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GNU C Library NEWS -- history of user-visible changes.
Copyright (C) 1992-2014 Free Software Foundation, Inc.
See the end for copying conditions.
Please send GNU C library bug reports via <>
using `glibc' in the "product" field.
Version 2.19
* The following bugs are resolved with this release:
156, 387, 431, 762, 832, 926, 2801, 4772, 6786, 6787, 6807, 6810, 6981,
7003, 9721, 9954, 10253, 10278, 11087, 11157, 11214, 12100, 12486, 12751,
12986, 13028, 13982, 13985, 14029, 14032, 14120, 14143, 14155, 14286,
14547, 14699, 14752, 14782, 14876, 14910, 15004, 15048, 15073, 15089,
15128, 15218, 15268, 15277, 15308, 15362, 15374, 15400, 15425, 15427,
15483, 15522, 15531, 15532, 15593, 15601, 15608, 15609, 15610, 15632,
15640, 15670, 15672, 15680, 15681, 15723, 15734, 15735, 15736, 15748,
15749, 15754, 15760, 15763, 15764, 15797, 15799, 15825, 15843, 15844,
15846, 15847, 15849, 15850, 15855, 15856, 15857, 15859, 15867, 15886,
15887, 15890, 15892, 15893, 15895, 15897, 15901, 15905, 15909, 15915,
15917, 15919, 15921, 15923, 15939, 15941, 15948, 15963, 15966, 15968,
15985, 15988, 15997, 16032, 16034, 16036, 16037, 16038, 16041, 16046,
16055, 16071, 16072, 16074, 16077, 16078, 16103, 16112, 16143, 16144,
16146, 16150, 16151, 16153, 16167, 16169, 16172, 16195, 16214, 16245,
16271, 16274, 16283, 16289, 16293, 16314, 16316, 16330, 16337, 16338,
16356, 16365, 16366, 16369, 16372, 16375, 16379, 16384, 16385, 16386,
16387, 16390, 16394, 16398, 16400, 16407, 16408, 16414, 16430, 16431,
16453, 16474, 16506, 16510, 16529
* Slovenian translations for glibc messages have been contributed by the
Translation Project's Slovenian team of translators.
* The public headers no longer use __unused nor __block. This change is to
support compiling programs that are derived from BSD sources and use
__unused internally, and to support compiling with Clang's -fblock
extension which uses __block.
* CVE-2012-4412 The strcoll implementation caches indices and rules for
large collation sequences to optimize multiple passes. This cache
computation may overflow for large collation sequences and may cause a
stack or buffer overflow. This is now fixed to use a slower algorithm
which does not use a cache if there is an integer overflow.
* CVE-2012-4424 The strcoll implementation uses malloc to cache indices and
rules for large collation sequences to optimize multiple passes and falls
back to alloca if malloc fails, resulting in a possible stack overflow.
The implementation now falls back to an uncached collation sequence lookup
if malloc fails.
* CVE-2013-4788 The pointer guard used for pointer mangling was not
initialized for static applications resulting in the security feature
being disabled. The pointer guard is now correctly initialized to a
random value for static applications. Existing static applications need
to be recompiled to take advantage of the fix (bug 15754).
* CVE-2013-4237 The readdir_r function could write more than NAME_MAX bytes
to the d_name member of struct dirent, or omit the terminating NUL
character. (Bugzilla #14699).
* CVE-2013-4332 The pvalloc, valloc, memalign, posix_memalign and
aligned_alloc functions could allocate too few bytes or corrupt the
heap when passed very large allocation size values (Bugzilla #15855,
#15856, #15857).
* CVE-2013-4458 Stack overflow in getaddrinfo with large number of results
for AF_INET6 has been fixed (Bugzilla #16072).
* New locales: ak_GH, anp_IN, ar_SS, cmn_TW, hak_TW, lzh_TW, nan_TW, pap_AW,
pap_CW, quz_PE, the_NP.
* Substantially revised locales: gd_GB, ht_HT
* The LC_ADDRESS field was updated to support country_car for almost all
supported locales.
* ISO 1427 definitions were updated.
* ISO 3166 definitions were updated.
* The localedef utility now supports --big-endian and --little-endian
command-line options to generate locales for a different system from that
for which the C library was built.
* Binary locale files now only depend on the endianness of the system for
which they are generated and not on other properties of that system. As a
consequence, binary files generated with new localedef may be incompatible
with old versions of the GNU C Library, and binary files generated with
old localedef may be incompatible with this version of the GNU C Library,
in the following circumstances:
+ Locale files may be incompatible on m68k systems.
+ Locale archive files (but not separate files for individual locales) may
be incompatible on systems where plain "char" is signed.
* The configure option --disable-versioning has been removed. Builds with
--disable-versioning had not worked for several years.
* ISO 639 definitions were updated for Chiga (cgg) and Chinese (gan, hak, czh,
cjy, lzh, cmn, mnp, cdo, czo, cpx, wuu, hsn, yue).
* SystemTap probes for malloc have been introduced.
* SystemTap probes for slow multiple precision fallback paths of
transcendental functions have been introduced.
* Support for powerpc64le has been added.
* The soft-float powerpc port now supports e500 processors.
* Support for STT_GNU_IFUNC symbols added for ppc32/power4+ and ppc64.
* A new feature test macro _DEFAULT_SOURCE is available to enable the same
set of header declarations that are enabled by default, even when other
feature test macros or compiler options such as -std=c99 would otherwise
disable some of those declarations.
* The _BSD_SOURCE feature test macro no longer enables BSD interfaces that
conflict with POSIX. The libbsd-compat library (which was a dummy library
that did nothing) has also been removed.
* Preliminary documentation about Multi-Thread, Async-Signal and
Async-Cancel Safety has been added.
Version 2.18
* The following bugs are resolved with this release:
2546, 2560, 5159, 6809, 7006, 10060, 10062, 10283, 10357, 10686, 11120,
11561, 12310, 12387, 12492, 12515, 12723, 13550, 13889, 13951, 13988,
14142, 14176, 14200, 14256, 14280, 14293, 14317, 14327, 14478, 14496,
14582, 14686, 14812, 14888, 14894, 14907, 14908, 14909, 14920, 14952,
14964, 14981, 14982, 14985, 14991, 14994, 14996, 15000, 15003, 15006,
15007, 15014, 15020, 15022, 15023, 15036, 15054, 15055, 15062, 15078,
15084, 15085, 15086, 15100, 15160, 15214, 15221, 15232, 15234, 15283,
15285, 15287, 15304, 15305, 15307, 15309, 15327, 15330, 15335, 15336,
15337, 15339, 15342, 15346, 15359, 15361, 15366, 15380, 15381, 15394,
15395, 15405, 15406, 15409, 15416, 15418, 15419, 15423, 15424, 15426,
15429, 15431, 15432, 15441, 15442, 15448, 15465, 15480, 15485, 15488,
15490, 15492, 15493, 15497, 15506, 15529, 15536, 15553, 15577, 15583,
15618, 15627, 15631, 15654, 15655, 15666, 15667, 15674, 15711, 15755,
* CVE-2013-2207 Incorrectly granting access to another user's pseudo-terminal
has been fixed by disabling the use of pt_chown (Bugzilla #15755).
Distributions can re-enable building and using pt_chown via the new configure
option `--enable-pt_chown'. Enabling the use of pt_chown carries with it
considerable security risks and should only be used if the distribution
understands and accepts the risks.
* CVE-2013-0242 Buffer overrun in regexp matcher has been fixed (Bugzilla
* CVE-2013-1914 Stack overflow in getaddrinfo with many results has been
fixed (Bugzilla #15330).
* Add support for calling C++11 thread_local object destructors on thread
and program exit. This needs compiler support for offloading C++11
destructor calls to glibc.
* Improved worst case performance of libm functions with double inputs and
* Support for priority inherited mutexes in pthread condition variables on
non-x86 architectures.
* Port to Xilinx MicroBlaze contributed by David Holsgrove.
* Optimized string functions for AArch64. Implemented by Marcus Shawcroft.
* Optimized string functions for ARM. Implemented by Will Newton and
Richard Henderson.
* Optimized libm functions for SPARC. Implemented by David S. Miller.
* Support for building more of ARM glibc as Thumb-2 code. Implemented by
Richard Henderson.
* Support for building most of MIPS glibc as MIPS16 code. Implemented by
Chung-Lin Tang, Maciej W. Rozycki and Maxim Kuvyrkov.
* Added a benchmark framework to track performance of functions in glibc.
* New <math.h> macro named issignaling to check for a signaling NaN (sNaN).
It is based on draft TS 18661 and currently enabled as a GNU extension.
* On Linux, the clock function now uses the clock_gettime system call
for improved precision, rather than old times system call.
* Added support for version-3 tz format files. This is needed when using
the tz database release 2013e or later, and affects a few unusual cases --
currently only TZ='America/Godthab' for time stamps after 2037.
* Added new API functions pthread_getattr_default_np and
pthread_setattr_default_np to get and set the default pthread
attributes of a process.
* Added support for TSX lock elision for pthread mutexes on i386 and x86-64.
This may improve lock scaling of existing programs on TSX capable systems.
When the --enable-lock-elision=yes parameter is specified at configure
time lock elision will be enabled by default for all PTHREAD_MUTEX_DEFAULT
* Support added for AT_HWCAP2 (to coincide with Linux kernel 3.10
availability). Implemented by Ryan S. Arnold.
* Support added for POWER8 platform. Implemented by Ryan S. Arnold.
Version 2.17
* The following bugs are resolved with this release:
1349, 3439, 3479, 3665, 5044, 5246, 5298, 5400, 6530, 6677, 6778, 6808,
9685, 9914, 10014, 10038, 10114, 10191, 10631, 10873, 11438, 11607, 11638,
11741, 12140, 13013, 13412, 13542, 13601, 13603, 13604, 13629, 13679,
13696, 13698, 13717, 13741, 13759, 13761, 13763, 13881, 13939, 13950,
13952, 13966, 14042, 14047, 14090, 14150, 14151, 14152, 14154, 14157,
14166, 14173, 14195, 14197, 14237, 14246, 14251, 14252, 14283, 14298,
14303, 14307, 14328, 14331, 14336, 14337, 14347, 14349, 14368, 14376,
14417, 14447, 14459, 14476, 14477, 14501, 14505, 14510, 14516, 14518,
14519, 14530, 14532, 14538, 14543, 14544, 14545, 14557, 14562, 14568,
14576, 14579, 14583, 14587, 14595, 14602, 14610, 14621, 14638, 14645,
14648, 14652, 14660, 14661, 14669, 14672, 14683, 14694, 14716, 14719,
14743, 14767, 14783, 14784, 14785, 14793, 14796, 14797, 14801, 14803,
14805, 14807, 14811, 14815, 14821, 14822, 14824, 14828, 14831, 14833,
14835, 14838, 14856, 14863, 14865, 14866, 14868, 14869, 14871, 14872,
14879, 14889, 14893, 14898, 14914.
* Optimization of memcpy for MIPS.
* CVE-2011-4609 svc_run() produces high cpu usage when accept fails with
EMFILE has been fixed (Bugzilla #14889).
* The add-on ports collection is now distributed in the "ports" subdirectory
of the main GNU C Library distribution, rather than separately.
* Port to ARM AArch64 contributed by Linaro.
* Support for STT_GNU_IFUNC symbols added for s390 and s390x.
Optimized versions of memcpy, memset, and memcmp added for System z10 and
zEnterprise z196.
Implemented by Andreas Krebbel.
* The new function secure_getenv allows secure access to the environment,
returning NULL if running in a SUID/SGID process. This function replaces
the internal function __secure_getenv.
* SystemTap static probes have been added into the dynamic linker.
Implemented by Gary Benson.
* Optimizations of string functions strstr, strcasestr and memmem.
Implemented by Maxim Kuvyrkov.
* The minimum Linux kernel version that this version of the GNU C Library
can be used with is 2.6.16.
* Optimizations of string functions memchr, wcschr, wcscpy, and wcsrchr for
powerpc POWER7. Implemented by Will Schmidt.
* New configure option --disable-nscd builds the C library such that it
never attempts to contact the Name Service Caching Daemon (nscd).
New configure option --disable-build-nscd avoids building nscd itself;
this is the default if --disable-nscd is used.
* Improved support for cross-compilation, including cross-testing and
bootstrap builds without a previously built glibc.
* Several testsuite tests are now able to test multiple IFUNC variants of an
interface, rather than just testing the one that would be chooen by
* New configure options --with-bugurl and --with-pkgversion, for
distributors to use to embed their bug-reporting and package version
information in --help and --version output.
* The ttyname and ttyname_r functions on Linux now fall back to searching for
the tty file descriptor in /dev/pts or /dev if /proc is not available. This
allows creation of chroots without the procfs mounted on /proc.
* The `crypt' function now fails if passed salt bytes that violate the
specification for those values. On Linux, the `crypt' function will
consult /proc/sys/crypto/fips_enabled to determine if "FIPS mode" is
enabled, and fail on encrypted strings using the MD5 or DES algorithm
when the mode is enabled.
* The `clock_*' suite of functions (declared in <time.h>) is now available
directly in the main C library. Previously it was necessary to link with
-lrt to use these functions. This change has the effect that a
single-threaded program that uses a function such as `clock_gettime' (and
is not linked with -lrt) will no longer implicitly load the pthreads
library at runtime and so will not suffer the overheads associated with
multi-thread support in other code such as the C++ runtime library.
* New locales: ayc_PE, doi_IN, ia_FR, mni_IN, nhn_MX, niu_NU, niu_NZ,
sat_IN, and szl_PL.
Version 2.16
* The following bugs are resolved with this release:
174, 208, 350, 369, 411, 706, 766, 887, 2074, 2541, 2547, 2548, 2550,
2551, 2552, 2553, 2554, 2562, 2563, 2565, 2566, 2570, 2576, 2636, 2678,
3335, 3440, 3748, 3768, 3866, 3868, 3906, 3976, 3992, 4026, 4108, 4596,
4822, 5077, 5461, 5805, 5993, 6471, 6486, 6578, 6649, 6730, 6770, 6794,
6884, 6890, 6894, 6895, 6907, 6911, 6959, 7064, 9739, 9902, 10110, 10135,
10140, 10153, 10210, 10254, 10346, 10375, 10545, 10716, 10846, 11174,
11261, 11322, 11365, 11451, 11494, 11521, 11677, 11837, 11959, 12047,
12097, 12193, 12194, 12297, 12298, 12301, 12340, 12354, 12416, 12495,
13058, 13223, 13361, 13525, 13526, 13527, 13528, 13529, 13530, 13531,
13532, 13533, 13547, 13551, 13552, 13553, 13555, 13556, 13559, 13563,
13566, 13576, 13579, 13583, 13592, 13594, 13613, 13618, 13637, 13656,
13658, 13673, 13691, 13695, 13704, 13705, 13706, 13718, 13726, 13738,
13739, 13743, 13750, 13758, 13760, 13761, 13775, 13786, 13787, 13792,
13806, 13824, 13840, 13841, 13844, 13846, 13848, 13851, 13852, 13854,
13871, 13872, 13873, 13879, 13882, 13883, 13884, 13885, 13886, 13892,
13895, 13908, 13910, 13911, 13912, 13913, 13914, 13915, 13916, 13917,
13918, 13919, 13920, 13921, 13922, 13923, 13924, 13926, 13927, 13928,
13938, 13941, 13942, 13954, 13955, 13956, 13963, 13967, 13968, 13970,
13973, 13979, 13983, 13986, 13996, 14012, 14027, 14033, 14034, 14036,
14040, 14043, 14044, 14048, 14049, 14050, 14053, 14055, 14059, 14064,
14075, 14080, 14083, 14103, 14104, 14109, 14112, 14117, 14122, 14123,
14134, 14153, 14183, 14188, 14199, 14210, 14218, 14229, 14241, 14273,
14277, 14278.
* Support for the x32 ABI on x86-64 added. The x32 target is selected by
configuring glibc with:
BUILD_CC='gcc' CC='gcc -mx32' CXX='g++ -mx32'
Visit <> for more x32 ABI info.
Implemented by H.J. Lu.
* ISO C11 support:
+ define static_assert
+ do not declare gets
+ declare at_quick_exit and quick_exit also for ISO C11
+ aligned_alloc. NB: The code is deliberately allows the size parameter
to not be a multiple of the alignment. This is a moronic requirement
in the standard but it is only a requirement on the caller, not the
+ timespec_get added
+ uchar.h support added
Implemented by Ulrich Drepper.
* Support for the IA-64 has been moved to ports.
* Remove support for anything but ELF binary format
* Checking versions of poll, ppoll added.
Implemented by Ulrich Drepper.
* More generic and 64-bit performance optimizations to math functions.
Implemented by Ulrich Drepper.
* New configure option --enable-obsolete-rpc makes the deprecated RPC
headers and functions available at compile time as they were before
version 2.14. This option will be removed at some time in the future
after the TI-RPC library becomes fully sufficient for the needs of
existing applications.
* Compatibility code for Linux kernel versions before 2.4 has been removed.
Note that glibc is not expected to work with any Linux kernel version
before 2.6.
* New header <sys/auxv.h> and function getauxval allowing easy access to
the AT_* key-value pairs passed from the Linux kernel. The header also
defines the HWCAP_* bits associated with the AT_HWCAP key.
* New locales: mag_IN
* New configure option --enable-systemtap builds SystemTap static probes
into libc for setjmp and longjmp and into libpthread for various operations.
So far the setjmp/longjmp probes and some of the libpthread probes are
provided only for i*86 and x86_64.
Implemented by Roland McGrath and Rayson Ho.
* Optimized expf for x86-32 and x86-64. Implemented by Liubov Dmitrieva.
* More optimized functions for PowerPC. Implemented by Adhemerval Zanella
and Will Schmidt.
* More optimized functions for SPARC. Implemented by David S. Miller.
* Improved support for cross-compilation, especially bootstrap builds
without a previously built glibc.
* Ports for the TILE-Gx and TILEPro families of processors. Contributed by
Chris Metcalf from Tilera.
* Support for the old ARM ABI has been removed from ports. Only the EABI is
now supported for ARM processors.
* The hard-float variant of the ARM EABI now uses /lib/
as the name of the dynamic linker, to distinguish it from the
/lib/ dynamic linker used for the base EABI.
* Support for CRIS has been removed from ports.
* A new class of installed header has been documented for low-level
platform-specific functionality. PowerPC added the first instance with a
function to provide time base register access. Contributed by Tulio
Magno Quites Machado Filho.
* ix86 configurations now install header files that are consistent with
what x86-64 configurations install. These same header files can be used
for -m32, -m64, or -mx32 builds.
Contributed by H.J. Lu.
* Math library bug fixes. A thorough audit of all open math library bugs was
conducted by Joseph Myers. Significant progress was made on many math
library bugs resulting in more accurate exceptions and function results.
Many thanks to all those that contributed including Andreas Jaeger for his
patch review and work on the x87 trigonometric instruction issues.
* Timezone data is no longer installed. Timezone-related binaries and scripts
will continue to be installed. Users should obtain their timezone data from
their distribution provider or from the tzdata package at
Version 2.15
* The following bugs are resolved with this release:
6779, 6783, 9696, 10103, 10709, 11589, 11929, 12403, 12786, 12840, 12847,
12868, 12852, 12874, 12885, 12892, 12906, 12907, 12922, 12935, 12962,
13007, 13021, 13061, 13062, 13067, 13068, 13085, 13088, 13090, 13092,
13096, 13114, 13118, 13123, 13134, 13138, 13147, 13150, 13166, 13179,
13185, 13189, 13192, 13268, 13276, 13282, 13291, 13305, 13328, 13335,
13337, 13344, 13358, 13367, 13413, 13416, 13423, 13439, 13446, 13472,
13484, 13506, 13515, 13523, 13524, 13538, 13540
* New program pldd to list loaded object of a process
Implemented by Ulrich Drepper.
* Add nss_db support back to glibc. No more dependency on Berkeley db
and support for initgroups lookups.
Implemented by Ulrich Drepper.
* Optimized strcpy, strncpy, stpcpy, stpncpy for SSE2 and SSSE3 on x86-32.
Contributed by HJ Lu.
* Improved strcpy, strncpy, stpcpy, stpncpy for SSE2 and SSSE3 on x86-64.
Contributed by HJ Lu.
* Optimized strcat, strncat on x86-64 and optimized wcscmp, wcslen, strnlen
on x86-32 and x86-64.
Contributed by Liubov Dmitrieva.
* Optimized strchr and strrchr for SSE on x86-32.
Contributed by Liubov Dmitrieva.
* Optimized memchr, memrchr, rawmemchr, memcmp, wmemcmp, wcschr, wcscpy
for x86-64 and x86-32.
Contributed by Liubov Dmitrieva.
* New interfaces: scandirat, scandirat64
Implemented by Ulrich Drepper.
* Checking versions of FD_SET, FD_CLR, and FD_ISSET added.
Implemented by Ulrich Drepper.
* nscd now also caches the netgroup database.
Implemented by Ulrich Drepper.
* Integrate libm with gcc's -ffinite-math-only option.
Implemented by Ulrich Drepper.
* Lots of generic, 64-bit, and x86-64-specific performance optimizations
to math functions. Implemented by Ulrich Drepper.
* Optimized strcasecmp and strncasecmp for AVX on x86-64.
Implemented by Ulrich Drepper.
* New Linux interfaces: process_vm_readv, process_vm_writev
* Optimized strcasecmp and strncasecmp for SSSE3 and SSE4.2 on x86-32.
Implemented by Ulrich Drepper.
* Optimized nearbyint and strcasecmp for PPC.
Implemented by Adhemerval Zanella.
* New locales: bho_IN, unm_US, es_CU, ta_LK
Version 2.14
* The following bugs are resolved with this release:
386, 6420, 7101, 9730, 9732, 9809, 10138, 10149, 10157, 11099, 11257,
11258, 11487, 11532, 11558, 11578, 11634, 11653, 11668, 11697, 11724,
11781, 11799, 11820, 11837, 11857, 11869, 11892, 11895, 11901, 11945,
11947, 11952, 11987, 12052, 12083, 12158, 12178, 12200, 12346, 12350,
12393, 12420, 12432, 12445, 12449, 12453, 12454, 12460, 12469, 12489,
12509, 12510, 12511, 12518, 12527, 12541, 12545, 12551, 12582, 12583,
12587, 12597, 12601, 12611, 12625, 12626, 12631, 12650, 12653, 12655,
12660, 12671, 12681, 12684, 12685, 12711, 12713, 12714, 12717, 12723,
12724, 12734, 12738, 12746, 12766, 12775, 12777, 12782, 12788, 12792,
12795, 12811, 12813, 12814, 12841
* The RPC implementation in libc is obsoleted. Old programs keep working
but new programs cannot be linked with the routines in libc anymore.
Programs in need of RPC functionality must be linked against TI-RPC.
The TI-RPC implementation is IPv6 enabled and there are other benefits.
Visible changes of this change include (obviously) the inability to link
programs using RPC functions without referencing the TI-RPC library and the
removal of the RPC headers from the glibc headers.
Implemented by Ulrich Drepper.
* New Linux interfaces: clock_adjtime, name_to_handle_at, open_by_handle_at,
syncfs, setns, sendmmsg
* New locales: os_RU, bem_ZA, en_ZA, ff_SN, sw_KE, sw_TZ, lb_LU, wae_CH,
yue_HK, lij_IT, mhr_RU
* New encodings: CP770, CP771, CP772, CP773, CP774
* New program sotruss to trace calls through PLTs
Implemented by Ulrich Drepper.
* The malloc hook implementation is marked deprecated and will be removed
from the default implementation in the next version. The design never
worked ever since the introduction of threads. Even programs which do
not create threads themselves can use multiple threads created internally.
Version 2.13
* The following bugs are resolved with this release:
3268, 6812, 7066, 10085, 10484, 10563, 10851, 11149, 11155, 11577, 11611,
11640, 11655, 11701, 11840, 11856, 11883, 11903, 11904, 11968, 11979,
12005, 12037, 12067, 12077, 12078, 12092, 12093, 12107, 12108, 12113,
12140, 12159, 12167, 12191, 12194, 12201, 12204, 12205, 12207, 12348,
12378, 12394, 12397
* New Linux interfaces: prlimit, prlimit64, fanotify_init, fanotify_mark
* POWER7 optimizations: memset, memcmp, strncmp
* New optimized string functions for x86-64: strnlen (SSE2),
strcasecmp (SSE2, SSSE3, SSE4.2), strncasecmp (SSE2, SSSE3, SSE4.2)
Implemented by Ulrich Drepper.
Version 2.12
* The following bugs are resolved with this release:
3662, 4457, 5553, 10162, 10401, 10414, 10554, 10824, 10864, 10915,
10918, 10936, 10939, 10958, 10968, 10969, 10972, 10992, 11000, 11001,
11007, 11010, 11027, 11039, 11040, 11041, 11043, 11046, 11056, 11070,
11093, 11115, 11125, 11126, 11127, 11134, 11141, 11149, 11183, 11184,
11185, 11186, 11187, 11188, 11189, 11190, 11191, 11192, 11193, 11194,
11200, 11230, 11235, 11242, 11254, 11258, 11271, 11272, 11276, 11279,
11287, 11292, 11319, 11332, 11333, 11387, 11389, 11390, 11394, 11397,
11410, 11438, 11449, 11470, 11471, 11520, 11537, 11538, 11571
* New interfaces: pthread_getname_np, pthread_setname_np
* New Linux interface: recvmmsg
* STT_GNU_IFUNC implemented for Sparc by David Miller.
* The dynamic linker now recognizes supported ABI versions from the
EI_ABIVERSION field in the ELF header.
Implemented by Ulrich Drepper.
* New NIS mode selector ADJUNCT_AS_SHADOW. The passwd.adjunct.byname table
will not be used to fill in password fields in the passwd.byname replies.
Instead it is used to synthesize the shadow.byname table, should it be
missing. This is a useful mode in some installations involving Solaris.
Implemented by Ulrich Drepper.
* New locales: kok_IN, sq_MK, cv_RU
Version 2.11
* The following bugs are resolved with this release:
3270, 7094, 9924, 9986, 10011, 10085, 10107, 10159, 10162, 10166, 10183,
10195, 10196, 10200, 10203, 10207, 10211, 10213, 10217, 10221, 10229,
10262, 10286, 10312, 10315, 10319, 10349, 10360, 10391, 10402, 10416,
10418, 10422, 10425, 10446, 10448, 10452, 10540, 10553, 10560, 10564,
10609, 10643, 10692, 10713, 10717, 10730, 10731, 10742, 10780, 10784,
10789, 10817, 10823, 10840, 10847
* New interfaces: execvpe, pthread_sigqueue, mkstemps, mkstemps64, mkostemps,
Implemented by Ulrich Drepper.
* Checking version of longjmp added that fails if an uninitialized stack
frame would be created. Implemented by Ulrich Drepper.
* STT_GNU_IFUNC is now supported in static executables.
Implemented by H.J. Lu.
* STT_GNU_IFUNC implemented for PPC by Alan Modra.
* New optimized string functions for x86-64: strstr, strcasestr, memcmp,
strcspn, strpbrk, strspn, strcpy, stpcpy, strncpy, strcmp (SSE2, SSE4.2),
strncmp (SSE2, SSE4.2), strchr (SSE4.2), strrchr (SSE4.2).
Contributed by H.J. Lu.
strlen, rawmemchr, strcmp (SSSE3), strncmp (SSSE3).
Implemented by Ulrich Drepper.
* New optimized string functions for x86: strlen, strcspn, strspn, strpbrk,
strstr, strcasestr.
Contributed by H.J. Lu.
* Support for fma instruction in AVX on x86-64.
Implemented by H.J. Lu and Ulrich Drepper.
* AVX support in x86-64 auditing support in
Implemented by H.J. Lu.
* STB_GNU_UNIQUE support added.
Implemented by Ulrich Drepper.
* Implement second fallback mode for optimized DNS lookup for even more
broken environments. If two requests from the same port are not
handled correctly close the socket and open a new one before sending
the second request. The 'single-request-reopen' option in /etc/resolv.conf
can be used to select this mode right away, instead of rediscovering the
necessity is every process again.
Implemented by Ulrich Drepper.
* New resolver flag RES_USE_DNSSEC to enable use of verified lookup.
Implemented by Adam Tkac.
* Optimized iconv conversions for S390x.
Implemented by Andreas Krebbel.
* Using condvars with PI mutexes is now more efficient due to kernel
support for requeueing to PI futexes. NPTL support added for x86-64.
Implemented by Ulrich Drepper.
* New locales: ps_AF, my_MM
Version 2.10
* The following bugs are resolved with this release:
697, 5381, 5807, 6411, 6545, 7040, 7058, 7067, 7080, 7083, 7095, 7098,
9677, 9694, 9697, 9701, 9704, 9705, 9706, 9720, 9726, 9730, 9733, 9736,
9741, 9750, 9753, 9759, 9781, 9791, 9793, 9823, 9833, 9844, 9880, 9881,
9891, 9893, 9895, 9913, 9916, 9920, 9948, 9955, 9957, 9963, 9985, 10052,
10069, 10086, 10087, 10090, 10092, 10093, 10100, 10118, 10128
* New interfaces: preadv, preadv64, pwritev, pwritev64, malloc_info
Implemented by Ulrich Drepper.
* New Linux interfaces: accept4, fallocate, fallocate64.
Implemented by Ulrich Drepper.
* Correct declarations of string function when used in C++ code. This
could lead to compile errors for invalid C++ code.
* XPG7/POSIX 2008 compilation environment. Many GNU-specific functions are
now in POSIX.
* New POSIX 2008 interface: psiginfo
Implemented by Ulrich Drepper.
* New ISO C++1x interfaces: quick_exit, at_quick_exit
Implemented by Ulrich Drepper.
* Support for selecting between multiple function definitions at runtime
using STT_GNU_IFUNC symbols. Implemented by Ulrich Drepper.
* The libcrypt library can now use the hash function implementations in
NSS. Implemented by Ulrich Drepper.
* The malloc implementation can be compiled to be less memory efficient
but higher performing in multi-threaded programs.
Implemented by Ulrich Drepper.
* New locales: nan_TW@latin, ks_IN
* Faster strlen, strchr, strchrnul, strrchr, memchr, and rawmemchr for x86-64.
Implemented by Ulrich Drepper.
* Extended printf hook support. It is possible to use user-defined types
and extend existing format specifiers.
Implemented by Ulrich Drepper.
* Handling for group shadow files has been added.
Implemented by Ulrich Drepper.
* DNS IPv4-IPv6 parallel lookup now deals better with broken DNS
servers (the case, e.g., for some people using the built-in DNS
server in ADSL modems/routers). There is a once-per-process timeout
in case of a broken server. To avoid it, users can run nscd or put
'options single-request' in /etc/resolv.conf.
Implemented by Ulrich Drepper.
Version 2.9
* The following bugs are resolved with this release:
3406, 5209, 5210, 5381, 5794, 5814, 5911, 6428, 6438, 6442, 6447, 6461,
6472, 6505, 6544, 6589, 6612, 6634, 6653, 6654, 6657, 6698, 6712, 6713,
6719, 6723, 6724, 6740, 6763, 6771, 6790, 6791, 6817, 6824, 6839, 6843,
6845, 6856, 6857, 6860, 6867, 6875, 6919, 6920, 6942, 6947, 6955, 6966,
6968, 6974, 6980, 6995, 7008, 7009, 7029
* Unified lookup for getaddrinfo: IPv4 and IPv6 addresses are now looked
up at the same time. Implemented by Ulrich Drepper.
* TLS descriptors for LD and GD on x86 and x86-64.
Implemented by Alexandre Oliva.
* getaddrinfo now handles DCCP and UDPlite.
Implemented by Ulrich Drepper.
* New fixed-size conversion macros: htobe16, htole16, be16toh, le16toh,
htobe32, htole32, be32toh, le32toh, htobe64, htole64, be64toh, le64toh.
Implemented by Ulrich Drepper.
* New implementation of memmem, strstr, and strcasestr which is O(n).
Implemented by Eric Blake.
* New Linux interfaces: inotify_init1, dup3, epoll_create1, pipe2
* Implement "e" option for popen to open file descriptor with the
close-on-exec flag set. Implemented by Ulrich Drepper.
* Implement "b" mode for fmemopen. In this mode writes writes don't
implicitly add a NUL byte and seeks from the end of the buffer really
use the buffer end, not the string length as the basis.
Implemented by Ulrich Drepper.
* Many functions, exported and internal, now atomically set the close-on-exec
flag when run on a sufficiently new kernel. Implemented by Ulrich Drepper.
* Sorting rules for some Indian languages (Kannada, Gurumukhi, Telugu,
Implemented by Pravin Satpute.
* New locales: sd_IN, sd_IN@devanagari, ks_IN@devanagari, ht_HT, en_AG, nl_AW.
Version 2.8
* The following bugs are resolved with this release:
2549, 3112, 4314, 4407, 4997, 5012, 5040, 5112, 5204, 5208, 5209, 5220,
5222, 5224, 5225, 5237, 5238, 5240, 5245, 5277, 5346, 5375, 5378, 5382,
5424, 5427, 5428, 5435, 5436, 5439, 5441, 5442, 5443, 5451, 5452, 5454,
5455, 5463, 5464, 5465, 5475, 5477, 5478, 5520, 5541, 5545, 5553, 5600,
5602, 5607, 5614, 5627, 5628, 5736, 5737, 5741, 5753, 5760, 5762, 5768,
5774, 5777, 5778, 5779, 5786, 5790, 5818, 5854, 5857, 5903, 5939, 5979,
5983, 5995, 5998, 6004, 6007, 6020, 6021, 6024, 6040, 6042
* New locales: bo_CN, bo_IN, shs_CA.
* New encoding: HP-ROMAN9, HP-GREEK8, HP-THAI8, HP-TURKISH8.
* Sorting rules for some Indian languages (Devanagari and Gujarati).
Implemented by Pravin Satpute.
* IPV6 addresses in /etc/resolv.conf can now have a scope ID
* nscd caches now all timeouts for DNS entries
Implemented by Ulrich Drepper.
* nscd is more efficient and wakes up less often.
Implemented by Ulrich Drepper.
* More checking functions: asprintf, dprintf, obstack_printf, vasprintf,
vdprintf, and obstack_vprintf.
Implemented by Jakub Jelinek.
* Faster memset for x86-64.
Implemented by Harsha Jagasia and H.J. Lu.
* Faster memcpy on x86.
Implemented by Ulrich Drepper.
* ARG_MAX is not anymore constant on Linux. Use sysconf(_SC_ARG_MAX).
Implemented by Ulrich Drepper.
* Faster sqrt and sqrtf implemention for some PPC variants.
Implemented by Steven Munroe.
Version 2.7
* The following bugs are resolved with this release:
4125, 4126, 4178, 4359, 4407, 4512, 4514, 4525, 4554, 4556, 4557, 4566,
4582, 4586, 4588, 4599, 4610, 4647, 4702, 4705, 4726, 4745, 4772, 4773,
4775, 4776, 4792, 4813, 4814, 4816, 4833, 4858, 4860, 4896, 4905, 4925,
4936, 4937, 4938, 4941, 4946, 4963, 4972, 5010, 5028, 5043, 5058, 5063,
5071, 5103, 5104, 5112, 5113, 5184, 5186
* More checking functions: fread, fread_unlocked, open*, mq_open.
Implemented by Jakub Jelinek and Ulrich Drepper.
* Extend fortification to C++. Implemented by Jakub Jelinek.
* Implement 'm' modifier for scanf. Add stricter C99/SUS compliance
by not recognizing 'a' as a modifier when those specs are requested.
Implemented by Jakub Jelinek.
* PPC optimizations to math and string functions.
Implemented by Steven Munroe.
* New interfaces: mkostemp, mkostemp64. Like mkstemp* but allow additional
options to be passed. Implemented by Ulrich Drepper.
* More CPU set manipulation functions. Implemented by Ulrich Drepper.
* New Linux interfaces: signalfd, eventfd, eventfd_read, and eventfd_write.
Implemented by Ulrich Drepper.
* Handle private futexes in the NPTL implementation.
Implemented by Jakub Jelinek and Ulrich Drepper.
* Add support for O_CLOEXEC. Implement in Hurd. Use throughout libc.
Implemented by Roland McGrath and Ulrich Drepper.
* Linux/x86-64 vDSO support. Implemented by Ulrich Drepper.
* SHA-256 and SHA-512 based password encryption.
Implemented by Ulrich Drepper.
* New locales: ber_DZ, ber_MA, en_NG, fil_PH, fur_IT, fy_DE, ha_NG, ig_NG,
ik_CA, iu_CA, li_BE, li_NL, nds_DE, nds_NL, pap_AN, sc_IT, tk_TM, ug_CN,
+ New iconv modules: MAC-CENTRALEUROPE, ISO-8859-9E, KOI8-RU.
Implemented by Ulrich Drepper.
Version 2.6
* The following bugs are resolved with this release:
3156, 3213, 3285, 3291, 3306, 3313, 3320, 3322, 3325, 3326, 3334, 3348,
3352, 3363, 3369, 3426, 3427, 3429, 3451, 3458, 3465, 3480, 3483, 3493,
3514, 3515, 3559, 3632, 3664, 3673, 3674, 3745, 3747, 3818, 3840, 3842,
3851, 3855, 3884, 3885, 3902, 3905, 3919, 3944, 3954, 3955, 3957, 3991,
3995, 3996, 4024, 4040, 4069, 4070, 4074, 4076, 4096, 4101, 4102, 4114,
4130, 4131, 4181, 4276, 4306, 4342, 4344, 4349, 4364, 4368, 4381, 4392,
4403, 4405, 4406, 4411, 4438, 4439, 4455, 4456, 4465, 4512, 4514, 4586,
4702, 4858
* New Linux interfaces: epoll_pwait, sched_getcpu.
* New generic interfaces: strerror_l.
* nscd can now cache the services database. Implemented by Ulrich Drepper.
Version 2.5
* The following bugs are resolved with this release:
39, 68, 192, 352, 388, 531, 935, 1006, 1201, 1203, 1386, 1782, 1783, 1784,
1785, 1786, 1787, 1951, 1974, 1996, 2072, 2098, 2125, 2134, 2158, 2182,
2349, 2376, 2386, 2389, 2415, 2418, 2420, 2423, 2450, 2451, 2466, 2472,
2473, 2477, 2498, 2499, 2501, 2502, 2505, 2507, 2508, 2509, 2517, 2526,
2569, 2571, 2592, 2611, 2625, 2632, 2644, 2662, 2680, 2683, 2684, 2693,
2695, 2703, 2734, 2751, 2764, 2766, 2775, 2792, 2821, 2823, 2832, 2841,
2843, 2883, 2892, 2908, 2914, 2926, 2961, 2978, 2980, 2987, 2997, 2998,
3013, 3018, 3034, 3040, 3044, 3123, 3124, 3137, 3138, 3143, 3155, 3189,
3225, 3251, 3252, 3253, 3273
* For Linux, the sorting of addresses returned by getaddrinfo now also
handles rules 3, 4, and 7 from RFC 3484. I.e., all rules are handled.
Implemented by Ulrich Drepper.
* Allow system admin to configure getaddrinfo with the /etc/gai.conf file.
Implemented by Ulrich Drepper.
* New Linux interfaces: splice, tee, sync_file_range, vmsplice.
* New iconv module for MIK. Contributed by Alexander Shopov.
* For sites with broken group and/or passwd database, the auto-propagate
option of nscd can prevent creating ID lookup entries from the results
of a name lookup and vice versa. This usually is no problem but some
site might have problems with the default behavior.
Implemented by Ulrich Drepper.
* Iterating over entire database in NIS can be slow. With the
SETENT_BATCH_READ option in /etc/default/nss a system admin can decide
to trade time for memory. The entire database will be read at once.
Implemented by Ulrich Drepper.
* The interfaces introduced in RFC 3542 have been implemented by
Ulrich Drepper.
* Support for the new ELF hash table format was added by Ulrich Drepper.
* Support for priority inheritance mutexes added by Jakub Jelinek and
Ulrich Drepper.
* Support for priority protected mutexes added by Jakub Jelinek.
* New locales: nr_ZA, pa_PK, ca_AD, ca_FR, ca_IT, el_CY, tr_CY, as_IN,
or_IN, csb_PL, fy_NL, sr_ME.
Version 2.4
* More overflow detection functions.
* New iconv converters for IBM1025, IBM1122, IBM1137, IBM1153,
IBM1154, IBM1155, IBM1156, IBM1157, and IBM1158 contributed by Jiro Sekiba.
More converters for IBM803, IBM901, IBM902, IBM921, IBM1008, IBM1097,
IBM1112, IBM1123, IBM1130, IBM1140, IBM1141, IBM1142, IBM1143, IBM1144,
IBM1145, IBM1146, IBM1147, IBM1148, IBM1149, IBM1166, IBM1167, IBM4517,
IBM4899, IBM4909, IBM4971, IBM5347, IBM9030, IBM9066, IBM9448, IBM12712,
IBM16804, IBM1364, IBM1371, IBM1388, IBM1390, and IBM1399 contributed
by Masahide Washizawa.
* It is now possible to install audit libraries for the dynamic linker using
LD_AUDIT. Implemented by Ulrich Drepper.
* The LinuxThreads add-on, providing pthreads on Linux 2.4 kernels, is no
longer supported. The new NPTL implementation requires Linux 2.6 kernels.
For a libc and libpthread that works well on Linux 2.4 kernels, we
recommend using the stable 2.3 branch.
* The new function open_wmemstream acts like open_memstream,
but uses a wchar_t wide character buffer.
* The new function ppoll is an improved version of poll, similar to pselect.
* New interfaces: fdopendir, openat, fstatat, fchmodat, fchownat,
futimesat, faccessat, mkdirat, mkfifoat, mknodat,
renameat, unlinkat, linkat, symlinkat, readlinkat.
* New Linux kernel system calls: unshare,
inotify_init, inotify_add_watch, inotify_rm_watch.
* The euidaccess function is now also known by the alias eaccess,
for compatibility with some other systems.
* Timezone data updated to 2006b version.
Version 2.3.6
* The following bugs are resolved with this release:
38, 253, 549, 622, 653, 721, 758, 851, 877, 915, 934, 955, 961,
1016, 1037, 1076, 1079, 1080, 1081, 1082, 1083, 1084, 1085, 1086,
1087, 1088, 1090, 1091, 1092, 1093, 1094, 1095, 1096, 1097, 1098,
1099, 1100, 1101, 1102, 1103, 1104, 1105, 1106, 1107, 1108, 1109,
1110, 1111, 1112, 1113, 1125, 1137, 1138, 1249, 1250, 1251, 1252,
1253, 1254, 1350, 1358, 1394, 1438, 1498, 1534
Visit <> for the details of each bug.
* As of this release, GCC 4 can be used to compile the C Library.
* Timezone data updated to 2005m version.
Version 2.3.5
* The following bugs are resolved with this release:
284, 592, 602, 626, 633, 640, 650, 661, 671, 681, 693, 700, 710, 719,
722, 723, 725, 726, 727, 728, 729, 730, 731, 732, 733, 734, 735, 736,
737, 738, 739, 740, 741, 742, 743, 744, 745, 765, 767, 768, 769, 776,
777, 787, 821, 822, 823, 825
Visit <> for the details of each bug.
Version 2.3.4
* Support for RFC 3678. Real implementations exist only for Linux so far.
Implemented by Ulrich Drepper.
* nscd can now cache entries persistently. Expiring entries are reloaded.
For speedups the cache can be shared in memory with client processes.
Implemented by Ulrich Drepper.
* nscd can now perform SELinux checks.
Implemented by Matthew Rickard <>.
* getaddrinfo queries are now cached. Canonical name lookup is performed
Implemented by Ulrich Drepper.
* The nothrow function attribute is used when headers are used by gcc when
compiling C code. This can avoid significant amounts of exception
handling data.
* The malloc functions perform more error checking and are stricter when
it comes to reacting on errors. The default action is to terminate
the process after showing an error message. Implemented by Ulrich Drepper.
* Reverse lookups of IPv6 addresses does not use bit string or
lookups anymore unless explicitly requested. Implemented by Ulrich Drepper.
* Namespaces in are implemented. DSOs can be loaded in separate
namespaces using the new function dlmopen(). This feature is of course,
like most other dynamic loading functionality, not available in statically
linked applications. Implemented by Ulrich Drepper.
* Low-overhead boundary checking variants of string and some stdio functions
were added. These are to be used in conjunction with a gcc patch by
Jakub Jelinek which adds calls to these functions if possible.
Implemented by Jakub Jelinek and Ulrich Drepper.
* Old code for several operating systems and machine architectures that
have not been in working condition in a long time have been removed from
the main source tree maintained by the GNU C Library's maintainers.
These files are now reside in the separate `ports' source module
that is usable as an add-on when building the library.
Version 2.3.3
* New functions `dladdr1' and `dlinfo' in <dlfcn.h> provide more ways to
interrogate the dynamic linker, compatible with the Solaris interface.
* ELF thread-local storage support (TLS) now works on PowerPC and PowerPC64;
implemented by Paul Mackerras, Steven Munroe, and Roland McGrath.
* getifaddrs now uses the netlink interface on Linux to get its information.
Implemented by Thorsten Kukuk.
* getaddrinfo now implements AI_V4MAPPED, AI_ALL, and AI_ADDRCONF.
Implemented by Ulrich Drepper.
* support for non-executable stacks on x86 has been added. Changes mostly
by Roland McGrath.
* regex is now much faster for multibyte locales. Changes by Jakub Jelinek
and Ulrich Drepper.
* getaddrinfo now performs destination address selection according to
RFC 3484.
Version 2.3.2
* Thread-safe interfaces for many functions that access locale data
were added in version 2.3, but these features were omitted from NEWS.
Many functions have variants with an `_l' suffix that take a `locale_t'
object as a parameter rather than consulting the current locale.
The new functions `newlocale', `duplocale', and `freelocale' in <locale.h>
create and maintain `locale_t' objects. Additionally, the new function
`uselocale' sets "the current locale" (as used by functions not so
parameterized) set for an individual thread. These features were added
in version 2.3, implemented by Ulrich Drepper and Roland McGrath.
* The functions getresuid, getresgid, setresuid, and setresgid, which
have long been available on Linux, are now declared in <unistd.h>
and are now also available on the Hurd.
* ELF thread-local storage support (TLS) now works on x86-64.
* The new dynamic string token $LIB is expanded in shared library names.
This normally expands to lib, but on some 64-bit platforms to lib64 instead.
* Aldy Hernandez contributed complete software floating point support for
PowerPC machines with no FPU.
* fexecve is implemented on Linux.
* The `btowc' function should work at least twice as fast due to
specialized callbacks in the iconv modules. Implemented by Bruno Haible.
* With approriate thread add-ons cancelable functions are now implemented
in as well. No need to call the function in libpthread. This
change allowed to finally disable the incorrect and expensive handling
of weak definition in
* Yet more PLT entries in have been removed. We finally arrived
at the bare minimum. Startup times improved appropriately.
* Support for the new Linux/x86 system call interface was added. The
AT_SYSINFO auxiliary vector entry is recognized and handled.
Version 2.3
* Masahide Washizawa contributed iconv modules for IBM1163 and IBM1164
* iconv (the program and the interface) now accepts empty names (excluding
options like //TRANSLIT) to mean "use charset of current locale".
* localedef can now transliterate characters in strings which are not in
the provided charmap. The information from the input locale is used.
* Prelinking support was added for ELF targets. This requires additional
tools and recent versions of the GNU binutils. Contributed by Jakub Jelinek.
* Read-only stdio streams now use mmap to speed up operation by eliminating
copying and buffer underflows. To use add 'm' to the mode string of
the fopen/fdopen/freopen call. Implemented by Ulrich Drepper.
* The malloc functions were completely rewritten by Wolfram Gloger based
on Doug Lea's malloc-2.7.0.c.
* Isamu Hasegawa contributed a completely new and POSIX-conformant
implementation of regex.
* Bruno Haible upgraded the iconv and locale implementation to support
Unicode 3.2.
* Contents of the LC_* and LANG environment variables in the CEN style are
not recognized anymore. It never was used. Change by Ulrich Drepper.
* The runtime (, libc, libpthread for Linux) now can handle the ELF
thread-local storage (TLS) ABI on some platforms.
Changes by Ulrich Drepper. SH support by Kaz Kojima.
* Bruno Haible contributed iconv converters for ISO-2022-JP-3, SHIFT JIS-X0213,
EUC-JISX0213, and TSCII.
* New header <ifaddrs.h> with functions `getifaddrs' and `freeifaddrs':
BSD-compatible interface for getting all network interface addresses.
Implementation for IPv4 by Roland McGrath.
* Loading of locale data is faster due to the introduction of a locale
archive. Implemented by Roland McGrath and Ulrich Drepper.
* Startup times are significantly reduced by not using exported functions
inside the library itself. Changes by Jakub Jelinek, Roland McGrath,
and Ulrich Drepper.
* Steven Munroe contributed a port to PowerPC64/Linux.
Version 2.2.6
* The Hurd now uses the GNU libio implementation of stdio rather than the
old GNU stdio implementation, and uses a new ABI (
* The Hurd on x86 now has the `ioperm' function and <sys/io.h> header file
with the same behavior as the Linux system call of the same name.
Version 2.2.5
* Stephen Moshier implemented log2, log10, powl and cbrtl for the
128-bit long double format.
* Masahide Washizawa contributed iconv modules for IBM1132, IBM1133, IBM1160,
IBM1161, and IBM1162 charsets.
* Andreas Jaeger contributed a port to x86-64/Linux.
* Peter Bruin contributed a port to PowerPC/Hurd.
* libc functions using I/O streams now can handle wide-oriented streams
as well.
* optimizations in the dynamic linker. Binaries created by recent binutils
versions start up quicker due to reduced time spent on relocations.
* Support for use of gcc3 added by Jakub Jelinek and HJ Lu.
Version 2.2.4
* Stephen Moshier implemented cosh, expm1, log1p, acos, sinh, tanh,
asinh, atanh, j0 for the 128-bit long double format.
* Bruno Haible updated all the code handling Unicode in some form to
support Unicode 3.1.
* Speed of regex for single-byte locales is back to previous levels.
Patch by Isamu Hasegawa.
* Alpha, SPARC, and IA-64 now also using floating stacks.
* Startup time of internationalized applications greatly improved through
iconv cache. Use iconvconfig to generate the cache file.
Contributed by Ulrich Drepper.
* The IA-64 specific part of was rewritten to eliminate some pretty
severe performance problems. Patch by David Mosberger.
* The Hurd port got a lot more functionality like AIO, various stdio
extensions, etc. Mainly done by Roland McGrath.
* mtrace can now lookup symbols in shared libraries.
Version 2.2.3
* Intel's IA-64 math library is largely integrated. It provides fast and
accurate implementatations for most basic and standard math functions
in float, double, and long double format.
* Stephen Moshier implemented j0, j1, jn, y0, y1, yn, lgamma, erf, erfc,
and asin for the 96-bit long double format and asin, log, tan for the
128-bit long double format.
* The beginning of a last-bit accurate math library by IBM Haifa were added.
The basic double functions exist today. Contributed by Abraham Ziv
<>, Moshe Olshansky <>, Ealan Henis
<>, and Anna Reitman <>.
* An asynchronous name lookup library was added. The interface is designed
after POSIX AIO. The proposal was circulated beforehand to get comments.
No negative ones came in. Implemented by Ulrich Drepper.
* Port to S390/64bit contributed by Martin Schwidefsky
* David Mosberger <> implemented the setcontext family
of functions for Linux/IA-64.
* The RPC code is now thread safe. Threads can now use the same service
of different services at the same time. Patch by Eric Norum
<> with some help by Ulrich Drepper.
* Martin Schwidefsky <> implemented the setcontext
family of functions for Linux/S390.
* Ulrich Drepper <> implemented the setcontext family
of functions for Linux/x86.
* Port to Linux/CRIS contributed by Axis Communications.
Version 2.2.2
* Lots of headers were cleaned up. Using the tool in the conform/ subdir
we can now check for namespace violations and missing declarations. The
result is that almost all headers are now Unix-compliant (as defined in
the upcoming XPG6). The negative side is that some programs might need
corrections, too, if they depend on the incorrect form of the headers in
previous versions which defined too many symbols and included too many
other headers.
* regex now handles multibyte character sets correctly.
Contributed by Isamu Hasegawa <>.
* iconv (the program) does now conform to the upcoming XPG6 and handles
charmaps. Instead of the charset names the path of charmaps can be
provided and the conversion happens based on this data.
Contributed by Ulrich Drepper.
* The locale program now provides detailed information about the installed
locales. While
locale -a
only lists the names of the supported locales
locale -a --verbose
provides details such as country, language, and codeset name.
Contributed by Ulrich Drepper.
Version 2.2.1
* The gencat program now parses the input file according to the charset
selected by the LC_CTYPE category. This is important for stateful
character sets. To make generating catalogs easier there is a way
to overwrite the charset selected by the locale: before the first
message or $ quote line the catalog can contain a line like
$ codeset=ISO-8859-2
to select the charset (ISO-8859-2 in this case).
Implemented by Shinya Hanataka and Ulrich Drepper.
* New codeset conversion modules: IBM-922 (Estonia PC codeset),
IBM-1124 (Ukraine PC codeset), IBM-1129 (Vietnamese PC codeset).
Contributed by Masahide Washizawa <>.
* Optimized string functions for Alpha ev6 and ev67 by Richard Henderson
<> and Rick Gorton <>.
* The LANGUAGE environment variable is now ignored unless the locale is
changed from the default "C" locale.
* The usual bug fixes.
Version 2.2
* Greg McGary added runtime support for bounds checking using gcc's
new -fbounded-pointers option. ix86 target is complete. PowerPC
is in progress.
* Thorsten Kukuk added secure mode support to nscd.
* The Berkeley db libraries have been removed.
Related, the nss_db module is now in a separate package since it
obviously requires a database library being available.
* Wide character I/O streams implemented by Ulrich Drepper.
* Functions from the extended socket API added by Ulrich Drepper.
* Functions feenableexcept and fedisableexcept to control the
behaviour of individual exceptions have been added by Andreas Jaeger.
* ldconfig program added by Andreas Jaeger and Jakub Jelinek.
* The resolver code has been updated from bind 8.2.3-T5B which supports
threads. The integration was done by Andreas Jaeger, Adam D. Bradley,
and Mark Kettenis.
This change could in some situations effect backward compatibility. Since
now `_res' is a thread-local instead of a global variable, modifying it
in one thread does not have any effect in other threads.
The resolver library was also extended to allow IPv6 as the transport
protocol for the requests. This work was done by Stig Venaas.
* Compatibility code for K&R C compilers has been removed from the
header files. A ISO C compiler is needed to use the library
(conforming to either C89 or C99 standard).
* Complete rewrite of the localedef program to support multibyte character
sets. Implement handling of ISO 14651 and ISO 14652. Rewrite strcoll,
strxfrm, wcscoll, and wcsxfrm functions. Make isw*() functions work.
Implemented by Ulrich Drepper.
Bruno Haible significantly improved the generation and use of the data
structures for the wide character tables.
* Plural handling in gettext implemented by Ulrich Drepper.
* The utmp daemon has been removed.
* The port to MIPS-Linux has been finished by Andreas Jaeger.
* A port to Hitachi SH3 and SH4 has been contributed by Kazumoto Kojima
and Yutaka Niibe.
* POSIX clocks and timers implemented by Kaz Kylheku and Ulrich Drepper.
* POSIX barriers implemented by Kaz Kylheku.
* POSIX spawn function family implemented by Ulrich Drepper.
* POSIX spinlocks are now available.
* Timed wait functions for mutex, rwlock, and semaphores are implemented.
* the configure option --enable-kernel=X.Y.Z allows to strip out
compatibility for kernel versions before X.Y.Z. This is currently only
implemented for Linux.
* the sockaddr_in6 structure changed. The IPv6 working group added a new
field sin6_scope_id. This means that all programs using IPv6 should be
recompiled. Don't expect binary compatibility with previous glibc
* various conversion modules for IBM character sets contributed by
Masahide Washizawa.
* IA-64 port by Jes Sorensen and HJ Lu.
Version 2.1.3
* bug fixes
Version 2.1.2
* bug fixes
Version 2.1.1
* New ISO C 9x function _Exit, imaxabs, and imaxdiv are added.
* New xdr functions are added; some rpc functions are now 64bit clean.
* Fixed a number of bugs and memory leaks (especially in NIS+ code).
* Fixed known incompatibilities with glibc 2.0.
* New functions lock64, strchrnul, rawmemchr, getutmp and getutmpx.
* Optimized a number of functions (especially the ELF dynamic loader).
* Update timezone data files.
* lots of charmaps corrections
* some new locale definitions and charmaps
Version 2.1
* Richard Henderson corrected size of struct timeval on Linux/Alpha to
conform to POSIX member type requirements. Symbol versions have been
adjusted as needed within the library, and for direct use by applications,
but there is potential for problems if third-party libraries use
struct timeval as part of their interface. This does not present
a problem for X and other "essential" system libraries.
* An additional locale model to support C++ Standard Library locale
model and probably more was implemented by Ulrich Drepper.
* Eric Youngdale and Ulrich Drepper implemented versioning of objects on
symbol level.
* Miles Bader provided the `argp' function family to support hierachical
command line argument parsing, layered on top of getopt.
* strtod accepts new hexadecimal floating-point format from ISO C 9X.
* printf has two new specifiers %a and %A to print hexadecimal flaoting-point
* scanf recognizes the %a and %A format for scanning floating point numbers.
* the new headers <stdint.h> and <inttypes.h> from ISO C 9X provides
information and interfaces for the available integer types.
* about 130 new math functions were added to implement the ISO C9x math
* the new header <complex.h> contains definitions of the complex math
functions from ISO C 9X.
* the new header <tgmath.h> defines generic macros to use complex or
real valued functions.
* Thorsten Kukuk provided an implementation for NIS+, securelevel 0, 1 and 2.
* Andreas Jaeger provided a test suite for the math library.
* Mark Kettenis implemented the utmpx interface and an utmp daemon.
* Ulrich Drepper added character set conversion functions (iconv).
* Optimized string functions have been added.
* The localedata addon is now part of glibc.
* An implementation of profiling shared libraries was added by Ulrich Drepper.
* Thorsten Kukuk and Ulrich Drepper provided an implementation for a caching
daemon for NSS (nscd).
Missing a better place here are some numbers on improvements. Under
Linux 2.1.125 un-tar-ing the kernel sources takes
user system wall
using local files 12.19s 6.88s 22.91s
using NIS 13.92s 8.91s 26.34s
using NIS & nscd 10.37s 7.34s 25.30s
using NIS+ 27.57s 30.37s 640.46s
using NIS+ & nscd 10.25s 7.83s 26.51s
using NIS & old nscd [1] 13.83s 8.32s 29.60s
Keep in mind that non-namelookup related operations dominate above times.
It was just a common complain that using NIS+ unpacking the kernel is
horribly slow.
[1] The old nscd implementation is not available anymore since it was
distributed with glibc up to version 2.0.98 and thus is now replaced.
* Tim Waugh provided an implementation of the POSIX.2 wordexp function family.
* Mark Kettenis provided a Hesiod NSS module.
* The ELF dynamic loader knows how to process dynamic string tokens ($ORIGIN
and $PLATFORM) in RPATHs and similar strings (Ulrich Drepper).
* rcmd can now handle netgroups (Dick Streefland).
* A port to the ARM was contributed by Phil Blundell, Pat Beirne and Scott
* Support for the IPv6 protocol has been added to the socket API, as per the
latest draft standards.
* Support for Linux 2.2 has been added.
* Interface changes relative to the latest 2.0.x release:
addseverity NEW: Unix98
alphasort64 NEW: LFS
argp_err_exit_status NEW: argp, GNU ext
argp_error NEW: argp, GNU ext
argp_failure NEW: argp, GNU ext
argp_help NEW: argp, GNU ext
argp_parse NEW: argp, GNU ext
argp_program_bug_address NEW: argp, GNU ext
argp_program_version NEW: argp, GNU ext
argp_program_version_hook NEW: argp, GNU ext
argp_state_help NEW: argp, GNU ext
argp_usage NEW: argp, GNU ext
authdes_create NEW: Secure RPC
authdes_getucred NEW: Secure RPC
authdes_pk_create NEW: Secure RPC
backtrace NEW: GNU ext.
backtrace_symbols NEW: GNU ext.
backtrace_symbols_fd NEW: GNU ext.
cacos NEW: ISO C 9x
cacosf NEW: ISO C 9x
cacosh NEW: ISO C 9x
cacoshf NEW: ISO C 9x
cacoshl NEW: ISO C 9x
cacosl NEW: ISO C 9x
capget NEW: kernel
capset NEW: kernel
carg NEW: ISO C 9x
cargf NEW: ISO C 9x
cargl NEW: ISO C 9x
casin NEW: ISO C 9x
casinf NEW: ISO C 9x
casinh NEW: ISO C 9x
casinhf NEW: ISO C 9x
casinhl NEW: ISO C 9x
casinl NEW: ISO C 9x
catan NEW: ISO C 9x
catanf NEW: ISO C 9x
catanh NEW: ISO C 9x
catanhf NEW: ISO C 9x
catanhl NEW: ISO C 9x
catanl NEW: ISO C 9x
cbc_crypt NEW: Secure RPC
ccos NEW: ISO C 9x
ccosf NEW: ISO C 9x
ccosh NEW: ISO C 9x
ccoshf NEW: ISO C 9x
ccoshl NEW: ISO C 9x
ccosl NEW: ISO C 9x
cexp NEW: ISO C 9x
cexpf NEW: ISO C 9x
cexpl NEW: ISO C 9x
cimag NEW: ISO C 9x
cimagf NEW: ISO C 9x
cimagl NEW: ISO C 9x
clearerr_locked REMOVED
clntunix_create NEW: sunrpc ext
clog NEW: ISO C 9x
clog10 NEW: ISO C 9x
clog10f NEW: ISO C 9x
clog10l NEW: ISO C 9x
clogf NEW: ISO C 9x
clogl NEW: ISO C 9x
conj NEW: ISO C 9x
conjf NEW: ISO C 9x
conjl NEW: ISO C 9x
cpow NEW: ISO C 9x
cpowf NEW: ISO C 9x
cpowl NEW: ISO C 9x
cproj NEW: ISO C 9x
cprojf NEW: ISO C 9x
cprojl NEW: ISO C 9x
creal NEW: ISO C 9x
crealf NEW: ISO C 9x
creall NEW: ISO C 9x
creat64 NEW: LFS
csin NEW: ISO C 9x
csinf NEW: ISO C 9x
csinh NEW: ISO C 9x
csinhf NEW: ISO C 9x
csinhl NEW: ISO C 9x
csinl NEW: ISO C 9x
csqrt NEW: ISO C 9x
csqrtf NEW: ISO C 9x
csqrtl NEW: ISO C 9x
ctan NEW: ISO C 9x
ctanf NEW: ISO C 9x
ctanh NEW: ISO C 9x
ctanhf NEW: ISO C 9x
ctanhl NEW: ISO C 9x
ctanl NEW: ISO C 9x
des_setparity NEW: Secure RPC
ecb_crypt NEW: Secure RPC
endutxent NEW: Unix98
exp10 NEW: ISO C 9x
exp10f NEW: ISO C 9x
exp10l NEW: ISO C 9x
exp2 NEW: ISO C 9x
exp2f NEW: ISO C 9x
exp2l NEW: ISO C 9x
fattach NEW: STREAMS
fdetach NEW: STREAMS
fdim NEW: ISO C 9x
fdimf NEW: ISO C 9x
fdiml NEW: ISO C 9x
feclearexcept NEW: ISO C 9x
fegetenv NEW: ISO C 9x
fegetexceptflag NEW: ISO C 9x
fegetround NEW: ISO C 9x
feholdexcept NEW: ISO C 9x
feof_locked REMOVED
feraiseexcept NEW: ISO C 9x
ferror_locked REMOVED
fesetenv NEW: ISO C 9x
fesetexceptflag NEW: ISO C 9x
fesetround NEW: ISO C 9x
fetestexcept NEW: ISO C 9x
feupdateenv NEW: ISO C 9x
fflush_locked REMOVED
ffsl NEW: GNU ext.
ffsll NEW: GNU ext.
fgetpos64 NEW: LFS
fgets_unlocked NEW: GNU ext.
fileno_locked REMOVED
fma NEW: ISO C 9x
fmaf NEW: ISO C 9x
fmal NEW: ISO C 9x
fmax NEW: ISO C 9x
fmaxf NEW: ISO C 9x
fmaxl NEW: ISO C 9x
fmin NEW: ISO C 9x
fminf NEW: ISO C 9x
fminl NEW: ISO C 9x
fmtmsg NEW: Unix98
fopen64 NEW: LFS
fputc_locked REMOVED
fputs_unlocked NEW: GNU ext.
fread_unlocked NEW: GNU ext.
freopen64 NEW: LFS
fseeko NEW: Unix98
fsetpos64 NEW: LFS
fstatfs64 NEW: LFS
fstatvfs NEW: Unix98
fstatvfs64 NEW: LFS
ftello NEW: Unix98
ftello64 NEW: LFS
ftruncate64 NEW: LFS
ftw64 NEW: LFS
fwrite_unlocked NEW: GNU ext.
gai_strerror NEW: IPv6
gamma_r REMOVED
gammaf_r REMOVED
gammal_r REMOVED
getchar_locked REMOVED
getdate NEW: Unix98
getdate_err NEW: Unix98
getdate_r NEW: GNU ext.
getnameinfo NEW: IPv6
getnetname NEW: Secure RPC
getpmsg NEW: STREAMS
getpt NEW: Unix98 PTY
getrlimit64 NEW: LFS
getutxent NEW: Unix98
getutxid NEW: Unix98
getutxline NEW: Unix98
glob64 NEW: GNU ext.
globfree64 NEW: GNU ext.
gnu_get_libc_release NEW: GNU ext.
gnu_get_libc_version NEW: GNU ext.
grantpt NEW: Unix98 PTY
host2netname NEW: Secure RPC
iconv NEW: iconv
iconv_close NEW: iconv
iconv_open NEW: iconv
if_freenameindex NEW: IPv6
if_indextoname NEW: IPv6
if_nameindex NEW: IPv6
if_nametoindex NEW: IPv6
in6addr_any NEW: IPv6
in6addr_loopback NEW: IPv6
inet6_isipv4mapped NEW: IPv6
isastream NEW: STREAMS
iswblank NEW: GNU ext.
key_decryptsession NEW: Secure RPC
key_decryptsession_pk NEW: Secure RPC
key_encryptsession NEW: Secure RPC
key_encryptsession_pk NEW: Secure RPC
key_gendes NEW: Secure RPC
key_get_conv NEW: Secure RPC
key_secretkey_is_set NEW: Secure RPC
key_setnet NEW: Secure RPC
key_setsecret NEW: Secure RPC
llrint NEW: ISO C 9x
llrintf NEW: ISO C 9x
llrintl NEW: ISO C 9x
llround NEW: ISO C 9x
llroundf NEW: ISO C 9x
llroundl NEW: ISO C 9x
log2 NEW: ISO C 9x
log2f NEW: ISO C 9x
log2l NEW: ISO C 9x
lrint NEW: ISO C 9x
lrintf NEW: ISO C 9x
lrintl NEW: ISO C 9x
lround NEW: ISO C 9x
lroundf NEW: ISO C 9x
lroundl NEW: ISO C 9x
lseek64 NEW: LFS
makecontext NEW: Unix98
mempcpy NEW: GNU ext.
mmap64 NEW: LFS
moncontrol REMOVED
modify_ldt NEW: kernel
nan NEW: ISO C 9x
nanf NEW: ISO C 9x
nanl NEW: ISO C 9x
nearbyint NEW: ISO C 9x
nearbyintf NEW: ISO C 9x
nearbyintl NEW: ISO C 9x
netname2host NEW: Secure RPC
netname2user NEW: Secure RPC
nexttoward NEW: ISO C 9x
nexttowardf NEW: ISO C 9x
nexttowardl NEW: ISO C 9x
nftw NEW: Unix98
nftw64 NEW: LFS
open64 NEW: LFS
passwd2des NEW: Secure RPC
pow10 NEW: GNU ext.
pow10f NEW: GNU ext.
pow10l NEW: GNU ext.
pread NEW: Unix98
pread64 NEW: LFS
printf_size NEW: GNU ext.
printf_size_info NEW: GNU ext.
profil_counter REMOVED
pthread_mutexattr_getkind_np REPLACED
pthread_mutexattr_setkind_np REPLACED
ptsname NEW: Unix98 PTY
ptsname_r NEW: Unix98 PTY
putc_locked REMOVED
putchar_locked REMOVED
putgrent NEW: GNU ext.
putpmsg NEW: STREAMS
pututxline NEW: Unix98
pwrite NEW: Unix98
pwrite64 NEW: LFS
readdir64 NEW: LFS
readdir64_r NEW: LFS
remquo NEW: ISO C 9x
remquof NEW: ISO C 9x
remquol NEW: ISO C 9x
round NEW: ISO C 9x
roundf NEW: ISO C 9x
roundl NEW: ISO C 9x
rtime NEW: GNU ext.
scalbln NEW: ISO C 9x
scalblnf NEW: ISO C 9x
scalblnl NEW: ISO C 9x
scandir64 NEW: LFS
sendfile NEW: kernel
setcontext NEW: Unix98
setrlimit64 NEW: LFS
setutxent NEW: Unix98
sighold NEW: Unix98
sigignore NEW: Unix98
sigqueue NEW: POSIX.1b
sigrelse NEW: Unix98
sigset NEW: POSIX.1b
sigtimedwait NEW: POSIX.1b
sigwaitinfo NEW: POSIX.1b
sincos NEW: GNU ext.
sincosf NEW: GNU ext.
sincosl NEW: GNU ext.
statfs64 NEW: LFS
statvfs NEW: Unix98
statvfs64 NEW: LFS
strcasestr NEW: GNU ext.
strtoimax NEW: ISO C 9x
strtoumax NEW: ISO C 9x
strverscmp NEW: GNU ext.
svcauthdes_stats NEW: Secure RPC
svcunix_create NEW: sunrpc etx
svcunixfd_create NEW: sunrpc ext
swapcontext NEW: Unix98
tcgetsid NEW: Unix98 PTY
tdestroy NEW: GNU ext.
tgamma NEW: ISO C 9x
tgammaf NEW: ISO C 9x
tgammal NEW: ISO C 9x
tmpfile64 NEW: LFS
trunc NEW: ISO C 9x
truncate64 NEW: LFS
truncf NEW: ISO C 9x
truncl NEW: ISO C 9x
umount2 NEW: kernel
unlockpt NEW: Unix98 PTY
updwtmpx NEW: Unix98
user2netname NEW: Secure RPC
utmpxname NEW: Unix98
versionsort NEW: GNU ext.
versionsort64 NEW: GNU ext.
waitid NEW: Unix98
wcscasecmp NEW: GNU ext.
wcsncasecmp NEW: GNU ext.
wcsnlen NEW: GNU ext.
wcstoimax NEW: ISO C 9x
wcstoll NEW: ISO C 9x
wcstoull NEW: ISO C 9x
wcstoumax NEW: ISO C 9x
wcswcs NEW: Unix98
wordexp NEW: POSIX.2
wordfree NEW: POSIX.2
write_profiling REMOVED
xdecrypt NEW: Secure RPC
xdr_authdes_cred NEW: Secure RPC
xdr_authdes_verf NEW: Secure RPC
xdr_cryptkeyarg NEW: Secure RPC
xdr_cryptkeyarg2 NEW: Secure RPC
xdr_cryptkeyres NEW: Secure RPC
xdr_getcredres NEW: Secure RPC
xdr_key_netstarg NEW: Secure RPC
xdr_key_netstres NEW: Secure RPC
xdr_keybuf NEW: Secure RPC
xdr_keystatus NEW: Secure RPC
xdr_netnamestr NEW: Secure RPC
xdr_sizeof NEW: Secure RPC
xdr_unixcred NEW: sunrpc ext
xencrypt NEW: Secure RPC
Version 2.0.6
* more bug fixes
Version 2.0.5
* more bug fixes
* inet_ntoa is thread-safe
* updwtmp is moved from libutil to libc
* rewrite of cbrt function
* update of timezone data
Version 2.0.4
* more bug fixes
Version 2.0.3
* more bug fixes
Version 2.0.2
* more bug fixes
* add atoll function
* fix complex problems in Berkeley DB code
* fix math functions
Version 2.0.1
* fixed lots of header problems (especially Linux/GNU specific)
* dynamic loader preserves all registers
* Roland McGrath provided support for handling of auxiliary objects in
the ELF dynamic loader.
* support for parallel builds is improved
Version 2.0
* GNU extensions are no longer declared by default. To enable them you
must define the macro `_GNU_SOURCE' in your program or compile with
* The library has changed from using GNU ld symbol aliases to using weak
symbols where available. The ELF object file format supports weak
symbols; GNU ld also supports weak symbols in the a.out format. (There
is also now support for other GNU ld extensions in ELF. Use the
`--with-elf' option to configure to indicate you have ELF, and
`--with-gnu-ld' if using GNU ld.) This change resulted in the deletion
of many files which contained only symbol aliases, reducing the size of
the source and the compiled library; many other files were renamed to
less cryptic names previously occupied by the symbol alias files.
There is a new header file <elf.h> for programs which operate on
files in the ELF format.
* Converted to Autoconf version 2, so `configure' has more options.
Run `configure --help' to see the details.
* The library can now be configured to build profiling, highly-optimized
(but undebuggable), and/or shared libraries (ELF with GNU ld only). The
`--enable-profile', `--enable-omitfp', and `--enable-shared' options to
`configure' enable building these extra libraries. The shared library is
built by default when using both ELF and GNU ld. When shared libraries
are enabled, the new library `-ldl' is available for arbitrary run-time
loading of shared objects; its interface is defined in <dlfcn.h>. The
new header file <link.h> gives access to the internals of the run-time
dynamic linker, `'. The shell script `ldd' is similar to the
application of same name on other systems and it provides information
about dynamically linked binaries.
* The C library now provides the run-time support code for profiling
executables compiled with `-pg'. Programs can control the profiling code
through the interface in <sys/gmon.h>. The `gmon.out' files written by
the GNU C library can be read only by GNU `gprof' (from GNU binutils);
the support for this file format was contributed by David Mosberger-Tang.
* The math code has been replaced with a math library based on fdlibm from
Sun, and modified by JT Conklin and Ulrich Drepper with i387 support, by
Ian Taylor with `float' functions and by Ulrich Drepper with `long double'
functions. The math functions now reside in a separate library, so
programs using them will need to use `-lm' their linking commands.
* John C. Bowman contributed optimized ix87 assembler inline functions.
* Ulrich Drepper has contributed support for an `/etc/nsswitch.conf'
mechanism similar to that found in Solaris 2. This is now used for the
group, passwd, hosts, networks, services, protocols, rpc, ethers,
shadow, netgroup, publickey, and alias databases. The `nsswitch.conf'
file controls what services are used for each individual database. This
works by loading shared libraries with names specified in `nsswitch.conf',
so service modules can be changed or added at any time without even
relinking any program. Currently there are the file, db, and NIS based
NSS services available.
* The new functions `strtoq' and `strtouq' parse integer values from
strings, like `strtol' and `strtoul', but they return `long long int' and
`unsigned long long int' values, respectively (64-bit quantities).
* The new functions `strtof' and `strtold' parse floating-point values from
strings, like `strtod', but they return `float' and `long double' values,
respectively (on some machines `double' and `long double' are the same).
* Ulrich Drepper has contributed new implementations of the floating-point
printing and reading code used in the `printf' family of functions and
`strtod', `strtof', and `strtold'. These new functions are perfectly
accurate, and much faster than the old ones.
* The implementation of the POSIX locale model was completely rewritten by
Ulrich Drepper. This includes the new programs `localedef' and `locale'
to compile the POSIX locale definition.
* The former dummy implementations of the strcoll and strxfrm function are
now replaced by fully functional code contributed by Ulrich Drepper. The
collation information comes from the POSIX locale definitions.
* The new header <langinfo.h> defines an interface for accessing
various locale-dependent data (using the locale chosen with `setlocale').
* Ulrich Drepper has contributed a new suite of functions for operation on
wide-character and multibyte-character strings, in <wchar.h>;
and classification and case conversion of wide characters, in <wctype.h>.
These new functions are conforming to the ISO C, Amendement 1 specification.
* There is now a second implementation of the standard I/O library available.
It comes from GNU libg++ as was written by Per Bothner, heavily modified
by Hongjiu Lu and made thread safe by Ulrich Drepper.
* You can now use positional parameter specifications in format strings
for the `printf' and `scanf' families of functions. For example,
`printf ("Number %2$d, Mr %1$s\n", "Jones", 6);'' prints
``Number 6, Mr Jones''. This is mainly useful when providing different
format strings for different languages, whose grammars may dictate
different orderings of the values being printed. To support this
feature, the interface for `register_printf_handler' has changed; see
the header file <printf.h> for details.
* The `printf' and `scanf' families of functions now understand a new
formatting flag for numeric conversions: the ' flag (e.g. %'d or %'f) says
to group numbers as indicated by the locale; for `scanf' and friends, this
says to accept as valid only a number with all the proper grouping
separators in the right places. In the default "C" locale, numbers are
not grouped; but locales for specific countries will define the usual
conventions (i.e. separate thousands with `,' in the US locale).
* The pgrp functions have been regularized, slightly incompatibly but much
less confusingly. The core functions are now `getpgid' and `setpgid',
which take arguments for the PID to operate on; the POSIX.1 `getpgrp' (no
argument) and BSD `setpgrp' (identical to `setpgid') functions are
provided for compatibility. There is no longer an incompatible `getpgrp'
with an argument declared under _BSD_SOURCE; no BSD code uses it.
* The new header file <fts.h> and suite of functions simplify programs that
operate on directory trees. This code comes from 4.4 BSD.
* The resolver code has been updated from the BIND 4.9.5-P1 release.
Parts of the code were heavily modified by Ulrich Drepper to fit in the
NSS scheme used in glibc.
* There is a new malloc debugging hook `__memalign_hook'.
* There are new typedefs `ushort' for `unsigned short int' and `uint' for
`unsigned int' in <sys/types.h>. These are for compatibility only and
their use is discouraged.
* The `-lmcheck' library to enable standard malloc debugging hooks is now
done differently, so that it works even without GNU ld.
* New function `euidaccess' checks allowed access to a file like `access',
but using the effective IDs instead of the real IDs.
* The time zone data files have been updated for the latest and greatest
local time conventions of the countries of the world.
* The new function `dirfd' extracts the file descriptor used by a DIR stream;
see <dirent.h>.
* The new functions `ecvt', `fcvt', and `gcvt' provide an obsolete interface
for formatting floating-point numbers. They are provided only for
compatibility; new programs should use `sprintf' instead. There are
also equivalent function for the `long double' floating-point type and
all functions also exist in a reentrant form.
* The new auxiliary library `-lutil' from 4.4 BSD contains various
functions for maintaining the login-record files (primarily of use to
system programs such as `login'), and convenient functions for
allocating and initializing a pseudo-terminal (pty) device.
* Ulrich Drepper has contributed new support for System V style
shared memory and IPC on systems that support it.
* Ulrich Drepper has contributed several miscellaneous new functions found
in System V: The `hsearch' family of functions provide an effective
implementation of hash tables; `a64l' and `l64a' provide a very simple
binary to ASCII mapping; `drand48' and friends provide a 48-bit random
number generator.
* Ulrich Drepper has contributed new reentrant counterparts for the
`random' and `hsearch' families of functions; `random_r', `hsearch_r', etc.
* Ulrich Drepper has contributed new, highly-optimized versions of several
string functions for the i486/Pentium family of processors.
* Ulrich Drepper has updated the Linux-specific code, based largely
on work done in Hongjiu Lu's version of GNU libc for Linux.
The GNU library now supports Linux versions 2.0.10 and later,
using the ELF object file format (i[3456]86-*-linux).
* Andreas Schwab has ported the C library to Linux/m68k (m68k-*-linux).
* David Mosberger-Tang and Richard Henderson have ported the C library
to Linux/Alpha (alpha-*-linux). Richard Henderson contributed the
dynamic linking support for ELF/Alpha.
* Richard Henderson contributed several Alpha optimized assembler function
for arithmetic and string handling.
* Ulrich Drepper has contributed a new set of message catalog functions to
support multiple languages using the <libintl.h> interface, for use with
his new package GNU gettext. Translation volunteers have contributed
catalogs of the library's messages in Spanish, German, and Korean.
* For compatibility with XPG4, Ulrich Drepper has contributed the `gencat'
program and the `catgets' function for reading the catalog files it
creates. (The <libintl.h> interface is preferred; we include the
<nl_types.h> interface using `catgets' only for source compatibility with
programs already written to use it.)
* New header file <values.h> gives SVID-compatible names for <limits.h>
* Various new macros, declarations, and small header files for compatibility
with 4.4 BSD.
* New function `group_member' is a convenient way to check if a process has
a given effective group ID.
* When using GCC 2.7 and later, the socket functions are now declared in a
special way so that passing an argument of type `struct sockaddr_in *',
`struct sockaddr_ns *', or `struct sockaddr_un *' instead of the generic
`struct sockaddr *' type, does not generate a type-clash warning.
* New function `error' declared in header file <error.h> is a convenient
function for printing error messages and optionally exiting; this is the
canonical function used in GNU programs. The new functions `err', `warn',
and friends in header file <err.h> are the canonical 4.4 BSD interface for
doing the same thing.
* The <glob.h> interface has several new flags from 4.4 BSD that extend the
POSIX.2 `glob' function to do ~ and {...} expansion.
* New function `unsetenv' complements `setenv' for compatibility with 4.4 BSD.
`clearenv' which is used in POSIX.9 is also available.
* New function `getsid' returns session ID number on systems that support it.
* We have incorporated the 4.4 BSD `db' library (version 1.85). New header
files <db.h> and <mpool.h> provide a rich set of functions for several
types of simple databases stored in memory and in files, and <ndbm.h> is
an old `ndbm'-compatible interface using the `db' functions. Link with
`-ldb' to get these functions.
* New macro `strdupa' copies a string like `strdup', but uses local stack
space from `alloca' instead of dynamic heap space from `malloc'.
* New function `strnlen' is like `strlen' but searches only a given maximum
number of characters for the null terminator. `stpncpy', `strndup' and
`strndupa' are similar variants for the `stpcpy', `strdup' and `strdupa'
* New function `statfs' in header <sys/statfs.h>.
* The new <argz.h> and <envz.h> interfaces contributed by Miles Bader
provide convenient functions for operating on blocks of null-terminated
* A new suite of functions in <utmp.h> handle all the details of reading
and writing the utmp file.
* An implementation of the NIS/YP(tm) based NSS service was contributed by
Thorsten Kukuk.
* Paul Eggert and Ulrich Drepper modified the `strftime' function to be
completely POSIX compliant and also implemented the extended functionality
to handle alternate digit representation and alternate era date formats.
* Ulrich Drepper provided an implementation of the `strptime' function
defined in XPG4.2 which transforms a string into a `struct tm' value.
* Paul Eggert provided the tzselect shell script as part of the timezone
code. The shell script makes it easy to select the correct timezone
* The implementation of the malloc family of functions is completely replaced
by a new implementation by Doug Lea with many improvements by Wolfram Gloger.
The implementation uses the mmap function (if available) and it is
optimized for the use in multi threaded programs.
* Ulrich Drepper contributed a MD5 "encryption" for the crypt family of
functions. This new functionality is usable by specifying a special
salt string and it is compatible with implementation on *BSD systems.
* Lots of functions from the XPG4.2 standard were added by Ulrich Drepper:
`getsubopt' to handle second level command line options, `bsd_signal'
to access BSD style `signal' functionality, the obsolete `regexp' style
expression matcher.
* the `lchown' function is available on system which support this
* The implementation of the shadow password handling function was contributed
by Ulrich Drepper.
* David Mosberger-Tang changed the SunRPC implementation to be 64bit safe.
* POSIX.1g support was added. The <sys/select.h> header is available,
`isfdtype' and `pselect' are implemented. Craig Metz contributed an
implementation of `getaddrinfo'.
Version 1.09
* For cross-compilation you should now set `BUILD_CC' instead of `HOST_CC'.
* New header file <fstab.h> and new functions `getfsspec', `getfsent' and
friends, for parsing /etc/fstab. This code comes from 4.4 BSD.
* The new function `daemon' from 4.4 BSD is useful for server programs that
want to put themselves in the background.
* Joel Sherrill has contributed support for several standalone boards that
run without an operating system.
* `printf', `scanf' and friends now accept a `q' type modifier for long
long int as well as `ll'. Formats using these might be `%qu' or `%lld'.
* All of the code taken from BSD (notably most of the math and networking
routines) has been updated from the BSD 4.4-Lite release.
* The resolver code has been updated from the BIND-4.9.3-BETA9 release.
* The new functions `getdomainname' and `setdomainname' fetch or change the
YP/NIS domain name. These are system calls which exist on systems which
have YP (aka NIS).
* The time zone data files have been updated for the latest international
* The SunRPC programs `portmap' and `rpcinfo' are now installed in
$(sbindir) (usually /usr/local/sbin) instead of $(bindir).
Version 1.08
* The C library now includes support for Sun RPC, from Sun's free
RPCSRC-4.0 distribution. The `portmap', `rpcinfo', and `rpcgen' programs
are included. (There is still no support for YP.)
* Tom Quinn has contributed a port of the C library to SGI machines running
Irix 4 (mips-sgi-irix4).
* The new `lockf' function is a simplified interface to the locking
facilities of `fcntl', included for compatibility.
* New time functions `timegm', `timelocal', and `dysize' for compatibility.
* New header file <sys/timeb.h> and new function `ftime' for compatibility.
* New header files <poll.h> and <sys/poll.h> and new function `poll' for
* The error message printed by `assert' for a failed assertion now includes
the name of the program (if using GNU ld) and the name of the calling
function (with versions of GCC that support this).
* The `psignal' function is now declared in <signal.h>, not <stdio.h>.
* The library now includes the <sys/mman.h> header file and memory
management functions `mmap', `munmap', `mprotect', `msync', and
`madvise', on systems that support those facilities.
* The interface for `mcheck' has changed slightly: the function called to
abort the program when an allocation inconsistency is detected now takes
an argument that indicates the type of failure. The new function
`mprobe' lets you request a consistency check for a particular block at
any time (checks are normally done only when you call `free' or `realloc'
on a block).
* It is now possible to easily cross-compile the C library, building on one
system a library to run on another machine and/or operating system. All
you need to do is set the variable `HOST_CC' in `configparms' to the
native compiler for programs to run on the machine you are building on (a
few generator programs are used on Unix systems); set `CC' to the
* The new function `fexecve' (only implemented on the GNU system) executes
a program file given a file descriptor already open on the file.
Version 1.07
* Brendan Kehoe has contributed most of a port to the DEC Alpha
running OSF/1 (alpha-dec-osf1). He says it is 75% complete.
* You can set the variable `libprefix' in `configparms' to specify a prefix
to be prepended to installed library files; this makes it easy to install
the GNU C library to be linked as `-lgnuc' or whatever.
* The new `stpncpy' is a cross between `stpcpy' and `strncpy': It
copies a limited number of characters from a string, and returns the
address of the last character written.
* You no longer need to check for whether the installed `stddef.h' is
compatible with the GNU C library. configure now checks for you.
* You can now define a per-stream `fileno' function to convert the
stream's cookie into an integral file descriptor.
* ``malloc (0)'' no longer returns a null pointer. Instead, it
allocates zero bytes of storage, and returns a unique pointer which
you can pass to `realloc' or `free'. The behavior is undefined if
you dereference this pointer.
* The C library now runs on Sony NEWS m68k machines running either
NewsOS 3 or NewsOS 4.
* The new `syscall' function is a system-dependent primitive function
for invoking system calls. It has the canonical behavior on Unix
systems, including unreliable return values for some calls (such as
`pipe', `fork' and `getppid').
* The error code `EWOULDBLOCK' is now obsolete; it is always defined
to `EAGAIN', which is the preferred name. On systems whose kernels
use two distinct codes, the C library now translates EWOULDBLOCK to
EAGAIN in every system call function.
Version 1.06
* The GNU C Library Reference Manual is now distributed with the library.
`make dvi' will produce a DVI file of the printed manual.
`make info' will produce Info files that you can read on line using C-h i
in Emacs or the `info' program.
Please send comments on the manual to
* The library now supports SVR4 on i386s (i386-unknown-sysv4).
* Brendan Kehoe has contributed a port to Sun SPARCs running Solaris 2.
* Jason Merrill has contributed a port to the Sequent Symmetry running
Dynix version 3 (i386-sequent-dynix).
* The library has been ported to i386s running SCO 3.2.4 (also known as SCO
ODT 2.0; i386-unknown-sco3.2.4) or SCO 3.2 (i386-unknown-sco3.2).
* New function `memory_warnings' lets you arrange to get warnings when
malloc is running out of memory to allocate, like Emacs gives you.
* The C library now contains the relocating allocator used in Emacs 19 for
its editing buffers. This allocator (ralloc) minimizes allocation
overhead and fragmentation by moving allocated regions around whenever it
needs to. You always refer to a ralloc'd region with a "handle" (a
pointer to a pointer--an object of type `void **').
* There is a new `printf' format: `%m' gives you the string corresponding
to the error code in `errno'.
* In `scanf' formats, you can now use `%as' or `%a[' to do the normal `%s'
or `%[' conversion, but instead of filling in a fixed-sized buffer you
pass, the `a' modifier says to fill in a `char **' you pass with a
malloc'd string.
* The `fnmatch' function supports the new flag bits `FNM_LEADING_DIR' and
`FNM_CASEFOLD'. `FNM_LEADING_DIR' lets a pattern like `foo*' match a
name like `foo/bar'. `FNM_CASEFOLD' says to ignore case in matching.
* `mkstemp' is a traditional Unix function to atomically create and open a
uniquely-named temporary file.
Version 1.05
* The standard location for the file that says what the local timezone is
has changed again. It is now `/usr/local/etc/localtime' (or more
precisely, `${prefix}/etc/localtime') rather than `/etc/localtime'.
* The distribution no longer contains any files with names longer than 14
* `struct ttyent' has two new flag bits: TTY_TRUSTED and TTY_CONSOLE.
These are set by the new `trusted' and `console' keywords in `/etc/ttys'.
* New functions `ttyslot' and `syslog' from 4.4 BSD.
Version 1.04
* The configuration process has changed quite a bit. The `configure'
script is now used just like the configuration scripts for other GNU
packages. The `sysdeps' directory hierarchy is much rearranged.
The file `INSTALL' explains the new scheme in detail.
* The header files no longer need to be processed into ANSI C and
traditional C versions. There is just one set of files to install, and
it will work with ANSI or old C compilers (including `gcc -traditional').
* Brendan Kehoe and Ian Lance Taylor have ported the library to the
MIPS DECStation running Ultrix 4.
* The Sun 4 startup code (crt0) can now properly load SunOS 4 shared libraries.
Tom Quinn contributed the initial code. The GNU C library can NOT yet be
made itself into a shared library.
* Yet further improved support for the i386, running 4.3 BSD-like systems
(such as Mach 3 with the Unix single-server), or System V.
* New function `strncasecmp' to do case-insensitive string comparison
with limited length.
* New function `strsep' is a reentrant alternative to `strtok'.
* New functions `scandir' and `alphasort' for searching directories.
* New function `setenv' is a better interface to `putenv'.
* Ian Lance Taylor has contributed an implementation of the SVID `ftw'
function for traversing a directory tree.
* The GNU obstack package is now also part of the C library.
The new function `open_obstack_stream' creates a stdio stream that
writes onto an obstack; `obstack_printf' and `obstack_vprintf' do
formatted output directly to an obstack.
* Miscellaneous new functions: reboot, nice, sigaltstack (4.4 BSD only),
cfmakeraw, getusershell, getpass, swab, getttyent, seteuid, setegid.
* `FNM_FILE_NAME' is another name for `FNM_PATHNAME', used with `fnmatch'.
* The new functions `strfry' and `memfrob' do mysterious and wonderful
things to your strings.
* There are some new test programs: test-fseek, testmb, and testrand.
* Some work has been done to begin porting the library to 4.4 BSD and Linux.
These ports are not finished, but are a good starting place for really
supporting those systems.
* `/etc/localtime' is now the standard location for the file that says what
the local timezone is, rather than `/usr/local/lib/zoneinfo/localtime'.
This follows the general principle that `/etc' is the place for all local
configuration files.
* The C library header files now use `extern "C"' when used by the C++
compiler, so the C library should now work with C++ code.
* The header file <bstring.h> is gone. <string.h> now declares bcopy,
bcmp, bzero, and ffs. (Update: nowadays these functions are declared
in <strings.h>.)
* Mike Haertel (of GNU e?grep and malloc fame) has written a new sorting
function which uses the `merge sort' algorithm, and is said to be
significantly faster than the old GNU `qsort' function. Merge sort is
now the standard `qsort' function. The new algorithm can require a lot
of temporary storage; so, the old sorting function is called when the
required storage is not available.
* The C library now includes Michael Glad's Ultra Fast Crypt, which
provides the Unix `crypt' function, plus some other entry points.
* The code and header files taken from 4.4 BSD have been updated with the
latest files released from Berkeley.
Copyright information:
Copyright (C) 1992-2014 Free Software Foundation, Inc.
Permission is granted to anyone to make or distribute verbatim copies
of this document as received, in any medium, provided that the
copyright notice and this permission notice are preserved,
thus giving the recipient permission to redistribute in turn.
Permission is granted to distribute modified versions
of this document, or of portions of it,
under the above conditions, provided also that they
carry prominent notices stating who last changed them.
Local variables:
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