1 GNU C Library NEWS -- history of user-visible changes.
2 Copyright (C) 1992-2016 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 * The pap_AN locale has been deleted. This has been deprecated for a long
11 time. It has been replaced by pap_AW & pap_CW, both of which have long
12 been included in previous releases.
14 * The readdir_r and readdir64_r functions have been deprecated. It is
15 recommended to use readdir and readdir64 instead.
17 Security related changes:
19 [Add security related changes here]
21 The following bugs are resolved with this release:
23 [The release manager will add the list generated by
24 scripts/list-fixed-bugs.py just before the release.]
28 * Unicode 8.0.0 Support: Character encoding, character type info, and
29 transliteration tables are all updated to Unicode 8.0.0, using new
30 and/or improved generator scripts contributed by Mike FABIAN (Red Hat).
31 These updates cause user visible changes, such as the fixes for bugs
34 * sched_setaffinity, pthread_setaffinity_np no longer attempt to guess the
35 kernel-internal CPU set size. This means that requests that change the
36 CPU affinity which failed before (for example, an all-ones CPU mask) will
37 now succeed. Applications that need to determine the effective CPU
38 affinities need to call sched_getaffinity or pthread_getaffinity_np after
39 setting it because the kernel can adjust it (and the previous size check
40 would not detect this in the majority of cases).
42 * The fts.h header can now be used with -D_FILE_OFFSET_BITS=64. With LFS
43 the following new symbols are used: fts64_children, fts64_close,
44 fts64_open, fts64_read and fts64_set.
46 * getaddrinfo now detects certain invalid responses on an internal netlink
47 socket. If such responses are received, an affected process will
48 terminate with an error message of "Unexpected error <number> on netlink
49 descriptor <number>" or "Unexpected netlink response of size <number> on
50 descriptor <number>". The most likely cause for these errors is a
51 multi-threaded application which erroneously closes and reuses the netlink
52 file descriptor while it is used by getaddrinfo.
54 * A defect in the malloc implementation, present since glibc 2.15 (2012) or
55 glibc 2.10 via --enable-experimental-malloc (2009), could result in the
56 unnecessary serialization of memory allocation requests across threads.
57 The defect is now corrected. Users should see a substantial increase in
58 the concurent throughput of allocation requests for applications which
59 trigger this bug. Affected applications typically create create and
60 destroy threads frequently. (Bug 19048 was reported and analyzed by
63 * There is now a --disable-timezone-tools configure option for disabling the
64 building and installing of the timezone related utilities (zic, zdump, and
65 tzselect). This is useful for people who build the timezone data and code
66 independent of the GNU C Library.
68 * The obsolete header <regexp.h> has been removed. Programs that require
69 this header must be updated to use <regex.h> instead.
71 * The obsolete functions bdflush, create_module, get_kernel_syms,
72 query_module and uselib are no longer available to newly linked binaries;
73 the header <sys/kdaemon.h> has been removed. These functions and header
74 were specific to systems using the Linux kernel and could not usefully be
75 used with the GNU C Library on systems with version 2.6 or later of the
78 * Optimized string, wcsmbs and memory functions for IBM z13.
79 Implemented by Stefan Liebler.
81 * Newly linked programs that define a variable called signgam will no longer
82 have it set by the lgamma, lgammaf and lgammal functions. Programs that
83 require signgam to be set by those functions must ensure that they use the
84 variable provided by the GNU C Library and declared in <math.h>, without
85 defining their own copy.
87 * The minimum GCC version that can be used to build this version of the GNU
88 C Library is GCC 4.7. Older GCC versions, and non-GNU compilers, can
89 still be used to compile programs using the GNU C Library.
91 Security related changes:
93 * An out-of-bounds value in a broken-out struct tm argument to strftime no
94 longer causes a crash. Reported by Adam Nielsen. (CVE-2015-8776)
96 * The LD_POINTER_GUARD environment variable can no longer be used to disable
97 the pointer guard feature. It is always enabled. Previously,
98 LD_POINTER_GUARD could be used to disable security hardening in binaries
99 running in privileged AT_SECURE mode. Reported by Hector Marco-Gisbert.
102 * An integer overflow in hcreate and hcreate_r could lead to an
103 out-of-bounds memory access. Reported by Szabolcs Nagy. (CVE-2015-8778)
105 * The catopen function no longer has unbounded stack usage. Reported by
108 * The nan, nanf and nanl functions no longer have unbounded stack usage
109 depending on the length of the string passed as an argument to the
110 functions. Reported by Joseph Myers. (CVE-2014-9761)
112 * A stack-based buffer overflow was found in libresolv when invoked from
113 libnss_dns, allowing specially crafted DNS responses to seize control
114 of execution flow in the DNS client. The buffer overflow occurs in
115 the functions send_dg (send datagram) and send_vc (send TCP) for the
116 NSS module libnss_dns.so.2 when calling getaddrinfo with AF_UNSPEC
117 family. The use of AF_UNSPEC triggers the low-level resolver code to
118 send out two parallel queries for A and AAAA. A mismanagement of the
119 buffers used for those queries could result in the response of a query
120 writing beyond the alloca allocated buffer created by
121 _nss_dns_gethostbyname4_r. Buffer management is simplified to remove
122 the overflow. Thanks to the Google Security Team and Red Hat for
123 reporting the security impact of this issue, and Robert Holiday of
124 Ciena for reporting the related bug 18665. (CVE-2015-7547)
126 The following bugs are resolved with this release:
128 [89] localedata: Locales nb_NO and nn_NO should transliterate æøå
129 [887] math: Math library function "logb" and "nextafter" inconsistent
130 [2542] math: Incorrect return from float gamma (-0X1.FA471547C2FE5P+1)
131 [2543] math: Incorrect return from float gamma (-0X1.9260DCP+1)
132 [2558] math: Incorrect return from double gamma (-0X1.FA471547C2FE5P+1)
133 [2898] libc: [improve] warning: the use of `mktemp' is dangerous, better
135 [4404] localedata: German translation of "Alarm clock" is misleading
136 [6799] math: nextafter() and nexttoward() doen't set errno on
137 overflow/underflow errors
138 [6803] math: scalb(), scalbln(), scalbn() do not set errno on
140 [10432] nis: _nss_nis_setnetgrent assertion failure
141 [11460] libc: fts has no LFS support
142 [12926] network: getaddrinfo()/make_request() may spin forever
143 [13065] nptl: Race condition in pthread barriers
144 [13690] nptl: pthread_mutex_unlock potentially cause invalid access
145 [14341] dynamic-link: Dynamic linker crash when DT_JMPREL and DT_REL{,A}
147 [14551] math: [ldbl-128ibm] strtold overflow handling for IBM long double
148 [14912] libc: Rename non-installed bits/*.h headers
149 [15002] libc: Avoid undefined behavior in posix_fallocate overflow check
150 [15367] math: Let gcc use __builtin_isinf
151 [15384] math: One constant fewer in ieee754/dbl-64/wordsize-64/s_finite.c
152 [15421] math: lgamma wrongly sets signgam for ISO C
153 [15470] math: [arm] On ARM llrintl() and llroundl() do not raise
154 FE_INVALID with argument out of range
155 [15491] math: [i386/x86_64] x86 nearbyint implementations wrongly clear
157 [15786] dynamic-link: ifunc resolver functions can smash function
159 [15918] math: Unnecessary check for equality in hypotf()
160 [16061] localedata: Review / update transliteration data
161 [16068] math: [i386/x86_64] x86 and x86_64 fesetenv exclude state they
163 [16141] time: strptime %z offset restriction
164 [16171] math: drem should be alias of remainder
165 [16296] math: fegetround is pure?
166 [16347] math: [ldbl-128ibm] ldbl-128/e_lgammal_r.c may not be suitable.
167 [16364] libc: sleep may leave SIGCHLD blocked on sync cancellation on
169 [16399] math: [mips] lrint / llrint / lround / llround missing exceptions
170 [16415] math: Clean up ldbl-128 / ldbl-128ibm expm1l for large positive
172 [16422] math: [powerpc] math-float, math-double failing llrint tests with
173 "Exception "Inexact" set" on ppc32
174 [16495] localedata: nl_NL: date_fmt: shuffle year/month around
175 [16517] math: Missing underflow exception from tanf/tan/tanl
176 [16519] math: Missing underflow exception from sinhf
177 [16520] math: Missing underflow exception from tanhf
178 [16521] math: Missing underflow exception from exp2
179 [16620] math: [ldbl-128ibm] exp10l spurious overflows / bad directed
181 [16734] stdio: fopen calls mmap to allocate its buffer
182 [16961] math: nan function incorrect handling of bad sequences
183 [16962] math: nan function unbounded stack allocation (CVE-2014-9761)
184 [16973] localedata: Fix lang_lib/lang_term as per ISO 639-2
185 [16985] locale: localedef: confusing error message when opening output
187 [17118] math: ctanh(INFINITY + 2 * I) returns incorrect value
188 [17197] locale: Redundant shift character in iconv conversion output at
190 [17243] libc: trunk/posix/execl.c:53: va_args problem ?
191 [17244] libc: trunk/sysdeps/unix/sysv/linux/semctl.c:116: va_args muxup ?
192 [17250] dynamic-link: static linking breaks nss loading
193 (getaddrinfo/getpwnam/etc...)
194 [17404] libc: atomic_exchange_rel lacking a barrier on MIPS16, GCC before
196 [17441] math: isnan() should use __builtin_isnan() in GCC
197 [17514] nptl: Assert failure unlocking ERRORCHECK mutex after timedlock
198 (related to lock elision)
199 [17787] manual: Exponent on page 324 of the PDF ends prematurely
200 [17886] time: strptime should be able to parse "Z" as a timezone with %z
201 [17887] time: strptime should be able to parse "+01:00" style timezones
202 [17905] libc: catopen() Multiple unbounded stack allocations
204 [18084] libc: backtrace (..., 0) dumps core on x86
205 [18086] libc: nice() sets errno to 0 on success
206 [18240] libc: hcreate, hcreate_r should fail with ENOMEM if element count
207 is too large (CVE-2015-8778)
208 [18251] dynamic-link: SONAME missing when audit modules provides path
209 [18265] libc: add attributes for wchar string and memory functions
210 [18370] math: csqrt missing underflows
211 [18421] libc: [hppa] read-only segment has dynamic relocations
212 [18472] libc: Obsolete syscall wrappers should be compat symbols
213 [18480] libc: hppa glibc miscompilation in sched_setaffinity()
214 [18491] localedata: Update tr_TR LC_CTYPE as part of Unicode updates
215 [18525] localedata: Remove locale timezone information
216 [18560] libc: [powerpc] spurious bits/ipc.h definitions
217 [18568] localedata: Update locale data to Unicode 8.0
218 [18589] locale: sort-test.sh fails at random
219 [18595] math: ctan, ctanh missing underflows
220 [18604] libc: assert macro-expands its argument
221 [18610] math: S390: fetestexcept() reports any exception if DXC-code
222 contains a vector instruction exception.
223 [18611] math: j1, jn missing errno setting on underflow
224 [18618] localedata: sync Chechen locale definitions with other *_RU
226 [18647] math: powf(-0x1.000002p0, 0x1p30) returns 0 instead of +inf
227 [18661] libc: Some x86-64 assembly codes don't align stack to 16 bytes
228 [18665] network: In send_dg, the recvfrom function is NOT always using the
229 buffer size of a newly created buffer (CVE-2015-7547)
230 [18674] libc: [i386] trunk/sysdeps/i386/tst-auditmod3b.c:84: possible
232 [18675] libc: fpathconf(_PC_NAME_MAX) fails against large filesystems for
234 [18681] libc: regexp.h is obsolete and buggy, and should be desupported
235 [18699] math: tilegx cproj() for various complex infinities does not yield
237 [18724] libc: Harden put*ent functions against data injection
238 [18743] nptl: PowerPC: findutils testcase fails with --enable-lock-elision
239 [18755] build: build errors with -DNDEBUG
240 [18757] stdio: fmemopen fails to set errno on failure
241 [18778] dynamic-link: ld.so crashes if failed dlopen causes libpthread to
243 [18781] libc: openat64 lacks O_LARGEFILE
244 [18787] libc: [hppa] sysdeps/unix/sysv/linux/hppa/bits/atomic.h:71:6:
245 error: can’t find a register in class ‘R1_REGS’ while reloading ‘asm’
246 [18789] math: [ldbl-128ibm] sinhl inaccurate near 0
247 [18790] math: [ldbl-128ibm] tanhl inaccurate
248 [18795] libc: stpncpy fortification misses buffer lengths that are
250 [18796] build: build fails for --disable-mathvec
251 [18803] math: hypot missing underflows
252 [18820] stdio: fmemopen may leak memory on failure
253 [18823] math: csqrt spurious underflows
254 [18824] math: fma spurious underflows
255 [18825] math: pow missing underflows
256 [18857] math: [ldbl-128ibm] nearbyintl wrongly uses signaling comparisons
257 [18868] nptl: pthread_barrier_init typo has in-theory-undefined behavior
258 [18870] build: sem_open.c fails to compile with missing symbol
260 [18872] stdio: Fix memory leak in printf_positional
261 [18873] libc: posix_fallocate overflow check ineffective
262 [18875] math: Excess precision leads incorrect libm
263 [18877] libc: arm: mmap offset regression
264 [18887] libc: memory corruption when using getmntent on blank lines
265 [18918] localedata: hu_HU: change time to HH:MM:SS format
266 [18921] libc: Regression: extraneous stat() and fstat() performed by
268 [18928] dynamic-link: LD_POINTER_GUARD is not ignored for privileged
269 binaries (CVE-2015-8777)
270 [18951] math: tgamma missing underflows
271 [18952] math: [ldbl-128/ldbl-128ibm] lgammal spurious "invalid", incorrect
273 [18953] localedata: lt_LT: change currency symbol to the euro
274 [18956] math: powf inaccuracy
275 [18961] math: [i386] exp missing underflows
276 [18966] math: [i386] exp10 missing underflows
277 [18967] math: math.h XSI POSIX namespace (gamma, isnan, scalb)
278 [18969] build: multiple string test failures due to missing locale
280 [18970] libc: Reference of pthread_setcancelstate in libc.a
281 [18977] math: float / long double Bessel functions not in XSI POSIX
282 [18980] math: i386 libm functions return with excess range and precision
283 [18981] math: i386 scalb*, ldexp return with excess range and precision
284 [18982] stdio: va_list and vprintf
285 [18985] time: Passing out of range data to strftime() causes a segfault
287 [19003] math: [x86_64] fma4 version of pow inappropriate contraction
288 [19007] libc: FAIL: elf/check-localplt with -z now and binutils 2.26
289 [19012] locale: iconv_open leaks memory on error path
290 [19016] math: clog, clog10 inaccuracy
291 [19018] nptl: Mangle function pointers in tls_dtor_list
292 [19032] math: [i386] acosh (-qNaN) spurious "invalid" exception
293 [19046] math: ldbl-128 / ldbl-128ibm lgamma bad overflow handling
294 [19048] malloc: malloc: arena free list can become cyclic, increasing
296 [19049] math: [powerpc] erfc incorrect zero sign
297 [19050] math: [powerpc] log* incorrect zero sign
298 [19058] math: [x86_64] Link fail with -fopenmp and -flto
299 [19059] math: nexttoward overflow incorrect in non-default rounding modes
300 [19071] math: ldbl-96 lroundl incorrect just below powers of 2
301 [19074] network: Data race in _res_hconf_reorder_addrs
302 [19076] math: [ldbl-128ibm] log1pl (-1) wrong sign of infinity
303 [19077] math: [ldbl-128ibm] logl (1) incorrect sign of zero result
304 [19078] math: [ldbl-128ibm] expl overflow incorrect in non-default
306 [19079] math: dbl-64/wordsize-64 lround based on llround incorrect for
308 [19085] math: ldbl-128 lrintl, lroundl missing exceptions for 32-bit long
309 [19086] manual: posix_fallocate64 documented argument order is wrong.
310 [19088] math: lround, llround missing exceptions close to overflow
312 [19094] math: lrint, llrint missing exceptions close to overflow threshold
313 [19095] math: dbl-64 lrint incorrect for 64-bit long
314 [19122] dynamic-link: Unnecessary PLT relocations in librtld.os
315 [19124] dynamic-link: ld.so failed to build with older assmebler
316 [19125] math: [powerpc32] llroundf, llround incorrect exceptions
317 [19129] dynamic-link: [arm] Concurrent lazy TLSDESC resolution can crash
318 [19134] math: [powerpc32] lround, lroundf spurious exceptions
319 [19137] libc: i386/epoll_pwait.S doesn't support cancellation
320 [19143] nptl: Remove CPU set size checking from sched_setaffinity,
321 pthread_setaffinity_np
322 [19156] math: [ldbl-128] j0l spurious underflows
323 [19164] nptl: tst-getcpu fails with many possible CPUs
324 [19168] math: math/test-ildoubl and math/test-ldouble failure
325 [19174] nptl: PowerPC: TLE enabled pthread mutex performs poorly.
326 [19178] dynamic-link: ELF_RTYPE_CLASS_EXTERN_PROTECTED_DATA confuses
328 [19181] math: [i386/x86_64] fesetenv (FE_DFL_ENV), fesetenv
329 (FE_NOMASK_ENV) do not clear SSE exceptions
330 [19182] malloc: malloc deadlock between ptmalloc_lock_all and
331 _int_new_arena/reused_arena
332 [19189] math: [ldbl-128] log1pl (-qNaN) spurious "invalid" exception
333 [19201] math: dbl-64 remainder incorrect sign of zero result
334 [19205] math: bits/math-finite.h conditions do not match math.h and
336 [19209] math: bits/math-finite.h wrongly maps ldexp to scalbn
337 [19211] math: lgamma functions do not set signgam for -ffinite-math-only
338 for C99-based standards
339 [19212] libc: features.h not -Wundef clean
340 [19213] math: [i386/x86_64] log* (1) incorrect zero sign for -ffinite-
342 [19214] libc: Family and model identification for AMD CPU's are incorrect.
343 [19219] libc: GLIBC build fails for ia64 with missing __nearbyintl
344 [19228] math: [powerpc] nearbyint wrongly clears "inexact", leaves traps
346 [19235] math: [powerpc64] lround, lroundf, llround, llroundf spurious
348 [19238] math: [powerpc] round, roundf spurious "inexact" for integer
350 [19242] libc: strtol incorrect in Turkish locales
351 [19243] malloc: reused_arena can pick an arena on the free list, leading
352 to an assertion failure and reference count corruption
353 [19253] time: tzset() ineffective when temporary TZ did not include DST
355 [19266] math: strtod ("NAN(I)") incorrect in Turkish locales
356 [19270] math: [hppa] Shared libm missing __isnanl
357 [19285] libc: [hppa] sysdeps/unix/sysv/linux/hppa/bits/mman.h: missing
358 MAP_HUGETLB and MAP_STACK defines
359 [19313] nptl: Wrong __cpu_mask for x32
360 [19347] libc: grantpt: try to force a specific gid even without pt_chown
361 [19349] math: [ldbl-128ibm] tanhl inaccurate for small arguments
362 [19350] math: [ldbl-128ibm] sinhl spurious overflows
363 [19351] math: [ldbl-128ibm] logl inaccurate near 1
364 [19363] time: x32: times() return value wrongly truncates/sign extends
366 [19367] dynamic-link: Improve branch prediction on Silvermont
367 [19369] network: Default domain name not reset by res_ninit when "search"
368 / "domain" entry is removed from resolv.conf
369 [19375] math: powerpc: incorrect results for POWER7 logb with negative
371 [19385] localedata: bg_BG: time separator should be colon, not comma
372 [19408] libc: linux personality syscall wrapper may erroneously return an
373 error on 32-bit architectures
374 [19415] libc: dladdr returns wrong names on hppa
375 [19432] libc: iconv rejects redundant escape sequences in IBM900, IBM903,
376 IBM905, IBM907, and IBM909
377 [19439] math: Unix98 isinf and isnan functions conflict with C++11
378 [19443] build: build failures with -DDEBUG
379 [19451] build: Make check fails on test-double-vlen2
380 [19462] libc: Glibc failed to build with -Os
381 [19465] math: Wrong code with -Os
382 [19466] time: time/tst-mktime2.c is compiled into an infinite loop with
384 [19467] string: Fast_Unaligned_Load needs to be enabled for Excavator core
386 [19475] libc: Glibc 2.22 doesn't build on sparc [PATCH]
387 [19486] math: S390: Math tests fail with "Exception Inexact set".
388 [19529] libc: [ARM]: FAIL: stdlib/tst-makecontext
389 [19550] libc: [mips] mmap negative offset handling inconsistent with other
391 [19590] math: Fail to build shared objects that use libmvec.so functions.
395 * The following bugs are resolved with this release:
397 438, 2981, 4719, 6544, 6792, 11216, 12836, 13028, 13064, 13151, 13152,
398 14094, 14113, 14292, 14841, 14906, 14958, 15319, 15467, 15790, 15969,
399 16159, 16339, 16350, 16351, 16352, 16353, 16361, 16512, 16526, 16538,
400 16559, 16560, 16704, 16783, 16850, 17053, 17090, 17195, 17269, 17293,
401 17322, 17403, 17475, 17523, 17542, 17569, 17581, 17588, 17596, 17620,
402 17621, 17628, 17631, 17692, 17711, 17715, 17776, 17779, 17792, 17833,
403 17836, 17841, 17912, 17916, 17930, 17932, 17944, 17949, 17964, 17965,
404 17967, 17969, 17977, 17978, 17987, 17991, 17996, 17998, 17999, 18007,
405 18019, 18020, 18029, 18030, 18032, 18034, 18036, 18038, 18039, 18042,
406 18043, 18046, 18047, 18049, 18068, 18078, 18080, 18093, 18100, 18104,
407 18110, 18111, 18116, 18125, 18128, 18134, 18138, 18185, 18196, 18197,
408 18206, 18210, 18211, 18217, 18219, 18220, 18221, 18234, 18244, 18245,
409 18247, 18287, 18319, 18324, 18333, 18346, 18371, 18383, 18397, 18400,
410 18409, 18410, 18412, 18418, 18422, 18434, 18444, 18457, 18468, 18469,
411 18470, 18479, 18483, 18495, 18496, 18497, 18498, 18502, 18507, 18508,
412 18512, 18513, 18519, 18520, 18522, 18527, 18528, 18529, 18530, 18532,
413 18533, 18534, 18536, 18539, 18540, 18542, 18544, 18545, 18546, 18547,
414 18549, 18553, 18557, 18558, 18569, 18583, 18585, 18586, 18592, 18593,
415 18594, 18602, 18612, 18613, 18619, 18633, 18635, 18641, 18643, 18648,
416 18657, 18676, 18694, 18696, 18887.
418 * Cache information can be queried via sysconf() function on s390 e.g. with
419 _SC_LEVEL1_ICACHE_SIZE as argument.
421 * A buffer overflow in gethostbyname_r and related functions performing DNS
422 requests has been fixed. If the NSS functions were called with a
423 misaligned buffer, the buffer length change due to pointer alignment was
424 not taken into account. This could result in application crashes or,
425 potentially arbitrary code execution, using crafted, but syntactically
426 valid DNS responses. (CVE-2015-1781)
428 * The time zone file parser has been made more robust against crafted time
429 zone files, avoiding heap buffer overflows related to the processing of
430 the tzh_ttisstdcnt and tzh_ttisgmtcnt fields, and a stack overflow due to
431 large time zone data files. Overly long time zone specifiers in the TZ
432 variable no longer result in stack overflows and crashes.
434 * A powerpc and powerpc64 optimization for TLS, similar to TLS descriptors
435 for LD and GD on x86 and x86-64, has been implemented. You will need
436 binutils-2.24 or later to enable this optimization.
438 * Character encoding and ctype tables were updated to Unicode 7.0.0, using
439 new generator scripts contributed by Pravin Satpute and Mike FABIAN (Red
440 Hat). These updates cause user visible changes, such as the fix for bug
443 * CVE-2014-8121 The NSS backends shared internal state between the getXXent
444 and getXXbyYY NSS calls for the same database, causing a denial-of-service
445 condition in some applications.
447 * Added vector math library named libmvec with the following vectorized x86_64
448 implementations: cos, cosf, sin, sinf, sincos, sincosf, log, logf, exp, expf,
450 The library can be disabled with --disable-mathvec. Use of the functions is
451 enabled with -fopenmp -ffast-math starting from -O1 for GCC version >= 4.9.0.
452 Shared library libmvec.so is linked in as needed when using -lm (no need to
453 specify -lmvec explicitly for not static builds).
454 Visit <https://sourceware.org/glibc/wiki/libmvec> for detailed information.
456 * A new fmemopen implementation has been added with the goal of POSIX
457 compliance. The new implementation fixes the following long-standing
458 issues: BZ#6544, BZ#11216, BZ#12836, BZ#13151, BZ#13152, and BZ#14292. The
459 old implementation is still present for use be by existing binaries.
461 * The 32-bit sparc sigaction ABI was inadvertently broken in the 2.20 and 2.21
462 releases. It has been fixed to match 2.19 and older, but binaries built
463 against 2.20 and 2.21 might need to be recompiled. See BZ#18694.
465 * Port to Native Client running on ARMv7-A (--host=arm-nacl).
466 Contributed by Roland McGrath (Google).
468 * The header <regexp.h> is deprecated, and will be removed in a future
469 release. Use of this header will trigger a deprecation warning.
470 Application developers should update their code to use <regex.h> instead.
472 This header was formerly part of SUS, but was deprecated in 1994 and
473 removed from the standard in 2001. Also, the glibc implementation
474 leaks memory. See BZ#18681 for more details.
478 * The following bugs are resolved with this release:
480 6652, 10672, 12674, 12847, 12926, 13862, 14132, 14138, 14171, 14498,
481 15215, 15378, 15884, 16009, 16418, 16191, 16469, 16576, 16617, 16618,
482 16619, 16657, 16740, 16857, 17192, 17266, 17273, 17344, 17363, 17370,
483 17371, 17411, 17460, 17475, 17485, 17501, 17506, 17508, 17522, 17555,
484 17570, 17571, 17572, 17573, 17574, 17582, 17583, 17584, 17585, 17589,
485 17594, 17601, 17608, 17616, 17625, 17630, 17633, 17634, 17635, 17647,
486 17653, 17657, 17658, 17664, 17665, 17668, 17682, 17702, 17717, 17719,
487 17722, 17723, 17724, 17725, 17732, 17733, 17744, 17745, 17746, 17747,
488 17748, 17775, 17777, 17780, 17781, 17782, 17791, 17793, 17796, 17797,
489 17801, 17803, 17806, 17834, 17844, 17848, 17868, 17869, 17870, 17885,
492 * CVE-2015-1472 CVE-2015-1473 Under certain conditions wscanf can allocate
493 too little memory for the to-be-scanned arguments and overflow the
494 allocated buffer. The implementation now correctly computes the required
495 buffer size when using malloc, and switches to malloc from alloca as
498 * A new semaphore algorithm has been implemented in generic C code for all
499 machines. Previous custom assembly implementations of semaphore were
500 difficult to reason about or ensure that they were safe. The new version
501 of semaphore supports machines with 64-bit or 32-bit atomic operations.
502 The new semaphore algorithm is used by sem_init, sem_open, sem_post,
503 sem_wait, sem_timedwait, sem_trywait, and sem_getvalue.
505 * Port to Altera Nios II has been contributed by Mentor Graphics.
507 * Optimized strcpy, stpcpy, strncpy, stpncpy, strcmp, and strncmp
508 implementations for powerpc64/powerpc64le.
509 Implemented by Adhemerval Zanella (IBM).
511 * Added support for TSX lock elision of pthread mutexes on powerpc32, powerpc64
512 and powerpc64le. This may improve lock scaling of existing programs on
513 HTM capable systems. The lock elision code is only enabled with
514 --enable-lock-elision=yes. Also, the TSX lock elision implementation for
515 powerpc will issue a transaction abort on every syscall to avoid side
516 effects being visible outside transactions.
518 * Optimized strcpy, stpcpy, strchrnul and strrchr implementations for
519 AArch64. Contributed by ARM Ltd.
521 * i386 memcpy functions optimized with SSE2 unaligned load/store.
523 * CVE-2104-7817 The wordexp function could ignore the WRDE_NOCMD flag
524 under certain input conditions resulting in the execution of a shell for
525 command substitution when the application did not request it. The
526 implementation now checks WRDE_NOCMD immediately before executing the
527 shell and returns the error WRDE_CMDSUB as expected.
529 * CVE-2012-3406 printf-style functions could run into a stack overflow when
530 processing format strings with a large number of format specifiers.
532 * CVE-2014-9402 The nss_dns implementation of getnetbyname could run into an
533 infinite loop if the DNS response contained a PTR record of an unexpected
536 * The minimum GCC version that can be used to build this version of the GNU
537 C Library is GCC 4.6. Older GCC versions, and non-GNU compilers, can
538 still be used to compile programs using the GNU C Library.
540 * The GNU C Library is now built with -Werror by default. This can be
541 disabled by configuring with --disable-werror.
543 * New locales: tu_IN, bh_IN, raj_IN, ce_RU.
545 * The obsolete sigvec function has been removed. This was the original
546 4.2BSD interface that inspired the POSIX.1 sigaction interface, which
547 programs have been using instead for about 25 years. Of course, ABI
548 compatibility for old binaries using sigvec remains intact.
550 * Merged gettext 0.19.3 into the intl subdirectory. This fixes building
551 with newer versions of bison.
553 * Support for MIPS o32 FPXX, FP64A and FP64 ABI Extensions.
554 The original MIPS o32 hard-float ABI requires an FPU where double-precision
555 registers overlay two consecutive single-precision registers. MIPS32R2
556 introduced a new FPU mode (FR=1) where double-precision registers extend the
557 corresponding single-precision registers which is incompatible with the
558 o32 hard-float ABI. The MIPS SIMD ASE and the MIPSR6 architecture both
559 require the use of FR=1 making a transition necessary. New o32 ABI
560 extensions enable users to migrate over time from the original o32 ABI
561 through to the updated o32 FP64 ABI. To achieve this the dynamic linker now
562 tracks the ABI of any loaded object and verifies that new objects are
563 compatible. Mode transitions will also be requested as required and
564 unsupportable objects will be rejected. The ABI checks include both soft and
565 hard float ABIs for o32, n32 and n64.
567 GCC 5 with GNU binutils 2.25 onwards:
568 It is strongly recommended that all o32 system libraries are built using the
569 new o32 FPXX ABI (-mfpxx) to facilitate the transition as this is compatible
570 with the original and all new o32 ABI extensions. Configure a MIPS GCC
571 compiler using --with-fp-32=xx to set this by default.
575 * The following bugs are resolved with this release:
577 6804, 9894, 11505, 12994, 13347, 13651, 14308, 14770, 15119, 15132, 15347,
578 15514, 15698, 15804, 15894, 15946, 16002, 16064, 16095, 16194, 16198,
579 16275, 16284, 16287, 16315, 16348, 16349, 16354, 16357, 16362, 16447,
580 16516, 16532, 16539, 16545, 16561, 16562, 16564, 16574, 16599, 16600,
581 16609, 16610, 16611, 16613, 16619, 16623, 16629, 16632, 16634, 16639,
582 16642, 16648, 16649, 16670, 16674, 16677, 16680, 16681, 16683, 16689,
583 16695, 16701, 16706, 16707, 16712, 16713, 16714, 16724, 16731, 16739,
584 16740, 16743, 16754, 16758, 16759, 16760, 16770, 16786, 16789, 16791,
585 16796, 16799, 16800, 16815, 16823, 16824, 16831, 16838, 16839, 16849,
586 16854, 16876, 16877, 16878, 16882, 16885, 16888, 16890, 16892, 16912,
587 16915, 16916, 16917, 16918, 16922, 16927, 16928, 16932, 16943, 16958,
588 16965, 16966, 16967, 16977, 16978, 16984, 16990, 16996, 17009, 17022,
589 17031, 17042, 17048, 17050, 17058, 17061, 17062, 17069, 17075, 17078,
590 17079, 17084, 17086, 17088, 17092, 17097, 17125, 17135, 17137, 17150,
591 17153, 17187, 17213, 17259, 17261, 17262, 17263, 17319, 17325, 17354.
593 * Reverted change of ABI data structures for s390 and s390x:
594 On s390 and s390x the size of struct ucontext and jmp_buf was increased in
595 2.19. This change is reverted in 2.20. The introduced 2.19 symbol versions
596 of getcontext, setjmp, _setjmp, __sigsetjmp, longjmp, _longjmp, siglongjmp
597 are preserved pointing straight to the same implementation as the old ones.
598 Given that, new callers will simply provide a too-big buffer to these
599 functions. Any applications/libraries out there that embed jmp_buf or
600 ucontext_t in an ABI-relevant data structure that have already been rebuilt
601 against 2.19 headers will have to rebuilt again. This is necessary in any
602 case to revert the breakage in their ABI caused by the glibc change.
604 * Support for file description locks is added to systems running the
605 Linux kernel. The standard file locking interfaces are extended to
606 operate on file descriptions, not file descriptors, via the use of
607 F_OFD_GETLK, F_OFD_SETLK, and F_OFD_SETLKW. File description locks
608 are associated with an open file instead of a process.
610 * Optimized strchr implementation for AArch64. Contributed by ARM Ltd.
612 * The minimum Linux kernel version that this version of the GNU C Library
613 can be used with is 2.6.32.
615 * Running the testsuite no longer terminates as soon as a test fails.
616 Instead, a file tests.sum (xtests.sum from "make xcheck") is generated,
617 with PASS or FAIL lines for individual tests. A summary of the results is
618 printed, including a list of failing lists, and "make check" exits with
619 error status if there were any unexpected failures. "make check
620 stop-on-test-failure=y" may be used to keep the old behavior.
622 * The am33 port, which had not worked for several years, has been removed
625 * The _BSD_SOURCE and _SVID_SOURCE feature test macros are no longer
626 supported; they now act the same as _DEFAULT_SOURCE (but generate a
627 warning). Except for cases where _BSD_SOURCE enabled BSD interfaces that
628 conflicted with POSIX (support for which was removed in 2.19), the
629 interfaces those macros enabled remain available when compiling with
630 _GNU_SOURCE defined, with _DEFAULT_SOURCE defined, or without any feature
633 * Optimized strcmp implementation for ARMv7. Contributed by ARM Ltd.
635 * Added support for TX lock elision of pthread mutexes on s390 and s390x.
636 This may improve lock scaling of existing programs on TX capable systems.
637 The lock elision code is only built with --enable-lock-elision=yes and
638 then requires a GCC version supporting the TX builtins. With lock elision
639 default mutexes are elided via __builtin_tbegin, if the cpu supports
640 transactions. By default lock elision is not enabled and the elision code
643 * CVE-2014-4043 The posix_spawn_file_actions_addopen implementation did not
644 copy the path argument. This allowed programs to cause posix_spawn to
645 deference a dangling pointer, or use an unexpected pathname argument if
646 the string was modified after the posix_spawn_file_actions_addopen
649 * All supported architectures now use the main glibc sysdeps directory
650 instead of some being in a separate "ports" directory (which was
651 distributed separately before glibc 2.17).
653 * The NPTL implementation of POSIX pthreads is no longer an "add-on".
654 On configurations that support it (all Linux configurations), it's now
655 used regardless of the --enable-add-ons switch to configure. It is no
656 longer possible to build such configurations without pthreads support.
658 * Locale names, including those obtained from environment variables (LANG
659 and the LC_* variables), are more tightly checked for proper syntax.
660 setlocale will now fail (with EINVAL) for locale names that are overly
661 long, contain slashes without starting with a slash, or contain ".." path
662 components. (CVE-2014-0475) Previously, some valid locale names were
663 silently replaced with the "C" locale when running in AT_SECURE mode
664 (e.g., in a SUID program). This is no longer necessary because of the
667 * On x86-64, the dynamic linker's lazy-binding support is now compatible
668 with application code using Intel MPX instructions. (With all previous
669 versions, the MPX register state could be clobbered when making calls
670 into or out of a shared library.) Note that while the new dynamic
671 linker is compatible with all known x86 hardware whether or not it
672 supports Intel MPX, some x86 instruction-set emulators might fail to
673 handle the new instruction encodings. This is known to affect Valgrind
674 versions up through 3.9 (but will be fixed in the forthcoming 3.10
675 release), and might affect other tools that do instruction emulation.
677 * Support for loadable gconv transliteration modules has been removed.
678 The support for transliteration modules has been non-functional for
679 over a decade, and the removal is prompted by security defects. The
680 normal gconv conversion modules are still supported. Transliteration
681 with //TRANSLIT is still possible, and the //IGNORE specifier
682 continues to be supported. (CVE-2014-5119)
684 * Decoding a crafted input sequence in the character sets IBM933, IBM935,
685 IBM937, IBM939, IBM1364 could result in an out-of-bounds array read,
686 resulting a denial-of-service security vulnerability in applications which
687 use functions related to iconv. (CVE-2014-6040)
691 * The following bugs are resolved with this release:
693 156, 387, 431, 762, 832, 926, 2801, 4772, 6786, 6787, 6807, 6810, 6981,
694 7003, 9721, 9954, 10253, 10278, 11087, 11157, 11214, 12100, 12486, 12751,
695 12986, 13028, 13982, 13985, 14029, 14032, 14120, 14143, 14155, 14286,
696 14547, 14699, 14752, 14782, 14876, 14910, 15004, 15048, 15073, 15089,
697 15128, 15218, 15268, 15277, 15308, 15362, 15374, 15400, 15425, 15427,
698 15483, 15522, 15531, 15532, 15593, 15601, 15608, 15609, 15610, 15632,
699 15640, 15670, 15672, 15680, 15681, 15723, 15734, 15735, 15736, 15748,
700 15749, 15754, 15760, 15763, 15764, 15797, 15799, 15825, 15843, 15844,
701 15846, 15847, 15849, 15850, 15855, 15856, 15857, 15859, 15867, 15886,
702 15887, 15890, 15892, 15893, 15895, 15897, 15901, 15905, 15909, 15915,
703 15917, 15919, 15921, 15923, 15939, 15941, 15948, 15963, 15966, 15968,
704 15985, 15988, 15997, 16032, 16034, 16036, 16037, 16038, 16041, 16046,
705 16055, 16071, 16072, 16074, 16077, 16078, 16103, 16112, 16143, 16144,
706 16146, 16150, 16151, 16153, 16167, 16169, 16172, 16195, 16214, 16245,
707 16271, 16274, 16283, 16289, 16293, 16314, 16316, 16330, 16337, 16338,
708 16356, 16365, 16366, 16369, 16372, 16375, 16379, 16381, 16384, 16385,
709 16386, 16387, 16390, 16394, 16398, 16400, 16407, 16408, 16414, 16430,
710 16431, 16453, 16474, 16506, 16510, 16529
712 * Slovenian translations for glibc messages have been contributed by the
713 Translation Project's Slovenian team of translators.
715 * The public headers no longer use __unused nor __block. This change is to
716 support compiling programs that are derived from BSD sources and use
717 __unused internally, and to support compiling with Clang's -fblock
718 extension which uses __block.
720 * CVE-2012-4412 The strcoll implementation caches indices and rules for
721 large collation sequences to optimize multiple passes. This cache
722 computation may overflow for large collation sequences and may cause a
723 stack or buffer overflow. This is now fixed to use a slower algorithm
724 which does not use a cache if there is an integer overflow.
726 * CVE-2012-4424 The strcoll implementation uses malloc to cache indices and
727 rules for large collation sequences to optimize multiple passes and falls
728 back to alloca if malloc fails, resulting in a possible stack overflow.
729 The implementation now falls back to an uncached collation sequence lookup
732 * CVE-2013-4788 The pointer guard used for pointer mangling was not
733 initialized for static applications resulting in the security feature
734 being disabled. The pointer guard is now correctly initialized to a
735 random value for static applications. Existing static applications need
736 to be recompiled to take advantage of the fix (bug 15754).
738 * CVE-2013-4237 The readdir_r function could write more than NAME_MAX bytes
739 to the d_name member of struct dirent, or omit the terminating NUL
740 character. (Bugzilla #14699).
742 * CVE-2013-4332 The pvalloc, valloc, memalign, posix_memalign and
743 aligned_alloc functions could allocate too few bytes or corrupt the
744 heap when passed very large allocation size values (Bugzilla #15855,
747 * CVE-2013-4458 Stack overflow in getaddrinfo with large number of results
748 for AF_INET6 has been fixed (Bugzilla #16072).
750 * New locales: ak_GH, anp_IN, ar_SS, cmn_TW, hak_TW, lzh_TW, nan_TW, pap_AW,
751 pap_CW, quz_PE, the_NP.
753 * Substantially revised locales: gd_GB, ht_HT
755 * The LC_ADDRESS field was updated to support country_car for almost all
758 * ISO 1427 definitions were updated.
760 * ISO 3166 definitions were updated.
762 * The localedef utility now supports --big-endian and --little-endian
763 command-line options to generate locales for a different system from that
764 for which the C library was built.
766 * Binary locale files now only depend on the endianness of the system for
767 which they are generated and not on other properties of that system. As a
768 consequence, binary files generated with new localedef may be incompatible
769 with old versions of the GNU C Library, and binary files generated with
770 old localedef may be incompatible with this version of the GNU C Library,
771 in the following circumstances:
773 + Locale files may be incompatible on m68k systems.
775 + Locale archive files (but not separate files for individual locales) may
776 be incompatible on systems where plain "char" is signed.
778 * The configure option --disable-versioning has been removed. Builds with
779 --disable-versioning had not worked for several years.
781 * ISO 639 definitions were updated for Chiga (cgg) and Chinese (gan, hak, czh,
782 cjy, lzh, cmn, mnp, cdo, czo, cpx, wuu, hsn, yue).
784 * SystemTap probes for malloc have been introduced.
786 * SystemTap probes for slow multiple precision fallback paths of
787 transcendental functions have been introduced.
789 * Support for powerpc64le has been added.
791 * The soft-float powerpc port now supports e500 processors.
793 * Support for STT_GNU_IFUNC symbols added for ppc32/power4+ and ppc64.
795 * A new feature test macro _DEFAULT_SOURCE is available to enable the same
796 set of header declarations that are enabled by default, even when other
797 feature test macros or compiler options such as -std=c99 would otherwise
798 disable some of those declarations.
800 * The _BSD_SOURCE feature test macro no longer enables BSD interfaces that
801 conflict with POSIX. The libbsd-compat library (which was a dummy library
802 that did nothing) has also been removed.
804 * Preliminary documentation about Multi-Thread, Async-Signal and
805 Async-Cancel Safety has been added.
807 * Change of ABI data structures for s390 and s390x:
808 On s390 and s390x the size of struct ucontext and jmp_buf was increased to
809 allow for future hardware extensions. All library functions that accept or
810 return these structures were versioned in order to provide backwards
811 compatibility with existing code. However, not all cases can be handled
812 with interface versioning. If an application embeds either structure into
813 another structure and that structure is passed to another compilation unit
814 which expects the newer larger-sized object then any access to the new
815 fields will result in undefined behaviour. Similarly any access to fields
816 that were moved by the enlarging of the structures will cause undefined
817 behaviour. To fix the undefined behaviour all objects that are part of the
818 final in-memory image must agree on the size of structures, and this may
819 require recompilation.
823 * The following bugs are resolved with this release:
825 2546, 2560, 5159, 6809, 7006, 10060, 10062, 10283, 10357, 10686, 11120,
826 11561, 12310, 12387, 12492, 12515, 12723, 13550, 13889, 13951, 13988,
827 14142, 14176, 14200, 14256, 14280, 14293, 14317, 14327, 14478, 14496,
828 14582, 14686, 14812, 14888, 14894, 14907, 14908, 14909, 14920, 14941,
829 14952, 14964, 14981, 14982, 14985, 14991, 14994, 14996, 15000, 15003,
830 15006, 15007, 15014, 15020, 15022, 15023, 15036, 15054, 15055, 15062,
831 15078, 15084, 15085, 15086, 15100, 15160, 15214, 15221, 15232, 15234,
832 15283, 15285, 15287, 15304, 15305, 15307, 15309, 15327, 15330, 15335,
833 15336, 15337, 15339, 15342, 15346, 15359, 15361, 15366, 15380, 15381,
834 15394, 15395, 15405, 15406, 15409, 15416, 15418, 15419, 15423, 15424,
835 15426, 15429, 15431, 15432, 15441, 15442, 15448, 15465, 15480, 15485,
836 15488, 15490, 15492, 15493, 15497, 15506, 15529, 15536, 15553, 15577,
837 15583, 15618, 15627, 15631, 15654, 15655, 15666, 15667, 15674, 15711,
840 * CVE-2013-2207 Incorrectly granting access to another user's pseudo-terminal
841 has been fixed by disabling the use of pt_chown (Bugzilla #15755).
842 Distributions can re-enable building and using pt_chown via the new configure
843 option `--enable-pt_chown'. Enabling the use of pt_chown carries with it
844 considerable security risks and should only be used if the distribution
845 understands and accepts the risks.
847 * CVE-2013-0242 Buffer overrun in regexp matcher has been fixed (Bugzilla
850 * CVE-2013-1914 Stack overflow in getaddrinfo with many results has been
851 fixed (Bugzilla #15330).
853 * Add support for calling C++11 thread_local object destructors on thread
854 and program exit. This needs compiler support for offloading C++11
855 destructor calls to glibc.
857 * Improved worst case performance of libm functions with double inputs and
860 * Support for priority inherited mutexes in pthread condition variables on
861 non-x86 architectures.
863 * Port to Xilinx MicroBlaze contributed by David Holsgrove.
865 * Optimized string functions for AArch64. Implemented by Marcus Shawcroft.
867 * Optimized string functions for ARM. Implemented by Will Newton and
870 * Optimized libm functions for SPARC. Implemented by David S. Miller.
872 * Support for building more of ARM glibc as Thumb-2 code. Implemented by
875 * Support for building most of MIPS glibc as MIPS16 code. Implemented by
876 Chung-Lin Tang, Maciej W. Rozycki and Maxim Kuvyrkov.
878 * Added a benchmark framework to track performance of functions in glibc.
880 * New <math.h> macro named issignaling to check for a signaling NaN (sNaN).
881 It is based on draft TS 18661 and currently enabled as a GNU extension.
883 * On Linux, the clock function now uses the clock_gettime system call
884 for improved precision, rather than old times system call.
886 * Added support for version-3 tz format files. This is needed when using
887 the tz database release 2013e or later, and affects a few unusual cases --
888 currently only TZ='America/Godthab' for time stamps after 2037.
890 * Added new API functions pthread_getattr_default_np and
891 pthread_setattr_default_np to get and set the default pthread
892 attributes of a process.
894 * Added support for TSX lock elision for pthread mutexes on i386 and x86-64.
895 This may improve lock scaling of existing programs on TSX capable systems.
896 When the --enable-lock-elision=yes parameter is specified at configure
897 time lock elision will be enabled by default for all PTHREAD_MUTEX_DEFAULT
900 * Support added for AT_HWCAP2 (to coincide with Linux kernel 3.10
901 availability). Implemented by Ryan S. Arnold.
903 * Support added for POWER8 platform. Implemented by Ryan S. Arnold.
907 * The following bugs are resolved with this release:
909 1349, 3439, 3479, 3665, 5044, 5246, 5298, 5400, 6530, 6677, 6778, 6808,
910 9685, 9914, 10014, 10038, 10114, 10191, 10631, 10873, 11438, 11607, 11638,
911 11741, 12140, 13013, 13412, 13542, 13601, 13603, 13604, 13629, 13679,
912 13696, 13698, 13717, 13741, 13759, 13761, 13763, 13881, 13939, 13950,
913 13952, 13966, 14042, 14047, 14090, 14150, 14151, 14152, 14154, 14157,
914 14166, 14173, 14195, 14197, 14237, 14246, 14251, 14252, 14283, 14298,
915 14303, 14307, 14328, 14331, 14336, 14337, 14347, 14349, 14368, 14376,
916 14417, 14447, 14459, 14476, 14477, 14501, 14505, 14510, 14516, 14518,
917 14519, 14530, 14532, 14538, 14543, 14544, 14545, 14557, 14562, 14568,
918 14576, 14579, 14583, 14587, 14595, 14602, 14610, 14621, 14638, 14645,
919 14648, 14652, 14660, 14661, 14669, 14672, 14683, 14694, 14716, 14719,
920 14743, 14767, 14783, 14784, 14785, 14793, 14796, 14797, 14801, 14803,
921 14805, 14807, 14811, 14815, 14821, 14822, 14824, 14828, 14831, 14833,
922 14835, 14838, 14856, 14863, 14865, 14866, 14868, 14869, 14871, 14872,
923 14879, 14889, 14893, 14898, 14914.
925 * Optimization of memcpy for MIPS.
927 * CVE-2011-4609 svc_run() produces high cpu usage when accept fails with
928 EMFILE has been fixed (Bugzilla #14889).
930 * The add-on ports collection is now distributed in the "ports" subdirectory
931 of the main GNU C Library distribution, rather than separately.
933 * Port to ARM AArch64 contributed by Linaro.
935 * Support for STT_GNU_IFUNC symbols added for s390 and s390x.
936 Optimized versions of memcpy, memset, and memcmp added for System z10 and
938 Implemented by Andreas Krebbel.
940 * The new function secure_getenv allows secure access to the environment,
941 returning NULL if running in a SUID/SGID process. This function replaces
942 the internal function __secure_getenv.
944 * SystemTap static probes have been added into the dynamic linker.
945 Implemented by Gary Benson.
947 * Optimizations of string functions strstr, strcasestr and memmem.
948 Implemented by Maxim Kuvyrkov.
950 * The minimum Linux kernel version that this version of the GNU C Library
951 can be used with is 2.6.16.
953 * Optimizations of string functions memchr, wcschr, wcscpy, and wcsrchr for
954 powerpc POWER7. Implemented by Will Schmidt.
956 * New configure option --disable-nscd builds the C library such that it
957 never attempts to contact the Name Service Caching Daemon (nscd).
958 New configure option --disable-build-nscd avoids building nscd itself;
959 this is the default if --disable-nscd is used.
961 * Improved support for cross-compilation, including cross-testing and
962 bootstrap builds without a previously built glibc.
964 * Several testsuite tests are now able to test multiple IFUNC variants of an
965 interface, rather than just testing the one that would be chooen by
968 * New configure options --with-bugurl and --with-pkgversion, for
969 distributors to use to embed their bug-reporting and package version
970 information in --help and --version output.
972 * The ttyname and ttyname_r functions on Linux now fall back to searching for
973 the tty file descriptor in /dev/pts or /dev if /proc is not available. This
974 allows creation of chroots without the procfs mounted on /proc.
976 * The `crypt' function now fails if passed salt bytes that violate the
977 specification for those values. On Linux, the `crypt' function will
978 consult /proc/sys/crypto/fips_enabled to determine if "FIPS mode" is
979 enabled, and fail on encrypted strings using the MD5 or DES algorithm
980 when the mode is enabled.
982 * The `clock_*' suite of functions (declared in <time.h>) is now available
983 directly in the main C library. Previously it was necessary to link with
984 -lrt to use these functions. This change has the effect that a
985 single-threaded program that uses a function such as `clock_gettime' (and
986 is not linked with -lrt) will no longer implicitly load the pthreads
987 library at runtime and so will not suffer the overheads associated with
988 multi-thread support in other code such as the C++ runtime library.
990 * New locales: ayc_PE, doi_IN, ia_FR, mni_IN, nhn_MX, niu_NU, niu_NZ,
995 * The following bugs are resolved with this release:
997 174, 208, 350, 369, 411, 706, 766, 2074, 2541, 2547, 2548, 2550, 2551,
998 2552, 2553, 2554, 2562, 2563, 2565, 2566, 2570, 2576, 2636, 2678, 3335,
999 3440, 3748, 3768, 3866, 3868, 3906, 3976, 3992, 4026, 4108, 4596, 4822,
1000 5077, 5461, 5805, 5993, 6471, 6486, 6578, 6649, 6730, 6770, 6794, 6884,
1001 6890, 6894, 6895, 6907, 6911, 6959, 7064, 9739, 9902, 10110, 10135, 10140,
1002 10153, 10210, 10254, 10346, 10375, 10545, 10716, 10846, 10882, 11174,
1003 11261, 11322, 11365, 11451, 11494, 11521, 11677, 11837, 11959, 12047,
1004 12097, 12193, 12194, 12297, 12298, 12301, 12340, 12354, 12416, 12495,
1005 13058, 13223, 13361, 13525, 13526, 13527, 13528, 13529, 13530, 13531,
1006 13532, 13533, 13547, 13551, 13552, 13553, 13555, 13556, 13559, 13563,
1007 13566, 13576, 13579, 13583, 13592, 13594, 13613, 13618, 13637, 13656,
1008 13658, 13673, 13691, 13695, 13704, 13705, 13706, 13718, 13726, 13738,
1009 13739, 13743, 13750, 13758, 13760, 13761, 13775, 13786, 13787, 13792,
1010 13806, 13824, 13840, 13841, 13844, 13846, 13848, 13851, 13852, 13854,
1011 13871, 13872, 13873, 13879, 13882, 13883, 13884, 13885, 13886, 13892,
1012 13895, 13908, 13910, 13911, 13912, 13913, 13914, 13915, 13916, 13917,
1013 13918, 13919, 13920, 13921, 13922, 13923, 13924, 13926, 13927, 13928,
1014 13938, 13941, 13942, 13954, 13955, 13956, 13963, 13967, 13968, 13970,
1015 13973, 13979, 13983, 13986, 13996, 14012, 14027, 14033, 14034, 14036,
1016 14040, 14043, 14044, 14048, 14049, 14050, 14053, 14055, 14059, 14064,
1017 14075, 14080, 14083, 14103, 14104, 14109, 14112, 14117, 14122, 14123,
1018 14134, 14153, 14183, 14188, 14199, 14210, 14218, 14229, 14241, 14273,
1021 * Support for the x32 ABI on x86-64 added. The x32 target is selected by
1022 configuring glibc with:
1023 BUILD_CC='gcc' CC='gcc -mx32' CXX='g++ -mx32'
1024 Visit <http://sites.google.com/site/x32abi/> for more x32 ABI info.
1025 Implemented by H.J. Lu.
1029 + define static_assert
1031 + do not declare gets
1033 + declare at_quick_exit and quick_exit also for ISO C11
1035 + aligned_alloc. NB: The code is deliberately allows the size parameter
1036 to not be a multiple of the alignment. This is a moronic requirement
1037 in the standard but it is only a requirement on the caller, not the
1040 + timespec_get added
1042 + uchar.h support added
1044 + CMPLX, CMPLXF, CMPLXL added
1046 Implemented by Ulrich Drepper.
1048 * Support for the IA-64 has been moved to ports.
1050 * Remove support for anything but ELF binary format
1052 * Checking versions of poll, ppoll added.
1053 Implemented by Ulrich Drepper.
1055 * More generic and 64-bit performance optimizations to math functions.
1056 Implemented by Ulrich Drepper.
1058 * New configure option --enable-obsolete-rpc makes the deprecated RPC
1059 headers and functions available at compile time as they were before
1060 version 2.14. This option will be removed at some time in the future
1061 after the TI-RPC library becomes fully sufficient for the needs of
1062 existing applications.
1064 * Compatibility code for Linux kernel versions before 2.4 has been removed.
1065 Note that glibc is not expected to work with any Linux kernel version
1068 * New header <sys/auxv.h> and function getauxval allowing easy access to
1069 the AT_* key-value pairs passed from the Linux kernel. The header also
1070 defines the HWCAP_* bits associated with the AT_HWCAP key.
1072 * New locales: mag_IN
1074 * New configure option --enable-systemtap builds SystemTap static probes
1075 into libc for setjmp and longjmp and into libpthread for various operations.
1076 So far the setjmp/longjmp probes and some of the libpthread probes are
1077 provided only for i*86 and x86_64.
1078 Implemented by Roland McGrath and Rayson Ho.
1080 * Optimized expf for x86-32 and x86-64. Implemented by Liubov Dmitrieva.
1082 * More optimized functions for PowerPC. Implemented by Adhemerval Zanella
1085 * More optimized functions for SPARC. Implemented by David S. Miller.
1087 * Improved support for cross-compilation, especially bootstrap builds
1088 without a previously built glibc.
1090 * Ports for the TILE-Gx and TILEPro families of processors. Contributed by
1091 Chris Metcalf from Tilera.
1093 * Support for the old ARM ABI has been removed from ports. Only the EABI is
1094 now supported for ARM processors.
1096 * The hard-float variant of the ARM EABI now uses /lib/ld-linux-armhf.so.3
1097 as the name of the dynamic linker, to distinguish it from the
1098 /lib/ld-linux.so.3 dynamic linker used for the base EABI.
1100 * Support for CRIS has been removed from ports.
1102 * A new class of installed header has been documented for low-level
1103 platform-specific functionality. PowerPC added the first instance with a
1104 function to provide time base register access. Contributed by Tulio
1105 Magno Quites Machado Filho.
1107 * ix86 configurations now install header files that are consistent with
1108 what x86-64 configurations install. These same header files can be used
1109 for -m32, -m64, or -mx32 builds.
1110 Contributed by H.J. Lu.
1112 * Math library bug fixes. A thorough audit of all open math library bugs was
1113 conducted by Joseph Myers. Significant progress was made on many math
1114 library bugs resulting in more accurate exceptions and function results.
1115 Many thanks to all those that contributed including Andreas Jaeger for his
1116 patch review and work on the x87 trigonometric instruction issues.
1118 * Timezone data is no longer installed. Timezone-related binaries and scripts
1119 will continue to be installed. Users should obtain their timezone data from
1120 their distribution provider or from the tzdata package at
1121 <ftp://munnari.oz.au/pub/>.
1125 * The following bugs are resolved with this release:
1127 6779, 6783, 9696, 10103, 10709, 11589, 11929, 12403, 12786, 12840, 12847,
1128 12868, 12852, 12874, 12885, 12892, 12906, 12907, 12922, 12935, 12962,
1129 13007, 13021, 13061, 13062, 13067, 13068, 13085, 13088, 13090, 13092,
1130 13096, 13114, 13118, 13123, 13134, 13138, 13147, 13150, 13166, 13179,
1131 13185, 13189, 13192, 13268, 13276, 13282, 13291, 13305, 13328, 13335,
1132 13337, 13344, 13358, 13367, 13413, 13416, 13423, 13439, 13446, 13472,
1133 13484, 13506, 13515, 13523, 13524, 13538, 13540
1135 * New program pldd to list loaded object of a process
1136 Implemented by Ulrich Drepper.
1138 * Add nss_db support back to glibc. No more dependency on Berkeley db
1139 and support for initgroups lookups.
1140 Implemented by Ulrich Drepper.
1142 * Optimized strcpy, strncpy, stpcpy, stpncpy for SSE2 and SSSE3 on x86-32.
1143 Contributed by HJ Lu.
1145 * Improved strcpy, strncpy, stpcpy, stpncpy for SSE2 and SSSE3 on x86-64.
1146 Contributed by HJ Lu.
1148 * Optimized strcat, strncat on x86-64 and optimized wcscmp, wcslen, strnlen
1149 on x86-32 and x86-64.
1150 Contributed by Liubov Dmitrieva.
1152 * Optimized strchr and strrchr for SSE on x86-32.
1153 Contributed by Liubov Dmitrieva.
1155 * Optimized memchr, memrchr, rawmemchr, memcmp, wmemcmp, wcschr, wcscpy
1156 for x86-64 and x86-32.
1157 Contributed by Liubov Dmitrieva.
1159 * New interfaces: scandirat, scandirat64
1160 Implemented by Ulrich Drepper.
1162 * Checking versions of FD_SET, FD_CLR, and FD_ISSET added.
1163 Implemented by Ulrich Drepper.
1165 * nscd now also caches the netgroup database.
1166 Implemented by Ulrich Drepper.
1168 * Integrate libm with gcc's -ffinite-math-only option.
1169 Implemented by Ulrich Drepper.
1171 * Lots of generic, 64-bit, and x86-64-specific performance optimizations
1172 to math functions. Implemented by Ulrich Drepper.
1174 * Optimized strcasecmp and strncasecmp for AVX on x86-64.
1175 Implemented by Ulrich Drepper.
1177 * New Linux interfaces: process_vm_readv, process_vm_writev
1179 * Optimized strcasecmp and strncasecmp for SSSE3 and SSE4.2 on x86-32.
1180 Implemented by Ulrich Drepper.
1182 * Optimized nearbyint and strcasecmp for PPC.
1183 Implemented by Adhemerval Zanella.
1185 * New locales: bho_IN, unm_US, es_CU, ta_LK
1189 * The following bugs are resolved with this release:
1191 386, 6420, 7101, 9730, 9732, 9809, 10138, 10149, 10157, 11099, 11257,
1192 11258, 11487, 11532, 11558, 11578, 11634, 11653, 11668, 11697, 11724,
1193 11781, 11799, 11820, 11837, 11857, 11884, 11892, 11895, 11901, 11945,
1194 11947, 11952, 11987, 12052, 12083, 12158, 12178, 12200, 12346, 12350,
1195 12393, 12420, 12432, 12445, 12449, 12453, 12454, 12460, 12469, 12489,
1196 12509, 12510, 12511, 12518, 12527, 12541, 12545, 12551, 12582, 12583,
1197 12587, 12597, 12601, 12611, 12625, 12626, 12631, 12650, 12653, 12655,
1198 12660, 12671, 12681, 12684, 12685, 12711, 12713, 12714, 12717, 12723,
1199 12724, 12734, 12738, 12746, 12766, 12775, 12777, 12782, 12788, 12792,
1200 12795, 12811, 12813, 12814, 12841
1202 * The RPC implementation in libc is obsoleted. Old programs keep working
1203 but new programs cannot be linked with the routines in libc anymore.
1204 Programs in need of RPC functionality must be linked against TI-RPC.
1205 The TI-RPC implementation is IPv6 enabled and there are other benefits.
1207 Visible changes of this change include (obviously) the inability to link
1208 programs using RPC functions without referencing the TI-RPC library and the
1209 removal of the RPC headers from the glibc headers.
1210 Implemented by Ulrich Drepper.
1212 * New Linux interfaces: clock_adjtime, name_to_handle_at, open_by_handle_at,
1213 syncfs, setns, sendmmsg
1215 * New locales: os_RU, bem_ZA, en_ZA, ff_SN, sw_KE, sw_TZ, lb_LU, wae_CH,
1216 yue_HK, lij_IT, mhr_RU
1218 * New encodings: CP770, CP771, CP772, CP773, CP774
1220 * New program sotruss to trace calls through PLTs
1221 Implemented by Ulrich Drepper.
1223 * The malloc hook implementation is marked deprecated and will be removed
1224 from the default implementation in the next version. The design never
1225 worked ever since the introduction of threads. Even programs which do
1226 not create threads themselves can use multiple threads created internally.
1230 * The following bugs are resolved with this release:
1232 3268, 6812, 7066, 10085, 10484, 10563, 10851, 11149, 11155, 11577, 11611,
1233 11640, 11655, 11701, 11840, 11856, 11883, 11903, 11904, 11968, 11979,
1234 12005, 12037, 12067, 12077, 12078, 12092, 12093, 12107, 12108, 12113,
1235 12140, 12159, 12167, 12191, 12194, 12201, 12204, 12205, 12207, 12348,
1238 * New Linux interfaces: prlimit, prlimit64, fanotify_init, fanotify_mark
1240 * POWER7 optimizations: memset, memcmp, strncmp
1242 * New optimized string functions for x86-64: strnlen (SSE2),
1243 strcasecmp (SSE2, SSSE3, SSE4.2), strncasecmp (SSE2, SSSE3, SSE4.2)
1244 Implemented by Ulrich Drepper.
1248 * The following bugs are resolved with this release:
1250 3662, 4457, 5553, 10162, 10401, 10414, 10554, 10824, 10864, 10915,
1251 10918, 10936, 10939, 10958, 10968, 10969, 10972, 10992, 11000, 11001,
1252 11007, 11010, 11027, 11039, 11040, 11041, 11043, 11046, 11056, 11070,
1253 11093, 11115, 11125, 11126, 11127, 11134, 11141, 11149, 11183, 11184,
1254 11185, 11186, 11187, 11188, 11189, 11190, 11191, 11192, 11193, 11194,
1255 11200, 11230, 11235, 11242, 11254, 11258, 11271, 11272, 11276, 11279,
1256 11287, 11292, 11319, 11332, 11333, 11387, 11389, 11390, 11394, 11397,
1257 11410, 11438, 11449, 11470, 11471, 11520, 11537, 11538, 11571
1259 * New interfaces: pthread_getname_np, pthread_setname_np
1261 * New Linux interface: recvmmsg
1263 * STT_GNU_IFUNC implemented for Sparc by David Miller.
1265 * The dynamic linker now recognizes supported ABI versions from the
1266 EI_ABIVERSION field in the ELF header.
1267 Implemented by Ulrich Drepper.
1269 * New NIS mode selector ADJUNCT_AS_SHADOW. The passwd.adjunct.byname table
1270 will not be used to fill in password fields in the passwd.byname replies.
1271 Instead it is used to synthesize the shadow.byname table, should it be
1272 missing. This is a useful mode in some installations involving Solaris.
1273 Implemented by Ulrich Drepper.
1275 * New locales: kok_IN, sq_MK, cv_RU
1279 * The following bugs are resolved with this release:
1281 3270, 7094, 9924, 9986, 10011, 10085, 10107, 10159, 10162, 10166, 10183,
1282 10195, 10196, 10200, 10203, 10207, 10211, 10213, 10217, 10221, 10229,
1283 10262, 10286, 10312, 10315, 10319, 10349, 10360, 10391, 10402, 10416,
1284 10418, 10422, 10425, 10446, 10448, 10452, 10540, 10553, 10560, 10564,
1285 10609, 10643, 10692, 10713, 10717, 10730, 10731, 10742, 10780, 10784,
1286 10789, 10817, 10823, 10840, 10847
1288 * New interfaces: execvpe, pthread_sigqueue, mkstemps, mkstemps64, mkostemps,
1290 Implemented by Ulrich Drepper.
1292 * Checking version of longjmp added that fails if an uninitialized stack
1293 frame would be created. Implemented by Ulrich Drepper.
1295 * STT_GNU_IFUNC is now supported in static executables.
1296 Implemented by H.J. Lu.
1298 * STT_GNU_IFUNC implemented for PPC by Alan Modra.
1300 * New optimized string functions for x86-64: strstr, strcasestr, memcmp,
1301 strcspn, strpbrk, strspn, strcpy, stpcpy, strncpy, strcmp (SSE2, SSE4.2),
1302 strncmp (SSE2, SSE4.2), strchr (SSE4.2), strrchr (SSE4.2).
1303 Contributed by H.J. Lu.
1305 strlen, rawmemchr, strcmp (SSSE3), strncmp (SSSE3).
1306 Implemented by Ulrich Drepper.
1308 * New optimized string functions for x86: strlen, strcspn, strspn, strpbrk,
1310 Contributed by H.J. Lu.
1312 * Support for fma instruction in AVX on x86-64.
1313 Implemented by H.J. Lu and Ulrich Drepper.
1315 * AVX support in x86-64 auditing support in ld.so.
1316 Implemented by H.J. Lu.
1318 * STB_GNU_UNIQUE support added.
1319 Implemented by Ulrich Drepper.
1321 * Implement second fallback mode for optimized DNS lookup for even more
1322 broken environments. If two requests from the same port are not
1323 handled correctly close the socket and open a new one before sending
1324 the second request. The 'single-request-reopen' option in /etc/resolv.conf
1325 can be used to select this mode right away, instead of rediscovering the
1326 necessity is every process again.
1327 Implemented by Ulrich Drepper.
1329 * New resolver flag RES_USE_DNSSEC to enable use of verified lookup.
1330 Implemented by Adam Tkac.
1332 * Optimized iconv conversions for S390x.
1333 Implemented by Andreas Krebbel.
1335 * Using condvars with PI mutexes is now more efficient due to kernel
1336 support for requeueing to PI futexes. NPTL support added for x86-64.
1337 Implemented by Ulrich Drepper.
1339 * New locales: ps_AF, my_MM
1343 * The following bugs are resolved with this release:
1345 697, 5381, 5807, 6411, 6545, 7040, 7058, 7067, 7080, 7083, 7095, 7098,
1346 9677, 9694, 9697, 9701, 9704, 9705, 9706, 9720, 9726, 9730, 9733, 9736,
1347 9741, 9750, 9753, 9759, 9781, 9791, 9793, 9823, 9833, 9844, 9880, 9881,
1348 9891, 9893, 9895, 9913, 9916, 9920, 9948, 9955, 9957, 9963, 9985, 10052,
1349 10069, 10086, 10087, 10090, 10092, 10093, 10100, 10118, 10128
1351 * New interfaces: preadv, preadv64, pwritev, pwritev64, malloc_info
1352 Implemented by Ulrich Drepper.
1354 * New Linux interfaces: accept4, fallocate, fallocate64.
1355 Implemented by Ulrich Drepper.
1357 * Correct declarations of string function when used in C++ code. This
1358 could lead to compile errors for invalid C++ code.
1360 * XPG7/POSIX 2008 compilation environment. Many GNU-specific functions are
1363 * New POSIX 2008 interface: psiginfo
1364 Implemented by Ulrich Drepper.
1366 * New ISO C++1x interfaces: quick_exit, at_quick_exit
1367 Implemented by Ulrich Drepper.
1369 * Support for selecting between multiple function definitions at runtime
1370 using STT_GNU_IFUNC symbols. Implemented by Ulrich Drepper.
1372 * The libcrypt library can now use the hash function implementations in
1373 NSS. Implemented by Ulrich Drepper.
1375 * The malloc implementation can be compiled to be less memory efficient
1376 but higher performing in multi-threaded programs.
1377 Implemented by Ulrich Drepper.
1379 * New locales: nan_TW@latin, ks_IN
1381 * Faster strlen, strchr, strchrnul, strrchr, memchr, and rawmemchr for x86-64.
1382 Implemented by Ulrich Drepper.
1384 * Extended printf hook support. It is possible to use user-defined types
1385 and extend existing format specifiers.
1386 Implemented by Ulrich Drepper.
1388 * Handling for group shadow files has been added.
1389 Implemented by Ulrich Drepper.
1391 * DNS IPv4-IPv6 parallel lookup now deals better with broken DNS
1392 servers (the case, e.g., for some people using the built-in DNS
1393 server in ADSL modems/routers). There is a once-per-process timeout
1394 in case of a broken server. To avoid it, users can run nscd or put
1395 'options single-request' in /etc/resolv.conf.
1396 Implemented by Ulrich Drepper.
1400 * The following bugs are resolved with this release:
1402 3406, 5209, 5210, 5381, 5794, 5814, 5911, 6428, 6438, 6442, 6447, 6461,
1403 6472, 6505, 6544, 6589, 6612, 6634, 6653, 6654, 6657, 6698, 6712, 6713,
1404 6719, 6723, 6724, 6740, 6763, 6771, 6790, 6791, 6817, 6824, 6839, 6843,
1405 6845, 6856, 6857, 6860, 6867, 6875, 6919, 6920, 6942, 6947, 6955, 6966,
1406 6968, 6974, 6980, 6995, 7008, 7009, 7029
1408 * Unified lookup for getaddrinfo: IPv4 and IPv6 addresses are now looked
1409 up at the same time. Implemented by Ulrich Drepper.
1411 * TLS descriptors for LD and GD on x86 and x86-64.
1412 Implemented by Alexandre Oliva.
1414 * getaddrinfo now handles DCCP and UDPlite.
1415 Implemented by Ulrich Drepper.
1417 * New fixed-size conversion macros: htobe16, htole16, be16toh, le16toh,
1418 htobe32, htole32, be32toh, le32toh, htobe64, htole64, be64toh, le64toh.
1419 Implemented by Ulrich Drepper.
1421 * New implementation of memmem, strstr, and strcasestr which is O(n).
1422 Implemented by Eric Blake.
1424 * New Linux interfaces: inotify_init1, dup3, epoll_create1, pipe2
1426 * Implement "e" option for popen to open file descriptor with the
1427 close-on-exec flag set. Implemented by Ulrich Drepper.
1429 * Implement "b" mode for fmemopen. In this mode writes writes don't
1430 implicitly add a NUL byte and seeks from the end of the buffer really
1431 use the buffer end, not the string length as the basis.
1432 Implemented by Ulrich Drepper.
1434 * Many functions, exported and internal, now atomically set the close-on-exec
1435 flag when run on a sufficiently new kernel. Implemented by Ulrich Drepper.
1437 * Sorting rules for some Indian languages (Kannada, Gurumukhi, Telugu,
1439 Implemented by Pravin Satpute.
1441 * New locales: sd_IN, sd_IN@devanagari, ks_IN@devanagari, ht_HT, en_AG, nl_AW.
1445 * The following bugs are resolved with this release:
1447 2549, 3112, 4314, 4407, 4997, 5012, 5040, 5112, 5204, 5208, 5209, 5220,
1448 5222, 5224, 5225, 5237, 5238, 5240, 5245, 5277, 5346, 5375, 5378, 5382,
1449 5424, 5427, 5428, 5435, 5436, 5439, 5441, 5442, 5443, 5451, 5452, 5454,
1450 5455, 5463, 5464, 5465, 5475, 5477, 5478, 5520, 5541, 5545, 5553, 5600,
1451 5602, 5607, 5614, 5627, 5628, 5736, 5737, 5741, 5753, 5760, 5762, 5768,
1452 5774, 5777, 5778, 5779, 5786, 5790, 5818, 5854, 5857, 5903, 5939, 5979,
1453 5983, 5995, 5998, 6004, 6007, 6020, 6021, 6024, 6040, 6042
1455 * New locales: bo_CN, bo_IN, shs_CA.
1457 * New encoding: HP-ROMAN9, HP-GREEK8, HP-THAI8, HP-TURKISH8.
1459 * Sorting rules for some Indian languages (Devanagari and Gujarati).
1460 Implemented by Pravin Satpute.
1462 * IPV6 addresses in /etc/resolv.conf can now have a scope ID
1464 * nscd caches now all timeouts for DNS entries
1465 Implemented by Ulrich Drepper.
1467 * nscd is more efficient and wakes up less often.
1468 Implemented by Ulrich Drepper.
1470 * More checking functions: asprintf, dprintf, obstack_printf, vasprintf,
1471 vdprintf, and obstack_vprintf.
1472 Implemented by Jakub Jelinek.
1474 * Faster memset for x86-64.
1475 Implemented by Harsha Jagasia and H.J. Lu.
1477 * Faster memcpy on x86.
1478 Implemented by Ulrich Drepper.
1480 * ARG_MAX is not anymore constant on Linux. Use sysconf(_SC_ARG_MAX).
1481 Implemented by Ulrich Drepper.
1483 * Faster sqrt and sqrtf implemention for some PPC variants.
1484 Implemented by Steven Munroe.
1488 * The following bugs are resolved with this release:
1490 4125, 4126, 4178, 4359, 4407, 4512, 4514, 4525, 4554, 4556, 4557, 4566,
1491 4582, 4586, 4588, 4599, 4610, 4647, 4702, 4705, 4726, 4745, 4772, 4773,
1492 4775, 4776, 4792, 4813, 4814, 4816, 4833, 4858, 4860, 4896, 4905, 4925,
1493 4936, 4937, 4938, 4941, 4946, 4963, 4972, 5010, 5028, 5043, 5058, 5063,
1494 5071, 5103, 5104, 5112, 5113, 5184, 5186
1496 * More checking functions: fread, fread_unlocked, open*, mq_open.
1497 Implemented by Jakub Jelinek and Ulrich Drepper.
1499 * Extend fortification to C++. Implemented by Jakub Jelinek.
1501 * Implement 'm' modifier for scanf. Add stricter C99/SUS compliance
1502 by not recognizing 'a' as a modifier when those specs are requested.
1503 Implemented by Jakub Jelinek.
1505 * PPC optimizations to math and string functions.
1506 Implemented by Steven Munroe.
1508 * New interfaces: mkostemp, mkostemp64. Like mkstemp* but allow additional
1509 options to be passed. Implemented by Ulrich Drepper.
1511 * More CPU set manipulation functions. Implemented by Ulrich Drepper.
1513 * New Linux interfaces: signalfd, eventfd, eventfd_read, and eventfd_write.
1514 Implemented by Ulrich Drepper.
1516 * Handle private futexes in the NPTL implementation.
1517 Implemented by Jakub Jelinek and Ulrich Drepper.
1519 * Add support for O_CLOEXEC. Implement in Hurd. Use throughout libc.
1520 Implemented by Roland McGrath and Ulrich Drepper.
1522 * Linux/x86-64 vDSO support. Implemented by Ulrich Drepper.
1524 * SHA-256 and SHA-512 based password encryption.
1525 Implemented by Ulrich Drepper.
1527 * New locales: ber_DZ, ber_MA, en_NG, fil_PH, fur_IT, fy_DE, ha_NG, ig_NG,
1528 ik_CA, iu_CA, li_BE, li_NL, nds_DE, nds_NL, pap_AN, sc_IT, tk_TM, ug_CN,
1531 + New iconv modules: MAC-CENTRALEUROPE, ISO-8859-9E, KOI8-RU.
1532 Implemented by Ulrich Drepper.
1536 * The following bugs are resolved with this release:
1538 3156, 3213, 3285, 3291, 3306, 3313, 3320, 3322, 3325, 3326, 3334, 3348,
1539 3352, 3363, 3369, 3426, 3427, 3429, 3451, 3458, 3465, 3480, 3483, 3493,
1540 3514, 3515, 3559, 3632, 3664, 3673, 3674, 3745, 3747, 3818, 3840, 3842,
1541 3851, 3855, 3884, 3885, 3902, 3905, 3919, 3944, 3954, 3955, 3957, 3991,
1542 3995, 3996, 4024, 4040, 4069, 4070, 4074, 4076, 4096, 4101, 4102, 4114,
1543 4130, 4131, 4181, 4276, 4306, 4342, 4344, 4349, 4364, 4368, 4381, 4392,
1544 4403, 4405, 4406, 4411, 4438, 4439, 4455, 4456, 4465, 4512, 4514, 4586,
1547 * New Linux interfaces: epoll_pwait, sched_getcpu.
1549 * New generic interfaces: strerror_l.
1551 * nscd can now cache the services database. Implemented by Ulrich Drepper.
1555 * The following bugs are resolved with this release:
1557 39, 68, 192, 352, 388, 531, 935, 1006, 1201, 1203, 1386, 1782, 1783, 1784,
1558 1785, 1786, 1787, 1951, 1974, 1996, 2072, 2098, 2125, 2134, 2158, 2182,
1559 2349, 2376, 2386, 2389, 2415, 2418, 2420, 2423, 2450, 2451, 2466, 2472,
1560 2473, 2477, 2498, 2499, 2501, 2502, 2505, 2507, 2508, 2509, 2517, 2526,
1561 2569, 2571, 2592, 2611, 2625, 2632, 2644, 2662, 2680, 2683, 2684, 2693,
1562 2695, 2703, 2734, 2751, 2764, 2766, 2775, 2792, 2821, 2823, 2832, 2841,
1563 2843, 2883, 2892, 2908, 2914, 2926, 2961, 2978, 2980, 2987, 2997, 2998,
1564 3013, 3018, 3034, 3040, 3044, 3123, 3124, 3137, 3138, 3143, 3155, 3189,
1565 3225, 3251, 3252, 3253, 3273
1567 * For Linux, the sorting of addresses returned by getaddrinfo now also
1568 handles rules 3, 4, and 7 from RFC 3484. I.e., all rules are handled.
1569 Implemented by Ulrich Drepper.
1571 * Allow system admin to configure getaddrinfo with the /etc/gai.conf file.
1572 Implemented by Ulrich Drepper.
1574 * New Linux interfaces: splice, tee, sync_file_range, vmsplice.
1576 * New iconv module for MIK. Contributed by Alexander Shopov.
1578 * For sites with broken group and/or passwd database, the auto-propagate
1579 option of nscd can prevent creating ID lookup entries from the results
1580 of a name lookup and vice versa. This usually is no problem but some
1581 site might have problems with the default behavior.
1582 Implemented by Ulrich Drepper.
1584 * Iterating over entire database in NIS can be slow. With the
1585 SETENT_BATCH_READ option in /etc/default/nss a system admin can decide
1586 to trade time for memory. The entire database will be read at once.
1587 Implemented by Ulrich Drepper.
1589 * The interfaces introduced in RFC 3542 have been implemented by
1592 * Support for the new ELF hash table format was added by Ulrich Drepper.
1594 * Support for priority inheritance mutexes added by Jakub Jelinek and
1597 * Support for priority protected mutexes added by Jakub Jelinek.
1599 * New locales: nr_ZA, pa_PK, ca_AD, ca_FR, ca_IT, el_CY, tr_CY, as_IN,
1600 or_IN, csb_PL, fy_NL, sr_ME.
1604 * More overflow detection functions.
1606 * New iconv converters for IBM1025, IBM1122, IBM1137, IBM1153,
1607 IBM1154, IBM1155, IBM1156, IBM1157, and IBM1158 contributed by Jiro Sekiba.
1609 More converters for IBM803, IBM901, IBM902, IBM921, IBM1008, IBM1097,
1610 IBM1112, IBM1123, IBM1130, IBM1140, IBM1141, IBM1142, IBM1143, IBM1144,
1611 IBM1145, IBM1146, IBM1147, IBM1148, IBM1149, IBM1166, IBM1167, IBM4517,
1612 IBM4899, IBM4909, IBM4971, IBM5347, IBM9030, IBM9066, IBM9448, IBM12712,
1613 IBM16804, IBM1364, IBM1371, IBM1388, IBM1390, and IBM1399 contributed
1614 by Masahide Washizawa.
1616 * It is now possible to install audit libraries for the dynamic linker using
1617 LD_AUDIT. Implemented by Ulrich Drepper.
1619 * The LinuxThreads add-on, providing pthreads on Linux 2.4 kernels, is no
1620 longer supported. The new NPTL implementation requires Linux 2.6 kernels.
1621 For a libc and libpthread that works well on Linux 2.4 kernels, we
1622 recommend using the stable 2.3 branch.
1624 * The new function open_wmemstream acts like open_memstream,
1625 but uses a wchar_t wide character buffer.
1627 * The new function ppoll is an improved version of poll, similar to pselect.
1629 * New interfaces: fdopendir, openat, fstatat, fchmodat, fchownat,
1630 futimesat, faccessat, mkdirat, mkfifoat, mknodat,
1631 renameat, unlinkat, linkat, symlinkat, readlinkat.
1633 * New Linux kernel system calls: unshare,
1634 inotify_init, inotify_add_watch, inotify_rm_watch.
1636 * The euidaccess function is now also known by the alias eaccess,
1637 for compatibility with some other systems.
1639 * Timezone data updated to 2006b version.
1643 * The following bugs are resolved with this release:
1645 38, 253, 549, 622, 653, 721, 758, 851, 877, 915, 934, 955, 961,
1646 1016, 1037, 1076, 1079, 1080, 1081, 1082, 1083, 1084, 1085, 1086,
1647 1087, 1088, 1090, 1091, 1092, 1093, 1094, 1095, 1096, 1097, 1098,
1648 1099, 1100, 1101, 1102, 1103, 1104, 1105, 1106, 1107, 1108, 1109,
1649 1110, 1111, 1112, 1113, 1125, 1137, 1138, 1249, 1250, 1251, 1252,
1650 1253, 1254, 1350, 1358, 1394, 1438, 1498, 1534
1652 Visit <http://sources.redhat.com/bugzilla/> for the details of each bug.
1654 * As of this release, GCC 4 can be used to compile the C Library.
1656 * Timezone data updated to 2005m version.
1660 * The following bugs are resolved with this release:
1662 284, 592, 602, 626, 633, 640, 650, 661, 671, 681, 693, 700, 710, 719,
1663 722, 723, 725, 726, 727, 728, 729, 730, 731, 732, 733, 734, 735, 736,
1664 737, 738, 739, 740, 741, 742, 743, 744, 745, 765, 767, 768, 769, 776,
1665 777, 787, 821, 822, 823, 825
1667 Visit <http://sources.redhat.com/bugzilla/> for the details of each bug.
1671 * Support for RFC 3678. Real implementations exist only for Linux so far.
1672 Implemented by Ulrich Drepper.
1674 * nscd can now cache entries persistently. Expiring entries are reloaded.
1675 For speedups the cache can be shared in memory with client processes.
1676 Implemented by Ulrich Drepper.
1678 * nscd can now perform SELinux checks.
1679 Implemented by Matthew Rickard <mjricka@epoch.ncsc.mil>.
1681 * getaddrinfo queries are now cached. Canonical name lookup is performed
1683 Implemented by Ulrich Drepper.
1685 * The nothrow function attribute is used when headers are used by gcc when
1686 compiling C code. This can avoid significant amounts of exception
1689 * The malloc functions perform more error checking and are stricter when
1690 it comes to reacting on errors. The default action is to terminate
1691 the process after showing an error message. Implemented by Ulrich Drepper.
1693 * Reverse lookups of IPv6 addresses does not use bit string or .ip6.int
1694 lookups anymore unless explicitly requested. Implemented by Ulrich Drepper.
1696 * Namespaces in ld.so are implemented. DSOs can be loaded in separate
1697 namespaces using the new function dlmopen(). This feature is of course,
1698 like most other dynamic loading functionality, not available in statically
1699 linked applications. Implemented by Ulrich Drepper.
1701 * Low-overhead boundary checking variants of string and some stdio functions
1702 were added. These are to be used in conjunction with a gcc patch by
1703 Jakub Jelinek which adds calls to these functions if possible.
1704 Implemented by Jakub Jelinek and Ulrich Drepper.
1706 * Old code for several operating systems and machine architectures that
1707 have not been in working condition in a long time have been removed from
1708 the main source tree maintained by the GNU C Library's maintainers.
1709 These files are now reside in the separate `ports' source module
1710 that is usable as an add-on when building the library.
1714 * New functions `dladdr1' and `dlinfo' in <dlfcn.h> provide more ways to
1715 interrogate the dynamic linker, compatible with the Solaris interface.
1717 * ELF thread-local storage support (TLS) now works on PowerPC and PowerPC64;
1718 implemented by Paul Mackerras, Steven Munroe, and Roland McGrath.
1720 * getifaddrs now uses the netlink interface on Linux to get its information.
1721 Implemented by Thorsten Kukuk.
1723 * getaddrinfo now implements AI_V4MAPPED, AI_ALL, and AI_ADDRCONF.
1724 Implemented by Ulrich Drepper.
1726 * support for non-executable stacks on x86 has been added. Changes mostly
1729 * regex is now much faster for multibyte locales. Changes by Jakub Jelinek
1732 * getaddrinfo now performs destination address selection according to
1737 * Thread-safe interfaces for many functions that access locale data
1738 were added in version 2.3, but these features were omitted from NEWS.
1739 Many functions have variants with an `_l' suffix that take a `locale_t'
1740 object as a parameter rather than consulting the current locale.
1741 The new functions `newlocale', `duplocale', and `freelocale' in <locale.h>
1742 create and maintain `locale_t' objects. Additionally, the new function
1743 `uselocale' sets "the current locale" (as used by functions not so
1744 parameterized) set for an individual thread. These features were added
1745 in version 2.3, implemented by Ulrich Drepper and Roland McGrath.
1747 * The functions getresuid, getresgid, setresuid, and setresgid, which
1748 have long been available on Linux, are now declared in <unistd.h>
1749 and are now also available on the Hurd.
1751 * ELF thread-local storage support (TLS) now works on x86-64.
1753 * The new dynamic string token $LIB is expanded in shared library names.
1754 This normally expands to lib, but on some 64-bit platforms to lib64 instead.
1756 * Aldy Hernandez contributed complete software floating point support for
1757 PowerPC machines with no FPU.
1759 * fexecve is implemented on Linux.
1761 * The `btowc' function should work at least twice as fast due to
1762 specialized callbacks in the iconv modules. Implemented by Bruno Haible.
1764 * With approriate thread add-ons cancelable functions are now implemented
1765 in libc.so as well. No need to call the function in libpthread. This
1766 change allowed to finally disable the incorrect and expensive handling
1767 of weak definition in ld.so.
1769 * Yet more PLT entries in libc.so have been removed. We finally arrived
1770 at the bare minimum. Startup times improved appropriately.
1772 * Support for the new Linux/x86 system call interface was added. The
1773 AT_SYSINFO auxiliary vector entry is recognized and handled.
1777 * Masahide Washizawa contributed iconv modules for IBM1163 and IBM1164
1780 * iconv (the program and the interface) now accepts empty names (excluding
1781 options like //TRANSLIT) to mean "use charset of current locale".
1783 * localedef can now transliterate characters in strings which are not in
1784 the provided charmap. The information from the input locale is used.
1786 * Prelinking support was added for ELF targets. This requires additional
1787 tools and recent versions of the GNU binutils. Contributed by Jakub Jelinek.
1789 * Read-only stdio streams now use mmap to speed up operation by eliminating
1790 copying and buffer underflows. To use add 'm' to the mode string of
1791 the fopen/fdopen/freopen call. Implemented by Ulrich Drepper.
1793 * The malloc functions were completely rewritten by Wolfram Gloger based
1794 on Doug Lea's malloc-2.7.0.c.
1796 * Isamu Hasegawa contributed a completely new and POSIX-conformant
1797 implementation of regex.
1799 * Bruno Haible upgraded the iconv and locale implementation to support
1802 * Contents of the LC_* and LANG environment variables in the CEN style are
1803 not recognized anymore. It never was used. Change by Ulrich Drepper.
1805 * The runtime (ld.so, libc, libpthread for Linux) now can handle the ELF
1806 thread-local storage (TLS) ABI on some platforms.
1807 Changes by Ulrich Drepper. SH support by Kaz Kojima.
1809 * Bruno Haible contributed iconv converters for ISO-2022-JP-3, SHIFT JIS-X0213,
1810 EUC-JISX0213, and TSCII.
1812 * New header <ifaddrs.h> with functions `getifaddrs' and `freeifaddrs':
1813 BSD-compatible interface for getting all network interface addresses.
1814 Implementation for IPv4 by Roland McGrath.
1816 * Loading of locale data is faster due to the introduction of a locale
1817 archive. Implemented by Roland McGrath and Ulrich Drepper.
1819 * Startup times are significantly reduced by not using exported functions
1820 inside the library itself. Changes by Jakub Jelinek, Roland McGrath,
1823 * Steven Munroe contributed a port to PowerPC64/Linux.
1827 * The Hurd now uses the GNU libio implementation of stdio rather than the
1828 old GNU stdio implementation, and uses a new ABI (libc.so.0.3).
1830 * The Hurd on x86 now has the `ioperm' function and <sys/io.h> header file
1831 with the same behavior as the Linux system call of the same name.
1835 * Stephen Moshier implemented log2, log10, powl and cbrtl for the
1836 128-bit long double format.
1838 * Masahide Washizawa contributed iconv modules for IBM1132, IBM1133, IBM1160,
1839 IBM1161, and IBM1162 charsets.
1841 * Andreas Jaeger contributed a port to x86-64/Linux.
1843 * Peter Bruin contributed a port to PowerPC/Hurd.
1845 * libc functions using I/O streams now can handle wide-oriented streams
1848 * optimizations in the dynamic linker. Binaries created by recent binutils
1849 versions start up quicker due to reduced time spent on relocations.
1851 * Support for use of gcc3 added by Jakub Jelinek and HJ Lu.
1855 * Stephen Moshier implemented cosh, expm1, log1p, acos, sinh, tanh,
1856 asinh, atanh, j0 for the 128-bit long double format.
1858 * Bruno Haible updated all the code handling Unicode in some form to
1859 support Unicode 3.1.
1861 * Speed of regex for single-byte locales is back to previous levels.
1862 Patch by Isamu Hasegawa.
1864 * Alpha, SPARC, and IA-64 now also using floating stacks.
1866 * Startup time of internationalized applications greatly improved through
1867 iconv cache. Use iconvconfig to generate the cache file.
1868 Contributed by Ulrich Drepper.
1870 * The IA-64 specific part of ld.so was rewritten to eliminate some pretty
1871 severe performance problems. Patch by David Mosberger.
1873 * The Hurd port got a lot more functionality like AIO, various stdio
1874 extensions, etc. Mainly done by Roland McGrath.
1876 * mtrace can now lookup symbols in shared libraries.
1880 * Intel's IA-64 math library is largely integrated. It provides fast and
1881 accurate implementatations for most basic and standard math functions
1882 in float, double, and long double format.
1884 * Stephen Moshier implemented j0, j1, jn, y0, y1, yn, lgamma, erf, erfc,
1885 and asin for the 96-bit long double format and asin, log, tan for the
1886 128-bit long double format.
1888 * The beginning of a last-bit accurate math library by IBM Haifa were added.
1889 The basic double functions exist today. Contributed by Abraham Ziv
1890 <ziv@il.ibm.com>, Moshe Olshansky <olshansk@il.ibm.com>, Ealan Henis
1891 <ealan@il.ibm.com>, and Anna Reitman <reitman@il.ibm.com>.
1893 * An asynchronous name lookup library was added. The interface is designed
1894 after POSIX AIO. The proposal was circulated beforehand to get comments.
1895 No negative ones came in. Implemented by Ulrich Drepper.
1897 * Port to S390/64bit contributed by Martin Schwidefsky
1898 <schwidefsky@de.ibm.com>.
1900 * David Mosberger <davidm@hpl.hp.com> implemented the setcontext family
1901 of functions for Linux/IA-64.
1903 * The RPC code is now thread safe. Threads can now use the same service
1904 of different services at the same time. Patch by Eric Norum
1905 <eric.norum@usask.ca> with some help by Ulrich Drepper.
1907 * Martin Schwidefsky <schwidefsky@de.ibm.com> implemented the setcontext
1908 family of functions for Linux/S390.
1910 * Ulrich Drepper <drepper@redhat.com> implemented the setcontext family
1911 of functions for Linux/x86.
1913 * Port to Linux/CRIS contributed by Axis Communications.
1917 * Lots of headers were cleaned up. Using the tool in the conform/ subdir
1918 we can now check for namespace violations and missing declarations. The
1919 result is that almost all headers are now Unix-compliant (as defined in
1920 the upcoming XPG6). The negative side is that some programs might need
1921 corrections, too, if they depend on the incorrect form of the headers in
1922 previous versions which defined too many symbols and included too many
1925 * regex now handles multibyte character sets correctly.
1926 Contributed by Isamu Hasegawa <isamu@yamato.ibm.com>.
1928 * iconv (the program) does now conform to the upcoming XPG6 and handles
1929 charmaps. Instead of the charset names the path of charmaps can be
1930 provided and the conversion happens based on this data.
1931 Contributed by Ulrich Drepper.
1933 * The locale program now provides detailed information about the installed
1938 only lists the names of the supported locales
1942 provides details such as country, language, and codeset name.
1943 Contributed by Ulrich Drepper.
1947 * The gencat program now parses the input file according to the charset
1948 selected by the LC_CTYPE category. This is important for stateful
1949 character sets. To make generating catalogs easier there is a way
1950 to overwrite the charset selected by the locale: before the first
1951 message or $ quote line the catalog can contain a line like
1953 $ codeset=ISO-8859-2
1955 to select the charset (ISO-8859-2 in this case).
1957 Implemented by Shinya Hanataka and Ulrich Drepper.
1959 * New codeset conversion modules: IBM-922 (Estonia PC codeset),
1960 IBM-1124 (Ukraine PC codeset), IBM-1129 (Vietnamese PC codeset).
1961 Contributed by Masahide Washizawa <washi@jp.ibm.com>.
1963 * Optimized string functions for Alpha ev6 and ev67 by Richard Henderson
1964 <rth@redhat.com> and Rick Gorton <rick.gorton@alpha-processor.com>.
1966 * The LANGUAGE environment variable is now ignored unless the locale is
1967 changed from the default "C" locale.
1969 * The usual bug fixes.
1973 * Greg McGary added runtime support for bounds checking using gcc's
1974 new -fbounded-pointers option. ix86 target is complete. PowerPC
1977 * Thorsten Kukuk added secure mode support to nscd.
1979 * The Berkeley db libraries have been removed.
1981 Related, the nss_db module is now in a separate package since it
1982 obviously requires a database library being available.
1984 * Wide character I/O streams implemented by Ulrich Drepper.
1986 * Functions from the extended socket API added by Ulrich Drepper.
1988 * Functions feenableexcept and fedisableexcept to control the
1989 behaviour of individual exceptions have been added by Andreas Jaeger.
1991 * ldconfig program added by Andreas Jaeger and Jakub Jelinek.
1993 * The resolver code has been updated from bind 8.2.3-T5B which supports
1994 threads. The integration was done by Andreas Jaeger, Adam D. Bradley,
1997 This change could in some situations effect backward compatibility. Since
1998 now `_res' is a thread-local instead of a global variable, modifying it
1999 in one thread does not have any effect in other threads.
2001 The resolver library was also extended to allow IPv6 as the transport
2002 protocol for the requests. This work was done by Stig Venaas.
2004 * Compatibility code for K&R C compilers has been removed from the
2005 header files. A ISO C compiler is needed to use the library
2006 (conforming to either C89 or C99 standard).
2008 * Complete rewrite of the localedef program to support multibyte character
2009 sets. Implement handling of ISO 14651 and ISO 14652. Rewrite strcoll,
2010 strxfrm, wcscoll, and wcsxfrm functions. Make isw*() functions work.
2011 Implemented by Ulrich Drepper.
2013 Bruno Haible significantly improved the generation and use of the data
2014 structures for the wide character tables.
2016 * Plural handling in gettext implemented by Ulrich Drepper.
2018 * The utmp daemon has been removed.
2020 * The port to MIPS-Linux has been finished by Andreas Jaeger.
2022 * A port to Hitachi SH3 and SH4 has been contributed by Kazumoto Kojima
2025 * POSIX clocks and timers implemented by Kaz Kylheku and Ulrich Drepper.
2027 * POSIX barriers implemented by Kaz Kylheku.
2029 * POSIX spawn function family implemented by Ulrich Drepper.
2031 * POSIX spinlocks are now available.
2033 * Timed wait functions for mutex, rwlock, and semaphores are implemented.
2035 * the configure option --enable-kernel=X.Y.Z allows to strip out
2036 compatibility for kernel versions before X.Y.Z. This is currently only
2037 implemented for Linux.
2039 * the sockaddr_in6 structure changed. The IPv6 working group added a new
2040 field sin6_scope_id. This means that all programs using IPv6 should be
2041 recompiled. Don't expect binary compatibility with previous glibc
2044 * various conversion modules for IBM character sets contributed by
2047 * IA-64 port by Jes Sorensen and HJ Lu.
2061 * New ISO C 9x function _Exit, imaxabs, and imaxdiv are added.
2063 * New xdr functions are added; some rpc functions are now 64bit clean.
2065 * Fixed a number of bugs and memory leaks (especially in NIS+ code).
2067 * Fixed known incompatibilities with glibc 2.0.
2069 * New functions lock64, strchrnul, rawmemchr, getutmp and getutmpx.
2071 * Optimized a number of functions (especially the ELF dynamic loader).
2073 * Update timezone data files.
2075 * lots of charmaps corrections
2077 * some new locale definitions and charmaps
2082 * Richard Henderson corrected size of struct timeval on Linux/Alpha to
2083 conform to POSIX member type requirements. Symbol versions have been
2084 adjusted as needed within the library, and for direct use by applications,
2085 but there is potential for problems if third-party libraries use
2086 struct timeval as part of their interface. This does not present
2087 a problem for X and other "essential" system libraries.
2089 * An additional locale model to support C++ Standard Library locale
2090 model and probably more was implemented by Ulrich Drepper.
2092 * Eric Youngdale and Ulrich Drepper implemented versioning of objects on
2095 * Miles Bader provided the `argp' function family to support hierachical
2096 command line argument parsing, layered on top of getopt.
2098 * strtod accepts new hexadecimal floating-point format from ISO C 9X.
2100 * printf has two new specifiers %a and %A to print hexadecimal flaoting-point
2103 * scanf recognizes the %a and %A format for scanning floating point numbers.
2105 * the new headers <stdint.h> and <inttypes.h> from ISO C 9X provides
2106 information and interfaces for the available integer types.
2108 * about 130 new math functions were added to implement the ISO C9x math
2111 * the new header <complex.h> contains definitions of the complex math
2112 functions from ISO C 9X.
2114 * the new header <tgmath.h> defines generic macros to use complex or
2115 real valued functions.
2117 * Thorsten Kukuk provided an implementation for NIS+, securelevel 0, 1 and 2.
2119 * Andreas Jaeger provided a test suite for the math library.
2121 * Mark Kettenis implemented the utmpx interface and an utmp daemon.
2123 * Ulrich Drepper added character set conversion functions (iconv).
2125 * Optimized string functions have been added.
2127 * The localedata addon is now part of glibc.
2129 * An implementation of profiling shared libraries was added by Ulrich Drepper.
2131 * Thorsten Kukuk and Ulrich Drepper provided an implementation for a caching
2132 daemon for NSS (nscd).
2134 Missing a better place here are some numbers on improvements. Under
2135 Linux 2.1.125 un-tar-ing the kernel sources takes
2139 using local files 12.19s 6.88s 22.91s
2141 using NIS 13.92s 8.91s 26.34s
2143 using NIS & nscd 10.37s 7.34s 25.30s
2145 using NIS+ 27.57s 30.37s 640.46s
2147 using NIS+ & nscd 10.25s 7.83s 26.51s
2149 using NIS & old nscd [1] 13.83s 8.32s 29.60s
2151 Keep in mind that non-namelookup related operations dominate above times.
2152 It was just a common complain that using NIS+ unpacking the kernel is
2155 [1] The old nscd implementation is not available anymore since it was
2156 distributed with glibc up to version 2.0.98 and thus is now replaced.
2158 * Tim Waugh provided an implementation of the POSIX.2 wordexp function family.
2160 * Mark Kettenis provided a Hesiod NSS module.
2162 * The ELF dynamic loader knows how to process dynamic string tokens ($ORIGIN
2163 and $PLATFORM) in RPATHs and similar strings (Ulrich Drepper).
2165 * rcmd can now handle netgroups (Dick Streefland).
2167 * A port to the ARM was contributed by Phil Blundell, Pat Beirne and Scott
2170 * Support for the IPv6 protocol has been added to the socket API, as per the
2171 latest draft standards.
2173 * Support for Linux 2.2 has been added.
2175 * Interface changes relative to the latest 2.0.x release:
2176 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
2177 addseverity NEW: Unix98
2178 alphasort64 NEW: LFS
2179 argp_err_exit_status NEW: argp, GNU ext
2180 argp_error NEW: argp, GNU ext
2181 argp_failure NEW: argp, GNU ext
2182 argp_help NEW: argp, GNU ext
2183 argp_parse NEW: argp, GNU ext
2184 argp_program_bug_address NEW: argp, GNU ext
2185 argp_program_version NEW: argp, GNU ext
2186 argp_program_version_hook NEW: argp, GNU ext
2187 argp_state_help NEW: argp, GNU ext
2188 argp_usage NEW: argp, GNU ext
2189 authdes_create NEW: Secure RPC
2190 authdes_getucred NEW: Secure RPC
2191 authdes_pk_create NEW: Secure RPC
2192 backtrace NEW: GNU ext.
2193 backtrace_symbols NEW: GNU ext.
2194 backtrace_symbols_fd NEW: GNU ext.
2196 cacosf NEW: ISO C 9x
2197 cacosh NEW: ISO C 9x
2198 cacoshf NEW: ISO C 9x
2199 cacoshl NEW: ISO C 9x
2200 cacosl NEW: ISO C 9x
2207 casinf NEW: ISO C 9x
2208 casinh NEW: ISO C 9x
2209 casinhf NEW: ISO C 9x
2210 casinhl NEW: ISO C 9x
2211 casinl NEW: ISO C 9x
2213 catanf NEW: ISO C 9x
2214 catanh NEW: ISO C 9x
2215 catanhf NEW: ISO C 9x
2216 catanhl NEW: ISO C 9x
2217 catanl NEW: ISO C 9x
2218 cbc_crypt NEW: Secure RPC
2222 ccoshf NEW: ISO C 9x
2223 ccoshl NEW: ISO C 9x
2229 cimagf NEW: ISO C 9x
2230 cimagl NEW: ISO C 9x
2231 clearerr_locked REMOVED
2232 clntunix_create NEW: sunrpc ext
2234 clog10 NEW: ISO C 9x
2235 clog10f NEW: ISO C 9x
2236 clog10l NEW: ISO C 9x
2246 cprojf NEW: ISO C 9x
2247 cprojl NEW: ISO C 9x
2249 crealf NEW: ISO C 9x
2250 creall NEW: ISO C 9x
2255 csinhf NEW: ISO C 9x
2256 csinhl NEW: ISO C 9x
2259 csqrtf NEW: ISO C 9x
2260 csqrtl NEW: ISO C 9x
2264 ctanhf NEW: ISO C 9x
2265 ctanhl NEW: ISO C 9x
2267 des_setparity NEW: Secure RPC
2268 ecb_crypt NEW: Secure RPC
2269 endutxent NEW: Unix98
2271 exp10f NEW: ISO C 9x
2272 exp10l NEW: ISO C 9x
2276 fattach NEW: STREAMS
2277 fdetach NEW: STREAMS
2281 feclearexcept NEW: ISO C 9x
2282 fegetenv NEW: ISO C 9x
2283 fegetexceptflag NEW: ISO C 9x
2284 fegetround NEW: ISO C 9x
2285 feholdexcept NEW: ISO C 9x
2287 feraiseexcept NEW: ISO C 9x
2288 ferror_locked REMOVED
2289 fesetenv NEW: ISO C 9x
2290 fesetexceptflag NEW: ISO C 9x
2291 fesetround NEW: ISO C 9x
2292 fetestexcept NEW: ISO C 9x
2293 feupdateenv NEW: ISO C 9x
2294 fflush_locked REMOVED
2298 fgets_unlocked NEW: GNU ext.
2299 fileno_locked REMOVED
2311 fputc_locked REMOVED
2312 fputs_unlocked NEW: GNU ext.
2313 fread_unlocked NEW: GNU ext.
2318 fstatvfs NEW: Unix98
2322 ftruncate64 NEW: LFS
2324 fwrite_unlocked NEW: GNU ext.
2325 gai_strerror NEW: IPv6
2329 getchar_locked REMOVED
2331 getdate_err NEW: Unix98
2332 getdate_r NEW: GNU ext.
2334 getnameinfo NEW: IPv6
2335 getnetname NEW: Secure RPC
2336 getpmsg NEW: STREAMS
2337 getpt NEW: Unix98 PTY
2338 getrlimit64 NEW: LFS
2339 getutxent NEW: Unix98
2340 getutxid NEW: Unix98
2341 getutxline NEW: Unix98
2342 glob64 NEW: GNU ext.
2343 globfree64 NEW: GNU ext.
2344 gnu_get_libc_release NEW: GNU ext.
2345 gnu_get_libc_version NEW: GNU ext.
2346 grantpt NEW: Unix98 PTY
2347 host2netname NEW: Secure RPC
2349 iconv_close NEW: iconv
2350 iconv_open NEW: iconv
2351 if_freenameindex NEW: IPv6
2352 if_indextoname NEW: IPv6
2353 if_nameindex NEW: IPv6
2354 if_nametoindex NEW: IPv6
2355 in6addr_any NEW: IPv6
2356 in6addr_loopback NEW: IPv6
2357 inet6_isipv4mapped NEW: IPv6
2358 isastream NEW: STREAMS
2359 iswblank NEW: GNU ext.
2360 key_decryptsession NEW: Secure RPC
2361 key_decryptsession_pk NEW: Secure RPC
2362 key_encryptsession NEW: Secure RPC
2363 key_encryptsession_pk NEW: Secure RPC
2364 key_gendes NEW: Secure RPC
2365 key_get_conv NEW: Secure RPC
2366 key_secretkey_is_set NEW: Secure RPC
2367 key_setnet NEW: Secure RPC
2368 key_setsecret NEW: Secure RPC
2369 llrint NEW: ISO C 9x
2370 llrintf NEW: ISO C 9x
2371 llrintl NEW: ISO C 9x
2372 llround NEW: ISO C 9x
2373 llroundf NEW: ISO C 9x
2374 llroundl NEW: ISO C 9x
2379 lrintf NEW: ISO C 9x
2380 lrintl NEW: ISO C 9x
2381 lround NEW: ISO C 9x
2382 lroundf NEW: ISO C 9x
2383 lroundl NEW: ISO C 9x
2385 makecontext NEW: Unix98
2386 mempcpy NEW: GNU ext.
2389 modify_ldt NEW: kernel
2393 nearbyint NEW: ISO C 9x
2394 nearbyintf NEW: ISO C 9x
2395 nearbyintl NEW: ISO C 9x
2396 netname2host NEW: Secure RPC
2397 netname2user NEW: Secure RPC
2398 nexttoward NEW: ISO C 9x
2399 nexttowardf NEW: ISO C 9x
2400 nexttowardl NEW: ISO C 9x
2404 passwd2des NEW: Secure RPC
2406 pow10f NEW: GNU ext.
2407 pow10l NEW: GNU ext.
2410 printf_size NEW: GNU ext.
2411 printf_size_info NEW: GNU ext.
2412 profil_counter REMOVED
2413 pthread_mutexattr_getkind_np REPLACED
2414 pthread_mutexattr_setkind_np REPLACED
2415 ptsname NEW: Unix98 PTY
2416 ptsname_r NEW: Unix98 PTY
2418 putchar_locked REMOVED
2419 putgrent NEW: GNU ext.
2421 putpmsg NEW: STREAMS
2422 pututxline NEW: Unix98
2426 readdir64_r NEW: LFS
2427 remquo NEW: ISO C 9x
2428 remquof NEW: ISO C 9x
2429 remquol NEW: ISO C 9x
2431 roundf NEW: ISO C 9x
2432 roundl NEW: ISO C 9x
2434 scalbln NEW: ISO C 9x
2435 scalblnf NEW: ISO C 9x
2436 scalblnl NEW: ISO C 9x
2438 sendfile NEW: kernel
2439 setcontext NEW: Unix98
2440 setrlimit64 NEW: LFS
2441 setutxent NEW: Unix98
2443 sigignore NEW: Unix98
2444 sigqueue NEW: POSIX.1b
2445 sigrelse NEW: Unix98
2446 sigset NEW: POSIX.1b
2447 sigtimedwait NEW: POSIX.1b
2448 sigwaitinfo NEW: POSIX.1b
2449 sincos NEW: GNU ext.
2450 sincosf NEW: GNU ext.
2451 sincosl NEW: GNU ext.
2455 strcasestr NEW: GNU ext.
2456 strtoimax NEW: ISO C 9x
2457 strtoumax NEW: ISO C 9x
2458 strverscmp NEW: GNU ext.
2459 svcauthdes_stats NEW: Secure RPC
2460 svcunix_create NEW: sunrpc etx
2461 svcunixfd_create NEW: sunrpc ext
2462 swapcontext NEW: Unix98
2463 tcgetsid NEW: Unix98 PTY
2464 tdestroy NEW: GNU ext.
2465 tgamma NEW: ISO C 9x
2466 tgammaf NEW: ISO C 9x
2467 tgammal NEW: ISO C 9x
2471 truncf NEW: ISO C 9x
2472 truncl NEW: ISO C 9x
2474 unlockpt NEW: Unix98 PTY
2475 updwtmpx NEW: Unix98
2476 user2netname NEW: Secure RPC
2477 utmpxname NEW: Unix98
2478 versionsort NEW: GNU ext.
2479 versionsort64 NEW: GNU ext.
2481 wcscasecmp NEW: GNU ext.
2482 wcsncasecmp NEW: GNU ext.
2483 wcsnlen NEW: GNU ext.
2484 wcstoimax NEW: ISO C 9x
2485 wcstoll NEW: ISO C 9x
2486 wcstoull NEW: ISO C 9x
2487 wcstoumax NEW: ISO C 9x
2489 wordexp NEW: POSIX.2
2490 wordfree NEW: POSIX.2
2491 write_profiling REMOVED
2492 xdecrypt NEW: Secure RPC
2493 xdr_authdes_cred NEW: Secure RPC
2494 xdr_authdes_verf NEW: Secure RPC
2495 xdr_cryptkeyarg NEW: Secure RPC
2496 xdr_cryptkeyarg2 NEW: Secure RPC
2497 xdr_cryptkeyres NEW: Secure RPC
2498 xdr_getcredres NEW: Secure RPC
2499 xdr_key_netstarg NEW: Secure RPC
2500 xdr_key_netstres NEW: Secure RPC
2501 xdr_keybuf NEW: Secure RPC
2502 xdr_keystatus NEW: Secure RPC
2503 xdr_netnamestr NEW: Secure RPC
2504 xdr_sizeof NEW: Secure RPC
2505 xdr_unixcred NEW: sunrpc ext
2506 xencrypt NEW: Secure RPC
2507 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
2518 * inet_ntoa is thread-safe
2520 * updwtmp is moved from libutil to libc
2522 * rewrite of cbrt function
2524 * update of timezone data
2538 * add atoll function
2540 * fix complex problems in Berkeley DB code
2542 * fix math functions
2546 * fixed lots of header problems (especially Linux/GNU specific)
2548 * dynamic loader preserves all registers
2550 * Roland McGrath provided support for handling of auxiliary objects in
2551 the ELF dynamic loader.
2553 * support for parallel builds is improved
2557 * GNU extensions are no longer declared by default. To enable them you
2558 must define the macro `_GNU_SOURCE' in your program or compile with
2561 * The library has changed from using GNU ld symbol aliases to using weak
2562 symbols where available. The ELF object file format supports weak
2563 symbols; GNU ld also supports weak symbols in the a.out format. (There
2564 is also now support for other GNU ld extensions in ELF. Use the
2565 `--with-elf' option to configure to indicate you have ELF, and
2566 `--with-gnu-ld' if using GNU ld.) This change resulted in the deletion
2567 of many files which contained only symbol aliases, reducing the size of
2568 the source and the compiled library; many other files were renamed to
2569 less cryptic names previously occupied by the symbol alias files.
2570 There is a new header file <elf.h> for programs which operate on
2571 files in the ELF format.
2573 * Converted to Autoconf version 2, so `configure' has more options.
2574 Run `configure --help' to see the details.
2576 * The library can now be configured to build profiling, highly-optimized
2577 (but undebuggable), and/or shared libraries (ELF with GNU ld only). The
2578 `--enable-profile', `--enable-omitfp', and `--enable-shared' options to
2579 `configure' enable building these extra libraries. The shared library is
2580 built by default when using both ELF and GNU ld. When shared libraries
2581 are enabled, the new library `-ldl' is available for arbitrary run-time
2582 loading of shared objects; its interface is defined in <dlfcn.h>. The
2583 new header file <link.h> gives access to the internals of the run-time
2584 dynamic linker, `ld.so'. The shell script `ldd' is similar to the
2585 application of same name on other systems and it provides information
2586 about dynamically linked binaries.
2588 * The C library now provides the run-time support code for profiling
2589 executables compiled with `-pg'. Programs can control the profiling code
2590 through the interface in <sys/gmon.h>. The `gmon.out' files written by
2591 the GNU C library can be read only by GNU `gprof' (from GNU binutils);
2592 the support for this file format was contributed by David Mosberger-Tang.
2594 * The math code has been replaced with a math library based on fdlibm from
2595 Sun, and modified by JT Conklin and Ulrich Drepper with i387 support, by
2596 Ian Taylor with `float' functions and by Ulrich Drepper with `long double'
2597 functions. The math functions now reside in a separate library, so
2598 programs using them will need to use `-lm' their linking commands.
2600 * John C. Bowman contributed optimized ix87 assembler inline functions.
2602 * Ulrich Drepper has contributed support for an `/etc/nsswitch.conf'
2603 mechanism similar to that found in Solaris 2. This is now used for the
2604 group, passwd, hosts, networks, services, protocols, rpc, ethers,
2605 shadow, netgroup, publickey, and alias databases. The `nsswitch.conf'
2606 file controls what services are used for each individual database. This
2607 works by loading shared libraries with names specified in `nsswitch.conf',
2608 so service modules can be changed or added at any time without even
2609 relinking any program. Currently there are the file, db, and NIS based
2610 NSS services available.
2612 * The new functions `strtoq' and `strtouq' parse integer values from
2613 strings, like `strtol' and `strtoul', but they return `long long int' and
2614 `unsigned long long int' values, respectively (64-bit quantities).
2616 * The new functions `strtof' and `strtold' parse floating-point values from
2617 strings, like `strtod', but they return `float' and `long double' values,
2618 respectively (on some machines `double' and `long double' are the same).
2620 * Ulrich Drepper has contributed new implementations of the floating-point
2621 printing and reading code used in the `printf' family of functions and
2622 `strtod', `strtof', and `strtold'. These new functions are perfectly
2623 accurate, and much faster than the old ones.
2625 * The implementation of the POSIX locale model was completely rewritten by
2626 Ulrich Drepper. This includes the new programs `localedef' and `locale'
2627 to compile the POSIX locale definition.
2629 * The former dummy implementations of the strcoll and strxfrm function are
2630 now replaced by fully functional code contributed by Ulrich Drepper. The
2631 collation information comes from the POSIX locale definitions.
2633 * The new header <langinfo.h> defines an interface for accessing
2634 various locale-dependent data (using the locale chosen with `setlocale').
2636 * Ulrich Drepper has contributed a new suite of functions for operation on
2637 wide-character and multibyte-character strings, in <wchar.h>;
2638 and classification and case conversion of wide characters, in <wctype.h>.
2639 These new functions are conforming to the ISO C, Amendement 1 specification.
2641 * There is now a second implementation of the standard I/O library available.
2642 It comes from GNU libg++ as was written by Per Bothner, heavily modified
2643 by Hongjiu Lu and made thread safe by Ulrich Drepper.
2645 * You can now use positional parameter specifications in format strings
2646 for the `printf' and `scanf' families of functions. For example,
2647 `printf ("Number %2$d, Mr %1$s\n", "Jones", 6);'' prints
2648 ``Number 6, Mr Jones''. This is mainly useful when providing different
2649 format strings for different languages, whose grammars may dictate
2650 different orderings of the values being printed. To support this
2651 feature, the interface for `register_printf_handler' has changed; see
2652 the header file <printf.h> for details.
2654 * The `printf' and `scanf' families of functions now understand a new
2655 formatting flag for numeric conversions: the ' flag (e.g. %'d or %'f) says
2656 to group numbers as indicated by the locale; for `scanf' and friends, this
2657 says to accept as valid only a number with all the proper grouping
2658 separators in the right places. In the default "C" locale, numbers are
2659 not grouped; but locales for specific countries will define the usual
2660 conventions (i.e. separate thousands with `,' in the US locale).
2662 * The pgrp functions have been regularized, slightly incompatibly but much
2663 less confusingly. The core functions are now `getpgid' and `setpgid',
2664 which take arguments for the PID to operate on; the POSIX.1 `getpgrp' (no
2665 argument) and BSD `setpgrp' (identical to `setpgid') functions are
2666 provided for compatibility. There is no longer an incompatible `getpgrp'
2667 with an argument declared under _BSD_SOURCE; no BSD code uses it.
2669 * The new header file <fts.h> and suite of functions simplify programs that
2670 operate on directory trees. This code comes from 4.4 BSD.
2672 * The resolver code has been updated from the BIND 4.9.5-P1 release.
2673 Parts of the code were heavily modified by Ulrich Drepper to fit in the
2674 NSS scheme used in glibc.
2676 * There is a new malloc debugging hook `__memalign_hook'.
2678 * There are new typedefs `ushort' for `unsigned short int' and `uint' for
2679 `unsigned int' in <sys/types.h>. These are for compatibility only and
2680 their use is discouraged.
2682 * The `-lmcheck' library to enable standard malloc debugging hooks is now
2683 done differently, so that it works even without GNU ld.
2685 * New function `euidaccess' checks allowed access to a file like `access',
2686 but using the effective IDs instead of the real IDs.
2688 * The time zone data files have been updated for the latest and greatest
2689 local time conventions of the countries of the world.
2691 * The new function `dirfd' extracts the file descriptor used by a DIR stream;
2694 * The new functions `ecvt', `fcvt', and `gcvt' provide an obsolete interface
2695 for formatting floating-point numbers. They are provided only for
2696 compatibility; new programs should use `sprintf' instead. There are
2697 also equivalent function for the `long double' floating-point type and
2698 all functions also exist in a reentrant form.
2700 * The new auxiliary library `-lutil' from 4.4 BSD contains various
2701 functions for maintaining the login-record files (primarily of use to
2702 system programs such as `login'), and convenient functions for
2703 allocating and initializing a pseudo-terminal (pty) device.
2705 * Ulrich Drepper has contributed new support for System V style
2706 shared memory and IPC on systems that support it.
2708 * Ulrich Drepper has contributed several miscellaneous new functions found
2709 in System V: The `hsearch' family of functions provide an effective
2710 implementation of hash tables; `a64l' and `l64a' provide a very simple
2711 binary to ASCII mapping; `drand48' and friends provide a 48-bit random
2714 * Ulrich Drepper has contributed new reentrant counterparts for the
2715 `random' and `hsearch' families of functions; `random_r', `hsearch_r', etc.
2717 * Ulrich Drepper has contributed new, highly-optimized versions of several
2718 string functions for the i486/Pentium family of processors.
2720 * Ulrich Drepper has updated the Linux-specific code, based largely
2721 on work done in Hongjiu Lu's version of GNU libc for Linux.
2722 The GNU library now supports Linux versions 2.0.10 and later,
2723 using the ELF object file format (i[3456]86-*-linux).
2725 * Andreas Schwab has ported the C library to Linux/m68k (m68k-*-linux).
2727 * David Mosberger-Tang and Richard Henderson have ported the C library
2728 to Linux/Alpha (alpha-*-linux). Richard Henderson contributed the
2729 dynamic linking support for ELF/Alpha.
2731 * Richard Henderson contributed several Alpha optimized assembler function
2732 for arithmetic and string handling.
2734 * Ulrich Drepper has contributed a new set of message catalog functions to
2735 support multiple languages using the <libintl.h> interface, for use with
2736 his new package GNU gettext. Translation volunteers have contributed
2737 catalogs of the library's messages in Spanish, German, and Korean.
2739 * For compatibility with XPG4, Ulrich Drepper has contributed the `gencat'
2740 program and the `catgets' function for reading the catalog files it
2741 creates. (The <libintl.h> interface is preferred; we include the
2742 <nl_types.h> interface using `catgets' only for source compatibility with
2743 programs already written to use it.)
2745 * New header file <values.h> gives SVID-compatible names for <limits.h>
2748 * Various new macros, declarations, and small header files for compatibility
2751 * New function `group_member' is a convenient way to check if a process has
2752 a given effective group ID.
2754 * When using GCC 2.7 and later, the socket functions are now declared in a
2755 special way so that passing an argument of type `struct sockaddr_in *',
2756 `struct sockaddr_ns *', or `struct sockaddr_un *' instead of the generic
2757 `struct sockaddr *' type, does not generate a type-clash warning.
2759 * New function `error' declared in header file <error.h> is a convenient
2760 function for printing error messages and optionally exiting; this is the
2761 canonical function used in GNU programs. The new functions `err', `warn',
2762 and friends in header file <err.h> are the canonical 4.4 BSD interface for
2763 doing the same thing.
2765 * The <glob.h> interface has several new flags from 4.4 BSD that extend the
2766 POSIX.2 `glob' function to do ~ and {...} expansion.
2768 * New function `unsetenv' complements `setenv' for compatibility with 4.4 BSD.
2769 `clearenv' which is used in POSIX.9 is also available.
2771 * New function `getsid' returns session ID number on systems that support it.
2773 * We have incorporated the 4.4 BSD `db' library (version 1.85). New header
2774 files <db.h> and <mpool.h> provide a rich set of functions for several
2775 types of simple databases stored in memory and in files, and <ndbm.h> is
2776 an old `ndbm'-compatible interface using the `db' functions. Link with
2777 `-ldb' to get these functions.
2779 * New macro `strdupa' copies a string like `strdup', but uses local stack
2780 space from `alloca' instead of dynamic heap space from `malloc'.
2782 * New function `strnlen' is like `strlen' but searches only a given maximum
2783 number of characters for the null terminator. `stpncpy', `strndup' and
2784 `strndupa' are similar variants for the `stpcpy', `strdup' and `strdupa'
2787 * New function `statfs' in header <sys/statfs.h>.
2789 * The new <argz.h> and <envz.h> interfaces contributed by Miles Bader
2790 provide convenient functions for operating on blocks of null-terminated
2793 * A new suite of functions in <utmp.h> handle all the details of reading
2794 and writing the utmp file.
2796 * An implementation of the NIS/YP(tm) based NSS service was contributed by
2799 * Paul Eggert and Ulrich Drepper modified the `strftime' function to be
2800 completely POSIX compliant and also implemented the extended functionality
2801 to handle alternate digit representation and alternate era date formats.
2803 * Ulrich Drepper provided an implementation of the `strptime' function
2804 defined in XPG4.2 which transforms a string into a `struct tm' value.
2806 * Paul Eggert provided the tzselect shell script as part of the timezone
2807 code. The shell script makes it easy to select the correct timezone
2810 * The implementation of the malloc family of functions is completely replaced
2811 by a new implementation by Doug Lea with many improvements by Wolfram Gloger.
2812 The implementation uses the mmap function (if available) and it is
2813 optimized for the use in multi threaded programs.
2815 * Ulrich Drepper contributed a MD5 "encryption" for the crypt family of
2816 functions. This new functionality is usable by specifying a special
2817 salt string and it is compatible with implementation on *BSD systems.
2819 * Lots of functions from the XPG4.2 standard were added by Ulrich Drepper:
2820 `getsubopt' to handle second level command line options, `bsd_signal'
2821 to access BSD style `signal' functionality, the obsolete `regexp' style
2824 * the `lchown' function is available on system which support this
2827 * The implementation of the shadow password handling function was contributed
2830 * David Mosberger-Tang changed the SunRPC implementation to be 64bit safe.
2832 * POSIX.1g support was added. The <sys/select.h> header is available,
2833 `isfdtype' and `pselect' are implemented. Craig Metz contributed an
2834 implementation of `getaddrinfo'.
2838 * For cross-compilation you should now set `BUILD_CC' instead of `HOST_CC'.
2840 * New header file <fstab.h> and new functions `getfsspec', `getfsent' and
2841 friends, for parsing /etc/fstab. This code comes from 4.4 BSD.
2843 * The new function `daemon' from 4.4 BSD is useful for server programs that
2844 want to put themselves in the background.
2846 * Joel Sherrill has contributed support for several standalone boards that
2847 run without an operating system.
2849 * `printf', `scanf' and friends now accept a `q' type modifier for long
2850 long int as well as `ll'. Formats using these might be `%qu' or `%lld'.
2852 * All of the code taken from BSD (notably most of the math and networking
2853 routines) has been updated from the BSD 4.4-Lite release.
2855 * The resolver code has been updated from the BIND-4.9.3-BETA9 release.
2857 * The new functions `getdomainname' and `setdomainname' fetch or change the
2858 YP/NIS domain name. These are system calls which exist on systems which
2861 * The time zone data files have been updated for the latest international
2864 * The SunRPC programs `portmap' and `rpcinfo' are now installed in
2865 $(sbindir) (usually /usr/local/sbin) instead of $(bindir).
2869 * The C library now includes support for Sun RPC, from Sun's free
2870 RPCSRC-4.0 distribution. The `portmap', `rpcinfo', and `rpcgen' programs
2871 are included. (There is still no support for YP.)
2873 * Tom Quinn has contributed a port of the C library to SGI machines running
2874 Irix 4 (mips-sgi-irix4).
2876 * The new `lockf' function is a simplified interface to the locking
2877 facilities of `fcntl', included for compatibility.
2879 * New time functions `timegm', `timelocal', and `dysize' for compatibility.
2881 * New header file <sys/timeb.h> and new function `ftime' for compatibility.
2883 * New header files <poll.h> and <sys/poll.h> and new function `poll' for
2886 * The error message printed by `assert' for a failed assertion now includes
2887 the name of the program (if using GNU ld) and the name of the calling
2888 function (with versions of GCC that support this).
2890 * The `psignal' function is now declared in <signal.h>, not <stdio.h>.
2892 * The library now includes the <sys/mman.h> header file and memory
2893 management functions `mmap', `munmap', `mprotect', `msync', and
2894 `madvise', on systems that support those facilities.
2896 * The interface for `mcheck' has changed slightly: the function called to
2897 abort the program when an allocation inconsistency is detected now takes
2898 an argument that indicates the type of failure. The new function
2899 `mprobe' lets you request a consistency check for a particular block at
2900 any time (checks are normally done only when you call `free' or `realloc'
2903 * It is now possible to easily cross-compile the C library, building on one
2904 system a library to run on another machine and/or operating system. All
2905 you need to do is set the variable `HOST_CC' in `configparms' to the
2906 native compiler for programs to run on the machine you are building on (a
2907 few generator programs are used on Unix systems); set `CC' to the
2910 * The new function `fexecve' (only implemented on the GNU system) executes
2911 a program file given a file descriptor already open on the file.
2915 * Brendan Kehoe has contributed most of a port to the DEC Alpha
2916 running OSF/1 (alpha-dec-osf1). He says it is 75% complete.
2918 * You can set the variable `libprefix' in `configparms' to specify a prefix
2919 to be prepended to installed library files; this makes it easy to install
2920 the GNU C library to be linked as `-lgnuc' or whatever.
2922 * The new `stpncpy' is a cross between `stpcpy' and `strncpy': It
2923 copies a limited number of characters from a string, and returns the
2924 address of the last character written.
2926 * You no longer need to check for whether the installed `stddef.h' is
2927 compatible with the GNU C library. configure now checks for you.
2929 * You can now define a per-stream `fileno' function to convert the
2930 stream's cookie into an integral file descriptor.
2932 * ``malloc (0)'' no longer returns a null pointer. Instead, it
2933 allocates zero bytes of storage, and returns a unique pointer which
2934 you can pass to `realloc' or `free'. The behavior is undefined if
2935 you dereference this pointer.
2937 * The C library now runs on Sony NEWS m68k machines running either
2938 NewsOS 3 or NewsOS 4.
2940 * The new `syscall' function is a system-dependent primitive function
2941 for invoking system calls. It has the canonical behavior on Unix
2942 systems, including unreliable return values for some calls (such as
2943 `pipe', `fork' and `getppid').
2945 * The error code `EWOULDBLOCK' is now obsolete; it is always defined
2946 to `EAGAIN', which is the preferred name. On systems whose kernels
2947 use two distinct codes, the C library now translates EWOULDBLOCK to
2948 EAGAIN in every system call function.
2952 * The GNU C Library Reference Manual is now distributed with the library.
2953 `make dvi' will produce a DVI file of the printed manual.
2954 `make info' will produce Info files that you can read on line using C-h i
2955 in Emacs or the `info' program.
2956 Please send comments on the manual to bug-glibc-manual@gnu.org.
2958 * The library now supports SVR4 on i386s (i386-unknown-sysv4).
2960 * Brendan Kehoe has contributed a port to Sun SPARCs running Solaris 2.
2962 * Jason Merrill has contributed a port to the Sequent Symmetry running
2963 Dynix version 3 (i386-sequent-dynix).
2965 * The library has been ported to i386s running SCO 3.2.4 (also known as SCO
2966 ODT 2.0; i386-unknown-sco3.2.4) or SCO 3.2 (i386-unknown-sco3.2).
2968 * New function `memory_warnings' lets you arrange to get warnings when
2969 malloc is running out of memory to allocate, like Emacs gives you.
2971 * The C library now contains the relocating allocator used in Emacs 19 for
2972 its editing buffers. This allocator (ralloc) minimizes allocation
2973 overhead and fragmentation by moving allocated regions around whenever it
2974 needs to. You always refer to a ralloc'd region with a "handle" (a
2975 pointer to a pointer--an object of type `void **').
2977 * There is a new `printf' format: `%m' gives you the string corresponding
2978 to the error code in `errno'.
2980 * In `scanf' formats, you can now use `%as' or `%a[' to do the normal `%s'
2981 or `%[' conversion, but instead of filling in a fixed-sized buffer you
2982 pass, the `a' modifier says to fill in a `char **' you pass with a
2985 * The `fnmatch' function supports the new flag bits `FNM_LEADING_DIR' and
2986 `FNM_CASEFOLD'. `FNM_LEADING_DIR' lets a pattern like `foo*' match a
2987 name like `foo/bar'. `FNM_CASEFOLD' says to ignore case in matching.
2989 * `mkstemp' is a traditional Unix function to atomically create and open a
2990 uniquely-named temporary file.
2994 * The standard location for the file that says what the local timezone is
2995 has changed again. It is now `/usr/local/etc/localtime' (or more
2996 precisely, `${prefix}/etc/localtime') rather than `/etc/localtime'.
2998 * The distribution no longer contains any files with names longer than 14
3001 * `struct ttyent' has two new flag bits: TTY_TRUSTED and TTY_CONSOLE.
3002 These are set by the new `trusted' and `console' keywords in `/etc/ttys'.
3004 * New functions `ttyslot' and `syslog' from 4.4 BSD.
3008 * The configuration process has changed quite a bit. The `configure'
3009 script is now used just like the configuration scripts for other GNU
3010 packages. The `sysdeps' directory hierarchy is much rearranged.
3011 The file `INSTALL' explains the new scheme in detail.
3013 * The header files no longer need to be processed into ANSI C and
3014 traditional C versions. There is just one set of files to install, and
3015 it will work with ANSI or old C compilers (including `gcc -traditional').
3017 * Brendan Kehoe and Ian Lance Taylor have ported the library to the
3018 MIPS DECStation running Ultrix 4.
3020 * The Sun 4 startup code (crt0) can now properly load SunOS 4 shared libraries.
3021 Tom Quinn contributed the initial code. The GNU C library can NOT yet be
3022 made itself into a shared library.
3024 * Yet further improved support for the i386, running 4.3 BSD-like systems
3025 (such as Mach 3 with the Unix single-server), or System V.
3027 * New function `strncasecmp' to do case-insensitive string comparison
3028 with limited length.
3030 * New function `strsep' is a reentrant alternative to `strtok'.
3032 * New functions `scandir' and `alphasort' for searching directories.
3034 * New function `setenv' is a better interface to `putenv'.
3036 * Ian Lance Taylor has contributed an implementation of the SVID `ftw'
3037 function for traversing a directory tree.
3039 * The GNU obstack package is now also part of the C library.
3040 The new function `open_obstack_stream' creates a stdio stream that
3041 writes onto an obstack; `obstack_printf' and `obstack_vprintf' do
3042 formatted output directly to an obstack.
3044 * Miscellaneous new functions: reboot, nice, sigaltstack (4.4 BSD only),
3045 cfmakeraw, getusershell, getpass, swab, getttyent, seteuid, setegid.
3047 * `FNM_FILE_NAME' is another name for `FNM_PATHNAME', used with `fnmatch'.
3049 * The new functions `strfry' and `memfrob' do mysterious and wonderful
3050 things to your strings.
3052 * There are some new test programs: test-fseek, testmb, and testrand.
3054 * Some work has been done to begin porting the library to 4.4 BSD and Linux.
3055 These ports are not finished, but are a good starting place for really
3056 supporting those systems.
3058 * `/etc/localtime' is now the standard location for the file that says what
3059 the local timezone is, rather than `/usr/local/lib/zoneinfo/localtime'.
3060 This follows the general principle that `/etc' is the place for all local
3061 configuration files.
3063 * The C library header files now use `extern "C"' when used by the C++
3064 compiler, so the C library should now work with C++ code.
3066 * The header file <bstring.h> is gone. <string.h> now declares bcopy,
3067 bcmp, bzero, and ffs. (Update: nowadays these functions are declared
3070 * Mike Haertel (of GNU e?grep and malloc fame) has written a new sorting
3071 function which uses the `merge sort' algorithm, and is said to be
3072 significantly faster than the old GNU `qsort' function. Merge sort is
3073 now the standard `qsort' function. The new algorithm can require a lot
3074 of temporary storage; so, the old sorting function is called when the
3075 required storage is not available.
3077 * The C library now includes Michael Glad's Ultra Fast Crypt, which
3078 provides the Unix `crypt' function, plus some other entry points.
3080 * The code and header files taken from 4.4 BSD have been updated with the
3081 latest files released from Berkeley.
3083 ----------------------------------------------------------------------
3084 Copyright information:
3086 Copyright (C) 1992-2016 Free Software Foundation, Inc.
3088 Permission is granted to anyone to make or distribute verbatim copies
3089 of this document as received, in any medium, provided that the
3090 copyright notice and this permission notice are preserved,
3091 thus giving the recipient permission to redistribute in turn.
3093 Permission is granted to distribute modified versions
3094 of this document, or of portions of it,
3095 under the above conditions, provided also that they
3096 carry prominent notices stating who last changed them.
3099 version-control: never