1 GNU C Library NEWS -- history of user-visible changes.
2 Copyright (C) 1992-2015 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 following bugs are resolved with this release:
12 4719, 14841, 13064, 14094, 15319, 15467, 15790, 15969, 16351, 16560,
13 16783, 17269, 17523, 17569, 17588, 17711, 17792, 17836, 17912, 17916,
14 17932, 17944, 17949, 17964, 17965, 17967, 17969, 17978, 17987, 17991,
15 17996, 17998, 17999, 18019, 18020, 18029, 18030, 18032, 18038, 18039,
18 * Character encoding and ctype tables were updated to Unicode 7.0.0, using
19 new generator scripts contributed by Pravin Satpute and Mike FABIAN (Red
20 Hat). These updates cause user visible changes, such as the fix for bug
26 * The following bugs are resolved with this release:
28 6652, 10672, 12674, 12847, 12926, 13862, 14132, 14138, 14171, 14498,
29 15215, 15378, 15884, 16009, 16418, 16191, 16469, 16576, 16617, 16618,
30 16619, 16657, 16740, 16857, 17192, 17266, 17273, 17344, 17363, 17370,
31 17371, 17411, 17460, 17475, 17485, 17501, 17506, 17508, 17522, 17555,
32 17570, 17571, 17572, 17573, 17574, 17582, 17583, 17584, 17585, 17589,
33 17594, 17601, 17608, 17616, 17625, 17630, 17633, 17634, 17635, 17647,
34 17653, 17657, 17658, 17664, 17665, 17668, 17682, 17702, 17717, 17719,
35 17722, 17723, 17724, 17725, 17732, 17733, 17744, 17745, 17746, 17747,
36 17748, 17775, 17777, 17780, 17781, 17782, 17791, 17793, 17796, 17797,
37 17801, 17803, 17806, 17834, 17844, 17848, 17868, 17869, 17870, 17885,
40 * CVE-2015-1472 CVE-2015-1473 Under certain conditions wscanf can allocate
41 too little memory for the to-be-scanned arguments and overflow the
42 allocated buffer. The implementation now correctly computes the required
43 buffer size when using malloc, and switches to malloc from alloca as
46 * A new semaphore algorithm has been implemented in generic C code for all
47 machines. Previous custom assembly implementations of semaphore were
48 difficult to reason about or ensure that they were safe. The new version
49 of semaphore supports machines with 64-bit or 32-bit atomic operations.
50 The new semaphore algorithm is used by sem_init, sem_open, sem_post,
51 sem_wait, sem_timedwait, sem_trywait, and sem_getvalue.
53 * Port to Altera Nios II has been contributed by Mentor Graphics.
55 * Optimized strcpy, stpcpy, strncpy, stpncpy, strcmp, and strncmp
56 implementations for powerpc64/powerpc64le.
57 Implemented by Adhemerval Zanella (IBM).
59 * Added support for TSX lock elision of pthread mutexes on powerpc32, powerpc64
60 and powerpc64le. This may improve lock scaling of existing programs on
61 HTM capable systems. The lock elision code is only enabled with
62 --enable-lock-elision=yes. Also, the TSX lock elision implementation for
63 powerpc will issue a transaction abort on every syscall to avoid side
64 effects being visible outside transactions.
66 * Optimized strcpy, stpcpy, strchrnul and strrchr implementations for
67 AArch64. Contributed by ARM Ltd.
69 * i386 memcpy functions optimized with SSE2 unaligned load/store.
71 * CVE-2104-7817 The wordexp function could ignore the WRDE_NOCMD flag
72 under certain input conditions resulting in the execution of a shell for
73 command substitution when the application did not request it. The
74 implementation now checks WRDE_NOCMD immediately before executing the
75 shell and returns the error WRDE_CMDSUB as expected.
77 * CVE-2012-3406 printf-style functions could run into a stack overflow when
78 processing format strings with a large number of format specifiers.
80 * CVE-2014-9402 The nss_dns implementation of getnetbyname could run into an
81 infinite loop if the DNS response contained a PTR record of an unexpected
84 * The minimum GCC version that can be used to build this version of the GNU
85 C Library is GCC 4.6. Older GCC versions, and non-GNU compilers, can
86 still be used to compile programs using the GNU C Library.
88 * The GNU C Library is now built with -Werror by default. This can be
89 disabled by configuring with --disable-werror.
91 * New locales: tu_IN, bh_IN, raj_IN, ce_RU.
93 * The obsolete sigvec function has been removed. This was the original
94 4.2BSD interface that inspired the POSIX.1 sigaction interface, which
95 programs have been using instead for about 25 years. Of course, ABI
96 compatibility for old binaries using sigvec remains intact.
98 * Merged gettext 0.19.3 into the intl subdirectory. This fixes building
99 with newer versions of bison.
101 * Support for MIPS o32 FPXX, FP64A and FP64 ABI Extensions.
102 The original MIPS o32 hard-float ABI requires an FPU where double-precision
103 registers overlay two consecutive single-precision registers. MIPS32R2
104 introduced a new FPU mode (FR=1) where double-precision registers extend the
105 corresponding single-precision registers which is incompatible with the
106 o32 hard-float ABI. The MIPS SIMD ASE and the MIPSR6 architecture both
107 require the use of FR=1 making a transition necessary. New o32 ABI
108 extensions enable users to migrate over time from the original o32 ABI
109 through to the updated o32 FP64 ABI. To achieve this the dynamic linker now
110 tracks the ABI of any loaded object and verifies that new objects are
111 compatible. Mode transitions will also be requested as required and
112 unsupportable objects will be rejected. The ABI checks include both soft and
113 hard float ABIs for o32, n32 and n64.
115 GCC 5 with GNU binutils 2.25 onwards:
116 It is strongly recommended that all o32 system libraries are built using the
117 new o32 FPXX ABI (-mfpxx) to facilitate the transition as this is compatible
118 with the original and all new o32 ABI extensions. Configure a MIPS GCC
119 compiler using --with-fp-32=xx to set this by default.
123 * The following bugs are resolved with this release:
125 6804, 9894, 12994, 13347, 13651, 14308, 14770, 15119, 15132, 15347, 15514,
126 15698, 15804, 15894, 15946, 16002, 16064, 16095, 16194, 16198, 16275,
127 16284, 16287, 16315, 16348, 16349, 16354, 16357, 16362, 16447, 16516,
128 16532, 16539, 16545, 16561, 16562, 16564, 16574, 16599, 16600, 16609,
129 16610, 16611, 16613, 16619, 16623, 16629, 16632, 16634, 16639, 16642,
130 16648, 16649, 16670, 16674, 16677, 16680, 16681, 16683, 16689, 16695,
131 16701, 16706, 16707, 16712, 16713, 16714, 16724, 16731, 16739, 16740,
132 16743, 16754, 16758, 16759, 16760, 16770, 16786, 16789, 16791, 16796,
133 16799, 16800, 16815, 16823, 16824, 16831, 16838, 16839, 16849, 16854,
134 16876, 16877, 16878, 16882, 16885, 16888, 16890, 16892, 16912, 16915,
135 16916, 16917, 16918, 16922, 16927, 16928, 16932, 16943, 16958, 16965,
136 16966, 16967, 16977, 16978, 16984, 16990, 16996, 17009, 17022, 17031,
137 17042, 17048, 17050, 17058, 17061, 17062, 17069, 17075, 17078, 17079,
138 17084, 17086, 17088, 17092, 17097, 17125, 17135, 17137, 17150, 17153,
139 17187, 17213, 17259, 17261, 17262, 17263, 17319, 17325, 17354.
141 * Reverted change of ABI data structures for s390 and s390x:
142 On s390 and s390x the size of struct ucontext and jmp_buf was increased in
143 2.19. This change is reverted in 2.20. The introduced 2.19 symbol versions
144 of getcontext, setjmp, _setjmp, __sigsetjmp, longjmp, _longjmp, siglongjmp
145 are preserved pointing straight to the same implementation as the old ones.
146 Given that, new callers will simply provide a too-big buffer to these
147 functions. Any applications/libraries out there that embed jmp_buf or
148 ucontext_t in an ABI-relevant data structure that have already been rebuilt
149 against 2.19 headers will have to rebuilt again. This is necessary in any
150 case to revert the breakage in their ABI caused by the glibc change.
152 * Support for file description locks is added to systems running the
153 Linux kernel. The standard file locking interfaces are extended to
154 operate on file descriptions, not file descriptors, via the use of
155 F_OFD_GETLK, F_OFD_SETLK, and F_OFD_SETLKW. File description locks
156 are associated with an open file instead of a process.
158 * Optimized strchr implementation for AArch64. Contributed by ARM Ltd.
160 * The minimum Linux kernel version that this version of the GNU C Library
161 can be used with is 2.6.32.
163 * Running the testsuite no longer terminates as soon as a test fails.
164 Instead, a file tests.sum (xtests.sum from "make xcheck") is generated,
165 with PASS or FAIL lines for individual tests. A summary of the results is
166 printed, including a list of failing lists, and "make check" exits with
167 error status if there were any unexpected failures. "make check
168 stop-on-test-failure=y" may be used to keep the old behavior.
170 * The am33 port, which had not worked for several years, has been removed
173 * The _BSD_SOURCE and _SVID_SOURCE feature test macros are no longer
174 supported; they now act the same as _DEFAULT_SOURCE (but generate a
175 warning). Except for cases where _BSD_SOURCE enabled BSD interfaces that
176 conflicted with POSIX (support for which was removed in 2.19), the
177 interfaces those macros enabled remain available when compiling with
178 _GNU_SOURCE defined, with _DEFAULT_SOURCE defined, or without any feature
181 * Optimized strcmp implementation for ARMv7. Contributed by ARM Ltd.
183 * Added support for TX lock elision of pthread mutexes on s390 and s390x.
184 This may improve lock scaling of existing programs on TX capable systems.
185 The lock elision code is only built with --enable-lock-elision=yes and
186 then requires a GCC version supporting the TX builtins. With lock elision
187 default mutexes are elided via __builtin_tbegin, if the cpu supports
188 transactions. By default lock elision is not enabled and the elision code
191 * CVE-2014-4043 The posix_spawn_file_actions_addopen implementation did not
192 copy the path argument. This allowed programs to cause posix_spawn to
193 deference a dangling pointer, or use an unexpected pathname argument if
194 the string was modified after the posix_spawn_file_actions_addopen
197 * All supported architectures now use the main glibc sysdeps directory
198 instead of some being in a separate "ports" directory (which was
199 distributed separately before glibc 2.17).
201 * The NPTL implementation of POSIX pthreads is no longer an "add-on".
202 On configurations that support it (all Linux configurations), it's now
203 used regardless of the --enable-add-ons switch to configure. It is no
204 longer possible to build such configurations without pthreads support.
206 * Locale names, including those obtained from environment variables (LANG
207 and the LC_* variables), are more tightly checked for proper syntax.
208 setlocale will now fail (with EINVAL) for locale names that are overly
209 long, contain slashes without starting with a slash, or contain ".." path
210 components. (CVE-2014-0475) Previously, some valid locale names were
211 silently replaced with the "C" locale when running in AT_SECURE mode
212 (e.g., in a SUID program). This is no longer necessary because of the
215 * On x86-64, the dynamic linker's lazy-binding support is now compatible
216 with application code using Intel MPX instructions. (With all previous
217 versions, the MPX register state could be clobbered when making calls
218 into or out of a shared library.) Note that while the new dynamic
219 linker is compatible with all known x86 hardware whether or not it
220 supports Intel MPX, some x86 instruction-set emulators might fail to
221 handle the new instruction encodings. This is known to affect Valgrind
222 versions up through 3.9 (but will be fixed in the forthcoming 3.10
223 release), and might affect other tools that do instruction emulation.
225 * Support for loadable gconv transliteration modules has been removed.
226 The support for transliteration modules has been non-functional for
227 over a decade, and the removal is prompted by security defects. The
228 normal gconv conversion modules are still supported. Transliteration
229 with //TRANSLIT is still possible, and the //IGNORE specifier
230 continues to be supported. (CVE-2014-5119)
232 * Decoding a crafted input sequence in the character sets IBM933, IBM935,
233 IBM937, IBM939, IBM1364 could result in an out-of-bounds array read,
234 resulting a denial-of-service security vulnerability in applications which
235 use functions related to iconv. (CVE-2014-6040)
239 * The following bugs are resolved with this release:
241 156, 387, 431, 762, 832, 926, 2801, 4772, 6786, 6787, 6807, 6810, 6981,
242 7003, 9721, 9954, 10253, 10278, 11087, 11157, 11214, 12100, 12486, 12751,
243 12986, 13028, 13982, 13985, 14029, 14032, 14120, 14143, 14155, 14286,
244 14547, 14699, 14752, 14782, 14876, 14910, 15004, 15048, 15073, 15089,
245 15128, 15218, 15268, 15277, 15308, 15362, 15374, 15400, 15425, 15427,
246 15483, 15522, 15531, 15532, 15593, 15601, 15608, 15609, 15610, 15632,
247 15640, 15670, 15672, 15680, 15681, 15723, 15734, 15735, 15736, 15748,
248 15749, 15754, 15760, 15763, 15764, 15797, 15799, 15825, 15843, 15844,
249 15846, 15847, 15849, 15850, 15855, 15856, 15857, 15859, 15867, 15886,
250 15887, 15890, 15892, 15893, 15895, 15897, 15901, 15905, 15909, 15915,
251 15917, 15919, 15921, 15923, 15939, 15941, 15948, 15963, 15966, 15968,
252 15985, 15988, 15997, 16032, 16034, 16036, 16037, 16038, 16041, 16046,
253 16055, 16071, 16072, 16074, 16077, 16078, 16103, 16112, 16143, 16144,
254 16146, 16150, 16151, 16153, 16167, 16169, 16172, 16195, 16214, 16245,
255 16271, 16274, 16283, 16289, 16293, 16314, 16316, 16330, 16337, 16338,
256 16356, 16365, 16366, 16369, 16372, 16375, 16379, 16381, 16384, 16385,
257 16386, 16387, 16390, 16394, 16398, 16400, 16407, 16408, 16414, 16430,
258 16431, 16453, 16474, 16506, 16510, 16529
260 * Slovenian translations for glibc messages have been contributed by the
261 Translation Project's Slovenian team of translators.
263 * The public headers no longer use __unused nor __block. This change is to
264 support compiling programs that are derived from BSD sources and use
265 __unused internally, and to support compiling with Clang's -fblock
266 extension which uses __block.
268 * CVE-2012-4412 The strcoll implementation caches indices and rules for
269 large collation sequences to optimize multiple passes. This cache
270 computation may overflow for large collation sequences and may cause a
271 stack or buffer overflow. This is now fixed to use a slower algorithm
272 which does not use a cache if there is an integer overflow.
274 * CVE-2012-4424 The strcoll implementation uses malloc to cache indices and
275 rules for large collation sequences to optimize multiple passes and falls
276 back to alloca if malloc fails, resulting in a possible stack overflow.
277 The implementation now falls back to an uncached collation sequence lookup
280 * CVE-2013-4788 The pointer guard used for pointer mangling was not
281 initialized for static applications resulting in the security feature
282 being disabled. The pointer guard is now correctly initialized to a
283 random value for static applications. Existing static applications need
284 to be recompiled to take advantage of the fix (bug 15754).
286 * CVE-2013-4237 The readdir_r function could write more than NAME_MAX bytes
287 to the d_name member of struct dirent, or omit the terminating NUL
288 character. (Bugzilla #14699).
290 * CVE-2013-4332 The pvalloc, valloc, memalign, posix_memalign and
291 aligned_alloc functions could allocate too few bytes or corrupt the
292 heap when passed very large allocation size values (Bugzilla #15855,
295 * CVE-2013-4458 Stack overflow in getaddrinfo with large number of results
296 for AF_INET6 has been fixed (Bugzilla #16072).
298 * New locales: ak_GH, anp_IN, ar_SS, cmn_TW, hak_TW, lzh_TW, nan_TW, pap_AW,
299 pap_CW, quz_PE, the_NP.
301 * Substantially revised locales: gd_GB, ht_HT
303 * The LC_ADDRESS field was updated to support country_car for almost all
306 * ISO 1427 definitions were updated.
308 * ISO 3166 definitions were updated.
310 * The localedef utility now supports --big-endian and --little-endian
311 command-line options to generate locales for a different system from that
312 for which the C library was built.
314 * Binary locale files now only depend on the endianness of the system for
315 which they are generated and not on other properties of that system. As a
316 consequence, binary files generated with new localedef may be incompatible
317 with old versions of the GNU C Library, and binary files generated with
318 old localedef may be incompatible with this version of the GNU C Library,
319 in the following circumstances:
321 + Locale files may be incompatible on m68k systems.
323 + Locale archive files (but not separate files for individual locales) may
324 be incompatible on systems where plain "char" is signed.
326 * The configure option --disable-versioning has been removed. Builds with
327 --disable-versioning had not worked for several years.
329 * ISO 639 definitions were updated for Chiga (cgg) and Chinese (gan, hak, czh,
330 cjy, lzh, cmn, mnp, cdo, czo, cpx, wuu, hsn, yue).
332 * SystemTap probes for malloc have been introduced.
334 * SystemTap probes for slow multiple precision fallback paths of
335 transcendental functions have been introduced.
337 * Support for powerpc64le has been added.
339 * The soft-float powerpc port now supports e500 processors.
341 * Support for STT_GNU_IFUNC symbols added for ppc32/power4+ and ppc64.
343 * A new feature test macro _DEFAULT_SOURCE is available to enable the same
344 set of header declarations that are enabled by default, even when other
345 feature test macros or compiler options such as -std=c99 would otherwise
346 disable some of those declarations.
348 * The _BSD_SOURCE feature test macro no longer enables BSD interfaces that
349 conflict with POSIX. The libbsd-compat library (which was a dummy library
350 that did nothing) has also been removed.
352 * Preliminary documentation about Multi-Thread, Async-Signal and
353 Async-Cancel Safety has been added.
355 * Change of ABI data structures for s390 and s390x:
356 On s390 and s390x the size of struct ucontext and jmp_buf was increased to
357 allow for future hardware extensions. All library functions that accept or
358 return these structures were versioned in order to provide backwards
359 compatibility with existing code. However, not all cases can be handled
360 with interface versioning. If an application embeds either structure into
361 another structure and that structure is passed to another compilation unit
362 which expects the newer larger-sized object then any access to the new
363 fields will result in undefined behaviour. Similarly any access to fields
364 that were moved by the enlarging of the structures will cause undefined
365 behaviour. To fix the undefined behaviour all objects that are part of the
366 final in-memory image must agree on the size of structures, and this may
367 require recompilation.
371 * The following bugs are resolved with this release:
373 2546, 2560, 5159, 6809, 7006, 10060, 10062, 10283, 10357, 10686, 11120,
374 11561, 12310, 12387, 12492, 12515, 12723, 13550, 13889, 13951, 13988,
375 14142, 14176, 14200, 14256, 14280, 14293, 14317, 14327, 14478, 14496,
376 14582, 14686, 14812, 14888, 14894, 14907, 14908, 14909, 14920, 14952,
377 14964, 14981, 14982, 14985, 14991, 14994, 14996, 15000, 15003, 15006,
378 15007, 15014, 15020, 15022, 15023, 15036, 15054, 15055, 15062, 15078,
379 15084, 15085, 15086, 15100, 15160, 15214, 15221, 15232, 15234, 15283,
380 15285, 15287, 15304, 15305, 15307, 15309, 15327, 15330, 15335, 15336,
381 15337, 15339, 15342, 15346, 15359, 15361, 15366, 15380, 15381, 15394,
382 15395, 15405, 15406, 15409, 15416, 15418, 15419, 15423, 15424, 15426,
383 15429, 15431, 15432, 15441, 15442, 15448, 15465, 15480, 15485, 15488,
384 15490, 15492, 15493, 15497, 15506, 15529, 15536, 15553, 15577, 15583,
385 15618, 15627, 15631, 15654, 15655, 15666, 15667, 15674, 15711, 15755,
388 * CVE-2013-2207 Incorrectly granting access to another user's pseudo-terminal
389 has been fixed by disabling the use of pt_chown (Bugzilla #15755).
390 Distributions can re-enable building and using pt_chown via the new configure
391 option `--enable-pt_chown'. Enabling the use of pt_chown carries with it
392 considerable security risks and should only be used if the distribution
393 understands and accepts the risks.
395 * CVE-2013-0242 Buffer overrun in regexp matcher has been fixed (Bugzilla
398 * CVE-2013-1914 Stack overflow in getaddrinfo with many results has been
399 fixed (Bugzilla #15330).
401 * Add support for calling C++11 thread_local object destructors on thread
402 and program exit. This needs compiler support for offloading C++11
403 destructor calls to glibc.
405 * Improved worst case performance of libm functions with double inputs and
408 * Support for priority inherited mutexes in pthread condition variables on
409 non-x86 architectures.
411 * Port to Xilinx MicroBlaze contributed by David Holsgrove.
413 * Optimized string functions for AArch64. Implemented by Marcus Shawcroft.
415 * Optimized string functions for ARM. Implemented by Will Newton and
418 * Optimized libm functions for SPARC. Implemented by David S. Miller.
420 * Support for building more of ARM glibc as Thumb-2 code. Implemented by
423 * Support for building most of MIPS glibc as MIPS16 code. Implemented by
424 Chung-Lin Tang, Maciej W. Rozycki and Maxim Kuvyrkov.
426 * Added a benchmark framework to track performance of functions in glibc.
428 * New <math.h> macro named issignaling to check for a signaling NaN (sNaN).
429 It is based on draft TS 18661 and currently enabled as a GNU extension.
431 * On Linux, the clock function now uses the clock_gettime system call
432 for improved precision, rather than old times system call.
434 * Added support for version-3 tz format files. This is needed when using
435 the tz database release 2013e or later, and affects a few unusual cases --
436 currently only TZ='America/Godthab' for time stamps after 2037.
438 * Added new API functions pthread_getattr_default_np and
439 pthread_setattr_default_np to get and set the default pthread
440 attributes of a process.
442 * Added support for TSX lock elision for pthread mutexes on i386 and x86-64.
443 This may improve lock scaling of existing programs on TSX capable systems.
444 When the --enable-lock-elision=yes parameter is specified at configure
445 time lock elision will be enabled by default for all PTHREAD_MUTEX_DEFAULT
448 * Support added for AT_HWCAP2 (to coincide with Linux kernel 3.10
449 availability). Implemented by Ryan S. Arnold.
451 * Support added for POWER8 platform. Implemented by Ryan S. Arnold.
455 * The following bugs are resolved with this release:
457 1349, 3439, 3479, 3665, 5044, 5246, 5298, 5400, 6530, 6677, 6778, 6808,
458 9685, 9914, 10014, 10038, 10114, 10191, 10631, 10873, 11438, 11607, 11638,
459 11741, 12140, 13013, 13412, 13542, 13601, 13603, 13604, 13629, 13679,
460 13696, 13698, 13717, 13741, 13759, 13761, 13763, 13881, 13939, 13950,
461 13952, 13966, 14042, 14047, 14090, 14150, 14151, 14152, 14154, 14157,
462 14166, 14173, 14195, 14197, 14237, 14246, 14251, 14252, 14283, 14298,
463 14303, 14307, 14328, 14331, 14336, 14337, 14347, 14349, 14368, 14376,
464 14417, 14447, 14459, 14476, 14477, 14501, 14505, 14510, 14516, 14518,
465 14519, 14530, 14532, 14538, 14543, 14544, 14545, 14557, 14562, 14568,
466 14576, 14579, 14583, 14587, 14595, 14602, 14610, 14621, 14638, 14645,
467 14648, 14652, 14660, 14661, 14669, 14672, 14683, 14694, 14716, 14719,
468 14743, 14767, 14783, 14784, 14785, 14793, 14796, 14797, 14801, 14803,
469 14805, 14807, 14811, 14815, 14821, 14822, 14824, 14828, 14831, 14833,
470 14835, 14838, 14856, 14863, 14865, 14866, 14868, 14869, 14871, 14872,
471 14879, 14889, 14893, 14898, 14914.
473 * Optimization of memcpy for MIPS.
475 * CVE-2011-4609 svc_run() produces high cpu usage when accept fails with
476 EMFILE has been fixed (Bugzilla #14889).
478 * The add-on ports collection is now distributed in the "ports" subdirectory
479 of the main GNU C Library distribution, rather than separately.
481 * Port to ARM AArch64 contributed by Linaro.
483 * Support for STT_GNU_IFUNC symbols added for s390 and s390x.
484 Optimized versions of memcpy, memset, and memcmp added for System z10 and
486 Implemented by Andreas Krebbel.
488 * The new function secure_getenv allows secure access to the environment,
489 returning NULL if running in a SUID/SGID process. This function replaces
490 the internal function __secure_getenv.
492 * SystemTap static probes have been added into the dynamic linker.
493 Implemented by Gary Benson.
495 * Optimizations of string functions strstr, strcasestr and memmem.
496 Implemented by Maxim Kuvyrkov.
498 * The minimum Linux kernel version that this version of the GNU C Library
499 can be used with is 2.6.16.
501 * Optimizations of string functions memchr, wcschr, wcscpy, and wcsrchr for
502 powerpc POWER7. Implemented by Will Schmidt.
504 * New configure option --disable-nscd builds the C library such that it
505 never attempts to contact the Name Service Caching Daemon (nscd).
506 New configure option --disable-build-nscd avoids building nscd itself;
507 this is the default if --disable-nscd is used.
509 * Improved support for cross-compilation, including cross-testing and
510 bootstrap builds without a previously built glibc.
512 * Several testsuite tests are now able to test multiple IFUNC variants of an
513 interface, rather than just testing the one that would be chooen by
516 * New configure options --with-bugurl and --with-pkgversion, for
517 distributors to use to embed their bug-reporting and package version
518 information in --help and --version output.
520 * The ttyname and ttyname_r functions on Linux now fall back to searching for
521 the tty file descriptor in /dev/pts or /dev if /proc is not available. This
522 allows creation of chroots without the procfs mounted on /proc.
524 * The `crypt' function now fails if passed salt bytes that violate the
525 specification for those values. On Linux, the `crypt' function will
526 consult /proc/sys/crypto/fips_enabled to determine if "FIPS mode" is
527 enabled, and fail on encrypted strings using the MD5 or DES algorithm
528 when the mode is enabled.
530 * The `clock_*' suite of functions (declared in <time.h>) is now available
531 directly in the main C library. Previously it was necessary to link with
532 -lrt to use these functions. This change has the effect that a
533 single-threaded program that uses a function such as `clock_gettime' (and
534 is not linked with -lrt) will no longer implicitly load the pthreads
535 library at runtime and so will not suffer the overheads associated with
536 multi-thread support in other code such as the C++ runtime library.
538 * New locales: ayc_PE, doi_IN, ia_FR, mni_IN, nhn_MX, niu_NU, niu_NZ,
543 * The following bugs are resolved with this release:
545 174, 208, 350, 369, 411, 706, 766, 887, 2074, 2541, 2547, 2548, 2550,
546 2551, 2552, 2553, 2554, 2562, 2563, 2565, 2566, 2570, 2576, 2636, 2678,
547 3335, 3440, 3748, 3768, 3866, 3868, 3906, 3976, 3992, 4026, 4108, 4596,
548 4822, 5077, 5461, 5805, 5993, 6471, 6486, 6578, 6649, 6730, 6770, 6794,
549 6884, 6890, 6894, 6895, 6907, 6911, 6959, 7064, 9739, 9902, 10110, 10135,
550 10140, 10153, 10210, 10254, 10346, 10375, 10545, 10716, 10846, 11174,
551 11261, 11322, 11365, 11451, 11494, 11521, 11677, 11837, 11959, 12047,
552 12097, 12193, 12194, 12297, 12298, 12301, 12340, 12354, 12416, 12495,
553 13058, 13223, 13361, 13525, 13526, 13527, 13528, 13529, 13530, 13531,
554 13532, 13533, 13547, 13551, 13552, 13553, 13555, 13556, 13559, 13563,
555 13566, 13576, 13579, 13583, 13592, 13594, 13613, 13618, 13637, 13656,
556 13658, 13673, 13691, 13695, 13704, 13705, 13706, 13718, 13726, 13738,
557 13739, 13743, 13750, 13758, 13760, 13761, 13775, 13786, 13787, 13792,
558 13806, 13824, 13840, 13841, 13844, 13846, 13848, 13851, 13852, 13854,
559 13871, 13872, 13873, 13879, 13882, 13883, 13884, 13885, 13886, 13892,
560 13895, 13908, 13910, 13911, 13912, 13913, 13914, 13915, 13916, 13917,
561 13918, 13919, 13920, 13921, 13922, 13923, 13924, 13926, 13927, 13928,
562 13938, 13941, 13942, 13954, 13955, 13956, 13963, 13967, 13968, 13970,
563 13973, 13979, 13983, 13986, 13996, 14012, 14027, 14033, 14034, 14036,
564 14040, 14043, 14044, 14048, 14049, 14050, 14053, 14055, 14059, 14064,
565 14075, 14080, 14083, 14103, 14104, 14109, 14112, 14117, 14122, 14123,
566 14134, 14153, 14183, 14188, 14199, 14210, 14218, 14229, 14241, 14273,
569 * Support for the x32 ABI on x86-64 added. The x32 target is selected by
570 configuring glibc with:
571 BUILD_CC='gcc' CC='gcc -mx32' CXX='g++ -mx32'
572 Visit <http://sites.google.com/site/x32abi/> for more x32 ABI info.
573 Implemented by H.J. Lu.
577 + define static_assert
579 + do not declare gets
581 + declare at_quick_exit and quick_exit also for ISO C11
583 + aligned_alloc. NB: The code is deliberately allows the size parameter
584 to not be a multiple of the alignment. This is a moronic requirement
585 in the standard but it is only a requirement on the caller, not the
590 + uchar.h support added
592 + CMPLX, CMPLXF, CMPLXL added
594 Implemented by Ulrich Drepper.
596 * Support for the IA-64 has been moved to ports.
598 * Remove support for anything but ELF binary format
600 * Checking versions of poll, ppoll added.
601 Implemented by Ulrich Drepper.
603 * More generic and 64-bit performance optimizations to math functions.
604 Implemented by Ulrich Drepper.
606 * New configure option --enable-obsolete-rpc makes the deprecated RPC
607 headers and functions available at compile time as they were before
608 version 2.14. This option will be removed at some time in the future
609 after the TI-RPC library becomes fully sufficient for the needs of
610 existing applications.
612 * Compatibility code for Linux kernel versions before 2.4 has been removed.
613 Note that glibc is not expected to work with any Linux kernel version
616 * New header <sys/auxv.h> and function getauxval allowing easy access to
617 the AT_* key-value pairs passed from the Linux kernel. The header also
618 defines the HWCAP_* bits associated with the AT_HWCAP key.
620 * New locales: mag_IN
622 * New configure option --enable-systemtap builds SystemTap static probes
623 into libc for setjmp and longjmp and into libpthread for various operations.
624 So far the setjmp/longjmp probes and some of the libpthread probes are
625 provided only for i*86 and x86_64.
626 Implemented by Roland McGrath and Rayson Ho.
628 * Optimized expf for x86-32 and x86-64. Implemented by Liubov Dmitrieva.
630 * More optimized functions for PowerPC. Implemented by Adhemerval Zanella
633 * More optimized functions for SPARC. Implemented by David S. Miller.
635 * Improved support for cross-compilation, especially bootstrap builds
636 without a previously built glibc.
638 * Ports for the TILE-Gx and TILEPro families of processors. Contributed by
639 Chris Metcalf from Tilera.
641 * Support for the old ARM ABI has been removed from ports. Only the EABI is
642 now supported for ARM processors.
644 * The hard-float variant of the ARM EABI now uses /lib/ld-linux-armhf.so.3
645 as the name of the dynamic linker, to distinguish it from the
646 /lib/ld-linux.so.3 dynamic linker used for the base EABI.
648 * Support for CRIS has been removed from ports.
650 * A new class of installed header has been documented for low-level
651 platform-specific functionality. PowerPC added the first instance with a
652 function to provide time base register access. Contributed by Tulio
653 Magno Quites Machado Filho.
655 * ix86 configurations now install header files that are consistent with
656 what x86-64 configurations install. These same header files can be used
657 for -m32, -m64, or -mx32 builds.
658 Contributed by H.J. Lu.
660 * Math library bug fixes. A thorough audit of all open math library bugs was
661 conducted by Joseph Myers. Significant progress was made on many math
662 library bugs resulting in more accurate exceptions and function results.
663 Many thanks to all those that contributed including Andreas Jaeger for his
664 patch review and work on the x87 trigonometric instruction issues.
666 * Timezone data is no longer installed. Timezone-related binaries and scripts
667 will continue to be installed. Users should obtain their timezone data from
668 their distribution provider or from the tzdata package at
669 <ftp://munnari.oz.au/pub/>.
673 * The following bugs are resolved with this release:
675 6779, 6783, 9696, 10103, 10709, 11589, 11929, 12403, 12786, 12840, 12847,
676 12868, 12852, 12874, 12885, 12892, 12906, 12907, 12922, 12935, 12962,
677 13007, 13021, 13061, 13062, 13067, 13068, 13085, 13088, 13090, 13092,
678 13096, 13114, 13118, 13123, 13134, 13138, 13147, 13150, 13166, 13179,
679 13185, 13189, 13192, 13268, 13276, 13282, 13291, 13305, 13328, 13335,
680 13337, 13344, 13358, 13367, 13413, 13416, 13423, 13439, 13446, 13472,
681 13484, 13506, 13515, 13523, 13524, 13538, 13540
683 * New program pldd to list loaded object of a process
684 Implemented by Ulrich Drepper.
686 * Add nss_db support back to glibc. No more dependency on Berkeley db
687 and support for initgroups lookups.
688 Implemented by Ulrich Drepper.
690 * Optimized strcpy, strncpy, stpcpy, stpncpy for SSE2 and SSSE3 on x86-32.
691 Contributed by HJ Lu.
693 * Improved strcpy, strncpy, stpcpy, stpncpy for SSE2 and SSSE3 on x86-64.
694 Contributed by HJ Lu.
696 * Optimized strcat, strncat on x86-64 and optimized wcscmp, wcslen, strnlen
697 on x86-32 and x86-64.
698 Contributed by Liubov Dmitrieva.
700 * Optimized strchr and strrchr for SSE on x86-32.
701 Contributed by Liubov Dmitrieva.
703 * Optimized memchr, memrchr, rawmemchr, memcmp, wmemcmp, wcschr, wcscpy
704 for x86-64 and x86-32.
705 Contributed by Liubov Dmitrieva.
707 * New interfaces: scandirat, scandirat64
708 Implemented by Ulrich Drepper.
710 * Checking versions of FD_SET, FD_CLR, and FD_ISSET added.
711 Implemented by Ulrich Drepper.
713 * nscd now also caches the netgroup database.
714 Implemented by Ulrich Drepper.
716 * Integrate libm with gcc's -ffinite-math-only option.
717 Implemented by Ulrich Drepper.
719 * Lots of generic, 64-bit, and x86-64-specific performance optimizations
720 to math functions. Implemented by Ulrich Drepper.
722 * Optimized strcasecmp and strncasecmp for AVX on x86-64.
723 Implemented by Ulrich Drepper.
725 * New Linux interfaces: process_vm_readv, process_vm_writev
727 * Optimized strcasecmp and strncasecmp for SSSE3 and SSE4.2 on x86-32.
728 Implemented by Ulrich Drepper.
730 * Optimized nearbyint and strcasecmp for PPC.
731 Implemented by Adhemerval Zanella.
733 * New locales: bho_IN, unm_US, es_CU, ta_LK
737 * The following bugs are resolved with this release:
739 386, 6420, 7101, 9730, 9732, 9809, 10138, 10149, 10157, 11099, 11257,
740 11258, 11487, 11532, 11558, 11578, 11634, 11653, 11668, 11697, 11724,
741 11781, 11799, 11820, 11837, 11857, 11869, 11892, 11895, 11901, 11945,
742 11947, 11952, 11987, 12052, 12083, 12158, 12178, 12200, 12346, 12350,
743 12393, 12420, 12432, 12445, 12449, 12453, 12454, 12460, 12469, 12489,
744 12509, 12510, 12511, 12518, 12527, 12541, 12545, 12551, 12582, 12583,
745 12587, 12597, 12601, 12611, 12625, 12626, 12631, 12650, 12653, 12655,
746 12660, 12671, 12681, 12684, 12685, 12711, 12713, 12714, 12717, 12723,
747 12724, 12734, 12738, 12746, 12766, 12775, 12777, 12782, 12788, 12792,
748 12795, 12811, 12813, 12814, 12841
750 * The RPC implementation in libc is obsoleted. Old programs keep working
751 but new programs cannot be linked with the routines in libc anymore.
752 Programs in need of RPC functionality must be linked against TI-RPC.
753 The TI-RPC implementation is IPv6 enabled and there are other benefits.
755 Visible changes of this change include (obviously) the inability to link
756 programs using RPC functions without referencing the TI-RPC library and the
757 removal of the RPC headers from the glibc headers.
758 Implemented by Ulrich Drepper.
760 * New Linux interfaces: clock_adjtime, name_to_handle_at, open_by_handle_at,
761 syncfs, setns, sendmmsg
763 * New locales: os_RU, bem_ZA, en_ZA, ff_SN, sw_KE, sw_TZ, lb_LU, wae_CH,
764 yue_HK, lij_IT, mhr_RU
766 * New encodings: CP770, CP771, CP772, CP773, CP774
768 * New program sotruss to trace calls through PLTs
769 Implemented by Ulrich Drepper.
771 * The malloc hook implementation is marked deprecated and will be removed
772 from the default implementation in the next version. The design never
773 worked ever since the introduction of threads. Even programs which do
774 not create threads themselves can use multiple threads created internally.
778 * The following bugs are resolved with this release:
780 3268, 6812, 7066, 10085, 10484, 10563, 10851, 11149, 11155, 11577, 11611,
781 11640, 11655, 11701, 11840, 11856, 11883, 11903, 11904, 11968, 11979,
782 12005, 12037, 12067, 12077, 12078, 12092, 12093, 12107, 12108, 12113,
783 12140, 12159, 12167, 12191, 12194, 12201, 12204, 12205, 12207, 12348,
786 * New Linux interfaces: prlimit, prlimit64, fanotify_init, fanotify_mark
788 * POWER7 optimizations: memset, memcmp, strncmp
790 * New optimized string functions for x86-64: strnlen (SSE2),
791 strcasecmp (SSE2, SSSE3, SSE4.2), strncasecmp (SSE2, SSSE3, SSE4.2)
792 Implemented by Ulrich Drepper.
796 * The following bugs are resolved with this release:
798 3662, 4457, 5553, 10162, 10401, 10414, 10554, 10824, 10864, 10915,
799 10918, 10936, 10939, 10958, 10968, 10969, 10972, 10992, 11000, 11001,
800 11007, 11010, 11027, 11039, 11040, 11041, 11043, 11046, 11056, 11070,
801 11093, 11115, 11125, 11126, 11127, 11134, 11141, 11149, 11183, 11184,
802 11185, 11186, 11187, 11188, 11189, 11190, 11191, 11192, 11193, 11194,
803 11200, 11230, 11235, 11242, 11254, 11258, 11271, 11272, 11276, 11279,
804 11287, 11292, 11319, 11332, 11333, 11387, 11389, 11390, 11394, 11397,
805 11410, 11438, 11449, 11470, 11471, 11520, 11537, 11538, 11571
807 * New interfaces: pthread_getname_np, pthread_setname_np
809 * New Linux interface: recvmmsg
811 * STT_GNU_IFUNC implemented for Sparc by David Miller.
813 * The dynamic linker now recognizes supported ABI versions from the
814 EI_ABIVERSION field in the ELF header.
815 Implemented by Ulrich Drepper.
817 * New NIS mode selector ADJUNCT_AS_SHADOW. The passwd.adjunct.byname table
818 will not be used to fill in password fields in the passwd.byname replies.
819 Instead it is used to synthesize the shadow.byname table, should it be
820 missing. This is a useful mode in some installations involving Solaris.
821 Implemented by Ulrich Drepper.
823 * New locales: kok_IN, sq_MK, cv_RU
827 * The following bugs are resolved with this release:
829 3270, 7094, 9924, 9986, 10011, 10085, 10107, 10159, 10162, 10166, 10183,
830 10195, 10196, 10200, 10203, 10207, 10211, 10213, 10217, 10221, 10229,
831 10262, 10286, 10312, 10315, 10319, 10349, 10360, 10391, 10402, 10416,
832 10418, 10422, 10425, 10446, 10448, 10452, 10540, 10553, 10560, 10564,
833 10609, 10643, 10692, 10713, 10717, 10730, 10731, 10742, 10780, 10784,
834 10789, 10817, 10823, 10840, 10847
836 * New interfaces: execvpe, pthread_sigqueue, mkstemps, mkstemps64, mkostemps,
838 Implemented by Ulrich Drepper.
840 * Checking version of longjmp added that fails if an uninitialized stack
841 frame would be created. Implemented by Ulrich Drepper.
843 * STT_GNU_IFUNC is now supported in static executables.
844 Implemented by H.J. Lu.
846 * STT_GNU_IFUNC implemented for PPC by Alan Modra.
848 * New optimized string functions for x86-64: strstr, strcasestr, memcmp,
849 strcspn, strpbrk, strspn, strcpy, stpcpy, strncpy, strcmp (SSE2, SSE4.2),
850 strncmp (SSE2, SSE4.2), strchr (SSE4.2), strrchr (SSE4.2).
851 Contributed by H.J. Lu.
853 strlen, rawmemchr, strcmp (SSSE3), strncmp (SSSE3).
854 Implemented by Ulrich Drepper.
856 * New optimized string functions for x86: strlen, strcspn, strspn, strpbrk,
858 Contributed by H.J. Lu.
860 * Support for fma instruction in AVX on x86-64.
861 Implemented by H.J. Lu and Ulrich Drepper.
863 * AVX support in x86-64 auditing support in ld.so.
864 Implemented by H.J. Lu.
866 * STB_GNU_UNIQUE support added.
867 Implemented by Ulrich Drepper.
869 * Implement second fallback mode for optimized DNS lookup for even more
870 broken environments. If two requests from the same port are not
871 handled correctly close the socket and open a new one before sending
872 the second request. The 'single-request-reopen' option in /etc/resolv.conf
873 can be used to select this mode right away, instead of rediscovering the
874 necessity is every process again.
875 Implemented by Ulrich Drepper.
877 * New resolver flag RES_USE_DNSSEC to enable use of verified lookup.
878 Implemented by Adam Tkac.
880 * Optimized iconv conversions for S390x.
881 Implemented by Andreas Krebbel.
883 * Using condvars with PI mutexes is now more efficient due to kernel
884 support for requeueing to PI futexes. NPTL support added for x86-64.
885 Implemented by Ulrich Drepper.
887 * New locales: ps_AF, my_MM
891 * The following bugs are resolved with this release:
893 697, 5381, 5807, 6411, 6545, 7040, 7058, 7067, 7080, 7083, 7095, 7098,
894 9677, 9694, 9697, 9701, 9704, 9705, 9706, 9720, 9726, 9730, 9733, 9736,
895 9741, 9750, 9753, 9759, 9781, 9791, 9793, 9823, 9833, 9844, 9880, 9881,
896 9891, 9893, 9895, 9913, 9916, 9920, 9948, 9955, 9957, 9963, 9985, 10052,
897 10069, 10086, 10087, 10090, 10092, 10093, 10100, 10118, 10128
899 * New interfaces: preadv, preadv64, pwritev, pwritev64, malloc_info
900 Implemented by Ulrich Drepper.
902 * New Linux interfaces: accept4, fallocate, fallocate64.
903 Implemented by Ulrich Drepper.
905 * Correct declarations of string function when used in C++ code. This
906 could lead to compile errors for invalid C++ code.
908 * XPG7/POSIX 2008 compilation environment. Many GNU-specific functions are
911 * New POSIX 2008 interface: psiginfo
912 Implemented by Ulrich Drepper.
914 * New ISO C++1x interfaces: quick_exit, at_quick_exit
915 Implemented by Ulrich Drepper.
917 * Support for selecting between multiple function definitions at runtime
918 using STT_GNU_IFUNC symbols. Implemented by Ulrich Drepper.
920 * The libcrypt library can now use the hash function implementations in
921 NSS. Implemented by Ulrich Drepper.
923 * The malloc implementation can be compiled to be less memory efficient
924 but higher performing in multi-threaded programs.
925 Implemented by Ulrich Drepper.
927 * New locales: nan_TW@latin, ks_IN
929 * Faster strlen, strchr, strchrnul, strrchr, memchr, and rawmemchr for x86-64.
930 Implemented by Ulrich Drepper.
932 * Extended printf hook support. It is possible to use user-defined types
933 and extend existing format specifiers.
934 Implemented by Ulrich Drepper.
936 * Handling for group shadow files has been added.
937 Implemented by Ulrich Drepper.
939 * DNS IPv4-IPv6 parallel lookup now deals better with broken DNS
940 servers (the case, e.g., for some people using the built-in DNS
941 server in ADSL modems/routers). There is a once-per-process timeout
942 in case of a broken server. To avoid it, users can run nscd or put
943 'options single-request' in /etc/resolv.conf.
944 Implemented by Ulrich Drepper.
948 * The following bugs are resolved with this release:
950 3406, 5209, 5210, 5381, 5794, 5814, 5911, 6428, 6438, 6442, 6447, 6461,
951 6472, 6505, 6544, 6589, 6612, 6634, 6653, 6654, 6657, 6698, 6712, 6713,
952 6719, 6723, 6724, 6740, 6763, 6771, 6790, 6791, 6817, 6824, 6839, 6843,
953 6845, 6856, 6857, 6860, 6867, 6875, 6919, 6920, 6942, 6947, 6955, 6966,
954 6968, 6974, 6980, 6995, 7008, 7009, 7029
956 * Unified lookup for getaddrinfo: IPv4 and IPv6 addresses are now looked
957 up at the same time. Implemented by Ulrich Drepper.
959 * TLS descriptors for LD and GD on x86 and x86-64.
960 Implemented by Alexandre Oliva.
962 * getaddrinfo now handles DCCP and UDPlite.
963 Implemented by Ulrich Drepper.
965 * New fixed-size conversion macros: htobe16, htole16, be16toh, le16toh,
966 htobe32, htole32, be32toh, le32toh, htobe64, htole64, be64toh, le64toh.
967 Implemented by Ulrich Drepper.
969 * New implementation of memmem, strstr, and strcasestr which is O(n).
970 Implemented by Eric Blake.
972 * New Linux interfaces: inotify_init1, dup3, epoll_create1, pipe2
974 * Implement "e" option for popen to open file descriptor with the
975 close-on-exec flag set. Implemented by Ulrich Drepper.
977 * Implement "b" mode for fmemopen. In this mode writes writes don't
978 implicitly add a NUL byte and seeks from the end of the buffer really
979 use the buffer end, not the string length as the basis.
980 Implemented by Ulrich Drepper.
982 * Many functions, exported and internal, now atomically set the close-on-exec
983 flag when run on a sufficiently new kernel. Implemented by Ulrich Drepper.
985 * Sorting rules for some Indian languages (Kannada, Gurumukhi, Telugu,
987 Implemented by Pravin Satpute.
989 * New locales: sd_IN, sd_IN@devanagari, ks_IN@devanagari, ht_HT, en_AG, nl_AW.
993 * The following bugs are resolved with this release:
995 2549, 3112, 4314, 4407, 4997, 5012, 5040, 5112, 5204, 5208, 5209, 5220,
996 5222, 5224, 5225, 5237, 5238, 5240, 5245, 5277, 5346, 5375, 5378, 5382,
997 5424, 5427, 5428, 5435, 5436, 5439, 5441, 5442, 5443, 5451, 5452, 5454,
998 5455, 5463, 5464, 5465, 5475, 5477, 5478, 5520, 5541, 5545, 5553, 5600,
999 5602, 5607, 5614, 5627, 5628, 5736, 5737, 5741, 5753, 5760, 5762, 5768,
1000 5774, 5777, 5778, 5779, 5786, 5790, 5818, 5854, 5857, 5903, 5939, 5979,
1001 5983, 5995, 5998, 6004, 6007, 6020, 6021, 6024, 6040, 6042
1003 * New locales: bo_CN, bo_IN, shs_CA.
1005 * New encoding: HP-ROMAN9, HP-GREEK8, HP-THAI8, HP-TURKISH8.
1007 * Sorting rules for some Indian languages (Devanagari and Gujarati).
1008 Implemented by Pravin Satpute.
1010 * IPV6 addresses in /etc/resolv.conf can now have a scope ID
1012 * nscd caches now all timeouts for DNS entries
1013 Implemented by Ulrich Drepper.
1015 * nscd is more efficient and wakes up less often.
1016 Implemented by Ulrich Drepper.
1018 * More checking functions: asprintf, dprintf, obstack_printf, vasprintf,
1019 vdprintf, and obstack_vprintf.
1020 Implemented by Jakub Jelinek.
1022 * Faster memset for x86-64.
1023 Implemented by Harsha Jagasia and H.J. Lu.
1025 * Faster memcpy on x86.
1026 Implemented by Ulrich Drepper.
1028 * ARG_MAX is not anymore constant on Linux. Use sysconf(_SC_ARG_MAX).
1029 Implemented by Ulrich Drepper.
1031 * Faster sqrt and sqrtf implemention for some PPC variants.
1032 Implemented by Steven Munroe.
1036 * The following bugs are resolved with this release:
1038 4125, 4126, 4178, 4359, 4407, 4512, 4514, 4525, 4554, 4556, 4557, 4566,
1039 4582, 4586, 4588, 4599, 4610, 4647, 4702, 4705, 4726, 4745, 4772, 4773,
1040 4775, 4776, 4792, 4813, 4814, 4816, 4833, 4858, 4860, 4896, 4905, 4925,
1041 4936, 4937, 4938, 4941, 4946, 4963, 4972, 5010, 5028, 5043, 5058, 5063,
1042 5071, 5103, 5104, 5112, 5113, 5184, 5186
1044 * More checking functions: fread, fread_unlocked, open*, mq_open.
1045 Implemented by Jakub Jelinek and Ulrich Drepper.
1047 * Extend fortification to C++. Implemented by Jakub Jelinek.
1049 * Implement 'm' modifier for scanf. Add stricter C99/SUS compliance
1050 by not recognizing 'a' as a modifier when those specs are requested.
1051 Implemented by Jakub Jelinek.
1053 * PPC optimizations to math and string functions.
1054 Implemented by Steven Munroe.
1056 * New interfaces: mkostemp, mkostemp64. Like mkstemp* but allow additional
1057 options to be passed. Implemented by Ulrich Drepper.
1059 * More CPU set manipulation functions. Implemented by Ulrich Drepper.
1061 * New Linux interfaces: signalfd, eventfd, eventfd_read, and eventfd_write.
1062 Implemented by Ulrich Drepper.
1064 * Handle private futexes in the NPTL implementation.
1065 Implemented by Jakub Jelinek and Ulrich Drepper.
1067 * Add support for O_CLOEXEC. Implement in Hurd. Use throughout libc.
1068 Implemented by Roland McGrath and Ulrich Drepper.
1070 * Linux/x86-64 vDSO support. Implemented by Ulrich Drepper.
1072 * SHA-256 and SHA-512 based password encryption.
1073 Implemented by Ulrich Drepper.
1075 * New locales: ber_DZ, ber_MA, en_NG, fil_PH, fur_IT, fy_DE, ha_NG, ig_NG,
1076 ik_CA, iu_CA, li_BE, li_NL, nds_DE, nds_NL, pap_AN, sc_IT, tk_TM, ug_CN,
1079 + New iconv modules: MAC-CENTRALEUROPE, ISO-8859-9E, KOI8-RU.
1080 Implemented by Ulrich Drepper.
1084 * The following bugs are resolved with this release:
1086 3156, 3213, 3285, 3291, 3306, 3313, 3320, 3322, 3325, 3326, 3334, 3348,
1087 3352, 3363, 3369, 3426, 3427, 3429, 3451, 3458, 3465, 3480, 3483, 3493,
1088 3514, 3515, 3559, 3632, 3664, 3673, 3674, 3745, 3747, 3818, 3840, 3842,
1089 3851, 3855, 3884, 3885, 3902, 3905, 3919, 3944, 3954, 3955, 3957, 3991,
1090 3995, 3996, 4024, 4040, 4069, 4070, 4074, 4076, 4096, 4101, 4102, 4114,
1091 4130, 4131, 4181, 4276, 4306, 4342, 4344, 4349, 4364, 4368, 4381, 4392,
1092 4403, 4405, 4406, 4411, 4438, 4439, 4455, 4456, 4465, 4512, 4514, 4586,
1095 * New Linux interfaces: epoll_pwait, sched_getcpu.
1097 * New generic interfaces: strerror_l.
1099 * nscd can now cache the services database. Implemented by Ulrich Drepper.
1103 * The following bugs are resolved with this release:
1105 39, 68, 192, 352, 388, 531, 935, 1006, 1201, 1203, 1386, 1782, 1783, 1784,
1106 1785, 1786, 1787, 1951, 1974, 1996, 2072, 2098, 2125, 2134, 2158, 2182,
1107 2349, 2376, 2386, 2389, 2415, 2418, 2420, 2423, 2450, 2451, 2466, 2472,
1108 2473, 2477, 2498, 2499, 2501, 2502, 2505, 2507, 2508, 2509, 2517, 2526,
1109 2569, 2571, 2592, 2611, 2625, 2632, 2644, 2662, 2680, 2683, 2684, 2693,
1110 2695, 2703, 2734, 2751, 2764, 2766, 2775, 2792, 2821, 2823, 2832, 2841,
1111 2843, 2883, 2892, 2908, 2914, 2926, 2961, 2978, 2980, 2987, 2997, 2998,
1112 3013, 3018, 3034, 3040, 3044, 3123, 3124, 3137, 3138, 3143, 3155, 3189,
1113 3225, 3251, 3252, 3253, 3273
1115 * For Linux, the sorting of addresses returned by getaddrinfo now also
1116 handles rules 3, 4, and 7 from RFC 3484. I.e., all rules are handled.
1117 Implemented by Ulrich Drepper.
1119 * Allow system admin to configure getaddrinfo with the /etc/gai.conf file.
1120 Implemented by Ulrich Drepper.
1122 * New Linux interfaces: splice, tee, sync_file_range, vmsplice.
1124 * New iconv module for MIK. Contributed by Alexander Shopov.
1126 * For sites with broken group and/or passwd database, the auto-propagate
1127 option of nscd can prevent creating ID lookup entries from the results
1128 of a name lookup and vice versa. This usually is no problem but some
1129 site might have problems with the default behavior.
1130 Implemented by Ulrich Drepper.
1132 * Iterating over entire database in NIS can be slow. With the
1133 SETENT_BATCH_READ option in /etc/default/nss a system admin can decide
1134 to trade time for memory. The entire database will be read at once.
1135 Implemented by Ulrich Drepper.
1137 * The interfaces introduced in RFC 3542 have been implemented by
1140 * Support for the new ELF hash table format was added by Ulrich Drepper.
1142 * Support for priority inheritance mutexes added by Jakub Jelinek and
1145 * Support for priority protected mutexes added by Jakub Jelinek.
1147 * New locales: nr_ZA, pa_PK, ca_AD, ca_FR, ca_IT, el_CY, tr_CY, as_IN,
1148 or_IN, csb_PL, fy_NL, sr_ME.
1152 * More overflow detection functions.
1154 * New iconv converters for IBM1025, IBM1122, IBM1137, IBM1153,
1155 IBM1154, IBM1155, IBM1156, IBM1157, and IBM1158 contributed by Jiro Sekiba.
1157 More converters for IBM803, IBM901, IBM902, IBM921, IBM1008, IBM1097,
1158 IBM1112, IBM1123, IBM1130, IBM1140, IBM1141, IBM1142, IBM1143, IBM1144,
1159 IBM1145, IBM1146, IBM1147, IBM1148, IBM1149, IBM1166, IBM1167, IBM4517,
1160 IBM4899, IBM4909, IBM4971, IBM5347, IBM9030, IBM9066, IBM9448, IBM12712,
1161 IBM16804, IBM1364, IBM1371, IBM1388, IBM1390, and IBM1399 contributed
1162 by Masahide Washizawa.
1164 * It is now possible to install audit libraries for the dynamic linker using
1165 LD_AUDIT. Implemented by Ulrich Drepper.
1167 * The LinuxThreads add-on, providing pthreads on Linux 2.4 kernels, is no
1168 longer supported. The new NPTL implementation requires Linux 2.6 kernels.
1169 For a libc and libpthread that works well on Linux 2.4 kernels, we
1170 recommend using the stable 2.3 branch.
1172 * The new function open_wmemstream acts like open_memstream,
1173 but uses a wchar_t wide character buffer.
1175 * The new function ppoll is an improved version of poll, similar to pselect.
1177 * New interfaces: fdopendir, openat, fstatat, fchmodat, fchownat,
1178 futimesat, faccessat, mkdirat, mkfifoat, mknodat,
1179 renameat, unlinkat, linkat, symlinkat, readlinkat.
1181 * New Linux kernel system calls: unshare,
1182 inotify_init, inotify_add_watch, inotify_rm_watch.
1184 * The euidaccess function is now also known by the alias eaccess,
1185 for compatibility with some other systems.
1187 * Timezone data updated to 2006b version.
1191 * The following bugs are resolved with this release:
1193 38, 253, 549, 622, 653, 721, 758, 851, 877, 915, 934, 955, 961,
1194 1016, 1037, 1076, 1079, 1080, 1081, 1082, 1083, 1084, 1085, 1086,
1195 1087, 1088, 1090, 1091, 1092, 1093, 1094, 1095, 1096, 1097, 1098,
1196 1099, 1100, 1101, 1102, 1103, 1104, 1105, 1106, 1107, 1108, 1109,
1197 1110, 1111, 1112, 1113, 1125, 1137, 1138, 1249, 1250, 1251, 1252,
1198 1253, 1254, 1350, 1358, 1394, 1438, 1498, 1534
1200 Visit <http://sources.redhat.com/bugzilla/> for the details of each bug.
1202 * As of this release, GCC 4 can be used to compile the C Library.
1204 * Timezone data updated to 2005m version.
1208 * The following bugs are resolved with this release:
1210 284, 592, 602, 626, 633, 640, 650, 661, 671, 681, 693, 700, 710, 719,
1211 722, 723, 725, 726, 727, 728, 729, 730, 731, 732, 733, 734, 735, 736,
1212 737, 738, 739, 740, 741, 742, 743, 744, 745, 765, 767, 768, 769, 776,
1213 777, 787, 821, 822, 823, 825
1215 Visit <http://sources.redhat.com/bugzilla/> for the details of each bug.
1219 * Support for RFC 3678. Real implementations exist only for Linux so far.
1220 Implemented by Ulrich Drepper.
1222 * nscd can now cache entries persistently. Expiring entries are reloaded.
1223 For speedups the cache can be shared in memory with client processes.
1224 Implemented by Ulrich Drepper.
1226 * nscd can now perform SELinux checks.
1227 Implemented by Matthew Rickard <mjricka@epoch.ncsc.mil>.
1229 * getaddrinfo queries are now cached. Canonical name lookup is performed
1231 Implemented by Ulrich Drepper.
1233 * The nothrow function attribute is used when headers are used by gcc when
1234 compiling C code. This can avoid significant amounts of exception
1237 * The malloc functions perform more error checking and are stricter when
1238 it comes to reacting on errors. The default action is to terminate
1239 the process after showing an error message. Implemented by Ulrich Drepper.
1241 * Reverse lookups of IPv6 addresses does not use bit string or .ip6.int
1242 lookups anymore unless explicitly requested. Implemented by Ulrich Drepper.
1244 * Namespaces in ld.so are implemented. DSOs can be loaded in separate
1245 namespaces using the new function dlmopen(). This feature is of course,
1246 like most other dynamic loading functionality, not available in statically
1247 linked applications. Implemented by Ulrich Drepper.
1249 * Low-overhead boundary checking variants of string and some stdio functions
1250 were added. These are to be used in conjunction with a gcc patch by
1251 Jakub Jelinek which adds calls to these functions if possible.
1252 Implemented by Jakub Jelinek and Ulrich Drepper.
1254 * Old code for several operating systems and machine architectures that
1255 have not been in working condition in a long time have been removed from
1256 the main source tree maintained by the GNU C Library's maintainers.
1257 These files are now reside in the separate `ports' source module
1258 that is usable as an add-on when building the library.
1262 * New functions `dladdr1' and `dlinfo' in <dlfcn.h> provide more ways to
1263 interrogate the dynamic linker, compatible with the Solaris interface.
1265 * ELF thread-local storage support (TLS) now works on PowerPC and PowerPC64;
1266 implemented by Paul Mackerras, Steven Munroe, and Roland McGrath.
1268 * getifaddrs now uses the netlink interface on Linux to get its information.
1269 Implemented by Thorsten Kukuk.
1271 * getaddrinfo now implements AI_V4MAPPED, AI_ALL, and AI_ADDRCONF.
1272 Implemented by Ulrich Drepper.
1274 * support for non-executable stacks on x86 has been added. Changes mostly
1277 * regex is now much faster for multibyte locales. Changes by Jakub Jelinek
1280 * getaddrinfo now performs destination address selection according to
1285 * Thread-safe interfaces for many functions that access locale data
1286 were added in version 2.3, but these features were omitted from NEWS.
1287 Many functions have variants with an `_l' suffix that take a `locale_t'
1288 object as a parameter rather than consulting the current locale.
1289 The new functions `newlocale', `duplocale', and `freelocale' in <locale.h>
1290 create and maintain `locale_t' objects. Additionally, the new function
1291 `uselocale' sets "the current locale" (as used by functions not so
1292 parameterized) set for an individual thread. These features were added
1293 in version 2.3, implemented by Ulrich Drepper and Roland McGrath.
1295 * The functions getresuid, getresgid, setresuid, and setresgid, which
1296 have long been available on Linux, are now declared in <unistd.h>
1297 and are now also available on the Hurd.
1299 * ELF thread-local storage support (TLS) now works on x86-64.
1301 * The new dynamic string token $LIB is expanded in shared library names.
1302 This normally expands to lib, but on some 64-bit platforms to lib64 instead.
1304 * Aldy Hernandez contributed complete software floating point support for
1305 PowerPC machines with no FPU.
1307 * fexecve is implemented on Linux.
1309 * The `btowc' function should work at least twice as fast due to
1310 specialized callbacks in the iconv modules. Implemented by Bruno Haible.
1312 * With approriate thread add-ons cancelable functions are now implemented
1313 in libc.so as well. No need to call the function in libpthread. This
1314 change allowed to finally disable the incorrect and expensive handling
1315 of weak definition in ld.so.
1317 * Yet more PLT entries in libc.so have been removed. We finally arrived
1318 at the bare minimum. Startup times improved appropriately.
1320 * Support for the new Linux/x86 system call interface was added. The
1321 AT_SYSINFO auxiliary vector entry is recognized and handled.
1325 * Masahide Washizawa contributed iconv modules for IBM1163 and IBM1164
1328 * iconv (the program and the interface) now accepts empty names (excluding
1329 options like //TRANSLIT) to mean "use charset of current locale".
1331 * localedef can now transliterate characters in strings which are not in
1332 the provided charmap. The information from the input locale is used.
1334 * Prelinking support was added for ELF targets. This requires additional
1335 tools and recent versions of the GNU binutils. Contributed by Jakub Jelinek.
1337 * Read-only stdio streams now use mmap to speed up operation by eliminating
1338 copying and buffer underflows. To use add 'm' to the mode string of
1339 the fopen/fdopen/freopen call. Implemented by Ulrich Drepper.
1341 * The malloc functions were completely rewritten by Wolfram Gloger based
1342 on Doug Lea's malloc-2.7.0.c.
1344 * Isamu Hasegawa contributed a completely new and POSIX-conformant
1345 implementation of regex.
1347 * Bruno Haible upgraded the iconv and locale implementation to support
1350 * Contents of the LC_* and LANG environment variables in the CEN style are
1351 not recognized anymore. It never was used. Change by Ulrich Drepper.
1353 * The runtime (ld.so, libc, libpthread for Linux) now can handle the ELF
1354 thread-local storage (TLS) ABI on some platforms.
1355 Changes by Ulrich Drepper. SH support by Kaz Kojima.
1357 * Bruno Haible contributed iconv converters for ISO-2022-JP-3, SHIFT JIS-X0213,
1358 EUC-JISX0213, and TSCII.
1360 * New header <ifaddrs.h> with functions `getifaddrs' and `freeifaddrs':
1361 BSD-compatible interface for getting all network interface addresses.
1362 Implementation for IPv4 by Roland McGrath.
1364 * Loading of locale data is faster due to the introduction of a locale
1365 archive. Implemented by Roland McGrath and Ulrich Drepper.
1367 * Startup times are significantly reduced by not using exported functions
1368 inside the library itself. Changes by Jakub Jelinek, Roland McGrath,
1371 * Steven Munroe contributed a port to PowerPC64/Linux.
1375 * The Hurd now uses the GNU libio implementation of stdio rather than the
1376 old GNU stdio implementation, and uses a new ABI (libc.so.0.3).
1378 * The Hurd on x86 now has the `ioperm' function and <sys/io.h> header file
1379 with the same behavior as the Linux system call of the same name.
1383 * Stephen Moshier implemented log2, log10, powl and cbrtl for the
1384 128-bit long double format.
1386 * Masahide Washizawa contributed iconv modules for IBM1132, IBM1133, IBM1160,
1387 IBM1161, and IBM1162 charsets.
1389 * Andreas Jaeger contributed a port to x86-64/Linux.
1391 * Peter Bruin contributed a port to PowerPC/Hurd.
1393 * libc functions using I/O streams now can handle wide-oriented streams
1396 * optimizations in the dynamic linker. Binaries created by recent binutils
1397 versions start up quicker due to reduced time spent on relocations.
1399 * Support for use of gcc3 added by Jakub Jelinek and HJ Lu.
1403 * Stephen Moshier implemented cosh, expm1, log1p, acos, sinh, tanh,
1404 asinh, atanh, j0 for the 128-bit long double format.
1406 * Bruno Haible updated all the code handling Unicode in some form to
1407 support Unicode 3.1.
1409 * Speed of regex for single-byte locales is back to previous levels.
1410 Patch by Isamu Hasegawa.
1412 * Alpha, SPARC, and IA-64 now also using floating stacks.
1414 * Startup time of internationalized applications greatly improved through
1415 iconv cache. Use iconvconfig to generate the cache file.
1416 Contributed by Ulrich Drepper.
1418 * The IA-64 specific part of ld.so was rewritten to eliminate some pretty
1419 severe performance problems. Patch by David Mosberger.
1421 * The Hurd port got a lot more functionality like AIO, various stdio
1422 extensions, etc. Mainly done by Roland McGrath.
1424 * mtrace can now lookup symbols in shared libraries.
1428 * Intel's IA-64 math library is largely integrated. It provides fast and
1429 accurate implementatations for most basic and standard math functions
1430 in float, double, and long double format.
1432 * Stephen Moshier implemented j0, j1, jn, y0, y1, yn, lgamma, erf, erfc,
1433 and asin for the 96-bit long double format and asin, log, tan for the
1434 128-bit long double format.
1436 * The beginning of a last-bit accurate math library by IBM Haifa were added.
1437 The basic double functions exist today. Contributed by Abraham Ziv
1438 <ziv@il.ibm.com>, Moshe Olshansky <olshansk@il.ibm.com>, Ealan Henis
1439 <ealan@il.ibm.com>, and Anna Reitman <reitman@il.ibm.com>.
1441 * An asynchronous name lookup library was added. The interface is designed
1442 after POSIX AIO. The proposal was circulated beforehand to get comments.
1443 No negative ones came in. Implemented by Ulrich Drepper.
1445 * Port to S390/64bit contributed by Martin Schwidefsky
1446 <schwidefsky@de.ibm.com>.
1448 * David Mosberger <davidm@hpl.hp.com> implemented the setcontext family
1449 of functions for Linux/IA-64.
1451 * The RPC code is now thread safe. Threads can now use the same service
1452 of different services at the same time. Patch by Eric Norum
1453 <eric.norum@usask.ca> with some help by Ulrich Drepper.
1455 * Martin Schwidefsky <schwidefsky@de.ibm.com> implemented the setcontext
1456 family of functions for Linux/S390.
1458 * Ulrich Drepper <drepper@redhat.com> implemented the setcontext family
1459 of functions for Linux/x86.
1461 * Port to Linux/CRIS contributed by Axis Communications.
1465 * Lots of headers were cleaned up. Using the tool in the conform/ subdir
1466 we can now check for namespace violations and missing declarations. The
1467 result is that almost all headers are now Unix-compliant (as defined in
1468 the upcoming XPG6). The negative side is that some programs might need
1469 corrections, too, if they depend on the incorrect form of the headers in
1470 previous versions which defined too many symbols and included too many
1473 * regex now handles multibyte character sets correctly.
1474 Contributed by Isamu Hasegawa <isamu@yamato.ibm.com>.
1476 * iconv (the program) does now conform to the upcoming XPG6 and handles
1477 charmaps. Instead of the charset names the path of charmaps can be
1478 provided and the conversion happens based on this data.
1479 Contributed by Ulrich Drepper.
1481 * The locale program now provides detailed information about the installed
1486 only lists the names of the supported locales
1490 provides details such as country, language, and codeset name.
1491 Contributed by Ulrich Drepper.
1495 * The gencat program now parses the input file according to the charset
1496 selected by the LC_CTYPE category. This is important for stateful
1497 character sets. To make generating catalogs easier there is a way
1498 to overwrite the charset selected by the locale: before the first
1499 message or $ quote line the catalog can contain a line like
1501 $ codeset=ISO-8859-2
1503 to select the charset (ISO-8859-2 in this case).
1505 Implemented by Shinya Hanataka and Ulrich Drepper.
1507 * New codeset conversion modules: IBM-922 (Estonia PC codeset),
1508 IBM-1124 (Ukraine PC codeset), IBM-1129 (Vietnamese PC codeset).
1509 Contributed by Masahide Washizawa <washi@jp.ibm.com>.
1511 * Optimized string functions for Alpha ev6 and ev67 by Richard Henderson
1512 <rth@redhat.com> and Rick Gorton <rick.gorton@alpha-processor.com>.
1514 * The LANGUAGE environment variable is now ignored unless the locale is
1515 changed from the default "C" locale.
1517 * The usual bug fixes.
1521 * Greg McGary added runtime support for bounds checking using gcc's
1522 new -fbounded-pointers option. ix86 target is complete. PowerPC
1525 * Thorsten Kukuk added secure mode support to nscd.
1527 * The Berkeley db libraries have been removed.
1529 Related, the nss_db module is now in a separate package since it
1530 obviously requires a database library being available.
1532 * Wide character I/O streams implemented by Ulrich Drepper.
1534 * Functions from the extended socket API added by Ulrich Drepper.
1536 * Functions feenableexcept and fedisableexcept to control the
1537 behaviour of individual exceptions have been added by Andreas Jaeger.
1539 * ldconfig program added by Andreas Jaeger and Jakub Jelinek.
1541 * The resolver code has been updated from bind 8.2.3-T5B which supports
1542 threads. The integration was done by Andreas Jaeger, Adam D. Bradley,
1545 This change could in some situations effect backward compatibility. Since
1546 now `_res' is a thread-local instead of a global variable, modifying it
1547 in one thread does not have any effect in other threads.
1549 The resolver library was also extended to allow IPv6 as the transport
1550 protocol for the requests. This work was done by Stig Venaas.
1552 * Compatibility code for K&R C compilers has been removed from the
1553 header files. A ISO C compiler is needed to use the library
1554 (conforming to either C89 or C99 standard).
1556 * Complete rewrite of the localedef program to support multibyte character
1557 sets. Implement handling of ISO 14651 and ISO 14652. Rewrite strcoll,
1558 strxfrm, wcscoll, and wcsxfrm functions. Make isw*() functions work.
1559 Implemented by Ulrich Drepper.
1561 Bruno Haible significantly improved the generation and use of the data
1562 structures for the wide character tables.
1564 * Plural handling in gettext implemented by Ulrich Drepper.
1566 * The utmp daemon has been removed.
1568 * The port to MIPS-Linux has been finished by Andreas Jaeger.
1570 * A port to Hitachi SH3 and SH4 has been contributed by Kazumoto Kojima
1573 * POSIX clocks and timers implemented by Kaz Kylheku and Ulrich Drepper.
1575 * POSIX barriers implemented by Kaz Kylheku.
1577 * POSIX spawn function family implemented by Ulrich Drepper.
1579 * POSIX spinlocks are now available.
1581 * Timed wait functions for mutex, rwlock, and semaphores are implemented.
1583 * the configure option --enable-kernel=X.Y.Z allows to strip out
1584 compatibility for kernel versions before X.Y.Z. This is currently only
1585 implemented for Linux.
1587 * the sockaddr_in6 structure changed. The IPv6 working group added a new
1588 field sin6_scope_id. This means that all programs using IPv6 should be
1589 recompiled. Don't expect binary compatibility with previous glibc
1592 * various conversion modules for IBM character sets contributed by
1595 * IA-64 port by Jes Sorensen and HJ Lu.
1609 * New ISO C 9x function _Exit, imaxabs, and imaxdiv are added.
1611 * New xdr functions are added; some rpc functions are now 64bit clean.
1613 * Fixed a number of bugs and memory leaks (especially in NIS+ code).
1615 * Fixed known incompatibilities with glibc 2.0.
1617 * New functions lock64, strchrnul, rawmemchr, getutmp and getutmpx.
1619 * Optimized a number of functions (especially the ELF dynamic loader).
1621 * Update timezone data files.
1623 * lots of charmaps corrections
1625 * some new locale definitions and charmaps
1630 * Richard Henderson corrected size of struct timeval on Linux/Alpha to
1631 conform to POSIX member type requirements. Symbol versions have been
1632 adjusted as needed within the library, and for direct use by applications,
1633 but there is potential for problems if third-party libraries use
1634 struct timeval as part of their interface. This does not present
1635 a problem for X and other "essential" system libraries.
1637 * An additional locale model to support C++ Standard Library locale
1638 model and probably more was implemented by Ulrich Drepper.
1640 * Eric Youngdale and Ulrich Drepper implemented versioning of objects on
1643 * Miles Bader provided the `argp' function family to support hierachical
1644 command line argument parsing, layered on top of getopt.
1646 * strtod accepts new hexadecimal floating-point format from ISO C 9X.
1648 * printf has two new specifiers %a and %A to print hexadecimal flaoting-point
1651 * scanf recognizes the %a and %A format for scanning floating point numbers.
1653 * the new headers <stdint.h> and <inttypes.h> from ISO C 9X provides
1654 information and interfaces for the available integer types.
1656 * about 130 new math functions were added to implement the ISO C9x math
1659 * the new header <complex.h> contains definitions of the complex math
1660 functions from ISO C 9X.
1662 * the new header <tgmath.h> defines generic macros to use complex or
1663 real valued functions.
1665 * Thorsten Kukuk provided an implementation for NIS+, securelevel 0, 1 and 2.
1667 * Andreas Jaeger provided a test suite for the math library.
1669 * Mark Kettenis implemented the utmpx interface and an utmp daemon.
1671 * Ulrich Drepper added character set conversion functions (iconv).
1673 * Optimized string functions have been added.
1675 * The localedata addon is now part of glibc.
1677 * An implementation of profiling shared libraries was added by Ulrich Drepper.
1679 * Thorsten Kukuk and Ulrich Drepper provided an implementation for a caching
1680 daemon for NSS (nscd).
1682 Missing a better place here are some numbers on improvements. Under
1683 Linux 2.1.125 un-tar-ing the kernel sources takes
1687 using local files 12.19s 6.88s 22.91s
1689 using NIS 13.92s 8.91s 26.34s
1691 using NIS & nscd 10.37s 7.34s 25.30s
1693 using NIS+ 27.57s 30.37s 640.46s
1695 using NIS+ & nscd 10.25s 7.83s 26.51s
1697 using NIS & old nscd [1] 13.83s 8.32s 29.60s
1699 Keep in mind that non-namelookup related operations dominate above times.
1700 It was just a common complain that using NIS+ unpacking the kernel is
1703 [1] The old nscd implementation is not available anymore since it was
1704 distributed with glibc up to version 2.0.98 and thus is now replaced.
1706 * Tim Waugh provided an implementation of the POSIX.2 wordexp function family.
1708 * Mark Kettenis provided a Hesiod NSS module.
1710 * The ELF dynamic loader knows how to process dynamic string tokens ($ORIGIN
1711 and $PLATFORM) in RPATHs and similar strings (Ulrich Drepper).
1713 * rcmd can now handle netgroups (Dick Streefland).
1715 * A port to the ARM was contributed by Phil Blundell, Pat Beirne and Scott
1718 * Support for the IPv6 protocol has been added to the socket API, as per the
1719 latest draft standards.
1721 * Support for Linux 2.2 has been added.
1723 * Interface changes relative to the latest 2.0.x release:
1724 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
1725 addseverity NEW: Unix98
1726 alphasort64 NEW: LFS
1727 argp_err_exit_status NEW: argp, GNU ext
1728 argp_error NEW: argp, GNU ext
1729 argp_failure NEW: argp, GNU ext
1730 argp_help NEW: argp, GNU ext
1731 argp_parse NEW: argp, GNU ext
1732 argp_program_bug_address NEW: argp, GNU ext
1733 argp_program_version NEW: argp, GNU ext
1734 argp_program_version_hook NEW: argp, GNU ext
1735 argp_state_help NEW: argp, GNU ext
1736 argp_usage NEW: argp, GNU ext
1737 authdes_create NEW: Secure RPC
1738 authdes_getucred NEW: Secure RPC
1739 authdes_pk_create NEW: Secure RPC
1740 backtrace NEW: GNU ext.
1741 backtrace_symbols NEW: GNU ext.
1742 backtrace_symbols_fd NEW: GNU ext.
1744 cacosf NEW: ISO C 9x
1745 cacosh NEW: ISO C 9x
1746 cacoshf NEW: ISO C 9x
1747 cacoshl NEW: ISO C 9x
1748 cacosl NEW: ISO C 9x
1755 casinf NEW: ISO C 9x
1756 casinh NEW: ISO C 9x
1757 casinhf NEW: ISO C 9x
1758 casinhl NEW: ISO C 9x
1759 casinl NEW: ISO C 9x
1761 catanf NEW: ISO C 9x
1762 catanh NEW: ISO C 9x
1763 catanhf NEW: ISO C 9x
1764 catanhl NEW: ISO C 9x
1765 catanl NEW: ISO C 9x
1766 cbc_crypt NEW: Secure RPC
1770 ccoshf NEW: ISO C 9x
1771 ccoshl NEW: ISO C 9x
1777 cimagf NEW: ISO C 9x
1778 cimagl NEW: ISO C 9x
1779 clearerr_locked REMOVED
1780 clntunix_create NEW: sunrpc ext
1782 clog10 NEW: ISO C 9x
1783 clog10f NEW: ISO C 9x
1784 clog10l NEW: ISO C 9x
1794 cprojf NEW: ISO C 9x
1795 cprojl NEW: ISO C 9x
1797 crealf NEW: ISO C 9x
1798 creall NEW: ISO C 9x
1803 csinhf NEW: ISO C 9x
1804 csinhl NEW: ISO C 9x
1807 csqrtf NEW: ISO C 9x
1808 csqrtl NEW: ISO C 9x
1812 ctanhf NEW: ISO C 9x
1813 ctanhl NEW: ISO C 9x
1815 des_setparity NEW: Secure RPC
1816 ecb_crypt NEW: Secure RPC
1817 endutxent NEW: Unix98
1819 exp10f NEW: ISO C 9x
1820 exp10l NEW: ISO C 9x
1824 fattach NEW: STREAMS
1825 fdetach NEW: STREAMS
1829 feclearexcept NEW: ISO C 9x
1830 fegetenv NEW: ISO C 9x
1831 fegetexceptflag NEW: ISO C 9x
1832 fegetround NEW: ISO C 9x
1833 feholdexcept NEW: ISO C 9x
1835 feraiseexcept NEW: ISO C 9x
1836 ferror_locked REMOVED
1837 fesetenv NEW: ISO C 9x
1838 fesetexceptflag NEW: ISO C 9x
1839 fesetround NEW: ISO C 9x
1840 fetestexcept NEW: ISO C 9x
1841 feupdateenv NEW: ISO C 9x
1842 fflush_locked REMOVED
1846 fgets_unlocked NEW: GNU ext.
1847 fileno_locked REMOVED
1859 fputc_locked REMOVED
1860 fputs_unlocked NEW: GNU ext.
1861 fread_unlocked NEW: GNU ext.
1866 fstatvfs NEW: Unix98
1870 ftruncate64 NEW: LFS
1872 fwrite_unlocked NEW: GNU ext.
1873 gai_strerror NEW: IPv6
1877 getchar_locked REMOVED
1879 getdate_err NEW: Unix98
1880 getdate_r NEW: GNU ext.
1882 getnameinfo NEW: IPv6
1883 getnetname NEW: Secure RPC
1884 getpmsg NEW: STREAMS
1885 getpt NEW: Unix98 PTY
1886 getrlimit64 NEW: LFS
1887 getutxent NEW: Unix98
1888 getutxid NEW: Unix98
1889 getutxline NEW: Unix98
1890 glob64 NEW: GNU ext.
1891 globfree64 NEW: GNU ext.
1892 gnu_get_libc_release NEW: GNU ext.
1893 gnu_get_libc_version NEW: GNU ext.
1894 grantpt NEW: Unix98 PTY
1895 host2netname NEW: Secure RPC
1897 iconv_close NEW: iconv
1898 iconv_open NEW: iconv
1899 if_freenameindex NEW: IPv6
1900 if_indextoname NEW: IPv6
1901 if_nameindex NEW: IPv6
1902 if_nametoindex NEW: IPv6
1903 in6addr_any NEW: IPv6
1904 in6addr_loopback NEW: IPv6
1905 inet6_isipv4mapped NEW: IPv6
1906 isastream NEW: STREAMS
1907 iswblank NEW: GNU ext.
1908 key_decryptsession NEW: Secure RPC
1909 key_decryptsession_pk NEW: Secure RPC
1910 key_encryptsession NEW: Secure RPC
1911 key_encryptsession_pk NEW: Secure RPC
1912 key_gendes NEW: Secure RPC
1913 key_get_conv NEW: Secure RPC
1914 key_secretkey_is_set NEW: Secure RPC
1915 key_setnet NEW: Secure RPC
1916 key_setsecret NEW: Secure RPC
1917 llrint NEW: ISO C 9x
1918 llrintf NEW: ISO C 9x
1919 llrintl NEW: ISO C 9x
1920 llround NEW: ISO C 9x
1921 llroundf NEW: ISO C 9x
1922 llroundl NEW: ISO C 9x
1927 lrintf NEW: ISO C 9x
1928 lrintl NEW: ISO C 9x
1929 lround NEW: ISO C 9x
1930 lroundf NEW: ISO C 9x
1931 lroundl NEW: ISO C 9x
1933 makecontext NEW: Unix98
1934 mempcpy NEW: GNU ext.
1937 modify_ldt NEW: kernel
1941 nearbyint NEW: ISO C 9x
1942 nearbyintf NEW: ISO C 9x
1943 nearbyintl NEW: ISO C 9x
1944 netname2host NEW: Secure RPC
1945 netname2user NEW: Secure RPC
1946 nexttoward NEW: ISO C 9x
1947 nexttowardf NEW: ISO C 9x
1948 nexttowardl NEW: ISO C 9x
1952 passwd2des NEW: Secure RPC
1954 pow10f NEW: GNU ext.
1955 pow10l NEW: GNU ext.
1958 printf_size NEW: GNU ext.
1959 printf_size_info NEW: GNU ext.
1960 profil_counter REMOVED
1961 pthread_mutexattr_getkind_np REPLACED
1962 pthread_mutexattr_setkind_np REPLACED
1963 ptsname NEW: Unix98 PTY
1964 ptsname_r NEW: Unix98 PTY
1966 putchar_locked REMOVED
1967 putgrent NEW: GNU ext.
1969 putpmsg NEW: STREAMS
1970 pututxline NEW: Unix98
1974 readdir64_r NEW: LFS
1975 remquo NEW: ISO C 9x
1976 remquof NEW: ISO C 9x
1977 remquol NEW: ISO C 9x
1979 roundf NEW: ISO C 9x
1980 roundl NEW: ISO C 9x
1982 scalbln NEW: ISO C 9x
1983 scalblnf NEW: ISO C 9x
1984 scalblnl NEW: ISO C 9x
1986 sendfile NEW: kernel
1987 setcontext NEW: Unix98
1988 setrlimit64 NEW: LFS
1989 setutxent NEW: Unix98
1991 sigignore NEW: Unix98
1992 sigqueue NEW: POSIX.1b
1993 sigrelse NEW: Unix98
1994 sigset NEW: POSIX.1b
1995 sigtimedwait NEW: POSIX.1b
1996 sigwaitinfo NEW: POSIX.1b
1997 sincos NEW: GNU ext.
1998 sincosf NEW: GNU ext.
1999 sincosl NEW: GNU ext.
2003 strcasestr NEW: GNU ext.
2004 strtoimax NEW: ISO C 9x
2005 strtoumax NEW: ISO C 9x
2006 strverscmp NEW: GNU ext.
2007 svcauthdes_stats NEW: Secure RPC
2008 svcunix_create NEW: sunrpc etx
2009 svcunixfd_create NEW: sunrpc ext
2010 swapcontext NEW: Unix98
2011 tcgetsid NEW: Unix98 PTY
2012 tdestroy NEW: GNU ext.
2013 tgamma NEW: ISO C 9x
2014 tgammaf NEW: ISO C 9x
2015 tgammal NEW: ISO C 9x
2019 truncf NEW: ISO C 9x
2020 truncl NEW: ISO C 9x
2022 unlockpt NEW: Unix98 PTY
2023 updwtmpx NEW: Unix98
2024 user2netname NEW: Secure RPC
2025 utmpxname NEW: Unix98
2026 versionsort NEW: GNU ext.
2027 versionsort64 NEW: GNU ext.
2029 wcscasecmp NEW: GNU ext.
2030 wcsncasecmp NEW: GNU ext.
2031 wcsnlen NEW: GNU ext.
2032 wcstoimax NEW: ISO C 9x
2033 wcstoll NEW: ISO C 9x
2034 wcstoull NEW: ISO C 9x
2035 wcstoumax NEW: ISO C 9x
2037 wordexp NEW: POSIX.2
2038 wordfree NEW: POSIX.2
2039 write_profiling REMOVED
2040 xdecrypt NEW: Secure RPC
2041 xdr_authdes_cred NEW: Secure RPC
2042 xdr_authdes_verf NEW: Secure RPC
2043 xdr_cryptkeyarg NEW: Secure RPC
2044 xdr_cryptkeyarg2 NEW: Secure RPC
2045 xdr_cryptkeyres NEW: Secure RPC
2046 xdr_getcredres NEW: Secure RPC
2047 xdr_key_netstarg NEW: Secure RPC
2048 xdr_key_netstres NEW: Secure RPC
2049 xdr_keybuf NEW: Secure RPC
2050 xdr_keystatus NEW: Secure RPC
2051 xdr_netnamestr NEW: Secure RPC
2052 xdr_sizeof NEW: Secure RPC
2053 xdr_unixcred NEW: sunrpc ext
2054 xencrypt NEW: Secure RPC
2055 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
2066 * inet_ntoa is thread-safe
2068 * updwtmp is moved from libutil to libc
2070 * rewrite of cbrt function
2072 * update of timezone data
2086 * add atoll function
2088 * fix complex problems in Berkeley DB code
2090 * fix math functions
2094 * fixed lots of header problems (especially Linux/GNU specific)
2096 * dynamic loader preserves all registers
2098 * Roland McGrath provided support for handling of auxiliary objects in
2099 the ELF dynamic loader.
2101 * support for parallel builds is improved
2105 * GNU extensions are no longer declared by default. To enable them you
2106 must define the macro `_GNU_SOURCE' in your program or compile with
2109 * The library has changed from using GNU ld symbol aliases to using weak
2110 symbols where available. The ELF object file format supports weak
2111 symbols; GNU ld also supports weak symbols in the a.out format. (There
2112 is also now support for other GNU ld extensions in ELF. Use the
2113 `--with-elf' option to configure to indicate you have ELF, and
2114 `--with-gnu-ld' if using GNU ld.) This change resulted in the deletion
2115 of many files which contained only symbol aliases, reducing the size of
2116 the source and the compiled library; many other files were renamed to
2117 less cryptic names previously occupied by the symbol alias files.
2118 There is a new header file <elf.h> for programs which operate on
2119 files in the ELF format.
2121 * Converted to Autoconf version 2, so `configure' has more options.
2122 Run `configure --help' to see the details.
2124 * The library can now be configured to build profiling, highly-optimized
2125 (but undebuggable), and/or shared libraries (ELF with GNU ld only). The
2126 `--enable-profile', `--enable-omitfp', and `--enable-shared' options to
2127 `configure' enable building these extra libraries. The shared library is
2128 built by default when using both ELF and GNU ld. When shared libraries
2129 are enabled, the new library `-ldl' is available for arbitrary run-time
2130 loading of shared objects; its interface is defined in <dlfcn.h>. The
2131 new header file <link.h> gives access to the internals of the run-time
2132 dynamic linker, `ld.so'. The shell script `ldd' is similar to the
2133 application of same name on other systems and it provides information
2134 about dynamically linked binaries.
2136 * The C library now provides the run-time support code for profiling
2137 executables compiled with `-pg'. Programs can control the profiling code
2138 through the interface in <sys/gmon.h>. The `gmon.out' files written by
2139 the GNU C library can be read only by GNU `gprof' (from GNU binutils);
2140 the support for this file format was contributed by David Mosberger-Tang.
2142 * The math code has been replaced with a math library based on fdlibm from
2143 Sun, and modified by JT Conklin and Ulrich Drepper with i387 support, by
2144 Ian Taylor with `float' functions and by Ulrich Drepper with `long double'
2145 functions. The math functions now reside in a separate library, so
2146 programs using them will need to use `-lm' their linking commands.
2148 * John C. Bowman contributed optimized ix87 assembler inline functions.
2150 * Ulrich Drepper has contributed support for an `/etc/nsswitch.conf'
2151 mechanism similar to that found in Solaris 2. This is now used for the
2152 group, passwd, hosts, networks, services, protocols, rpc, ethers,
2153 shadow, netgroup, publickey, and alias databases. The `nsswitch.conf'
2154 file controls what services are used for each individual database. This
2155 works by loading shared libraries with names specified in `nsswitch.conf',
2156 so service modules can be changed or added at any time without even
2157 relinking any program. Currently there are the file, db, and NIS based
2158 NSS services available.
2160 * The new functions `strtoq' and `strtouq' parse integer values from
2161 strings, like `strtol' and `strtoul', but they return `long long int' and
2162 `unsigned long long int' values, respectively (64-bit quantities).
2164 * The new functions `strtof' and `strtold' parse floating-point values from
2165 strings, like `strtod', but they return `float' and `long double' values,
2166 respectively (on some machines `double' and `long double' are the same).
2168 * Ulrich Drepper has contributed new implementations of the floating-point
2169 printing and reading code used in the `printf' family of functions and
2170 `strtod', `strtof', and `strtold'. These new functions are perfectly
2171 accurate, and much faster than the old ones.
2173 * The implementation of the POSIX locale model was completely rewritten by
2174 Ulrich Drepper. This includes the new programs `localedef' and `locale'
2175 to compile the POSIX locale definition.
2177 * The former dummy implementations of the strcoll and strxfrm function are
2178 now replaced by fully functional code contributed by Ulrich Drepper. The
2179 collation information comes from the POSIX locale definitions.
2181 * The new header <langinfo.h> defines an interface for accessing
2182 various locale-dependent data (using the locale chosen with `setlocale').
2184 * Ulrich Drepper has contributed a new suite of functions for operation on
2185 wide-character and multibyte-character strings, in <wchar.h>;
2186 and classification and case conversion of wide characters, in <wctype.h>.
2187 These new functions are conforming to the ISO C, Amendement 1 specification.
2189 * There is now a second implementation of the standard I/O library available.
2190 It comes from GNU libg++ as was written by Per Bothner, heavily modified
2191 by Hongjiu Lu and made thread safe by Ulrich Drepper.
2193 * You can now use positional parameter specifications in format strings
2194 for the `printf' and `scanf' families of functions. For example,
2195 `printf ("Number %2$d, Mr %1$s\n", "Jones", 6);'' prints
2196 ``Number 6, Mr Jones''. This is mainly useful when providing different
2197 format strings for different languages, whose grammars may dictate
2198 different orderings of the values being printed. To support this
2199 feature, the interface for `register_printf_handler' has changed; see
2200 the header file <printf.h> for details.
2202 * The `printf' and `scanf' families of functions now understand a new
2203 formatting flag for numeric conversions: the ' flag (e.g. %'d or %'f) says
2204 to group numbers as indicated by the locale; for `scanf' and friends, this
2205 says to accept as valid only a number with all the proper grouping
2206 separators in the right places. In the default "C" locale, numbers are
2207 not grouped; but locales for specific countries will define the usual
2208 conventions (i.e. separate thousands with `,' in the US locale).
2210 * The pgrp functions have been regularized, slightly incompatibly but much
2211 less confusingly. The core functions are now `getpgid' and `setpgid',
2212 which take arguments for the PID to operate on; the POSIX.1 `getpgrp' (no
2213 argument) and BSD `setpgrp' (identical to `setpgid') functions are
2214 provided for compatibility. There is no longer an incompatible `getpgrp'
2215 with an argument declared under _BSD_SOURCE; no BSD code uses it.
2217 * The new header file <fts.h> and suite of functions simplify programs that
2218 operate on directory trees. This code comes from 4.4 BSD.
2220 * The resolver code has been updated from the BIND 4.9.5-P1 release.
2221 Parts of the code were heavily modified by Ulrich Drepper to fit in the
2222 NSS scheme used in glibc.
2224 * There is a new malloc debugging hook `__memalign_hook'.
2226 * There are new typedefs `ushort' for `unsigned short int' and `uint' for
2227 `unsigned int' in <sys/types.h>. These are for compatibility only and
2228 their use is discouraged.
2230 * The `-lmcheck' library to enable standard malloc debugging hooks is now
2231 done differently, so that it works even without GNU ld.
2233 * New function `euidaccess' checks allowed access to a file like `access',
2234 but using the effective IDs instead of the real IDs.
2236 * The time zone data files have been updated for the latest and greatest
2237 local time conventions of the countries of the world.
2239 * The new function `dirfd' extracts the file descriptor used by a DIR stream;
2242 * The new functions `ecvt', `fcvt', and `gcvt' provide an obsolete interface
2243 for formatting floating-point numbers. They are provided only for
2244 compatibility; new programs should use `sprintf' instead. There are
2245 also equivalent function for the `long double' floating-point type and
2246 all functions also exist in a reentrant form.
2248 * The new auxiliary library `-lutil' from 4.4 BSD contains various
2249 functions for maintaining the login-record files (primarily of use to
2250 system programs such as `login'), and convenient functions for
2251 allocating and initializing a pseudo-terminal (pty) device.
2253 * Ulrich Drepper has contributed new support for System V style
2254 shared memory and IPC on systems that support it.
2256 * Ulrich Drepper has contributed several miscellaneous new functions found
2257 in System V: The `hsearch' family of functions provide an effective
2258 implementation of hash tables; `a64l' and `l64a' provide a very simple
2259 binary to ASCII mapping; `drand48' and friends provide a 48-bit random
2262 * Ulrich Drepper has contributed new reentrant counterparts for the
2263 `random' and `hsearch' families of functions; `random_r', `hsearch_r', etc.
2265 * Ulrich Drepper has contributed new, highly-optimized versions of several
2266 string functions for the i486/Pentium family of processors.
2268 * Ulrich Drepper has updated the Linux-specific code, based largely
2269 on work done in Hongjiu Lu's version of GNU libc for Linux.
2270 The GNU library now supports Linux versions 2.0.10 and later,
2271 using the ELF object file format (i[3456]86-*-linux).
2273 * Andreas Schwab has ported the C library to Linux/m68k (m68k-*-linux).
2275 * David Mosberger-Tang and Richard Henderson have ported the C library
2276 to Linux/Alpha (alpha-*-linux). Richard Henderson contributed the
2277 dynamic linking support for ELF/Alpha.
2279 * Richard Henderson contributed several Alpha optimized assembler function
2280 for arithmetic and string handling.
2282 * Ulrich Drepper has contributed a new set of message catalog functions to
2283 support multiple languages using the <libintl.h> interface, for use with
2284 his new package GNU gettext. Translation volunteers have contributed
2285 catalogs of the library's messages in Spanish, German, and Korean.
2287 * For compatibility with XPG4, Ulrich Drepper has contributed the `gencat'
2288 program and the `catgets' function for reading the catalog files it
2289 creates. (The <libintl.h> interface is preferred; we include the
2290 <nl_types.h> interface using `catgets' only for source compatibility with
2291 programs already written to use it.)
2293 * New header file <values.h> gives SVID-compatible names for <limits.h>
2296 * Various new macros, declarations, and small header files for compatibility
2299 * New function `group_member' is a convenient way to check if a process has
2300 a given effective group ID.
2302 * When using GCC 2.7 and later, the socket functions are now declared in a
2303 special way so that passing an argument of type `struct sockaddr_in *',
2304 `struct sockaddr_ns *', or `struct sockaddr_un *' instead of the generic
2305 `struct sockaddr *' type, does not generate a type-clash warning.
2307 * New function `error' declared in header file <error.h> is a convenient
2308 function for printing error messages and optionally exiting; this is the
2309 canonical function used in GNU programs. The new functions `err', `warn',
2310 and friends in header file <err.h> are the canonical 4.4 BSD interface for
2311 doing the same thing.
2313 * The <glob.h> interface has several new flags from 4.4 BSD that extend the
2314 POSIX.2 `glob' function to do ~ and {...} expansion.
2316 * New function `unsetenv' complements `setenv' for compatibility with 4.4 BSD.
2317 `clearenv' which is used in POSIX.9 is also available.
2319 * New function `getsid' returns session ID number on systems that support it.
2321 * We have incorporated the 4.4 BSD `db' library (version 1.85). New header
2322 files <db.h> and <mpool.h> provide a rich set of functions for several
2323 types of simple databases stored in memory and in files, and <ndbm.h> is
2324 an old `ndbm'-compatible interface using the `db' functions. Link with
2325 `-ldb' to get these functions.
2327 * New macro `strdupa' copies a string like `strdup', but uses local stack
2328 space from `alloca' instead of dynamic heap space from `malloc'.
2330 * New function `strnlen' is like `strlen' but searches only a given maximum
2331 number of characters for the null terminator. `stpncpy', `strndup' and
2332 `strndupa' are similar variants for the `stpcpy', `strdup' and `strdupa'
2335 * New function `statfs' in header <sys/statfs.h>.
2337 * The new <argz.h> and <envz.h> interfaces contributed by Miles Bader
2338 provide convenient functions for operating on blocks of null-terminated
2341 * A new suite of functions in <utmp.h> handle all the details of reading
2342 and writing the utmp file.
2344 * An implementation of the NIS/YP(tm) based NSS service was contributed by
2347 * Paul Eggert and Ulrich Drepper modified the `strftime' function to be
2348 completely POSIX compliant and also implemented the extended functionality
2349 to handle alternate digit representation and alternate era date formats.
2351 * Ulrich Drepper provided an implementation of the `strptime' function
2352 defined in XPG4.2 which transforms a string into a `struct tm' value.
2354 * Paul Eggert provided the tzselect shell script as part of the timezone
2355 code. The shell script makes it easy to select the correct timezone
2358 * The implementation of the malloc family of functions is completely replaced
2359 by a new implementation by Doug Lea with many improvements by Wolfram Gloger.
2360 The implementation uses the mmap function (if available) and it is
2361 optimized for the use in multi threaded programs.
2363 * Ulrich Drepper contributed a MD5 "encryption" for the crypt family of
2364 functions. This new functionality is usable by specifying a special
2365 salt string and it is compatible with implementation on *BSD systems.
2367 * Lots of functions from the XPG4.2 standard were added by Ulrich Drepper:
2368 `getsubopt' to handle second level command line options, `bsd_signal'
2369 to access BSD style `signal' functionality, the obsolete `regexp' style
2372 * the `lchown' function is available on system which support this
2375 * The implementation of the shadow password handling function was contributed
2378 * David Mosberger-Tang changed the SunRPC implementation to be 64bit safe.
2380 * POSIX.1g support was added. The <sys/select.h> header is available,
2381 `isfdtype' and `pselect' are implemented. Craig Metz contributed an
2382 implementation of `getaddrinfo'.
2386 * For cross-compilation you should now set `BUILD_CC' instead of `HOST_CC'.
2388 * New header file <fstab.h> and new functions `getfsspec', `getfsent' and
2389 friends, for parsing /etc/fstab. This code comes from 4.4 BSD.
2391 * The new function `daemon' from 4.4 BSD is useful for server programs that
2392 want to put themselves in the background.
2394 * Joel Sherrill has contributed support for several standalone boards that
2395 run without an operating system.
2397 * `printf', `scanf' and friends now accept a `q' type modifier for long
2398 long int as well as `ll'. Formats using these might be `%qu' or `%lld'.
2400 * All of the code taken from BSD (notably most of the math and networking
2401 routines) has been updated from the BSD 4.4-Lite release.
2403 * The resolver code has been updated from the BIND-4.9.3-BETA9 release.
2405 * The new functions `getdomainname' and `setdomainname' fetch or change the
2406 YP/NIS domain name. These are system calls which exist on systems which
2409 * The time zone data files have been updated for the latest international
2412 * The SunRPC programs `portmap' and `rpcinfo' are now installed in
2413 $(sbindir) (usually /usr/local/sbin) instead of $(bindir).
2417 * The C library now includes support for Sun RPC, from Sun's free
2418 RPCSRC-4.0 distribution. The `portmap', `rpcinfo', and `rpcgen' programs
2419 are included. (There is still no support for YP.)
2421 * Tom Quinn has contributed a port of the C library to SGI machines running
2422 Irix 4 (mips-sgi-irix4).
2424 * The new `lockf' function is a simplified interface to the locking
2425 facilities of `fcntl', included for compatibility.
2427 * New time functions `timegm', `timelocal', and `dysize' for compatibility.
2429 * New header file <sys/timeb.h> and new function `ftime' for compatibility.
2431 * New header files <poll.h> and <sys/poll.h> and new function `poll' for
2434 * The error message printed by `assert' for a failed assertion now includes
2435 the name of the program (if using GNU ld) and the name of the calling
2436 function (with versions of GCC that support this).
2438 * The `psignal' function is now declared in <signal.h>, not <stdio.h>.
2440 * The library now includes the <sys/mman.h> header file and memory
2441 management functions `mmap', `munmap', `mprotect', `msync', and
2442 `madvise', on systems that support those facilities.
2444 * The interface for `mcheck' has changed slightly: the function called to
2445 abort the program when an allocation inconsistency is detected now takes
2446 an argument that indicates the type of failure. The new function
2447 `mprobe' lets you request a consistency check for a particular block at
2448 any time (checks are normally done only when you call `free' or `realloc'
2451 * It is now possible to easily cross-compile the C library, building on one
2452 system a library to run on another machine and/or operating system. All
2453 you need to do is set the variable `HOST_CC' in `configparms' to the
2454 native compiler for programs to run on the machine you are building on (a
2455 few generator programs are used on Unix systems); set `CC' to the
2458 * The new function `fexecve' (only implemented on the GNU system) executes
2459 a program file given a file descriptor already open on the file.
2463 * Brendan Kehoe has contributed most of a port to the DEC Alpha
2464 running OSF/1 (alpha-dec-osf1). He says it is 75% complete.
2466 * You can set the variable `libprefix' in `configparms' to specify a prefix
2467 to be prepended to installed library files; this makes it easy to install
2468 the GNU C library to be linked as `-lgnuc' or whatever.
2470 * The new `stpncpy' is a cross between `stpcpy' and `strncpy': It
2471 copies a limited number of characters from a string, and returns the
2472 address of the last character written.
2474 * You no longer need to check for whether the installed `stddef.h' is
2475 compatible with the GNU C library. configure now checks for you.
2477 * You can now define a per-stream `fileno' function to convert the
2478 stream's cookie into an integral file descriptor.
2480 * ``malloc (0)'' no longer returns a null pointer. Instead, it
2481 allocates zero bytes of storage, and returns a unique pointer which
2482 you can pass to `realloc' or `free'. The behavior is undefined if
2483 you dereference this pointer.
2485 * The C library now runs on Sony NEWS m68k machines running either
2486 NewsOS 3 or NewsOS 4.
2488 * The new `syscall' function is a system-dependent primitive function
2489 for invoking system calls. It has the canonical behavior on Unix
2490 systems, including unreliable return values for some calls (such as
2491 `pipe', `fork' and `getppid').
2493 * The error code `EWOULDBLOCK' is now obsolete; it is always defined
2494 to `EAGAIN', which is the preferred name. On systems whose kernels
2495 use two distinct codes, the C library now translates EWOULDBLOCK to
2496 EAGAIN in every system call function.
2500 * The GNU C Library Reference Manual is now distributed with the library.
2501 `make dvi' will produce a DVI file of the printed manual.
2502 `make info' will produce Info files that you can read on line using C-h i
2503 in Emacs or the `info' program.
2504 Please send comments on the manual to bug-glibc-manual@gnu.org.
2506 * The library now supports SVR4 on i386s (i386-unknown-sysv4).
2508 * Brendan Kehoe has contributed a port to Sun SPARCs running Solaris 2.
2510 * Jason Merrill has contributed a port to the Sequent Symmetry running
2511 Dynix version 3 (i386-sequent-dynix).
2513 * The library has been ported to i386s running SCO 3.2.4 (also known as SCO
2514 ODT 2.0; i386-unknown-sco3.2.4) or SCO 3.2 (i386-unknown-sco3.2).
2516 * New function `memory_warnings' lets you arrange to get warnings when
2517 malloc is running out of memory to allocate, like Emacs gives you.
2519 * The C library now contains the relocating allocator used in Emacs 19 for
2520 its editing buffers. This allocator (ralloc) minimizes allocation
2521 overhead and fragmentation by moving allocated regions around whenever it
2522 needs to. You always refer to a ralloc'd region with a "handle" (a
2523 pointer to a pointer--an object of type `void **').
2525 * There is a new `printf' format: `%m' gives you the string corresponding
2526 to the error code in `errno'.
2528 * In `scanf' formats, you can now use `%as' or `%a[' to do the normal `%s'
2529 or `%[' conversion, but instead of filling in a fixed-sized buffer you
2530 pass, the `a' modifier says to fill in a `char **' you pass with a
2533 * The `fnmatch' function supports the new flag bits `FNM_LEADING_DIR' and
2534 `FNM_CASEFOLD'. `FNM_LEADING_DIR' lets a pattern like `foo*' match a
2535 name like `foo/bar'. `FNM_CASEFOLD' says to ignore case in matching.
2537 * `mkstemp' is a traditional Unix function to atomically create and open a
2538 uniquely-named temporary file.
2542 * The standard location for the file that says what the local timezone is
2543 has changed again. It is now `/usr/local/etc/localtime' (or more
2544 precisely, `${prefix}/etc/localtime') rather than `/etc/localtime'.
2546 * The distribution no longer contains any files with names longer than 14
2549 * `struct ttyent' has two new flag bits: TTY_TRUSTED and TTY_CONSOLE.
2550 These are set by the new `trusted' and `console' keywords in `/etc/ttys'.
2552 * New functions `ttyslot' and `syslog' from 4.4 BSD.
2556 * The configuration process has changed quite a bit. The `configure'
2557 script is now used just like the configuration scripts for other GNU
2558 packages. The `sysdeps' directory hierarchy is much rearranged.
2559 The file `INSTALL' explains the new scheme in detail.
2561 * The header files no longer need to be processed into ANSI C and
2562 traditional C versions. There is just one set of files to install, and
2563 it will work with ANSI or old C compilers (including `gcc -traditional').
2565 * Brendan Kehoe and Ian Lance Taylor have ported the library to the
2566 MIPS DECStation running Ultrix 4.
2568 * The Sun 4 startup code (crt0) can now properly load SunOS 4 shared libraries.
2569 Tom Quinn contributed the initial code. The GNU C library can NOT yet be
2570 made itself into a shared library.
2572 * Yet further improved support for the i386, running 4.3 BSD-like systems
2573 (such as Mach 3 with the Unix single-server), or System V.
2575 * New function `strncasecmp' to do case-insensitive string comparison
2576 with limited length.
2578 * New function `strsep' is a reentrant alternative to `strtok'.
2580 * New functions `scandir' and `alphasort' for searching directories.
2582 * New function `setenv' is a better interface to `putenv'.
2584 * Ian Lance Taylor has contributed an implementation of the SVID `ftw'
2585 function for traversing a directory tree.
2587 * The GNU obstack package is now also part of the C library.
2588 The new function `open_obstack_stream' creates a stdio stream that
2589 writes onto an obstack; `obstack_printf' and `obstack_vprintf' do
2590 formatted output directly to an obstack.
2592 * Miscellaneous new functions: reboot, nice, sigaltstack (4.4 BSD only),
2593 cfmakeraw, getusershell, getpass, swab, getttyent, seteuid, setegid.
2595 * `FNM_FILE_NAME' is another name for `FNM_PATHNAME', used with `fnmatch'.
2597 * The new functions `strfry' and `memfrob' do mysterious and wonderful
2598 things to your strings.
2600 * There are some new test programs: test-fseek, testmb, and testrand.
2602 * Some work has been done to begin porting the library to 4.4 BSD and Linux.
2603 These ports are not finished, but are a good starting place for really
2604 supporting those systems.
2606 * `/etc/localtime' is now the standard location for the file that says what
2607 the local timezone is, rather than `/usr/local/lib/zoneinfo/localtime'.
2608 This follows the general principle that `/etc' is the place for all local
2609 configuration files.
2611 * The C library header files now use `extern "C"' when used by the C++
2612 compiler, so the C library should now work with C++ code.
2614 * The header file <bstring.h> is gone. <string.h> now declares bcopy,
2615 bcmp, bzero, and ffs. (Update: nowadays these functions are declared
2618 * Mike Haertel (of GNU e?grep and malloc fame) has written a new sorting
2619 function which uses the `merge sort' algorithm, and is said to be
2620 significantly faster than the old GNU `qsort' function. Merge sort is
2621 now the standard `qsort' function. The new algorithm can require a lot
2622 of temporary storage; so, the old sorting function is called when the
2623 required storage is not available.
2625 * The C library now includes Michael Glad's Ultra Fast Crypt, which
2626 provides the Unix `crypt' function, plus some other entry points.
2628 * The code and header files taken from 4.4 BSD have been updated with the
2629 latest files released from Berkeley.
2631 ----------------------------------------------------------------------
2632 Copyright information:
2634 Copyright (C) 1992-2015 Free Software Foundation, Inc.
2636 Permission is granted to anyone to make or distribute verbatim copies
2637 of this document as received, in any medium, provided that the
2638 copyright notice and this permission notice are preserved,
2639 thus giving the recipient permission to redistribute in turn.
2641 Permission is granted to distribute modified versions
2642 of this document, or of portions of it,
2643 under the above conditions, provided also that they
2644 carry prominent notices stating who last changed them.
2647 version-control: never