names were
1560 silently replaced with the "C" locale when running in AT_SECURE mode
1561 (e.g., in a SUID program). This is no longer necessary because of the
1564 * On x86-64, the dynamic linker's lazy-binding support is now compatible
1565 with application code using Intel MPX instructions. (With all previous
1566 versions, the MPX register state could be clobbered when making calls
1567 into or out of a shared library.) Note that while the new dynamic
1568 linker is compatible with all known x86 hardware whether or not it
1569 supports Intel MPX, some x86 instruction-set emulators might fail to
1570 handle the new instruction encodings. This is known to affect Valgrind
1571 versions up through 3.9 (but will be fixed in the forthcoming 3.10
1572 release), and might affect other tools that do instruction emulation.
1574 * Support for loadable gconv transliteration modules has been removed.
1575 The support for transliteration modules has been non-functional for
1576 over a decade, and the removal is prompted by security defects. The
1577 normal gconv conversion modules are still supported. Transliteration
1578 with //TRANSLIT is still possible, and the //IGNORE specifier
1579 continues to be supported. (CVE-2014-5119)
1581 * Decoding a crafted input sequence in the character sets IBM933, IBM935,
1582 IBM937, IBM939, IBM1364 could result in an out-of-bounds array read,
1583 resulting a denial-of-service security vulnerability in applications which
1584 use functions related to iconv. (CVE-2014-6040)
1588 * The following bugs are resolved with this release:
1590 156, 387, 431, 762, 832, 926, 2801, 4772, 6786, 6787, 6807, 6810, 6981,
1591 7003, 9721, 9954, 10253, 10278, 11087, 11157, 11214, 12100, 12486, 12751,
1592 12986, 13028, 13982, 13985, 14029, 14032, 14120, 14143, 14155, 14286,
1593 14547, 14699, 14752, 14782, 14876, 14910, 15004, 15048, 15073, 15089,
1594 15128, 15218, 15268, 15277, 15308, 15362, 15374, 15400, 15425, 15427,
1595 15483, 15522, 15531, 15532, 15593, 15601, 15608, 15609, 15610, 15632,
1596 15640, 15670, 15672, 15680, 15681, 15723, 15734, 15735, 15736, 15748,
1597 15749, 15754, 15760, 15763, 15764, 15797, 15799, 15825, 15843, 15844,
1598 15846, 15847, 15849, 15850, 15855, 15856, 15857, 15859, 15867, 15886,
1599 15887, 15890, 15892, 15893, 15895, 15897, 15901, 15905, 15909, 15915,
1600 15917, 15919, 15921, 15923, 15939, 15941, 15948, 15963, 15966, 15968,
1601 15985, 15988, 15997, 16032, 16034, 16036, 16037, 16038, 16041, 16046,
1602 16055, 16071, 16072, 16074, 16077, 16078, 16103, 16112, 16143, 16144,
1603 16146, 16150, 16151, 16153, 16167, 16169, 16172, 16195, 16214, 16245,
1604 16271, 16274, 16283, 16289, 16293, 16314, 16316, 16330, 16337, 16338,
1605 16356, 16365, 16366, 16369, 16372, 16375, 16379, 16381, 16384, 16385,
1606 16386, 16387, 16390, 16394, 16398, 16400, 16407, 16408, 16414, 16430,
1607 16431, 16453, 16474, 16506, 16510, 16529
1609 * Slovenian translations for glibc messages have been contributed by the
1610 Translation Project's Slovenian team of translators.
1612 * The public headers no longer use __unused nor __block. This change is to
1613 support compiling programs that are derived from BSD sources and use
1614 __unused internally, and to support compiling with Clang's -fblock
1615 extension which uses __block.
1617 * CVE-2012-4412 The strcoll implementation caches indices and rules for
1618 large collation sequences to optimize multiple passes. This cache
1619 computation may overflow for large collation sequences and may cause a
1620 stack or buffer overflow. This is now fixed to use a slower algorithm
1621 which does not use a cache if there is an integer overflow.
1623 * CVE-2012-4424 The strcoll implementation uses malloc to cache indices and
1624 rules for large collation sequences to optimize multiple passes and falls
1625 back to alloca if malloc fails, resulting in a possible stack overflow.
1626 The implementation now falls back to an uncached collation sequence lookup
1629 * CVE-2013-4788 The pointer guard used for pointer mangling was not
1630 initialized for static applications resulting in the security feature
1631 being disabled. The pointer guard is now correctly initialized to a
1632 random value for static applications. Existing static applications need
1633 to be recompiled to take advantage of the fix (bug 15754).
1635 * CVE-2013-4237 The readdir_r function could write more than NAME_MAX bytes
1636 to the d_name member of struct dirent, or omit the terminating NUL
1637 character. (Bugzilla #14699).
1639 * CVE-2013-4332 The pvalloc, valloc, memalign, posix_memalign and
1640 aligned_alloc functions could allocate too few bytes or corrupt the
1641 heap when passed very large allocation size values (Bugzilla #15855,
1644 * CVE-2013-4458 Stack overflow in getaddrinfo with large number of results
1645 for AF_INET6 has been fixed (Bugzilla #16072).
1647 * New locales: ak_GH, anp_IN, ar_SS, cmn_TW, hak_TW, lzh_TW, nan_TW, pap_AW,
1648 pap_CW, quz_PE, the_NP.
1650 * Substantially revised locales: gd_GB, ht_HT
1652 * The LC_ADDRESS field was updated to support country_car for almost all
1655 * ISO 1427 definitions were updated.
1657 * ISO 3166 definitions were updated.
1659 * The localedef utility now supports --big-endian and --little-endian
1660 command-line options to generate locales for a different system from that
1661 for which the C library was built.
1663 * Binary locale files now only depend on the endianness of the system for
1664 which they are generated and not on other properties of that system. As a
1665 consequence, binary files generated with new localedef may be incompatible
1666 with old versions of the GNU C Library, and binary files generated with
1667 old localedef may be incompatible with this version of the GNU C Library,
1668 in the following circumstances:
1670 + Locale files may be incompatible on m68k systems.
1672 + Locale archive files (but not separate files for individual locales) may
1673 be incompatible on systems where plain "char" is signed.
1675 * The configure option --disable-versioning has been removed. Builds with
1676 --disable-versioning had not worked for several years.
1678 * ISO 639 definitions were updated for Chiga (cgg) and Chinese (gan, hak, czh,
1679 cjy, lzh, cmn, mnp, cdo, czo, cpx, wuu, hsn, yue).
1681 * SystemTap probes for malloc have been introduced.
1683 * SystemTap probes for slow multiple precision fallback paths of
1684 transcendental functions have been introduced.
1686 * Support for powerpc64le has been added.
1688 * The soft-float powerpc port now supports e500 processors.
1690 * Support for STT_GNU_IFUNC symbols added for ppc32/power4+ and ppc64.
1692 * A new feature test macro _DEFAULT_SOURCE is available to enable the same
1693 set of header declarations that are enabled by default, even when other
1694 feature test macros or compiler options such as -std=c99 would otherwise
1695 disable some of those declarations.
1697 * The _BSD_SOURCE feature test macro no longer enables BSD interfaces that
1698 conflict with POSIX. The libbsd-compat library (which was a dummy library
1699 that did nothing) has also been removed.
1701 * Preliminary documentation about Multi-Thread, Async-Signal and
1702 Async-Cancel Safety has been added.
1704 * Change of ABI data structures for s390 and s390x:
1705 On s390 and s390x the size of struct ucontext and jmp_buf was increased to
1706 allow for future hardware extensions. All library functions that accept or
1707 return these structures were versioned in order to provide backwards
1708 compatibility with existing code. However, not all cases can be handled
1709 with interface versioning. If an application embeds either structure into
1710 another structure and that structure is passed to another compilation unit
1711 which expects the newer larger-sized object then any access to the new
1712 fields will result in undefined behaviour. Similarly any access to fields
1713 that were moved by the enlarging of the structures will cause undefined
1714 behaviour. To fix the undefined behaviour all objects that are part of the
1715 final in-memory image must agree on the size of structures, and this may
1716 require recompilation.
1720 * The following bugs are resolved with this release:
1722 2546, 2560, 5159, 6809, 7006, 10060, 10062, 10283, 10357, 10686, 11120,
1723 11561, 12310, 12387, 12492, 12515, 12723, 13550, 13889, 13951, 13988,
1724 14142, 14176, 14200, 14256, 14280, 14293, 14317, 14327, 14478, 14496,
1725 14582, 14686, 14812, 14888, 14894, 14907, 14908, 14909, 14920, 14941,
1726 14952, 14964, 14981, 14982, 14985, 14991, 14994, 14996, 15000, 15003,
1727 15006, 15007, 15014, 15020, 15022, 15023, 15036, 15054, 15055, 15062,
1728 15078, 15084, 15085, 15086, 15100, 15160, 15214, 15221, 15232, 15234,
1729 15283, 15285, 15287, 15304, 15305, 15307, 15309, 15327, 15330, 15335,
1730 15336, 15337, 15339, 15342, 15346, 15359, 15361, 15366, 15380, 15381,
1731 15394, 15395, 15405, 15406, 15409, 15416, 15418, 15419, 15423, 15424,
1732 15426, 15429, 15431, 15432, 15441, 15442, 15448, 15465, 15480, 15485,
1733 15488, 15490, 15492, 15493, 15497, 15506, 15529, 15536, 15553, 15577,
1734 15583, 15618, 15627, 15631, 15654, 15655, 15666, 15667, 15674, 15711,
1737 * CVE-2013-2207 Incorrectly granting access to another user's pseudo-terminal
1738 has been fixed by disabling the use of pt_chown (Bugzilla #15755).
1739 Distributions can re-enable building and using pt_chown via the new configure
1740 option `--enable-pt_chown'. Enabling the use of pt_chown carries with it
1741 considerable security risks and should only be used if the distribution
1742 understands and accepts the risks.
1744 * CVE-2013-0242 Buffer overrun in regexp matcher has been fixed (Bugzilla
1747 * CVE-2013-1914 Stack overflow in getaddrinfo with many results has been
1748 fixed (Bugzilla #15330).
1750 * Add support for calling C++11 thread_local object destructors on thread
1751 and program exit. This needs compiler support for offloading C++11
1752 destructor calls to glibc.
1754 * Improved worst case performance of libm functions with double inputs and
1757 * Support for priority inherited mutexes in pthread condition variables on
1758 non-x86 architectures.
1760 * Port to Xilinx MicroBlaze contributed by David Holsgrove.
1762 * Optimized string functions for AArch64. Implemented by Marcus Shawcroft.
1764 * Optimized string functions for ARM. Implemented by Will Newton and
1767 * Optimized libm functions for SPARC. Implemented by David S. Miller.
1769 * Support for building more of ARM glibc as Thumb-2 code. Implemented by
1772 * Support for building most of MIPS glibc as MIPS16 code. Implemented by
1773 Chung-Lin Tang, Maciej W. Rozycki and Maxim Kuvyrkov.
1775 * Added a benchmark framework to track performance of functions in glibc.
1777 * New <math.h> macro named issignaling to check for a signaling NaN (sNaN).
1778 It is based on draft TS 18661 and currently enabled as a GNU extension.
1780 * On Linux, the clock function now uses the clock_gettime system call
1781 for improved precision, rather than old times system call.
1783 * Added support for version-3 tz format files. This is needed when using
1784 the tz database release 2013e or later, and affects a few unusual cases --
1785 currently only TZ='America/Godthab' for time stamps after 2037.
1787 * Added new API functions pthread_getattr_default_np and
1788 pthread_setattr_default_np to get and set the default pthread
1789 attributes of a process.
1791 * Added support for TSX lock elision for pthread mutexes on i386 and x86-64.
1792 This may improve lock scaling of existing programs on TSX capable systems.
1793 When the --enable-lock-elision=yes parameter is specified at configure
1794 time lock elision will be enabled by default for all PTHREAD_MUTEX_DEFAULT
1797 * Support added for AT_HWCAP2 (to coincide with Linux kernel 3.10
1798 availability). Implemented by Ryan S. Arnold.
1800 * Support added for POWER8 platform. Implemented by Ryan S. Arnold.
1804 * The following bugs are resolved with this release:
1806 1349, 3439, 3479, 3665, 5044, 5246, 5298, 5400, 6530, 6677, 6778, 6808,
1807 9685, 9914, 10014, 10038, 10114, 10191, 10631, 10873, 11438, 11607, 11638,
1808 11741, 12140, 13013, 13412, 13542, 13601, 13603, 13604, 13629, 13679,
1809 13696, 13698, 13717, 13741, 13759, 13761, 13763, 13881, 13939, 13950,
1810 13952, 13966, 14042, 14047, 14090, 14150, 14151, 14152, 14154, 14157,
1811 14166, 14173, 14195, 14197, 14237, 14246, 14251, 14252, 14283, 14298,
1812 14303, 14307, 14328, 14331, 14336, 14337, 14347, 14349, 14368, 14376,
1813 14417, 14447, 14459, 14476, 14477, 14501, 14505, 14510, 14516, 14518,
1814 14519, 14530, 14532, 14538, 14543, 14544, 14545, 14557, 14562, 14568,
1815 14576, 14579, 14583, 14587, 14595, 14602, 14610, 14621, 14638, 14645,
1816 14648, 14652, 14660, 14661, 14669, 14672, 14683, 14694, 14716, 14719,
1817 14743, 14767, 14783, 14784, 14785, 14793, 14796, 14797, 14801, 14803,
1818 14805, 14807, 14811, 14815, 14821, 14822, 14824, 14828, 14831, 14833,
1819 14835, 14838, 14856, 14863, 14865, 14866, 14868, 14869, 14871, 14872,
1820 14879, 14889, 14893, 14898, 14914.
1822 * Optimization of memcpy for MIPS.
1824 * CVE-2011-4609 svc_run() produces high cpu usage when accept fails with
1825 EMFILE has been fixed (Bugzilla #14889).
1827 * The add-on ports collection is now distributed in the "ports" subdirectory
1828 of the main GNU C Library distribution, rather than separately.
1830 * Port to ARM AArch64 contributed by Linaro.
1832 * Support for STT_GNU_IFUNC symbols added for s390 and s390x.
1833 Optimized versions of memcpy, memset, and memcmp added for System z10 and
1835 Implemented by Andreas Krebbel.
1837 * The new function secure_getenv allows secure access to the environment,
1838 returning NULL if running in a SUID/SGID process. This function replaces
1839 the internal function __secure_getenv.
1841 * SystemTap static probes have been added into the dynamic linker.
1842 Implemented by Gary Benson.
1844 * Optimizations of string functions strstr, strcasestr and memmem.
1845 Implemented by Maxim Kuvyrkov.
1847 * The minimum Linux kernel version that this version of the GNU C Library
1848 can be used with is 2.6.16.
1850 * Optimizations of string functions memchr, wcschr, wcscpy, and wcsrchr for
1851 powerpc POWER7. Implemented by Will Schmidt.
1853 * New configure option --disable-nscd builds the C library such that it
1854 never attempts to contact the Name Service Caching Daemon (nscd).
1855 New configure option --disable-build-nscd avoids building nscd itself;
1856 this is the default if --disable-nscd is used.
1858 * Improved support for cross-compilation, including cross-testing and
1859 bootstrap builds without a previously built glibc.
1861 * Several testsuite tests are now able to test multiple IFUNC variants of an
1862 interface, rather than just testing the one that would be chooen by
1865 * New configure options --with-bugurl and --with-pkgversion, for
1866 distributors to use to embed their bug-reporting and package version
1867 information in --help and --version output.
1869 * The ttyname and ttyname_r functions on Linux now fall back to searching for
1870 the tty file descriptor in /dev/pts or /dev if /proc is not available. This
1871 allows creation of chroots without the procfs mounted on /proc.
1873 * The `crypt' function now fails if passed salt bytes that violate the
1874 specification for those values. On Linux, the `crypt' function will
1875 consult /proc/sys/crypto/fips_enabled to determine if "FIPS mode" is
1876 enabled, and fail on encrypted strings using the MD5 or DES algorithm
1877 when the mode is enabled.
1879 * The `clock_*' suite of functions (declared in <time.h>) is now available
1880 directly in the main C library. Previously it was necessary to link with
1881 -lrt to use these functions. This change has the effect that a
1882 single-threaded program that uses a function such as `clock_gettime' (and
1883 is not linked with -lrt) will no longer implicitly load the pthreads
1884 library at runtime and so will not suffer the overheads associated with
1885 multi-thread support in other code such as the C++ runtime library.
1887 * New locales: ayc_PE, doi_IN, ia_FR, mni_IN, nhn_MX, niu_NU, niu_NZ,
1892 * The following bugs are resolved with this release:
1894 174, 208, 350, 369, 411, 706, 766, 2074, 2541, 2547, 2548, 2550, 2551,
1895 2552, 2553, 2554, 2562, 2563, 2565, 2566, 2570, 2576, 2636, 2678, 3335,
1896 3440, 3748, 3768, 3866, 3868, 3906, 3976, 3992, 4026, 4108, 4596, 4822,
1897 5077, 5461, 5805, 5993, 6471, 6486, 6578, 6649, 6730, 6770, 6794, 6884,
1898 6890, 6894, 6895, 6907, 6911, 6959, 7064, 9739, 9902, 10110, 10135, 10140,
1899 10153, 10210, 10254, 10346, 10375, 10545, 10716, 10846, 10882, 11174,
1900 11261, 11322, 11365, 11451, 11494, 11521, 11677, 11837, 11959, 12047,
1901 12097, 12193, 12194, 12297, 12298, 12301, 12340, 12354, 12416, 12495,
1902 13058, 13223, 13361, 13525, 13526, 13527, 13528, 13529, 13530, 13531,
1903 13532, 13533, 13547, 13551, 13552, 13553, 13555, 13556, 13559, 13563,
1904 13566, 13576, 13579, 13583, 13592, 13594, 13613, 13618, 13637, 13656,
1905 13658, 13673, 13691, 13695, 13704, 13705, 13706, 13718, 13726, 13738,
1906 13739, 13743, 13750, 13758, 13760, 13761, 13775, 13786, 13787, 13792,
1907 13806, 13824, 13840, 13841, 13844, 13846, 13848, 13851, 13852, 13854,
1908 13871, 13872, 13873, 13879, 13882, 13883, 13884, 13885, 13886, 13892,
1909 13895, 13908, 13910, 13911, 13912, 13913, 13914, 13915, 13916, 13917,
1910 13918, 13919, 13920, 13921, 13922, 13923, 13924, 13926, 13927, 13928,
1911 13938, 13941, 13942, 13954, 13955, 13956, 13963, 13967, 13968, 13970,
1912 13973, 13979, 13983, 13986, 13996, 14012, 14027, 14033, 14034, 14036,
1913 14040, 14043, 14044, 14048, 14049, 14050, 14053, 14055, 14059, 14064,
1914 14075, 14080, 14083, 14103, 14104, 14109, 14112, 14117, 14122, 14123,
1915 14134, 14153, 14183, 14188, 14199, 14210, 14218, 14229, 14241, 14273,
1918 * Support for the x32 ABI on x86-64 added. The x32 target is selected by
1919 configuring glibc with:
1920 BUILD_CC='gcc' CC='gcc -mx32' CXX='g++ -mx32'
1921 Visit <http://sites.google.com/site/x32abi/> for more x32 ABI info.
1922 Implemented by H.J. Lu.
1926 + define static_assert
1928 + do not declare gets
1930 + declare at_quick_exit and quick_exit also for ISO C11
1932 + aligned_alloc. NB: The code is deliberately allows the size parameter
1933 to not be a multiple of the alignment. This is a moronic requirement
1934 in the standard but it is only a requirement on the caller, not the
1937 + timespec_get added
1939 + uchar.h support added
1941 + CMPLX, CMPLXF, CMPLXL added
1943 Implemented by Ulrich Drepper.
1945 * Support for the IA-64 has been moved to ports.
1947 * Remove support for anything but ELF binary format
1949 * Checking versions of poll, ppoll added.
1950 Implemented by Ulrich Drepper.
1952 * More generic and 64-bit performance optimizations to math functions.
1953 Implemented by Ulrich Drepper.
1955 * New configure option --enable-obsolete-rpc makes the deprecated RPC
1956 headers and functions available at compile time as they were before
1957 version 2.14. This option will be removed at some time in the future
1958 after the TI-RPC library becomes fully sufficient for the needs of
1959 existing applications.
1961 * Compatibility code for Linux kernel versions before 2.4 has been removed.
1962 Note that glibc is not expected to work with any Linux kernel version
1965 * New header <sys/auxv.h> and function getauxval allowing easy access to
1966 the AT_* key-value pairs passed from the Linux kernel. The header also
1967 defines the HWCAP_* bits associated with the AT_HWCAP key.
1969 * New locales: mag_IN
1971 * New configure option --enable-systemtap builds SystemTap static probes
1972 into libc for setjmp and longjmp and into libpthread for various operations.
1973 So far the setjmp/longjmp probes and some of the libpthread probes are
1974 provided only for i*86 and x86_64.
1975 Implemented by Roland McGrath and Rayson Ho.
1977 * Optimized expf for x86-32 and x86-64. Implemented by Liubov Dmitrieva.
1979 * More optimized functions for PowerPC. Implemented by Adhemerval Zanella
1982 * More optimized functions for SPARC. Implemented by David S. Miller.
1984 * Improved support for cross-compilation, especially bootstrap builds
1985 without a previously built glibc.
1987 * Ports for the TILE-Gx and TILEPro families of processors. Contributed by
1988 Chris Metcalf from Tilera.
1990 * Support for the old ARM ABI has been removed from ports. Only the EABI is
1991 now supported for ARM processors.
1993 * The hard-float variant of the ARM EABI now uses /lib/ld-linux-armhf.so.3
1994 as the name of the dynamic linker, to distinguish it from the
1995 /lib/ld-linux.so.3 dynamic linker used for the base EABI.
1997 * Support for CRIS has been removed from ports.
1999 * A new class of installed header has been documented for low-level
2000 platform-specific functionality. PowerPC added the first instance with a
2001 function to provide time base register access. Contributed by Tulio
2002 Magno Quites Machado Filho.
2004 * ix86 configurations now install header files that are consistent with
2005 what x86-64 configurations install. These same header files can be used
2006 for -m32, -m64, or -mx32 builds.
2007 Contributed by H.J. Lu.
2009 * Math library bug fixes. A thorough audit of all open math library bugs was
2010 conducted by Joseph Myers. Significant progress was made on many math
2011 library bugs resulting in more accurate exceptions and function results.
2012 Many thanks to all those that contributed including Andreas Jaeger for his
2013 patch review and work on the x87 trigonometric instruction issues.
2015 * Timezone data is no longer installed. Timezone-related binaries and scripts
2016 will continue to be installed. Users should obtain their timezone data from
2017 their distribution provider or from the tzdata package at
2018 <ftp://munnari.oz.au/pub/>.
2022 * The following bugs are resolved with this release:
2024 6779, 6783, 9696, 10103, 10709, 11589, 11929, 12403, 12786, 12840, 12847,
2025 12868, 12852, 12874, 12885, 12892, 12906, 12907, 12922, 12935, 12962,
2026 13007, 13021, 13061, 13062, 13067, 13068, 13085, 13088, 13090, 13092,
2027 13096, 13114, 13118, 13123, 13134, 13138, 13147, 13150, 13166, 13179,
2028 13185, 13189, 13192, 13268, 13276, 13282, 13291, 13305, 13328, 13335,
2029 13337, 13344, 13358, 13367, 13413, 13416, 13423, 13439, 13446, 13472,
2030 13484, 13506, 13515, 13523, 13524, 13538, 13540
2032 * New program pldd to list loaded object of a process
2033 Implemented by Ulrich Drepper.
2035 * Add nss_db support back to glibc. No more dependency on Berkeley db
2036 and support for initgroups lookups.
2037 Implemented by Ulrich Drepper.
2039 * Optimized strcpy, strncpy, stpcpy, stpncpy for SSE2 and SSSE3 on x86-32.
2040 Contributed by HJ Lu.
2042 * Improved strcpy, strncpy, stpcpy, stpncpy for SSE2 and SSSE3 on x86-64.
2043 Contributed by HJ Lu.
2045 * Optimized strcat, strncat on x86-64 and optimized wcscmp, wcslen, strnlen
2046 on x86-32 and x86-64.
2047 Contributed by Liubov Dmitrieva.
2049 * Optimized strchr and strrchr for SSE on x86-32.
2050 Contributed by Liubov Dmitrieva.
2052 * Optimized memchr, memrchr, rawmemchr, memcmp, wmemcmp, wcschr, wcscpy
2053 for x86-64 and x86-32.
2054 Contributed by Liubov Dmitrieva.
2056 * New interfaces: scandirat, scandirat64
2057 Implemented by Ulrich Drepper.
2059 * Checking versions of FD_SET, FD_CLR, and FD_ISSET added.
2060 Implemented by Ulrich Drepper.
2062 * nscd now also caches the netgroup database.
2063 Implemented by Ulrich Drepper.
2065 * Integrate libm with gcc's -ffinite-math-only option.
2066 Implemented by Ulrich Drepper.
2068 * Lots of generic, 64-bit, and x86-64-specific performance optimizations
2069 to math functions. Implemented by Ulrich Drepper.
2071 * Optimized strcasecmp and strncasecmp for AVX on x86-64.
2072 Implemented by Ulrich Drepper.
2074 * New Linux interfaces: process_vm_readv, process_vm_writev
2076 * Optimized strcasecmp and strncasecmp for SSSE3 and SSE4.2 on x86-32.
2077 Implemented by Ulrich Drepper.
2079 * Optimized nearbyint and strcasecmp for PPC.
2080 Implemented by Adhemerval Zanella.
2082 * New locales: bho_IN, unm_US, es_CU, ta_LK
2086 * The following bugs are resolved with this release:
2088 386, 6420, 7101, 9730, 9732, 9809, 10138, 10149, 10157, 11099, 11257,
2089 11258, 11487, 11532, 11558, 11578, 11634, 11653, 11668, 11697, 11724,
2090 11781, 11799, 11820, 11837, 11857, 11884, 11892, 11895, 11901, 11945,
2091 11947, 11952, 11987, 12052, 12083, 12158, 12178, 12200, 12346, 12350,
2092 12393, 12420, 12432, 12445, 12449, 12453, 12454, 12460, 12469, 12489,
2093 12509, 12510, 12511, 12518, 12527, 12541, 12545, 12551, 12582, 12583,
2094 12587, 12597, 12601, 12611, 12625, 12626, 12631, 12650, 12653, 12655,
2095 12660, 12671, 12681, 12684, 12685, 12711, 12713, 12714, 12717, 12723,
2096 12724, 12734, 12738, 12746, 12766, 12775, 12777, 12782, 12788, 12792,
2097 12795, 12811, 12813, 12814, 12841
2099 * The RPC implementation in libc is obsoleted. Old programs keep working
2100 but new programs cannot be linked with the routines in libc anymore.
2101 Programs in need of RPC functionality must be linked against TI-RPC.
2102 The TI-RPC implementation is IPv6 enabled and there are other benefits.
2104 Visible changes of this change include (obviously) the inability to link
2105 programs using RPC functions without referencing the TI-RPC library and the
2106 removal of the RPC headers from the glibc headers.
2107 Implemented by Ulrich Drepper.
2109 * New Linux interfaces: clock_adjtime, name_to_handle_at, open_by_handle_at,
2110 syncfs, setns, sendmmsg
2112 * New locales: os_RU, bem_ZA, en_ZA, ff_SN, sw_KE, sw_TZ, lb_LU, wae_CH,
2113 yue_HK, lij_IT, mhr_RU
2115 * New encodings: CP770, CP771, CP772, CP773, CP774
2117 * New program sotruss to trace calls through PLTs
2118 Implemented by Ulrich Drepper.
2120 * The malloc hook implementation is marked deprecated and will be removed
2121 from the default implementation in the next version. The design never
2122 worked ever since the introduction of threads. Even programs which do
2123 not create threads themselves can use multiple threads created internally.
2127 * The following bugs are resolved with this release:
2129 3268, 6812, 7066, 10085, 10484, 10563, 10851, 11149, 11155, 11577, 11611,
2130 11640, 11655, 11701, 11840, 11856, 11883, 11903, 11904, 11968, 11979,
2131 12005, 12037, 12067, 12077, 12078, 12092, 12093, 12107, 12108, 12113,
2132 12140, 12159, 12167, 12191, 12194, 12201, 12204, 12205, 12207, 12348,
2135 * New Linux interfaces: prlimit, prlimit64, fanotify_init, fanotify_mark
2137 * POWER7 optimizations: memset, memcmp, strncmp
2139 * New optimized string functions for x86-64: strnlen (SSE2),
2140 strcasecmp (SSE2, SSSE3, SSE4.2), strncasecmp (SSE2, SSSE3, SSE4.2)
2141 Implemented by Ulrich Drepper.
2145 * The following bugs are resolved with this release:
2147 3662, 4457, 5553, 10162, 10401, 10414, 10554, 10824, 10864, 10915,
2148 10918, 10936, 10939, 10958, 10968, 10969, 10972, 10992, 11000, 11001,
2149 11007, 11010, 11027, 11039, 11040, 11041, 11043, 11046, 11056, 11070,
2150 11093, 11115, 11125, 11126, 11127, 11134, 11141, 11149, 11183, 11184,
2151 11185, 11186, 11187, 11188, 11189, 11190, 11191, 11192, 11193, 11194,
2152 11200, 11230, 11235, 11242, 11254, 11258, 11271, 11272, 11276, 11279,
2153 11287, 11292, 11319, 11332, 11333, 11387, 11389, 11390, 11394, 11397,
2154 11410, 11438, 11449, 11470, 11471, 11520, 11537, 11538, 11571
2156 * New interfaces: pthread_getname_np, pthread_setname_np
2158 * New Linux interface: recvmmsg
2160 * STT_GNU_IFUNC implemented for Sparc by David Miller.
2162 * The dynamic linker now recognizes supported ABI versions from the
2163 EI_ABIVERSION field in the ELF header.
2164 Implemented by Ulrich Drepper.
2166 * New NIS mode selector ADJUNCT_AS_SHADOW. The passwd.adjunct.byname table
2167 will not be used to fill in password fields in the passwd.byname replies.
2168 Instead it is used to synthesize the shadow.byname table, should it be
2169 missing. This is a useful mode in some installations involving Solaris.
2170 Implemented by Ulrich Drepper.
2172 * New locales: kok_IN, sq_MK, cv_RU
2176 * The following bugs are resolved with this release:
2178 3270, 7094, 9924, 9986, 10011, 10085, 10107, 10159, 10162, 10166, 10183,
2179 10195, 10196, 10200, 10203, 10207, 10211, 10213, 10217, 10221, 10229,
2180 10262, 10286, 10312, 10315, 10319, 10349, 10360, 10391, 10402, 10416,
2181 10418, 10422, 10425, 10446, 10448, 10452, 10540, 10553, 10560, 10564,
2182 10609, 10643, 10692, 10713, 10717, 10730, 10731, 10742, 10780, 10784,
2183 10789, 10817, 10823, 10840, 10847
2185 * New interfaces: execvpe, pthread_sigqueue, mkstemps, mkstemps64, mkostemps,
2187 Implemented by Ulrich Drepper.
2189 * Checking version of longjmp added that fails if an uninitialized stack
2190 frame would be created. Implemented by Ulrich Drepper.
2192 * STT_GNU_IFUNC is now supported in static executables.
2193 Implemented by H.J. Lu.
2195 * STT_GNU_IFUNC implemented for PPC by Alan Modra.
2197 * New optimized string functions for x86-64: strstr, strcasestr, memcmp,
2198 strcspn, strpbrk, strspn, strcpy, stpcpy, strncpy, strcmp (SSE2, SSE4.2),
2199 strncmp (SSE2, SSE4.2), strchr (SSE4.2), strrchr (SSE4.2).
2200 Contributed by H.J. Lu.
2202 strlen, rawmemchr, strcmp (SSSE3), strncmp (SSSE3).
2203 Implemented by Ulrich Drepper.
2205 * New optimized string functions for x86: strlen, strcspn, strspn, strpbrk,
2207 Contributed by H.J. Lu.
2209 * Support for fma instruction in AVX on x86-64.
2210 Implemented by H.J. Lu and Ulrich Drepper.
2212 * AVX support in x86-64 auditing support in ld.so.
2213 Implemented by H.J. Lu.
2215 * STB_GNU_UNIQUE support added.
2216 Implemented by Ulrich Drepper.
2218 * Implement second fallback mode for optimized DNS lookup for even more
2219 broken environments. If two requests from the same port are not
2220 handled correctly close the socket and open a new one before sending
2221 the second request. The 'single-request-reopen' option in /etc/resolv.conf
2222 can be used to select this mode right away, instead of rediscovering the
2223 necessity is every process again.
2224 Implemented by Ulrich Drepper.
2226 * New resolver flag RES_USE_DNSSEC to enable use of verified lookup.
2227 Implemented by Adam Tkac.
2229 * Optimized iconv conversions for S390x.
2230 Implemented by Andreas Krebbel.
2232 * Using condvars with PI mutexes is now more efficient due to kernel
2233 support for requeueing to PI futexes. NPTL support added for x86-64.
2234 Implemented by Ulrich Drepper.
2236 * New locales: ps_AF, my_MM
2240 * The following bugs are resolved with this release:
2242 697, 5381, 5807, 6411, 6545, 7040, 7058, 7067, 7080, 7083, 7095, 7098,
2243 9677, 9694, 9697, 9701, 9704, 9705, 9706, 9720, 9726, 9730, 9733, 9736,
2244 9741, 9750, 9753, 9759, 9781, 9791, 9793, 9823, 9833, 9844, 9880, 9881,
2245 9891, 9893, 9895, 9913, 9916, 9920, 9948, 9955, 9957, 9963, 9985, 10052,
2246 10069, 10086, 10087, 10090, 10092, 10093, 10100, 10118, 10128
2248 * New interfaces: preadv, preadv64, pwritev, pwritev64, malloc_info
2249 Implemented by Ulrich Drepper.
2251 * New Linux interfaces: accept4, fallocate, fallocate64.
2252 Implemented by Ulrich Drepper.
2254 * Correct declarations of string function when used in C++ code. This
2255 could lead to compile errors for invalid C++ code.
2257 * XPG7/POSIX 2008 compilation environment. Many GNU-specific functions are
2260 * New POSIX 2008 interface: psiginfo
2261 Implemented by Ulrich Drepper.
2263 * New ISO C++1x interfaces: quick_exit, at_quick_exit
2264 Implemented by Ulrich Drepper.
2266 * Support for selecting between multiple function definitions at runtime
2267 using STT_GNU_IFUNC symbols. Implemented by Ulrich Drepper.
2269 * The libcrypt library can now use the hash function implementations in
2270 NSS. Implemented by Ulrich Drepper.
2272 * The malloc implementation can be compiled to be less memory efficient
2273 but higher performing in multi-threaded programs.
2274 Implemented by Ulrich Drepper.
2276 * New locales: nan_TW@latin, ks_IN
2278 * Faster strlen, strchr, strchrnul, strrchr, memchr, and rawmemchr for x86-64.
2279 Implemented by Ulrich Drepper.
2281 * Extended printf hook support. It is possible to use user-defined types
2282 and extend existing format specifiers.
2283 Implemented by Ulrich Drepper.
2285 * Handling for group shadow files has been added.
2286 Implemented by Ulrich Drepper.
2288 * DNS IPv4-IPv6 parallel lookup now deals better with broken DNS
2289 servers (the case, e.g., for some people using the built-in DNS
2290 server in ADSL modems/routers). There is a once-per-process timeout
2291 in case of a broken server. To avoid it, users can run nscd or put
2292 'options single-request' in /etc/resolv.conf.
2293 Implemented by Ulrich Drepper.
2297 * The following bugs are resolved with this release:
2299 3406, 5209, 5210, 5381, 5794, 5814, 5911, 6428, 6438, 6442, 6447, 6461,
2300 6472, 6505, 6544, 6589, 6612, 6634, 6653, 6654, 6657, 6698, 6712, 6713,
2301 6719, 6723, 6724, 6740, 6763, 6771, 6790, 6791, 6817, 6824, 6839, 6843,
2302 6845, 6856, 6857, 6860, 6867, 6875, 6919, 6920, 6942, 6947, 6955, 6966,
2303 6968, 6974, 6980, 6995, 7008, 7009, 7029
2305 * Unified lookup for getaddrinfo: IPv4 and IPv6 addresses are now looked
2306 up at the same time. Implemented by Ulrich Drepper.
2308 * TLS descriptors for LD and GD on x86 and x86-64.
2309 Implemented by Alexandre Oliva.
2311 * getaddrinfo now handles DCCP and UDPlite.
2312 Implemented by Ulrich Drepper.
2314 * New fixed-size conversion macros: htobe16, htole16, be16toh, le16toh,
2315 htobe32, htole32, be32toh, le32toh, htobe64, htole64, be64toh, le64toh.
2316 Implemented by Ulrich Drepper.
2318 * New implementation of memmem, strstr, and strcasestr which is O(n).
2319 Implemented by Eric Blake.
2321 * New Linux interfaces: inotify_init1, dup3, epoll_create1, pipe2
2323 * Implement "e" option for popen to open file descriptor with the
2324 close-on-exec flag set. Implemented by Ulrich Drepper.
2326 * Implement "b" mode for fmemopen. In this mode writes writes don't
2327 implicitly add a NUL byte and seeks from the end of the buffer really
2328 use the buffer end, not the string length as the basis.
2329 Implemented by Ulrich Drepper.
2331 * Many functions, exported and internal, now atomically set the close-on-exec
2332 flag when run on a sufficiently new kernel. Implemented by Ulrich Drepper.
2334 * Sorting rules for some Indian languages (Kannada, Gurumukhi, Telugu,
2336 Implemented by Pravin Satpute.
2338 * New locales: sd_IN, sd_IN@devanagari, ks_IN@devanagari, ht_HT, en_AG, nl_AW.
2342 * The following bugs are resolved with this release:
2344 2549, 3112, 4314, 4407, 4997, 5012, 5040, 5112, 5204, 5208, 5209, 5220,
2345 5222, 5224, 5225, 5237, 5238, 5240, 5245, 5277, 5346, 5375, 5378, 5382,
2346 5424, 5427, 5428, 5435, 5436, 5439, 5441, 5442, 5443, 5451, 5452, 5454,
2347 5455, 5463, 5464, 5465, 5475, 5477, 5478, 5520, 5541, 5545, 5553, 5600,
2348 5602, 5607, 5614, 5627, 5628, 5736, 5737, 5741, 5753, 5760, 5762, 5768,
2349 5774, 5777, 5778, 5779, 5786, 5790, 5818, 5854, 5857, 5903, 5939, 5979,
2350 5983, 5995, 5998, 6004, 6007, 6020, 6021, 6024, 6040, 6042
2352 * New locales: bo_CN, bo_IN, shs_CA.
2354 * New encoding: HP-ROMAN9, HP-GREEK8, HP-THAI8, HP-TURKISH8.
2356 * Sorting rules for some Indian languages (Devanagari and Gujarati).
2357 Implemented by Pravin Satpute.
2359 * IPV6 addresses in /etc/resolv.conf can now have a scope ID
2361 * nscd caches now all timeouts for DNS entries
2362 Implemented by Ulrich Drepper.
2364 * nscd is more efficient and wakes up less often.
2365 Implemented by Ulrich Drepper.
2367 * More checking functions: asprintf, dprintf, obstack_printf, vasprintf,
2368 vdprintf, and obstack_vprintf.
2369 Implemented by Jakub Jelinek.
2371 * Faster memset for x86-64.
2372 Implemented by Harsha Jagasia and H.J. Lu.
2374 * Faster memcpy on x86.
2375 Implemented by Ulrich Drepper.
2377 * ARG_MAX is not anymore constant on Linux. Use sysconf(_SC_ARG_MAX).
2378 Implemented by Ulrich Drepper.
2380 * Faster sqrt and sqrtf implemention for some PPC variants.
2381 Implemented by Steven Munroe.
2385 * The following bugs are resolved with this release:
2387 4125, 4126, 4178, 4359, 4407, 4512, 4514, 4525, 4554, 4556, 4557, 4566,
2388 4582, 4586, 4588, 4599, 4610, 4647, 4702, 4705, 4726, 4745, 4772, 4773,
2389 4775, 4776, 4792, 4813, 4814, 4816, 4833, 4858, 4860, 4896, 4905, 4925,
2390 4936, 4937, 4938, 4941, 4946, 4963, 4972, 5010, 5028, 5043, 5058, 5063,
2391 5071, 5103, 5104, 5112, 5113, 5184, 5186
2393 * More checking functions: fread, fread_unlocked, open*, mq_open.
2394 Implemented by Jakub Jelinek and Ulrich Drepper.
2396 * Extend fortification to C++. Implemented by Jakub Jelinek.
2398 * Implement 'm' modifier for scanf. Add stricter C99/SUS compliance
2399 by not recognizing 'a' as a modifier when those specs are requested.
2400 Implemented by Jakub Jelinek.
2402 * PPC optimizations to math and string functions.
2403 Implemented by Steven Munroe.
2405 * New interfaces: mkostemp, mkostemp64. Like mkstemp* but allow additional
2406 options to be passed. Implemented by Ulrich Drepper.
2408 * More CPU set manipulation functions. Implemented by Ulrich Drepper.
2410 * New Linux interfaces: signalfd, eventfd, eventfd_read, and eventfd_write.
2411 Implemented by Ulrich Drepper.
2413 * Handle private futexes in the NPTL implementation.
2414 Implemented by Jakub Jelinek and Ulrich Drepper.
2416 * Add support for O_CLOEXEC. Implement in Hurd. Use throughout libc.
2417 Implemented by Roland McGrath and Ulrich Drepper.
2419 * Linux/x86-64 vDSO support. Implemented by Ulrich Drepper.
2421 * SHA-256 and SHA-512 based password encryption.
2422 Implemented by Ulrich Drepper.
2424 * New locales: ber_DZ, ber_MA, en_NG, fil_PH, fur_IT, fy_DE, ha_NG, ig_NG,
2425 ik_CA, iu_CA, li_BE, li_NL, nds_DE, nds_NL, pap_AN, sc_IT, tk_TM, ug_CN,
2428 + New iconv modules: MAC-CENTRALEUROPE, ISO-8859-9E, KOI8-RU.
2429 Implemented by Ulrich Drepper.
2433 * The following bugs are resolved with this release:
2435 3156, 3213, 3285, 3291, 3306, 3313, 3320, 3322, 3325, 3326, 3334, 3348,
2436 3352, 3363, 3369, 3426, 3427, 3429, 3451, 3458, 3465, 3480, 3483, 3493,
2437 3514, 3515, 3559, 3632, 3664, 3673, 3674, 3745, 3747, 3818, 3840, 3842,
2438 3851, 3855, 3884, 3885, 3902, 3905, 3919, 3944, 3954, 3955, 3957, 3991,
2439 3995, 3996, 4024, 4040, 4069, 4070, 4074, 4076, 4096, 4101, 4102, 4114,
2440 4130, 4131, 4181, 4276, 4306, 4342, 4344, 4349, 4364, 4368, 4381, 4392,
2441 4403, 4405, 4406, 4411, 4438, 4439, 4455, 4456, 4465, 4512, 4514, 4586,
2444 * New Linux interfaces: epoll_pwait, sched_getcpu.
2446 * New generic interfaces: strerror_l.
2448 * nscd can now cache the services database. Implemented by Ulrich Drepper.
2452 * The following bugs are resolved with this release:
2454 39, 68, 192, 352, 388, 531, 935, 1006, 1201, 1203, 1386, 1782, 1783, 1784,
2455 1785, 1786, 1787, 1951, 1974, 1996, 2072, 2098, 2125, 2134, 2158, 2182,
2456 2349, 2376, 2386, 2389, 2415, 2418, 2420, 2423, 2450, 2451, 2466, 2472,
2457 2473, 2477, 2498, 2499, 2501, 2502, 2505, 2507, 2508, 2509, 2517, 2526,
2458 2569, 2571, 2592, 2611, 2625, 2632, 2644, 2662, 2680, 2683, 2684, 2693,
2459 2695, 2703, 2734, 2751, 2764, 2766, 2775, 2792, 2821, 2823, 2832, 2841,
2460 2843, 2883, 2892, 2908, 2914, 2926, 2961, 2978, 2980, 2987, 2997, 2998,
2461 3013, 3018, 3034, 3040, 3044, 3123, 3124, 3137, 3138, 3143, 3155, 3189,
2462 3225, 3251, 3252, 3253, 3273
2464 * For Linux, the sorting of addresses returned by getaddrinfo now also
2465 handles rules 3, 4, and 7 from RFC 3484. I.e., all rules are handled.
2466 Implemented by Ulrich Drepper.
2468 * Allow system admin to configure getaddrinfo with the /etc/gai.conf file.
2469 Implemented by Ulrich Drepper.
2471 * New Linux interfaces: splice, tee, sync_file_range, vmsplice.
2473 * New iconv module for MIK. Contributed by Alexander Shopov.
2475 * For sites with broken group and/or passwd database, the auto-propagate
2476 option of nscd can prevent creating ID lookup entries from the results
2477 of a name lookup and vice versa. This usually is no problem but some
2478 site might have problems with the default behavior.
2479 Implemented by Ulrich Drepper.
2481 * Iterating over entire database in NIS can be slow. With the
2482 SETENT_BATCH_READ option in /etc/default/nss a system admin can decide
2483 to trade time for memory. The entire database will be read at once.
2484 Implemented by Ulrich Drepper.
2486 * The interfaces introduced in RFC 3542 have been implemented by
2489 * Support for the new ELF hash table format was added by Ulrich Drepper.
2491 * Support for priority inheritance mutexes added by Jakub Jelinek and
2494 * Support for priority protected mutexes added by Jakub Jelinek.
2496 * New locales: nr_ZA, pa_PK, ca_AD, ca_FR, ca_IT, el_CY, tr_CY, as_IN,
2497 or_IN, csb_PL, fy_NL, sr_ME.
2501 * More overflow detection functions.
2503 * New iconv converters for IBM1025, IBM1122, IBM1137, IBM1153,
2504 IBM1154, IBM1155, IBM1156, IBM1157, and IBM1158 contributed by Jiro Sekiba.
2506 More converters for IBM803, IBM901, IBM902, IBM921, IBM1008, IBM1097,
2507 IBM1112, IBM1123, IBM1130, IBM1140, IBM1141, IBM1142, IBM1143, IBM1144,
2508 IBM1145, IBM1146, IBM1147, IBM1148, IBM1149, IBM1166, IBM1167, IBM4517,
2509 IBM4899, IBM4909, IBM4971, IBM5347, IBM9030, IBM9066, IBM9448, IBM12712,
2510 IBM16804, IBM1364, IBM1371, IBM1388, IBM1390, and IBM1399 contributed
2511 by Masahide Washizawa.
2513 * It is now possible to install audit libraries for the dynamic linker using
2514 LD_AUDIT. Implemented by Ulrich Drepper.
2516 * The LinuxThreads add-on, providing pthreads on Linux 2.4 kernels, is no
2517 longer supported. The new NPTL implementation requires Linux 2.6 kernels.
2518 For a libc and libpthread that works well on Linux 2.4 kernels, we
2519 recommend using the stable 2.3 branch.
2521 * The new function open_wmemstream acts like open_memstream,
2522 but uses a wchar_t wide character buffer.
2524 * The new function ppoll is an improved version of poll, similar to pselect.
2526 * New interfaces: fdopendir, openat, fstatat, fchmodat, fchownat,
2527 futimesat, faccessat, mkdirat, mkfifoat, mknodat,
2528 renameat, unlinkat, linkat, symlinkat, readlinkat.
2530 * New Linux kernel system calls: unshare,
2531 inotify_init, inotify_add_watch, inotify_rm_watch.
2533 * The euidaccess function is now also known by the alias eaccess,
2534 for compatibility with some other systems.
2536 * Timezone data updated to 2006b version.
2540 * The following bugs are resolved with this release:
2542 38, 253, 549, 622, 653, 721, 758, 851, 877, 915, 934, 955, 961,
2543 1016, 1037, 1076, 1079, 1080, 1081, 1082, 1083, 1084, 1085, 1086,
2544 1087, 1088, 1090, 1091, 1092, 1093, 1094, 1095, 1096, 1097, 1098,
2545 1099, 1100, 1101, 1102, 1103, 1104, 1105, 1106, 1107, 1108, 1109,
2546 1110, 1111, 1112, 1113, 1125, 1137, 1138, 1249, 1250, 1251, 1252,
2547 1253, 1254, 1350, 1358, 1394, 1438, 1498, 1534
2549 Visit <http://sources.redhat.com/bugzilla/> for the details of each bug.
2551 * As of this release, GCC 4 can be used to compile the C Library.
2553 * Timezone data updated to 2005m version.
2557 * The following bugs are resolved with this release:
2559 284, 592, 602, 626, 633, 640, 650, 661, 671, 681, 693, 700, 710, 719,
2560 722, 723, 725, 726, 727, 728, 729, 730, 731, 732, 733, 734, 735, 736,
2561 737, 738, 739, 740, 741, 742, 743, 744, 745, 765, 767, 768, 769, 776,
2562 777, 787, 821, 822, 823, 825
2564 Visit <http://sources.redhat.com/bugzilla/> for the details of each bug.
2568 * Support for RFC 3678. Real implementations exist only for Linux so far.
2569 Implemented by Ulrich Drepper.
2571 * nscd can now cache entries persistently. Expiring entries are reloaded.
2572 For speedups the cache can be shared in memory with client processes.
2573 Implemented by Ulrich Drepper.
2575 * nscd can now perform SELinux checks.
2576 Implemented by Matthew Rickard <mjricka@epoch.ncsc.mil>.
2578 * getaddrinfo queries are now cached. Canonical name lookup is performed
2580 Implemented by Ulrich Drepper.
2582 * The nothrow function attribute is used when headers are used by gcc when
2583 compiling C code. This can avoid significant amounts of exception
2586 * The malloc functions perform more error checking and are stricter when
2587 it comes to reacting on errors. The default action is to terminate
2588 the process after showing an error message. Implemented by Ulrich Drepper.
2590 * Reverse lookups of IPv6 addresses does not use bit string or .ip6.int
2591 lookups anymore unless explicitly requested. Implemented by Ulrich Drepper.
2593 * Namespaces in ld.so are implemented. DSOs can be loaded in separate
2594 namespaces using the new function dlmopen(). This feature is of course,
2595 like most other dynamic loading functionality, not available in statically
2596 linked applications. Implemented by Ulrich Drepper.
2598 * Low-overhead boundary checking variants of string and some stdio functions
2599 were added. These are to be used in conjunction with a gcc patch by
2600 Jakub Jelinek which adds calls to these functions if possible.
2601 Implemented by Jakub Jelinek and Ulrich Drepper.
2603 * Old code for several operating systems and machine architectures that
2604 have not been in working condition in a long time have been removed from
2605 the main source tree maintained by the GNU C Library's maintainers.
2606 These files are now reside in the separate `ports' source module
2607 that is usable as an add-on when building the library.
2611 * New functions `dladdr1' and `dlinfo' in <dlfcn.h> provide more ways to
2612 interrogate the dynamic linker, compatible with the Solaris interface.
2614 * ELF thread-local storage support (TLS) now works on PowerPC and PowerPC64;
2615 implemented by Paul Mackerras, Steven Munroe, and Roland McGrath.
2617 * getifaddrs now uses the netlink interface on Linux to get its information.
2618 Implemented by Thorsten Kukuk.
2620 * getaddrinfo now implements AI_V4MAPPED, AI_ALL, and AI_ADDRCONF.
2621 Implemented by Ulrich Drepper.
2623 * support for non-executable stacks on x86 has been added. Changes mostly
2626 * regex is now much faster for multibyte locales. Changes by Jakub Jelinek
2629 * getaddrinfo now performs destination address selection according to
2634 * Thread-safe interfaces for many functions that access locale data
2635 were added in version 2.3, but these features were omitted from NEWS.
2636 Many functions have variants with an `_l' suffix that take a `locale_t'
2637 object as a parameter rather than consulting the current locale.
2638 The new functions `newlocale', `duplocale', and `freelocale' in <locale.h>
2639 create and maintain `locale_t' objects. Additionally, the new function
2640 `uselocale' sets "the current locale" (as used by functions not so
2641 parameterized) set for an individual thread. These features were added
2642 in version 2.3, implemented by Ulrich Drepper and Roland McGrath.
2644 * The functions getresuid, getresgid, setresuid, and setresgid, which
2645 have long been available on Linux, are now declared in <unistd.h>
2646 and are now also available on the Hurd.
2648 * ELF thread-local storage support (TLS) now works on x86-64.
2650 * The new dynamic string token $LIB is expanded in shared library names.
2651 This normally expands to lib, but on some 64-bit platforms to lib64 instead.
2653 * Aldy Hernandez contributed complete software floating point support for
2654 PowerPC machines with no FPU.
2656 * fexecve is implemented on Linux.
2658 * The `btowc' function should work at least twice as fast due to
2659 specialized callbacks in the iconv modules. Implemented by Bruno Haible.
2661 * With approriate thread add-ons cancelable functions are now implemented
2662 in libc.so as well. No need to call the function in libpthread. This
2663 change allowed to finally disable the incorrect and expensive handling
2664 of weak definition in ld.so.
2666 * Yet more PLT entries in libc.so have been removed. We finally arrived
2667 at the bare minimum. Startup times improved appropriately.
2669 * Support for the new Linux/x86 system call interface was added. The
2670 AT_SYSINFO auxiliary vector entry is recognized and handled.
2674 * Masahide Washizawa contributed iconv modules for IBM1163 and IBM1164
2677 * iconv (the program and the interface) now accepts empty names (excluding
2678 options like //TRANSLIT) to mean "use charset of current locale".
2680 * localedef can now transliterate characters in strings which are not in
2681 the provided charmap. The information from the input locale is used.
2683 * Prelinking support was added for ELF targets. This requires additional
2684 tools and recent versions of the GNU binutils. Contributed by Jakub Jelinek.
2686 * Read-only stdio streams now use mmap to speed up operation by eliminating
2687 copying and buffer underflows. To use add 'm' to the mode string of
2688 the fopen/fdopen/freopen call. Implemented by Ulrich Drepper.
2690 * The malloc functions were completely rewritten by Wolfram Gloger based
2691 on Doug Lea's malloc-2.7.0.c.
2693 * Isamu Hasegawa contributed a completely new and POSIX-conformant
2694 implementation of regex.
2696 * Bruno Haible upgraded the iconv and locale implementation to support
2699 * Contents of the LC_* and LANG environment variables in the CEN style are
2700 not recognized anymore. It never was used. Change by Ulrich Drepper.
2702 * The runtime (ld.so, libc, libpthread for Linux) now can handle the ELF
2703 thread-local storage (TLS) ABI on some platforms.
2704 Changes by Ulrich Drepper. SH support by Kaz Kojima.
2706 * Bruno Haible contributed iconv converters for ISO-2022-JP-3, SHIFT JIS-X0213,
2707 EUC-JISX0213, and TSCII.
2709 * New header <ifaddrs.h> with functions `getifaddrs' and `freeifaddrs':
2710 BSD-compatible interface for getting all network interface addresses.
2711 Implementation for IPv4 by Roland McGrath.
2713 * Loading of locale data is faster due to the introduction of a locale
2714 archive. Implemented by Roland McGrath and Ulrich Drepper.
2716 * Startup times are significantly reduced by not using exported functions
2717 inside the library itself. Changes by Jakub Jelinek, Roland McGrath,
2720 * Steven Munroe contributed a port to PowerPC64/Linux.
2724 * The Hurd now uses the GNU libio implementation of stdio rather than the
2725 old GNU stdio implementation, and uses a new ABI (libc.so.0.3).
2727 * The Hurd on x86 now has the `ioperm' function and <sys/io.h> header file
2728 with the same behavior as the Linux system call of the same name.
2732 * Stephen Moshier implemented log2, log10, powl and cbrtl for the
2733 128-bit long double format.
2735 * Masahide Washizawa contributed iconv modules for IBM1132, IBM1133, IBM1160,
2736 IBM1161, and IBM1162 charsets.
2738 * Andreas Jaeger contributed a port to x86-64/Linux.
2740 * Peter Bruin contributed a port to PowerPC/Hurd.
2742 * libc functions using I/O streams now can handle wide-oriented streams
2745 * optimizations in the dynamic linker. Binaries created by recent binutils
2746 versions start up quicker due to reduced time spent on relocations.
2748 * Support for use of gcc3 added by Jakub Jelinek and HJ Lu.
2752 * Stephen Moshier implemented cosh, expm1, log1p, acos, sinh, tanh,
2753 asinh, atanh, j0 for the 128-bit long double format.
2755 * Bruno Haible updated all the code handling Unicode in some form to
2756 support Unicode 3.1.
2758 * Speed of regex for single-byte locales is back to previous levels.
2759 Patch by Isamu Hasegawa.
2761 * Alpha, SPARC, and IA-64 now also using floating stacks.
2763 * Startup time of internationalized applications greatly improved through
2764 iconv cache. Use iconvconfig to generate the cache file.
2765 Contributed by Ulrich Drepper.
2767 * The IA-64 specific part of ld.so was rewritten to eliminate some pretty
2768 severe performance problems. Patch by David Mosberger.
2770 * The Hurd port got a lot more functionality like AIO, various stdio
2771 extensions, etc. Mainly done by Roland McGrath.
2773 * mtrace can now lookup symbols in shared libraries.
2777 * Intel's IA-64 math library is largely integrated. It provides fast and
2778 accurate implementatations for most basic and standard math functions
2779 in float, double, and long double format.
2781 * Stephen Moshier implemented j0, j1, jn, y0, y1, yn, lgamma, erf, erfc,
2782 and asin for the 96-bit long double format and asin, log, tan for the
2783 128-bit long double format.
2785 * The beginning of a last-bit accurate math library by IBM Haifa were added.
2786 The basic double functions exist today. Contributed by Abraham Ziv
2787 <ziv@il.ibm.com>, Moshe Olshansky <olshansk@il.ibm.com>, Ealan Henis
2788 <ealan@il.ibm.com>, and Anna Reitman <reitman@il.ibm.com>.
2790 * An asynchronous name lookup library was added. The interface is designed
2791 after POSIX AIO. The proposal was circulated beforehand to get comments.
2792 No negative ones came in. Implemented by Ulrich Drepper.
2794 * Port to S390/64bit contributed by Martin Schwidefsky
2795 <schwidefsky@de.ibm.com>.
2797 * David Mosberger <davidm@hpl.hp.com> implemented the setcontext family
2798 of functions for Linux/IA-64.
2800 * The RPC code is now thread safe. Threads can now use the same service
2801 of different services at the same time. Patch by Eric Norum
2802 <eric.norum@usask.ca> with some help by Ulrich Drepper.
2804 * Martin Schwidefsky <schwidefsky@de.ibm.com> implemented the setcontext
2805 family of functions for Linux/S390.
2807 * Ulrich Drepper <drepper@redhat.com> implemented the setcontext family
2808 of functions for Linux/x86.
2810 * Port to Linux/CRIS contributed by Axis Communications.
2814 * Lots of headers were cleaned up. Using the tool in the conform/ subdir
2815 we can now check for namespace violations and missing declarations. The
2816 result is that almost all headers are now Unix-compliant (as defined in
2817 the upcoming XPG6). The negative side is that some programs might need
2818 corrections, too, if they depend on the incorrect form of the headers in
2819 previous versions which defined too many symbols and included too many
2822 * regex now handles multibyte character sets correctly.
2823 Contributed by Isamu Hasegawa <isamu@yamato.ibm.com>.
2825 * iconv (the program) does now conform to the upcoming XPG6 and handles
2826 charmaps. Instead of the charset names the path of charmaps can be
2827 provided and the conversion happens based on this data.
2828 Contributed by Ulrich Drepper.
2830 * The locale program now provides detailed information about the installed
2835 only lists the names of the supported locales
2839 provides details such as country, language, and codeset name.
2840 Contributed by Ulrich Drepper.
2844 * The gencat program now parses the input file according to the charset
2845 selected by the LC_CTYPE category. This is important for stateful
2846 character sets. To make generating catalogs easier there is a way
2847 to overwrite the charset selected by the locale: before the first
2848 message or $ quote line the catalog can contain a line like
2850 $ codeset=ISO-8859-2
2852 to select the charset (ISO-8859-2 in this case).
2854 Implemented by Shinya Hanataka and Ulrich Drepper.
2856 * New codeset conversion modules: IBM-922 (Estonia PC codeset),
2857 IBM-1124 (Ukraine PC codeset), IBM-1129 (Vietnamese PC codeset).
2858 Contributed by Masahide Washizawa <washi@jp.ibm.com>.
2860 * Optimized string functions for Alpha ev6 and ev67 by Richard Henderson
2861 <rth@redhat.com> and Rick Gorton <rick.gorton@alpha-processor.com>.
2863 * The LANGUAGE environment variable is now ignored unless the locale is
2864 changed from the default "C" locale.
2866 * The usual bug fixes.
2870 * Greg McGary added runtime support for bounds checking using gcc's
2871 new -fbounded-pointers option. ix86 target is complete. PowerPC
2874 * Thorsten Kukuk added secure mode support to nscd.
2876 * The Berkeley db libraries have been removed.
2878 Related, the nss_db module is now in a separate package since it
2879 obviously requires a database library being available.
2881 * Wide character I/O streams implemented by Ulrich Drepper.
2883 * Functions from the extended socket API added by Ulrich Drepper.
2885 * Functions feenableexcept and fedisableexcept to control the
2886 behaviour of individual exceptions have been added by Andreas Jaeger.
2888 * ldconfig program added by Andreas Jaeger and Jakub Jelinek.
2890 * The resolver code has been updated from bind 8.2.3-T5B which supports
2891 threads. The integration was done by Andreas Jaeger, Adam D. Bradley,
2894 This change could in some situations effect backward compatibility. Since
2895 now `_res' is a thread-local instead of a global variable, modifying it
2896 in one thread does not have any effect in other threads.
2898 The resolver library was also extended to allow IPv6 as the transport
2899 protocol for the requests. This work was done by Stig Venaas.
2901 * Compatibility code for K&R C compilers has been removed from the
2902 header files. A ISO C compiler is needed to use the library
2903 (conforming to either C89 or C99 standard).
2905 * Complete rewrite of the localedef program to support multibyte character
2906 sets. Implement handling of ISO 14651 and ISO 14652. Rewrite strcoll,
2907 strxfrm, wcscoll, and wcsxfrm functions. Make isw*() functions work.
2908 Implemented by Ulrich Drepper.
2910 Bruno Haible significantly improved the generation and use of the data
2911 structures for the wide character tables.
2913 * Plural handling in gettext implemented by Ulrich Drepper.
2915 * The utmp daemon has been removed.
2917 * The port to MIPS-Linux has been finished by Andreas Jaeger.
2919 * A port to Hitachi SH3 and SH4 has been contributed by Kazumoto Kojima
2922 * POSIX clocks and timers implemented by Kaz Kylheku and Ulrich Drepper.
2924 * POSIX barriers implemented by Kaz Kylheku.
2926 * POSIX spawn function family implemented by Ulrich Drepper.
2928 * POSIX spinlocks are now available.
2930 * Timed wait functions for mutex, rwlock, and semaphores are implemented.
2932 * the configure option --enable-kernel=X.Y.Z allows to strip out
2933 compatibility for kernel versions before X.Y.Z. This is currently only
2934 implemented for Linux.
2936 * the sockaddr_in6 structure changed. The IPv6 working group added a new
2937 field sin6_scope_id. This means that all programs using IPv6 should be
2938 recompiled. Don't expect binary compatibility with previous glibc
2941 * various conversion modules for IBM character sets contributed by
2944 * IA-64 port by Jes Sorensen and HJ Lu.
2958 * New ISO C 9x function _Exit, imaxabs, and imaxdiv are added.
2960 * New xdr functions are added; some rpc functions are now 64bit clean.
2962 * Fixed a number of bugs and memory leaks (especially in NIS+ code).
2964 * Fixed known incompatibilities with glibc 2.0.
2966 * New functions lock64, strchrnul, rawmemchr, getutmp and getutmpx.
2968 * Optimized a number of functions (especially the ELF dynamic loader).
2970 * Update timezone data files.
2972 * lots of charmaps corrections
2974 * some new locale definitions and charmaps
2979 * Richard Henderson corrected size of struct timeval on Linux/Alpha to
2980 conform to POSIX member type requirements. Symbol versions have been
2981 adjusted as needed within the library, and for direct use by applications,
2982 but there is potential for problems if third-party libraries use
2983 struct timeval as part of their interface. This does not present
2984 a problem for X and other "essential" system libraries.
2986 * An additional locale model to support C++ Standard Library locale
2987 model and probably more was implemented by Ulrich Drepper.
2989 * Eric Youngdale and Ulrich Drepper implemented versioning of objects on
2992 * Miles Bader provided the `argp' function family to support hierachical
2993 command line argument parsing, layered on top of getopt.
2995 * strtod accepts new hexadecimal floating-point format from ISO C 9X.
2997 * printf has two new specifiers %a and %A to print hexadecimal flaoting-point
3000 * scanf recognizes the %a and %A format for scanning floating point numbers.
3002 * the new headers <stdint.h> and <inttypes.h> from ISO C 9X provides
3003 information and interfaces for the available integer types.
3005 * about 130 new math functions were added to implement the ISO C9x math
3008 * the new header <complex.h> contains definitions of the complex math
3009 functions from ISO C 9X.
3011 * the new header <tgmath.h> defines generic macros to use complex or
3012 real valued functions.
3014 * Thorsten Kukuk provided an implementation for NIS+, securelevel 0, 1 and 2.
3016 * Andreas Jaeger provided a test suite for the math library.
3018 * Mark Kettenis implemented the utmpx interface and an utmp daemon.
3020 * Ulrich Drepper added character set conversion functions (iconv).
3022 * Optimized string functions have been added.
3024 * The localedata addon is now part of glibc.
3026 * An implementation of profiling shared libraries was added by Ulrich Drepper.
3028 * Thorsten Kukuk and Ulrich Drepper provided an implementation for a caching
3029 daemon for NSS (nscd).
3031 Missing a better place here are some numbers on improvements. Under
3032 Linux 2.1.125 un-tar-ing the kernel sources takes
3036 using local files 12.19s 6.88s 22.91s
3038 using NIS 13.92s 8.91s 26.34s
3040 using NIS & nscd 10.37s 7.34s 25.30s
3042 using NIS+ 27.57s 30.37s 640.46s
3044 using NIS+ & nscd 10.25s 7.83s 26.51s
3046 using NIS & old nscd [1] 13.83s 8.32s 29.60s
3048 Keep in mind that non-namelookup related operations dominate above times.
3049 It was just a common complain that using NIS+ unpacking the kernel is
3052 [1] The old nscd implementation is not available anymore since it was
3053 distributed with glibc up to version 2.0.98 and thus is now replaced.
3055 * Tim Waugh provided an implementation of the POSIX.2 wordexp function family.
3057 * Mark Kettenis provided a Hesiod NSS module.
3059 * The ELF dynamic loader knows how to process dynamic string tokens ($ORIGIN
3060 and $PLATFORM) in RPATHs and similar strings (Ulrich Drepper).
3062 * rcmd can now handle netgroups (Dick Streefland).
3064 * A port to the ARM was contributed by Phil Blundell, Pat Beirne and Scott
3067 * Support for the IPv6 protocol has been added to the socket API, as per the
3068 latest draft standards.
3070 * Support for Linux 2.2 has been added.
3072 * Interface changes relative to the latest 2.0.x release:
3073 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
3074 addseverity NEW: Unix98
3075 alphasort64 NEW: LFS
3076 argp_err_exit_status NEW: argp, GNU ext
3077 argp_error NEW: argp, GNU ext
3078 argp_failure NEW: argp, GNU ext
3079 argp_help NEW: argp, GNU ext
3080 argp_parse NEW: argp, GNU ext
3081 argp_program_bug_address NEW: argp, GNU ext
3082 argp_program_version NEW: argp, GNU ext
3083 argp_program_version_hook NEW: argp, GNU ext
3084 argp_state_help NEW: argp, GNU ext
3085 argp_usage NEW: argp, GNU ext
3086 authdes_create NEW: Secure RPC
3087 authdes_getucred NEW: Secure RPC
3088 authdes_pk_create NEW: Secure RPC
3089 backtrace NEW: GNU ext.
3090 backtrace_symbols NEW: GNU ext.
3091 backtrace_symbols_fd NEW: GNU ext.
3093 cacosf NEW: ISO C 9x
3094 cacosh NEW: ISO C 9x
3095 cacoshf NEW: ISO C 9x
3096 cacoshl NEW: ISO C 9x
3097 cacosl NEW: ISO C 9x
3104 casinf NEW: ISO C 9x
3105 casinh NEW: ISO C 9x
3106 casinhf NEW: ISO C 9x
3107 casinhl NEW: ISO C 9x
3108 casinl NEW: ISO C 9x
3110 catanf NEW: ISO C 9x
3111 catanh NEW: ISO C 9x
3112 catanhf NEW: ISO C 9x
3113 catanhl NEW: ISO C 9x
3114 catanl NEW: ISO C 9x
3115 cbc_crypt NEW: Secure RPC
3119 ccoshf NEW: ISO C 9x
3120 ccoshl NEW: ISO C 9x
3126 cimagf NEW: ISO C 9x
3127 cimagl NEW: ISO C 9x
3128 clearerr_locked REMOVED
3129 clntunix_create NEW: sunrpc ext
3131 clog10 NEW: ISO C 9x
3132 clog10f NEW: ISO C 9x
3133 clog10l NEW: ISO C 9x
3143 cprojf NEW: ISO C 9x
3144 cprojl NEW: ISO C 9x
3146 crealf NEW: ISO C 9x
3147 creall NEW: ISO C 9x
3152 csinhf NEW: ISO C 9x
3153 csinhl NEW: ISO C 9x
3156 csqrtf NEW: ISO C 9x
3157 csqrtl NEW: ISO C 9x
3161 ctanhf NEW: ISO C 9x
3162 ctanhl NEW: ISO C 9x
3164 des_setparity NEW: Secure RPC
3165 ecb_crypt NEW: Secure RPC
3166 endutxent NEW: Unix98
3168 exp10f NEW: ISO C 9x
3169 exp10l NEW: ISO C 9x
3173 fattach NEW: STREAMS
3174 fdetach NEW: STREAMS
3178 feclearexcept NEW: ISO C 9x
3179 fegetenv NEW: ISO C 9x
3180 fegetexceptflag NEW: ISO C 9x
3181 fegetround NEW: ISO C 9x
3182 feholdexcept NEW: ISO C 9x
3184 feraiseexcept NEW: ISO C 9x
3185 ferror_locked REMOVED
3186 fesetenv NEW: ISO C 9x
3187 fesetexceptflag NEW: ISO C 9x
3188 fesetround NEW: ISO C 9x
3189 fetestexcept NEW: ISO C 9x
3190 feupdateenv NEW: ISO C 9x
3191 fflush_locked REMOVED
3195 fgets_unlocked NEW: GNU ext.
3196 fileno_locked REMOVED
3208 fputc_locked REMOVED
3209 fputs_unlocked NEW: GNU ext.
3210 fread_unlocked NEW: GNU ext.
3215 fstatvfs NEW: Unix98
3219 ftruncate64 NEW: LFS
3221 fwrite_unlocked NEW: GNU ext.
3222 gai_strerror NEW: IPv6
3226 getchar_locked REMOVED
3228 getdate_err NEW: Unix98
3229 getdate_r NEW: GNU ext.
3231 getnameinfo NEW: IPv6
3232 getnetname NEW: Secure RPC
3233 getpmsg NEW: STREAMS
3234 getpt NEW: Unix98 PTY
3235 getrlimit64 NEW: LFS
3236 getutxent NEW: Unix98
3237 getutxid NEW: Unix98
3238 getutxline NEW: Unix98
3239 glob64 NEW: GNU ext.
3240 globfree64 NEW: GNU ext.
3241 gnu_get_libc_release NEW: GNU ext.
3242 gnu_get_libc_version NEW: GNU ext.
3243 grantpt NEW: Unix98 PTY
3244 host2netname NEW: Secure RPC
3246 iconv_close NEW: iconv
3247 iconv_open NEW: iconv
3248 if_freenameindex NEW: IPv6
3249 if_indextoname NEW: IPv6
3250 if_nameindex NEW: IPv6
3251 if_nametoindex NEW: IPv6
3252 in6addr_any NEW: IPv6
3253 in6addr_loopback NEW: IPv6
3254 inet6_isipv4mapped NEW: IPv6
3255 isastream NEW: STREAMS
3256 iswblank NEW: GNU ext.
3257 key_decryptsession NEW: Secure RPC
3258 key_decryptsession_pk NEW: Secure RPC
3259 key_encryptsession NEW: Secure RPC
3260 key_encryptsession_pk NEW: Secure RPC
3261 key_gendes NEW: Secure RPC
3262 key_get_conv NEW: Secure RPC
3263 key_secretkey_is_set NEW: Secure RPC
3264 key_setnet NEW: Secure RPC
3265 key_setsecret NEW: Secure RPC
3266 llrint NEW: ISO C 9x
3267 llrintf NEW: ISO C 9x
3268 llrintl NEW: ISO C 9x
3269 llround NEW: ISO C 9x
3270 llroundf NEW: ISO C 9x
3271 llroundl NEW: ISO C 9x
3276 lrintf NEW: ISO C 9x
3277 lrintl NEW: ISO C 9x
3278 lround NEW: ISO C 9x
3279 lroundf NEW: ISO C 9x
3280 lroundl NEW: ISO C 9x
3282 makecontext NEW: Unix98
3283 mempcpy NEW: GNU ext.
3286 modify_ldt NEW: kernel
3290 nearbyint NEW: ISO C 9x
3291 nearbyintf NEW: ISO C 9x
3292 nearbyintl NEW: ISO C 9x
3293 netname2host NEW: Secure RPC
3294 netname2user NEW: Secure RPC
3295 nexttoward NEW: ISO C 9x
3296 nexttowardf NEW: ISO C 9x
3297 nexttowardl NEW: ISO C 9x
3301 passwd2des NEW: Secure RPC
3303 pow10f NEW: GNU ext.
3304 pow10l NEW: GNU ext.
3307 printf_size NEW: GNU ext.
3308 printf_size_info NEW: GNU ext.
3309 profil_counter REMOVED
3310 pthread_mutexattr_getkind_np REPLACED
3311 pthread_mutexattr_setkind_np REPLACED
3312 ptsname NEW: Unix98 PTY
3313 ptsname_r NEW: Unix98 PTY
3315 putchar_locked REMOVED
3316 putgrent NEW: GNU ext.
3318 putpmsg NEW: STREAMS
3319 pututxline NEW: Unix98
3323 readdir64_r NEW: LFS
3324 remquo NEW: ISO C 9x
3325 remquof NEW: ISO C 9x
3326 remquol NEW: ISO C 9x
3328 roundf NEW: ISO C 9x
3329 roundl NEW: ISO C 9x
3331 scalbln NEW: ISO C 9x
3332 scalblnf NEW: ISO C 9x
3333 scalblnl NEW: ISO C 9x
3335 sendfile NEW: kernel
3336 setcontext NEW: Unix98
3337 setrlimit64 NEW: LFS
3338 setutxent NEW: Unix98
3340 sigignore NEW: Unix98
3341 sigqueue NEW: POSIX.1b
3342 sigrelse NEW: Unix98
3343 sigset NEW: POSIX.1b
3344 sigtimedwait NEW: POSIX.1b
3345 sigwaitinfo NEW: POSIX.1b
3346 sincos NEW: GNU ext.
3347 sincosf NEW: GNU ext.
3348 sincosl NEW: GNU ext.
3352 strcasestr NEW: GNU ext.
3353 strtoimax NEW: ISO C 9x
3354 strtoumax NEW: ISO C 9x
3355 strverscmp NEW: GNU ext.
3356 svcauthdes_stats NEW: Secure RPC
3357 svcunix_create NEW: sunrpc etx
3358 svcunixfd_create NEW: sunrpc ext
3359 swapcontext NEW: Unix98
3360 tcgetsid NEW: Unix98 PTY
3361 tdestroy NEW: GNU ext.
3362 tgamma NEW: ISO C 9x
3363 tgammaf NEW: ISO C 9x
3364 tgammal NEW: ISO C 9x
3368 truncf NEW: ISO C 9x
3369 truncl NEW: ISO C 9x
3371 unlockpt NEW: Unix98 PTY
3372 updwtmpx NEW: Unix98
3373 user2netname NEW: Secure RPC
3374 utmpxname NEW: Unix98
3375 versionsort NEW: GNU ext.
3376 versionsort64 NEW: GNU ext.
3378 wcscasecmp NEW: GNU ext.
3379 wcsncasecmp NEW: GNU ext.
3380 wcsnlen NEW: GNU ext.
3381 wcstoimax NEW: ISO C 9x
3382 wcstoll NEW: ISO C 9x
3383 wcstoull NEW: ISO C 9x
3384 wcstoumax NEW: ISO C 9x
3386 wordexp NEW: POSIX.2
3387 wordfree NEW: POSIX.2
3388 write_profiling REMOVED
3389 xdecrypt NEW: Secure RPC
3390 xdr_authdes_cred NEW: Secure RPC
3391 xdr_authdes_verf NEW: Secure RPC
3392 xdr_cryptkeyarg NEW: Secure RPC
3393 xdr_cryptkeyarg2 NEW: Secure RPC
3394 xdr_cryptkeyres NEW: Secure RPC
3395 xdr_getcredres NEW: Secure RPC
3396 xdr_key_netstarg NEW: Secure RPC
3397 xdr_key_netstres NEW: Secure RPC
3398 xdr_keybuf NEW: Secure RPC
3399 xdr_keystatus NEW: Secure RPC
3400 xdr_netnamestr NEW: Secure RPC
3401 xdr_sizeof NEW: Secure RPC
3402 xdr_unixcred NEW: sunrpc ext
3403 xencrypt NEW: Secure RPC
3404 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
3415 * inet_ntoa is thread-safe
3417 * updwtmp is moved from libutil to libc
3419 * rewrite of cbrt function
3421 * update of timezone data
3435 * add atoll function
3437 * fix complex problems in Berkeley DB code
3439 * fix math functions
3443 * fixed lots of header problems (especially Linux/GNU specific)
3445 * dynamic loader preserves all registers
3447 * Roland McGrath provided support for handling of auxiliary objects in
3448 the ELF dynamic loader.
3450 * support for parallel builds is improved
3454 * GNU extensions are no longer declared by default. To enable them you
3455 must define the macro `_GNU_SOURCE' in your program or compile with
3458 * The library has changed from using GNU ld symbol aliases to using weak
3459 symbols where available. The ELF object file format supports weak
3460 symbols; GNU ld also supports weak symbols in the a.out format. (There
3461 is also now support for other GNU ld extensions in ELF. Use the
3462 `--with-elf' option to configure to indicate you have ELF, and
3463 `--with-gnu-ld' if using GNU ld.) This change resulted in the deletion
3464 of many files which contained only symbol aliases, reducing the size of
3465 the source and the compiled library; many other files were renamed to
3466 less cryptic names previously occupied by the symbol alias files.
3467 There is a new header file <elf.h> for programs which operate on
3468 files in the ELF format.
3470 * Converted to Autoconf version 2, so `configure' has more options.
3471 Run `configure --help' to see the details.
3473 * The library can now be configured to build profiling, highly-optimized
3474 (but undebuggable), and/or shared libraries (ELF with GNU ld only). The
3475 `--enable-profile', `--enable-omitfp', and `--enable-shared' options to
3476 `configure' enable building these extra libraries. The shared library is
3477 built by default when using both ELF and GNU ld. When shared libraries
3478 are enabled, the new library `-ldl' is available for arbitrary run-time
3479 loading of shared objects; its interface is defined in <dlfcn.h>. The
3480 new header file <link.h> gives access to the internals of the run-time
3481 dynamic linker, `ld.so'. The shell script `ldd' is similar to the
3482 application of same name on other systems and it provides information
3483 about dynamically linked binaries.
3485 * The C library now provides the run-time support code for profiling
3486 executables compiled with `-pg'. Programs can control the profiling code
3487 through the interface in <sys/gmon.h>. The `gmon.out' files written by
3488 the GNU C library can be read only by GNU `gprof' (from GNU binutils);
3489 the support for this file format was contributed by David Mosberger-Tang.
3491 * The math code has been replaced with a math library based on fdlibm from
3492 Sun, and modified by JT Conklin and Ulrich Drepper with i387 support, by
3493 Ian Taylor with `float' functions and by Ulrich Drepper with `long double'
3494 functions. The math functions now reside in a separate library, so
3495 programs using them will need to use `-lm' their linking commands.
3497 * John C. Bowman contributed optimized ix87 assembler inline functions.
3499 * Ulrich Drepper has contributed support for an `/etc/nsswitch.conf'
3500 mechanism similar to that found in Solaris 2. This is now used for the
3501 group, passwd, hosts, networks, services, protocols, rpc, ethers,
3502 shadow, netgroup, publickey, and alias databases. The `nsswitch.conf'
3503 file controls what services are used for each individual database. This
3504 works by loading shared libraries with names specified in `nsswitch.conf',
3505 so service modules can be changed or added at any time without even
3506 relinking any program. Currently there are the file, db, and NIS based
3507 NSS services available.
3509 * The new functions `strtoq' and `strtouq' parse integer values from
3510 strings, like `strtol' and `strtoul', but they return `long long int' and
3511 `unsigned long long int' values, respectively (64-bit quantities).
3513 * The new functions `strtof' and `strtold' parse floating-point values from
3514 strings, like `strtod', but they return `float' and `long double' values,
3515 respectively (on some machines `double' and `long double' are the same).
3517 * Ulrich Drepper has contributed new implementations of the floating-point
3518 printing and reading code used in the `printf' family of functions and
3519 `strtod', `strtof', and `strtold'. These new functions are perfectly
3520 accurate, and much faster than the old ones.
3522 * The implementation of the POSIX locale model was completely rewritten by
3523 Ulrich Drepper. This includes the new programs `localedef' and `locale'
3524 to compile the POSIX locale definition.
3526 * The former dummy implementations of the strcoll and strxfrm function are
3527 now replaced by fully functional code contributed by Ulrich Drepper. The
3528 collation information comes from the POSIX locale definitions.
3530 * The new header <langinfo.h> defines an interface for accessing
3531 various locale-dependent data (using the locale chosen with `setlocale').
3533 * Ulrich Drepper has contributed a new suite of functions for operation on
3534 wide-character and multibyte-character strings, in <wchar.h>;
3535 and classification and case conversion of wide characters, in <wctype.h>.
3536 These new functions are conforming to the ISO C, Amendement 1 specification.
3538 * There is now a second implementation of the standard I/O library available.
3539 It comes from GNU libg++ as was written by Per Bothner, heavily modified
3540 by Hongjiu Lu and made thread safe by Ulrich Drepper.
3542 * You can now use positional parameter specifications in format strings
3543 for the `printf' and `scanf' families of functions. For example,
3544 `printf ("Number %2$d, Mr %1$s\n", "Jones", 6);'' prints
3545 ``Number 6, Mr Jones''. This is mainly useful when providing different
3546 format strings for different languages, whose grammars may dictate
3547 different orderings of the values being printed. To support this
3548 feature, the interface for `register_printf_handler' has changed; see
3549 the header file <printf.h> for details.
3551 * The `printf' and `scanf' families of functions now understand a new
3552 formatting flag for numeric conversions: the ' flag (e.g. %'d or %'f) says
3553 to group numbers as indicated by the locale; for `scanf' and friends, this
3554 says to accept as valid only a number with all the proper grouping
3555 separators in the right places. In the default "C" locale, numbers are
3556 not grouped; but locales for specific countries will define the usual
3557 conventions (i.e. separate thousands with `,' in the US locale).
3559 * The pgrp functions have been regularized, slightly incompatibly but much
3560 less confusingly. The core functions are now `getpgid' and `setpgid',
3561 which take arguments for the PID to operate on; the POSIX.1 `getpgrp' (no
3562 argument) and BSD `setpgrp' (identical to `setpgid') functions are
3563 provided for compatibility. There is no longer an incompatible `getpgrp'
3564 with an argument declared under _BSD_SOURCE; no BSD code uses it.
3566 * The new header file <fts.h> and suite of functions simplify programs that
3567 operate on directory trees. This code comes from 4.4 BSD.
3569 * The resolver code has been updated from the BIND 4.9.5-P1 release.
3570 Parts of the code were heavily modified by Ulrich Drepper to fit in the
3571 NSS scheme used in glibc.
3573 * There is a new malloc debugging hook `__memalign_hook'.
3575 * There are new typedefs `ushort' for `unsigned short int' and `uint' for
3576 `unsigned int' in <sys/types.h>. These are for compatibility only and
3577 their use is discouraged.
3579 * The `-lmcheck' library to enable standard malloc debugging hooks is now
3580 done differently, so that it works even without GNU ld.
3582 * New function `euidaccess' checks allowed access to a file like `access',
3583 but using the effective IDs instead of the real IDs.
3585 * The time zone data files have been updated for the latest and greatest
3586 local time conventions of the countries of the world.
3588 * The new function `dirfd' extracts the file descriptor used by a DIR stream;
3591 * The new functions `ecvt', `fcvt', and `gcvt' provide an obsolete interface
3592 for formatting floating-point numbers. They are provided only for
3593 compatibility; new programs should use `sprintf' instead. There are
3594 also equivalent function for the `long double' floating-point type and
3595 all functions also exist in a reentrant form.
3597 * The new auxiliary library `-lutil' from 4.4 BSD contains various
3598 functions for maintaining the login-record files (primarily of use to
3599 system programs such as `login'), and convenient functions for
3600 allocating and initializing a pseudo-terminal (pty) device.
3602 * Ulrich Drepper has contributed new support for System V style
3603 shared memory and IPC on systems that support it.
3605 * Ulrich Drepper has contributed several miscellaneous new functions found
3606 in System V: The `hsearch' family of functions provide an effective
3607 implementation of hash tables; `a64l' and `l64a' provide a very simple
3608 binary to ASCII mapping; `drand48' and friends provide a 48-bit random
3611 * Ulrich Drepper has contributed new reentrant counterparts for the
3612 `random' and `hsearch' families of functions; `random_r', `hsearch_r', etc.
3614 * Ulrich Drepper has contributed new, highly-optimized versions of several
3615 string functions for the i486/Pentium family of processors.
3617 * Ulrich Drepper has updated the Linux-specific code, based largely
3618 on work done in Hongjiu Lu's version of GNU libc for Linux.
3619 The GNU library now supports Linux versions 2.0.10 and later,
3620 using the ELF object file format (i[3456]86-*-linux).
3622 * Andreas Schwab has ported the C library to Linux/m68k (m68k-*-linux).
3624 * David Mosberger-Tang and Richard Henderson have ported the C library
3625 to Linux/Alpha (alpha-*-linux). Richard Henderson contributed the
3626 dynamic linking support for ELF/Alpha.
3628 * Richard Henderson contributed several Alpha optimized assembler function
3629 for arithmetic and string handling.
3631 * Ulrich Drepper has contributed a new set of message catalog functions to
3632 support multiple languages using the <libintl.h> interface, for use with
3633 his new package GNU gettext. Translation volunteers have contributed
3634 catalogs of the library's messages in Spanish, German, and Korean.
3636 * For compatibility with XPG4, Ulrich Drepper has contributed the `gencat'
3637 program and the `catgets' function for reading the catalog files it
3638 creates. (The <libintl.h> interface is preferred; we include the
3639 <nl_types.h> interface using `catgets' only for source compatibility with
3640 programs already written to use it.)
3642 * New header file <values.h> gives SVID-compatible names for <limits.h>
3645 * Various new macros, declarations, and small header files for compatibility
3648 * New function `group_member' is a convenient way to check if a process has
3649 a given effective group ID.
3651 * When using GCC 2.7 and later, the socket functions are now declared in a
3652 special way so that passing an argument of type `struct sockaddr_in *',
3653 `struct sockaddr_ns *', or `struct sockaddr_un *' instead of the generic
3654 `struct sockaddr *' type, does not generate a type-clash warning.
3656 * New function `error' declared in header file <error.h> is a convenient
3657 function for printing error messages and optionally exiting; this is the
3658 canonical function used in GNU programs. The new functions `err', `warn',
3659 and friends in header file <err.h> are the canonical 4.4 BSD interface for
3660 doing the same thing.
3662 * The <glob.h> interface has several new flags from 4.4 BSD that extend the
3663 POSIX.2 `glob' function to do ~ and {...} expansion.
3665 * New function `unsetenv' complements `setenv' for compatibility with 4.4 BSD.
3666 `clearenv' which is used in POSIX.9 is also available.
3668 * New function `getsid' returns session ID number on systems that support it.
3670 * We have incorporated the 4.4 BSD `db' library (version 1.85). New header
3671 files <db.h> and <mpool.h> provide a rich set of functions for several
3672 types of simple databases stored in memory and in files, and <ndbm.h> is
3673 an old `ndbm'-compatible interface using the `db' functions. Link with
3674 `-ldb' to get these functions.
3676 * New macro `strdupa' copies a string like `strdup', but uses local stack
3677 space from `alloca' instead of dynamic heap space from `malloc'.
3679 * New function `strnlen' is like `strlen' but searches only a given maximum
3680 number of characters for the null terminator. `stpncpy', `strndup' and
3681 `strndupa' are similar variants for the `stpcpy', `strdup' and `strdupa'
3684 * New function `statfs' in header <sys/statfs.h>.
3686 * The new <argz.h> and <envz.h> interfaces contributed by Miles Bader
3687 provide convenient functions for operating on blocks of null-terminated
3690 * A new suite of functions in <utmp.h> handle all the details of reading
3691 and writing the utmp file.
3693 * An implementation of the NIS/YP(tm) based NSS service was contributed by
3696 * Paul Eggert and Ulrich Drepper modified the `strftime' function to be
3697 completely POSIX compliant and also implemented the extended functionality
3698 to handle alternate digit representation and alternate era date formats.
3700 * Ulrich Drepper provided an implementation of the `strptime' function
3701 defined in XPG4.2 which transforms a string into a `struct tm' value.
3703 * Paul Eggert provided the tzselect shell script as part of the timezone
3704 code. The shell script makes it easy to select the correct timezone
3707 * The implementation of the malloc family of functions is completely replaced
3708 by a new implementation by Doug Lea with many improvements by Wolfram Gloger.
3709 The implementation uses the mmap function (if available) and it is
3710 optimized for the use in multi threaded programs.
3712 * Ulrich Drepper contributed a MD5 "encryption" for the crypt family of
3713 functions. This new functionality is usable by specifying a special
3714 salt string and it is compatible with implementation on *BSD systems.
3716 * Lots of functions from the XPG4.2 standard were added by Ulrich Drepper:
3717 `getsubopt' to handle second level command line options, `bsd_signal'
3718 to access BSD style `signal' functionality, the obsolete `regexp' style
3721 * the `lchown' function is available on system which support this
3724 * The implementation of the shadow password handling function was contributed
3727 * David Mosberger-Tang changed the SunRPC implementation to be 64bit safe.
3729 * POSIX.1g support was added. The <sys/select.h> header is available,
3730 `isfdtype' and `pselect' are implemented. Craig Metz contributed an
3731 implementation of `getaddrinfo'.
3735 * For cross-compilation you should now set `BUILD_CC' instead of `HOST_CC'.
3737 * New header file <fstab.h> and new functions `getfsspec', `getfsent' and
3738 friends, for parsing /etc/fstab. This code comes from 4.4 BSD.
3740 * The new function `daemon' from 4.4 BSD is useful for server programs that
3741 want to put themselves in the background.
3743 * Joel Sherrill has contributed support for several standalone boards that
3744 run without an operating system.
3746 * `printf', `scanf' and friends now accept a `q' type modifier for long
3747 long int as well as `ll'. Formats using these might be `%qu' or `%lld'.
3749 * All of the code taken from BSD (notably most of the math and networking
3750 routines) has been updated from the BSD 4.4-Lite release.
3752 * The resolver code has been updated from the BIND-4.9.3-BETA9 release.
3754 * The new functions `getdomainname' and `setdomainname' fetch or change the
3755 YP/NIS domain name. These are system calls which exist on systems which
3758 * The time zone data files have been updated for the latest international
3761 * The SunRPC programs `portmap' and `rpcinfo' are now installed in
3762 $(sbindir) (usually /usr/local/sbin) instead of $(bindir).
3766 * The C library now includes support for Sun RPC, from Sun's free
3767 RPCSRC-4.0 distribution. The `portmap', `rpcinfo', and `rpcgen' programs
3768 are included. (There is still no support for YP.)
3770 * Tom Quinn has contributed a port of the C library to SGI machines running
3771 Irix 4 (mips-sgi-irix4).
3773 * The new `lockf' function is a simplified interface to the locking
3774 facilities of `fcntl', included for compatibility.
3776 * New time functions `timegm', `timelocal', and `dysize' for compatibility.
3778 * New header file <sys/timeb.h> and new function `ftime' for compatibility.
3780 * New header files <poll.h> and <sys/poll.h> and new function `poll' for
3783 * The error message printed by `assert' for a failed assertion now includes
3784 the name of the program (if using GNU ld) and the name of the calling
3785 function (with versions of GCC that support this).
3787 * The `psignal' function is now declared in <signal.h>, not <stdio.h>.
3789 * The library now includes the <sys/mman.h> header file and memory
3790 management functions `mmap', `munmap', `mprotect', `msync', and
3791 `madvise', on systems that support those facilities.
3793 * The interface for `mcheck' has changed slightly: the function called to
3794 abort the program when an allocation inconsistency is detected now takes
3795 an argument that indicates the type of failure. The new function
3796 `mprobe' lets you request a consistency check for a particular block at
3797 any time (checks are normally done only when you call `free' or `realloc'
3800 * It is now possible to easily cross-compile the C library, building on one
3801 system a library to run on another machine and/or operating system. All
3802 you need to do is set the variable `HOST_CC' in `configparms' to the
3803 native compiler for programs to run on the machine you are building on (a
3804 few generator programs are used on Unix systems); set `CC' to the
3807 * The new function `fexecve' (only implemented on the GNU system) executes
3808 a program file given a file descriptor already open on the file.
3812 * Brendan Kehoe has contributed most of a port to the DEC Alpha
3813 running OSF/1 (alpha-dec-osf1). He says it is 75% complete.
3815 * You can set the variable `libprefix' in `configparms' to specify a prefix
3816 to be prepended to installed library files; this makes it easy to install
3817 the GNU C library to be linked as `-lgnuc' or whatever.
3819 * The new `stpncpy' is a cross between `stpcpy' and `strncpy': It
3820 copies a limited number of characters from a string, and returns the
3821 address of the last character written.
3823 * You no longer need to check for whether the installed `stddef.h' is
3824 compatible with the GNU C library. configure now checks for you.
3826 * You can now define a per-stream `fileno' function to convert the
3827 stream's cookie into an integral file descriptor.
3829 * ``malloc (0)'' no longer returns a null pointer. Instead, it
3830 allocates zero bytes of storage, and returns a unique pointer which
3831 you can pass to `realloc' or `free'. The behavior is undefined if
3832 you dereference this pointer.
3834 * The C library now runs on Sony NEWS m68k machines running either
3835 NewsOS 3 or NewsOS 4.
3837 * The new `syscall' function is a system-dependent primitive function
3838 for invoking system calls. It has the canonical behavior on Unix
3839 systems, including unreliable return values for some calls (such as
3840 `pipe', `fork' and `getppid').
3842 * The error code `EWOULDBLOCK' is now obsolete; it is always defined
3843 to `EAGAIN', which is the preferred name. On systems whose kernels
3844 use two distinct codes, the C library now translates EWOULDBLOCK to
3845 EAGAIN in every system call function.
3849 * The GNU C Library Reference Manual is now distributed with the library.
3850 `make dvi' will produce a DVI file of the printed manual.
3851 `make info' will produce Info files that you can read on line using C-h i
3852 in Emacs or the `info' program.
3853 Please send comments on the manual to bug-glibc-manual@gnu.org.
3855 * The library now supports SVR4 on i386s (i386-unknown-sysv4).
3857 * Brendan Kehoe has contributed a port to Sun SPARCs running Solaris 2.
3859 * Jason Merrill has contributed a port to the Sequent Symmetry running
3860 Dynix version 3 (i386-sequent-dynix).
3862 * The library has been ported to i386s running SCO 3.2.4 (also known as SCO
3863 ODT 2.0; i386-unknown-sco3.2.4) or SCO 3.2 (i386-unknown-sco3.2).
3865 * New function `memory_warnings' lets you arrange to get warnings when
3866 malloc is running out of memory to allocate, like Emacs gives you.
3868 * The C library now contains the relocating allocator used in Emacs 19 for
3869 its editing buffers. This allocator (ralloc) minimizes allocation
3870 overhead and fragmentation by moving allocated regions around whenever it
3871 needs to. You always refer to a ralloc'd region with a "handle" (a
3872 pointer to a pointer--an object of type `void **').
3874 * There is a new `printf' format: `%m' gives you the string corresponding
3875 to the error code in `errno'.
3877 * In `scanf' formats, you can now use `%as' or `%a[' to do the normal `%s'
3878 or `%[' conversion, but instead of filling in a fixed-sized buffer you
3879 pass, the `a' modifier says to fill in a `char **' you pass with a
3882 * The `fnmatch' function supports the new flag bits `FNM_LEADING_DIR' and
3883 `FNM_CASEFOLD'. `FNM_LEADING_DIR' lets a pattern like `foo*' match a
3884 name like `foo/bar'. `FNM_CASEFOLD' says to ignore case in matching.
3886 * `mkstemp' is a traditional Unix function to atomically create and open a
3887 uniquely-named temporary file.
3891 * The standard location for the file that says what the local timezone is
3892 has changed again. It is now `/usr/local/etc/localtime' (or more
3893 precisely, `${prefix}/etc/localtime') rather than `/etc/localtime'.
3895 * The distribution no longer contains any files with names longer than 14
3898 * `struct ttyent' has two new flag bits: TTY_TRUSTED and TTY_CONSOLE.
3899 These are set by the new `trusted' and `console' keywords in `/etc/ttys'.
3901 * New functions `ttyslot' and `syslog' from 4.4 BSD.
3905 * The configuration process has changed quite a bit. The `configure'
3906 script is now used just like the configuration scripts for other GNU
3907 packages. The `sysdeps' directory hierarchy is much rearranged.
3908 The file `INSTALL' explains the new scheme in detail.
3910 * The header files no longer need to be processed into ANSI C and
3911 traditional C versions. There is just one set of files to install, and
3912 it will work with ANSI or old C compilers (including `gcc -traditional').
3914 * Brendan Kehoe and Ian Lance Taylor have ported the library to the
3915 MIPS DECStation running Ultrix 4.
3917 * The Sun 4 startup code (crt0) can now properly load SunOS 4 shared libraries.
3918 Tom Quinn contributed the initial code. The GNU C library can NOT yet be
3919 made itself into a shared library.
3921 * Yet further improved support for the i386, running 4.3 BSD-like systems
3922 (such as Mach 3 with the Unix single-server), or System V.
3924 * New function `strncasecmp' to do case-insensitive string comparison
3925 with limited length.
3927 * New function `strsep' is a reentrant alternative to `strtok'.
3929 * New functions `scandir' and `alphasort' for searching directories.
3931 * New function `setenv' is a better interface to `putenv'.
3933 * Ian Lance Taylor has contributed an implementation of the SVID `ftw'
3934 function for traversing a directory tree.
3936 * The GNU obstack package is now also part of the C library.
3937 The new function `open_obstack_stream' creates a stdio stream that
3938 writes onto an obstack; `obstack_printf' and `obstack_vprintf' do
3939 formatted output directly to an obstack.
3941 * Miscellaneous new functions: reboot, nice, sigaltstack (4.4 BSD only),
3942 cfmakeraw, getusershell, getpass, swab, getttyent, seteuid, setegid.
3944 * `FNM_FILE_NAME' is another name for `FNM_PATHNAME', used with `fnmatch'.
3946 * The new functions `strfry' and `memfrob' do mysterious and wonderful
3947 things to your strings.
3949 * There are some new test programs: test-fseek, testmb, and testrand.
3951 * Some work has been done to begin porting the library to 4.4 BSD and Linux.
3952 These ports are not finished, but are a good starting place for really
3953 supporting those systems.
3955 * `/etc/localtime' is now the standard location for the file that says what
3956 the local timezone is, rather than `/usr/local/lib/zoneinfo/localtime'.
3957 This follows the general principle that `/etc' is the place for all local
3958 configuration files.
3960 * The C library header files now use `extern "C"' when used by the C++
3961 compiler, so the C library should now work with C++ code.
3963 * The header file <bstring.h> is gone. <string.h> now declares bcopy,
3964 bcmp, bzero, and ffs. (Update: nowadays these functions are declared
3967 * Mike Haertel (of GNU e?grep and malloc fame) has written a new sorting
3968 function which uses the `merge sort' algorithm, and is said to be
3969 significantly faster than the old GNU `qsort' function. Merge sort is
3970 now the standard `qsort' function. The new algorithm can require a lot
3971 of temporary storage; so, the old sorting function is called when the
3972 required storage is not available.
3974 * The C library now includes Michael Glad's Ultra Fast Crypt, which
3975 provides the Unix `crypt' function, plus some other entry points.
3977 * The code and header files taken from 4.4 BSD have been updated with the
3978 latest files released from Berkeley.
3980 ----------------------------------------------------------------------
3981 Copyright information:
3983 Copyright (C) 1992-2017 Free Software Foundation, Inc.
3985 Permission is granted to anyone to make or distribute verbatim copies
3986 of this document as received, in any medium, provided that the
3987 copyright notice and this permission notice are preserved,
3988 thus giving the recipient permission to redistribute in turn.
3990 Permission is granted to distribute modified versions
3991 of this document, or of portions of it,
3992 under the above conditions, provided also that they
3993 carry prominent notices stating who last changed them.
3996 version-control: never