1 GNU C Library NEWS -- history of user-visible changes. 2010-4-7
2 Copyright (C) 1992-2009, 2010 Free Software Foundation, Inc.
3 See the end for copying conditions.
5 Please send GNU C library bug reports via <http://sources.redhat.com/bugzilla/>
6 using `glibc' in the "product" field.
10 * New Linux interface: recvmmsg
12 * New NIS mode selector ADJUNCT_AS_SHADOW. The passwd.adjunct.byname table
13 will not be used to fill in password fields in the passwd.byname replies.
14 Instead it is used to synthesize the shadow.byname table, should it be
15 missing. This is a useful mode in some installations involving Solaris.
16 Implemented by Ulrich Drepper.
21 * New interfaces: execvpe, pthread_sigqueue, mkstemps, mkstemps64, mkostemps,
23 Implemented by Ulrich Drepper.
25 * Checking version of longjmp added that fails if an uninitialized stack
26 frame would be created. Implemented by Ulrich Drepper.
28 * STT_GNU_IFUNC is now supported in static executables.
29 Implemented by H.J. Lu.
31 * STT_GNU_IFUNC implemented for PPC by Alan Modra.
33 * New optimized string functions for x86-64: strstr, strcasestr, memcmp,
34 strcspn, strpbrk, strspn, strcpy, stpcpy, strncpy, strcmp (SSE2, SSE4.2),
35 strncmp (SSE2, SSE4.2), strchr (SSE4.2), strrchr (SSE4.2).
36 Contributed by H.J. Lu.
38 strlen, rawmemchr, strcmp (SSSE3), strncmp (SSSE3).
39 Implemented by Ulrich Drepper.
41 * New optimized string functions for x86: strlen, strcspn, strspn, strpbrk,
43 Contributed by H.J. Lu.
45 * Support for fma instruction in AVX on x86-64.
46 Implemented by H.J. Lu and Ulrich Drepper.
48 * AVX support in x86-64 auditing support in ld.so.
49 Implemented by H.J. Lu.
51 * STB_GNU_UNIQUE support added.
52 Implemented by Ulrich Drepper.
54 * Implement second fallback mode for optimized DNS lookup for even more
55 broken environments. If two requests from the same port are not
56 handled correctly close the socket and open a new one before sending
57 the second request. The 'single-request-reopen' option in /etc/resolv.conf
58 can be used to select this mode right away, instead of rediscovering the
59 necessity is every process again.
60 Implemented by Ulrich Drepper.
62 * New resolver flag RES_USE_DNSSEC to enable use of verified lookup.
63 Implemented by Adam Tkac.
65 * Optimized iconv conversions for S390x.
66 Implemented by Andreas Krebbel.
68 * Using condvars with PI mutexes is now more efficient due to kernel
69 support for requeueing to PI futexes. NPTL support added for x86-64.
70 Implemented by Ulrich Drepper.
72 * New locales: ps_AF, my_MM
77 * New interfaces: preadv, preadv64, pwritev, pwritev64, malloc_info
78 Implemented by Ulrich Drepper.
80 * New Linux interfaces: accept4, fallocate, fallocate64.
81 Implemented by Ulrich Drepper.
83 * Correct declarations of string function when used in C++ code. This
84 could lead to compile errors for invalid C++ code.
86 * XPG7/POSIX 2008 compilation environment. Many GNU-specific functions are
89 * New POSIX 2008 interface: psiginfo
90 Implemented by Ulrich Drepper.
92 * New ISO C++1x interfaces: quick_exit, at_quick_exit
93 Implemented by Ulrich Drepper.
95 * Support for selecting between multiple function definitions at runtime
96 using STT_GNU_IFUNC symbols. Implemented by Ulrich Drepper.
98 * The libcrypt library can now use the hash function implementations in
99 NSS. Implemented by Ulrich Drepper.
101 * The malloc implementation can be compiled to be less memory efficient
102 but higher performing in multi-threaded programs.
103 Implemented by Ulrich Drepper.
105 * New locales: nan_TW@latin, ks_IN
107 * Faster strlen, strchr, strchrnul, strrchr, memchr, and rawmemchr for x86-64.
108 Implemented by Ulrich Drepper.
110 * Extended printf hook support. It is possible to use user-defined types
111 and extend existing format specifiers.
112 Implemented by Ulrich Drepper.
114 * Handling for group shadow files has been added.
115 Implemented by Ulrich Drepper.
117 * DNS IPv4-IPv6 parallel lookup now deals better with broken DNS
118 servers (the case, e.g., for some people using the built-in DNS
119 server in ADSL modems/routers). There is a once-per-process timeout
120 in case of a broken server. To avoid it, users can run nscd or put
121 'options single-request' in /etc/resolv.conf.
122 Implemented by Ulrich Drepper.
127 * Unified lookup for getaddrinfo: IPv4 and IPv6 addresses are now looked
128 up at the same time. Implemented by Ulrich Drepper.
130 * TLS descriptors for LD and GD on x86 and x86-64.
131 Implemented by Alexandre Oliva.
133 * getaddrinfo now handles DCCP and UDPlite.
134 Implemented by Ulrich Drepper.
136 * New fixed-size conversion macros: htobe16, htole16, be16toh, le16toh,
137 htobe32, htole32, be32toh, le32toh, htobe64, htole64, be64toh, le64toh.
138 Implemented by Ulrich Drepper.
140 * New implementation of memmem, strstr, and strcasestr which is O(n).
141 Implemented by Eric Blake.
143 * New Linux interfaces: inotify_init1, dup3, epoll_create1, pipe2
145 * Implement "e" option for popen to open file descriptor with the
146 close-on-exec flag set. Implemented by Ulrich Drepper.
148 * Implement "b" mode for fmemopen. In this mode writes writes don't
149 implicitly add a NUL byte and seeks from the end of the buffer really
150 use the buffer end, not the string length as the basis.
151 Implemented by Ulrich Drepper.
153 * Many functions, exported and internal, now atomically set the close-on-exec
154 flag when run on a sufficiently new kernel. Implemented by Ulrich Drepper.
156 * Sorting rules for some Indian languages (Kannada, Gurumukhi, Telugu,
158 Implemented by Pravin Satpute.
160 * New locales: sd_IN, sd_IN@devanagari, ks_IN@devanagari, ht_HT, en_AG, nl_AW.
164 * New locales: bo_CN, bo_IN, shs_CA.
166 * New encoding: HP-ROMAN9, HP-GREEK8, HP-THAI8, HP-TURKISH8.
168 * Sorting rules for some Indian languages (Devanagari and Gujarati).
169 Implemented by Pravin Satpute.
171 * IPV6 addresses in /etc/resolv.conf can now have a scope ID
173 * nscd caches now all timeouts for DNS entries
174 Implemented by Ulrich Drepper.
176 * nscd is more efficient and wakes up less often.
177 Implemented by Ulrich Drepper.
179 * More checking functions: asprintf, dprintf, obstack_printf, vasprintf,
180 vdprintf, and obstack_vprintf.
181 Implemented by Jakub Jelinek.
183 * Faster memset for x86-64.
184 Implemented by Harsha Jagasia and H.J. Lu.
186 * Faster memcpy on x86.
187 Implemented by Ulrich Drepper.
189 * ARG_MAX is not anymore constant on Linux. Use sysconf(_SC_ARG_MAX).
190 Implemented by Ulrich Drepper.
192 * Faster sqrt and sqrtf implemention for some PPC variants.
193 Implemented by Stephen Munroe.
197 * More checking functions: fread, fread_unlocked, open*, mq_open.
198 Implemented by Jakub Jelinek and Ulrich Drepper.
200 * Extend fortification to C++. Implemented by Jakub Jelinek.
202 * Implement 'm' modifier for scanf. Add stricter C99/SUS compliance
203 by not recognizing 'a' as a modifier when those specs are requested.
204 Implemented by Jakub Jelinek.
206 * PPC optimizations to math and string functions.
207 Implemented by Steven Munroe.
209 * New interfaces: mkostemp, mkostemp64. Like mkstemp* but allow additional
210 options to be passed. Implemented by Ulrich Drepper.
212 * More CPU set manipulation functions. Implemented by Ulrich Drepper.
214 * New Linux interfaces: signalfd, eventfd, eventfd_read, and eventfd_write.
215 Implemented by Ulrich Drepper.
217 * Handle private futexes in the NPTL implementation.
218 Implemented by Jakub Jelinek and Ulrich Drepper.
220 * Add support for O_CLOEXEC. Implement in Hurd. Use throughout libc.
221 Implemented by Roland McGrath and Ulrich Drepper.
223 * Linux/x86-64 vDSO support. Implemented by Ulrich Drepper.
225 * SHA-256 and SHA-512 based password encryption.
226 Implemented by Ulrich Drepper.
228 * New locales: ber_DZ, ber_MA, en_NG, fil_PH, fur_IT, fy_DE, ha_NG, ig_NG,
229 ik_CA, iu_CA, li_BE, li_NL, nds_DE, nds_NL, pap_AN, sc_IT, tk_TM, ug_CN,
232 + New iconv modules: MAC-CENTRALEUROPE, ISO-8859-9E, KOI8-RU.
233 Implemented by Ulrich Drepper.
237 * New Linux interfaces: epoll_pwait, sched_getcpu.
239 * New generic interfaces: strerror_l.
241 * nscd can now cache the services database. Implemented by Ulrich Drepper.
246 * For Linux, the sorting of addresses returned by getaddrinfo now also
247 handles rules 3, 4, and 7 from RFC 3484. I.e., all rules are handled.
248 Implemented by Ulrich Drepper.
250 * Allow system admin to configure getaddrinfo with the /etc/gai.conf file.
251 Implemented by Ulrich Drepper.
253 * New Linux interfaces: splice, tee, sync_file_range, vmsplice.
255 * New iconv module for MIK. Contributed by Alexander Shopov.
257 * For sites with broken group and/or passwd database, the auto-propagate
258 option of nscd can prevent creating ID lookup entries from the results
259 of a name lookup and vice versa. This usually is no problem but some
260 site might have problems with the default behavior.
261 Implemented by Ulrich Drepper.
263 * Iterating over entire database in NIS can be slow. With the
264 SETENT_BATCH_READ option in /etc/default/nss a system admin can decide
265 to trade time for memory. The entire database will be read at once.
266 Implemented by Ulrich Drepper.
268 * The interfaces introduced in RFC 3542 have been implemented by
271 * Support for the new ELF hash table format was added by Ulrich Drepper.
273 * Support for priority inheritance mutexes added by Jakub Jelinek and
276 * Support for priority protected mutexes added by Jakub Jelinek.
278 * New locales: nr_ZA, pa_PK, ca_AD, ca_FR, ca_IT, el_CY, tr_CY, as_IN,
279 or_IN, csb_PL, fy_NL, sr_ME.
283 * More overflow detection functions.
285 * New iconv converters for IBM1025, IBM1122, IBM1137, IBM1153,
286 IBM1154, IBM1155, IBM1156, IBM1157, and IBM1158 contributed by Jiro Sekiba.
288 More converters for IBM803, IBM901, IBM902, IBM921, IBM1008, IBM1097,
289 IBM1112, IBM1123, IBM1130, IBM1140, IBM1141, IBM1142, IBM1143, IBM1144,
290 IBM1145, IBM1146, IBM1147, IBM1148, IBM1149, IBM1166, IBM1167, IBM4517,
291 IBM4899, IBM4909, IBM4971, IBM5347, IBM9030, IBM9066, IBM9448, IBM12712,
292 IBM16804, IBM1364, IBM1371, IBM1388, IBM1390, and IBM1399 contributed
293 by Masahide Washizawa.
295 * It is now possible to install audit libraries for the dynamic linker using
296 LD_AUDIT. Implemented by Ulrich Drepper.
298 * The LinuxThreads add-on, providing pthreads on Linux 2.4 kernels, is no
299 longer supported. The new NPTL implementation requires Linux 2.6 kernels.
300 For a libc and libpthread that works well on Linux 2.4 kernels, we
301 recommend using the stable 2.3 branch.
303 * The new function open_wmemstream acts like open_memstream,
304 but uses a wchar_t wide character buffer.
306 * The new function ppoll is an improved version of poll, similar to pselect.
308 * New interfaces: fdopendir, openat, fstatat, fchmodat, fchownat,
309 futimesat, faccessat, mkdirat, mkfifoat, mknodat,
310 renameat, unlinkat, linkat, symlinkat, readlinkat.
312 * New Linux kernel system calls: unshare,
313 inotify_init, inotify_add_watch, inotify_rm_watch.
315 * The euidaccess function is now also known by the alias eaccess,
316 for compatibility with some other systems.
318 * Timezone data updated to 2006b version.
322 * The following bugs are resolved with this release:
324 38, 253, 549, 622, 653, 721, 758, 851, 877, 915, 934, 955, 961,
325 1016, 1037, 1076, 1079, 1080, 1081, 1082, 1083, 1084, 1085, 1086,
326 1087, 1088, 1090, 1091, 1092, 1093, 1094, 1095, 1096, 1097, 1098,
327 1099, 1100, 1101, 1102, 1103, 1104, 1105, 1106, 1107, 1108, 1109,
328 1110, 1111, 1112, 1113, 1125, 1137, 1138, 1249, 1250, 1251, 1252,
329 1253, 1254, 1350, 1358, 1394, 1438, 1498, 1534
331 Visit <http://sources.redhat.com/bugzilla/> for the details of each bug.
333 * As of this release, GCC 4 can be used to compile the C Library.
335 * Timezone data updated to 2005m version.
339 * The following bugs are resolved with this release:
341 284, 592, 602, 626, 633, 640, 650, 661, 671, 681, 693, 700, 710, 719,
342 722, 723, 725, 726, 727, 728, 729, 730, 731, 732, 733, 734, 735, 736,
343 737, 738, 739, 740, 741, 742, 743, 744, 745, 765, 767, 768, 769, 776,
344 777, 787, 821, 822, 823, 825
346 Visit <http://sources.redhat.com/bugzilla/> for the details of each bug.
350 * Support for RFC 3678. Real implementations exist only for Linux so far.
351 Implemented by Ulrich Drepper.
353 * nscd can now cache entries persistently. Expiring entries are reloaded.
354 For speedups the cache can be shared in memory with client processes.
355 Implemented by Ulrich Drepper.
357 * nscd can now perform SELinux checks.
358 Implemented by Matthew Rickard <mjricka@epoch.ncsc.mil>.
360 * getaddrinfo queries are now cached. Canonical name lookup is performed
362 Implemented by Ulrich Drepper.
364 * The nothrow function attribute is used when headers are used by gcc when
365 compiling C code. This can avoid significant amounts of exception
368 * The malloc functions perform more error checking and are stricter when
369 it comes to reacting on errors. The default action is to terminate
370 the process after showing an error message. Implemented by Ulrich Drepper.
372 * Reverse lookups of IPv6 addresses does not use bit string or .ip6.int
373 lookups anymore unless explicitly requested. Implemented by Ulrich Drepper.
375 * Namespaces in ld.so are implemented. DSOs can be loaded in separate
376 namespaces using the new function dlmopen(). This feature is of course,
377 like most other dynamic loading functionality, not available in statically
378 linked applications. Implemented by Ulrich Drepper.
380 * Low-overhead boundary checking variants of string and some stdio functions
381 were added. These are to be used in conjunction with a gcc patch by
382 Jakub Jelinek which adds calls to these functions if possible.
383 Implemented by Jakub Jelinek and Ulrich Drepper.
385 * Old code for several operating systems and machine architectures that
386 have not been in working condition in a long time have been removed from
387 the main source tree maintained by the GNU C Library's maintainers.
388 These files are now reside in the separate `ports' source module
389 that is usable as an add-on when building the library.
393 * New functions `dladdr1' and `dlinfo' in <dlfcn.h> provide more ways to
394 interrogate the dynamic linker, compatible with the Solaris interface.
396 * ELF thread-local storage support (TLS) now works on PowerPC and PowerPC64;
397 implemented by Paul Mackerras, Steven Munroe, and Roland McGrath.
399 * getifaddrs now uses the netlink interface on Linux to get its information.
400 Implemented by Thorsten Kukuk.
402 * getaddrinfo now implements AI_V4MAPPED, AI_ALL, and AI_ADDRCONF.
403 Implemented by Ulrich Drepper.
405 * support for non-executable stacks on x86 has been added. Changes mostly
408 * regex is now much faster for multibyte locales. Changes by Jakub Jelinek
411 * getaddrinfo now performs destination address selection according to
416 * Thread-safe interfaces for many functions that access locale data
417 were added in version 2.3, but these features were omitted from NEWS.
418 Many functions have variants with an `_l' suffix that take a `locale_t'
419 object as a parameter rather than consulting the current locale.
420 The new functions `newlocale', `duplocale', and `freelocale' in <locale.h>
421 create and maintain `locale_t' objects. Additionally, the new function
422 `uselocale' sets "the current locale" (as used by functions not so
423 parameterized) set for an individual thread. These features were added
424 in version 2.3, implemented by Ulrich Drepper and Roland McGrath.
426 * The functions getresuid, getresgid, setresuid, and setresgid, which
427 have long been available on Linux, are now declared in <unistd.h>
428 and are now also available on the Hurd.
430 * ELF thread-local storage support (TLS) now works on x86-64.
432 * The new dynamic string token $LIB is expanded in shared library names.
433 This normally expands to lib, but on some 64-bit platforms to lib64 instead.
435 * Aldy Hernandez contributed complete software floating point support for
436 PowerPC machines with no FPU.
438 * fexecve is implemented on Linux.
440 * The `btowc' function should work at least twice as fast due to
441 specialized callbacks in the iconv modules. Implemented by Bruno Haible.
443 * With approriate thread add-ons cancelable functions are now implemented
444 in libc.so as well. No need to call the function in libpthread. This
445 change allowed to finally disable the incorrect and expensive handling
446 of weak definition in ld.so.
448 * Yet more PLT entries in libc.so have been removed. We finally arrived
449 at the bare minimum. Startup times improved appropriately.
451 * Support for the new Linux/x86 system call interface was added. The
452 AT_SYSINFO auxiliary vector entry is recognized and handled.
456 * Masahide Washizawa contributed iconv modules for IBM1163 and IBM1164
459 * iconv (the program and the interface) now accepts empty names (excluding
460 options like //TRANSLIT) to mean "use charset of current locale".
462 * localedef can now transliterate characters in strings which are not in
463 the provided charmap. The information from the input locale is used.
465 * Prelinking support was added for ELF targets. This requires additional
466 tools and recent versions of the GNU binutils. Contributed by Jakub Jelinek.
468 * Read-only stdio streams now use mmap to speed up operation by eliminating
469 copying and buffer underflows. To use add 'm' to the mode string of
470 the fopen/fdopen/freopen call. Implemented by Ulrich Drepper.
472 * The malloc functions were completely rewritten by Wolfram Gloger based
473 on Doug Lea's malloc-2.7.0.c.
475 * Isamu Hasegawa contributed a completely new and POSIX-conformant
476 implementation of regex.
478 * Bruno Haible upgraded the iconv and locale implementation to support
481 * Contents of the LC_* and LANG environment variables in the CEN style are
482 not recognized anymore. It never was used. Change by Ulrich Drepper.
484 * The runtime (ld.so, libc, libpthread for Linux) now can handle the ELF
485 thread-local storage (TLS) ABI on some platforms.
486 Changes by Ulrich Drepper. SH support by Kaz Kojima.
488 * Bruno Haible contributed iconv converters for ISO-2022-JP-3, SHIFT JIS-X0213,
489 EUC-JISX0213, and TSCII.
491 * New header <ifaddrs.h> with functions `getifaddrs' and `freeifaddrs':
492 BSD-compatible interface for getting all network interface addresses.
493 Implementation for IPv4 by Roland McGrath.
495 * Loading of locale data is faster due to the introduction of a locale
496 archive. Implemented by Roland McGrath and Ulrich Drepper.
498 * Startup times are significantly reduced by not using exported functions
499 inside the library itself. Changes by Jakub Jelinek, Roland McGrath,
502 * Steven Munroe contributed a port to PowerPC64/Linux.
506 * The Hurd now uses the GNU libio implementation of stdio rather than the
507 old GNU stdio implementation, and uses a new ABI (libc.so.0.3).
509 * The Hurd on x86 now has the `ioperm' function and <sys/io.h> header file
510 with the same behavior as the Linux system call of the same name.
514 * Stephen Moshier implemented log2, log10, powl and cbrtl for the
515 128-bit long double format.
517 * Masahide Washizawa contributed iconv modules for IBM1132, IBM1133, IBM1160,
518 IBM1161, and IBM1162 charsets.
520 * Andreas Jaeger contributed a port to x86-64/Linux.
522 * Peter Bruin contributed a port to PowerPC/Hurd.
524 * libc functions using I/O streams now can handle wide-oriented streams
527 * optimizations in the dynamic linker. Binaries created by recent binutils
528 versions start up quicker due to reduced time spent on relocations.
530 * Support for use of gcc3 added by Jakub Jelinek and HJ Lu.
534 * Stephen Moshier implemented cosh, expm1, log1p, acos, sinh, tanh,
535 asinh, atanh, j0 for the 128-bit long double format.
537 * Bruno Haible updated all the code handling Unicode in some form to
540 * Speed of regex for single-byte locales is back to previous levels.
541 Patch by Isamu Hasegawa.
543 * Alpha, SPARC, and IA-64 now also using floating stacks.
545 * Startup time of internationalized applications greatly improved through
546 iconv cache. Use iconvconfig to generate the cache file.
547 Contributed by Ulrich Drepper.
549 * The IA-64 specific part of ld.so was rewritten to eliminate some pretty
550 severe performance problems. Patch by David Mosberger.
552 * The Hurd port got a lot more functionality like AIO, various stdio
553 extensions, etc. Mainly done by Roland McGrath.
555 * mtrace can now lookup symbols in shared libraries.
559 * Intel's IA-64 math library is largely integrated. It provides fast and
560 accurate implementatations for most basic and standard math functions
561 in float, double, and long double format.
563 * Stephen Moshier implemented j0, j1, jn, y0, y1, yn, lgamma, erf, erfc,
564 and asin for the 96-bit long double format and asin, log, tan for the
565 128-bit long double format.
567 * The beginning of a last-bit accurate math library by IBM Haifa were added.
568 The basic double functions exist today. Contributed by Abraham Ziv
569 <ziv@il.ibm.com>, Moshe Olshansky <olshansk@il.ibm.com>, Ealan Henis
570 <ealan@il.ibm.com>, and Anna Reitman <reitman@il.ibm.com>.
572 * An asynchronous name lookup library was added. The interface is designed
573 after POSIX AIO. The proposal was circulated beforehand to get comments.
574 No negative ones came in. Implemented by Ulrich Drepper.
576 * Port to S390/64bit contributed by Martin Schwidefsky
577 <schwidefsky@de.ibm.com>.
579 * David Mosberger <davidm@hpl.hp.com> implemented the setcontext family
580 of functions for Linux/IA-64.
582 * The RPC code is now thread safe. Threads can now use the same service
583 of different services at the same time. Patch by Eric Norum
584 <eric.norum@usask.ca> with some help by Ulrich Drepper.
586 * Martin Schwidefsky <schwidefsky@de.ibm.com> implemented the setcontext
587 family of functions for Linux/S390.
589 * Ulrich Drepper <drepper@redhat.com> implemented the setcontext family
590 of functions for Linux/x86.
592 * Port to Linux/CRIS contributed by Axis Communications.
596 * Lots of headers were cleaned up. Using the tool in the conform/ subdir
597 we can now check for namespace violations and missing declarations. The
598 result is that almost all headers are now Unix-compliant (as defined in
599 the upcoming XPG6). The negative side is that some programs might need
600 corrections, too, if they depend on the incorrect form of the headers in
601 previous versions which defined too many symbols and included too many
604 * regex now handles multibyte character sets correctly.
605 Contributed by Isamu Hasegawa <isamu@yamato.ibm.com>.
607 * iconv (the program) does now conform to the upcoming XPG6 and handles
608 charmaps. Instead of the charset names the path of charmaps can be
609 provided and the conversion happens based on this data.
610 Contributed by Ulrich Drepper.
612 * The locale program now provides detailed information about the installed
617 only lists the names of the supported locales
621 provides details such as country, language, and codeset name.
622 Contributed by Ulrich Drepper.
626 * The gencat program now parses the input file according to the charset
627 selected by the LC_CTYPE category. This is important for stateful
628 character sets. To make generating catalogs easier there is a way
629 to overwrite the charset selected by the locale: before the first
630 message or $ quote line the catalog can contain a line like
634 to select the charset (ISO-8859-2 in this case).
636 Implemented by Shinya Hanataka and Ulrich Drepper.
638 * New codeset conversion modules: IBM-922 (Estonia PC codeset),
639 IBM-1124 (Ukraine PC codeset), IBM-1129 (Vietnamese PC codeset).
640 Contributed by Masahide Washizawa <washi@jp.ibm.com>.
642 * Optimized string functions for Alpha ev6 and ev67 by Richard Henderson
643 <rth@redhat.com> and Rick Gorton <rick.gorton@alpha-processor.com>.
645 * The LANGUAGE environment variable is now ignored unless the locale is
646 changed from the default "C" locale.
648 * The usual bug fixes.
652 * Greg McGary added runtime support for bounds checking using gcc's
653 new -fbounded-pointers option. ix86 target is complete. PowerPC
656 * Thorsten Kukuk added secure mode support to nscd.
658 * The Berkeley db libraries have been removed.
660 Related, the nss_db module is now in a separate package since it
661 obviously requires a database library being available.
663 * Wide character I/O streams implemented by Ulrich Drepper.
665 * Functions from the extended socket API added by Ulrich Drepper.
667 * Functions feenableexcept and fedisableexcept to control the
668 behaviour of individual exceptions have been added by Andreas Jaeger.
670 * ldconfig program added by Andreas Jaeger and Jakub Jelinek.
672 * The resolver code has been updated from bind 8.2.3-T5B which supports
673 threads. The integration was done by Andreas Jaeger, Adam D. Bradley,
676 This change could in some situations effect backward compatibility. Since
677 now `_res' is a thread-local instead of a global variable, modifying it
678 in one thread does not have any effect in other threads.
680 The resolver library was also extended to allow IPv6 as the transport
681 protocol for the requests. This work was done by Stig Venaas.
683 * Compatibility code for K&R C compilers has been removed from the
684 header files. A ISO C compiler is needed to use the library
685 (conforming to either C89 or C99 standard).
687 * Complete rewrite of the localedef program to support multibyte character
688 sets. Implement handling of ISO 14651 and ISO 14652. Rewrite strcoll,
689 strxfrm, wcscoll, and wcsxfrm functions. Make isw*() functions work.
690 Implemented by Ulrich Drepper.
692 Bruno Haible significantly improved the generation and use of the data
693 structures for the wide character tables.
695 * Plural handling in gettext implemented by Ulrich Drepper.
697 * The utmp daemon has been removed.
699 * The port to MIPS-Linux has been finished by Andreas Jaeger.
701 * A port to Hitachi SH3 and SH4 has been contributed by Kazumoto Kojima
704 * POSIX clocks and timers implemented by Kaz Kylheku and Ulrich Drepper.
706 * POSIX barriers implemented by Kaz Kylheku.
708 * POSIX spawn function family implemented by Ulrich Drepper.
710 * POSIX spinlocks are now available.
712 * Timed wait functions for mutex, rwlock, and semaphores are implemented.
714 * the configure option --enable-kernel=X.Y.Z allows to strip out
715 compatibility for kernel versions before X.Y.Z. This is currently only
716 implemented for Linux.
718 * the sockaddr_in6 structure changed. The IPv6 working group added a new
719 field sin6_scope_id. This means that all programs using IPv6 should be
720 recompiled. Don't expect binary compatibility with previous glibc
723 * various conversion modules for IBM character sets contributed by
726 * IA-64 port by Jes Sorensen and HJ Lu.
728 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
729 Compiling the GNU C Library for Linux/ia64
730 ******************************************
732 Please refer to the file INSTALL in the same directory as you found
733 this file for general information about configuring and compiling
736 For general inquiries about glibc under Linux/ia64 please use the
737 following mailing list linux-ia64@linuxia64.org or one of the relevant
740 Recommended Tools for Compilation
741 =================================
743 In order for glibc-2.2 to build correctly on the ia64 you need at
744 least the following versions of the GNU tools (the :
746 * The Cygnus toolchain snapshot for the ia64 as of August 4
747 including the provided set of patches. It is however recommend
748 you use the October 24 toolchain snapshot or a more recent version.
750 OR alternatively you can try the following (the Cygnus toolchain is
751 the recommended solution):
753 * GCC and binutils, GAS and GNU LD out of CVS from
754 sources.redhat.com as of August 28, 2000 or later. The CVS tree
755 may require special patches to work properly on the ia64.
757 Configuring and compiling GNU Libc for Linux/ia64
758 =================================================
760 The library requires Linux kernel version 2.4.0-test4-000728 or
761 later to funtion properly. Besides that it support for debug libraries
762 is currently untested. Hence the following options
763 are required for configuring the library:
765 --disable-debug --enable-kernel=2.4.0
767 It is also important that you make sure the library picks up the
768 appropriate kernel header files, if you do not have recent enough
769 kernel headers in /usr/src/linux/include, you should use the
770 --with-headers=<path> option to specify the location.
772 As an example I personally use the following options to configure
777 --enable-kernel=2.4.0
781 --with-headers=/home/jes/linux/include
786 Jes Sorensen <jes@linuxcare.com>,
788 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
802 * New ISO C 9x function _Exit, imaxabs, and imaxdiv are added.
804 * New xdr functions are added; some rpc functions are now 64bit clean.
806 * Fixed a number of bugs and memory leaks (especially in NIS+ code).
808 * Fixed known incompatibilities with glibc 2.0.
810 * New functions lock64, strchrnul, rawmemchr, getutmp and getutmpx.
812 * Optimized a number of functions (especially the ELF dynamic loader).
814 * Update timezone data files.
816 * lots of charmaps corrections
818 * some new locale definitions and charmaps
823 * Richard Henderson corrected size of struct timeval on Linux/Alpha to
824 conform to POSIX member type requirements. Symbol versions have been
825 adjusted as needed within the library, and for direct use by applications,
826 but there is potential for problems if third-party libraries use
827 struct timeval as part of their interface. This does not present
828 a problem for X and other "essential" system libraries.
830 * An additional locale model to support C++ Standard Library locale
831 model and probably more was implemented by Ulrich Drepper.
833 * Eric Youngdale and Ulrich Drepper implemented versioning of objects on
836 * Miles Bader provided the `argp' function family to support hierachical
837 command line argument parsing, layered on top of getopt.
839 * strtod accepts new hexadecimal floating-point format from ISO C 9X.
841 * printf has two new specifiers %a and %A to print hexadecimal flaoting-point
844 * scanf recognizes the %a and %A format for scanning floating point numbers.
846 * the new headers <stdint.h> and <inttypes.h> from ISO C 9X provides
847 information and interfaces for the available integer types.
849 * about 130 new math functions were added to implement the ISO C9x math
852 * the new header <complex.h> contains definitions of the complex math
853 functions from ISO C 9X.
855 * the new header <tgmath.h> defines generic macros to use complex or
856 real valued functions.
858 * Thorsten Kukuk provided an implementation for NIS+, securelevel 0, 1 and 2.
860 * Andreas Jaeger provided a test suite for the math library.
862 * Mark Kettenis implemented the utmpx interface and an utmp daemon.
864 * Ulrich Drepper added character set conversion functions (iconv).
866 * Optimized string functions have been added.
868 * The localedata addon is now part of glibc.
870 * An implementation of profiling shared libraries was added by Ulrich Drepper.
872 * Thorsten Kukuk and Ulrich Drepper provided an implementation for a caching
873 daemon for NSS (nscd).
875 Missing a better place here are some numbers on improvements. Under
876 Linux 2.1.125 un-tar-ing the kernel sources takes
880 using local files 12.19s 6.88s 22.91s
882 using NIS 13.92s 8.91s 26.34s
884 using NIS & nscd 10.37s 7.34s 25.30s
886 using NIS+ 27.57s 30.37s 640.46s
888 using NIS+ & nscd 10.25s 7.83s 26.51s
890 using NIS & old nscd [1] 13.83s 8.32s 29.60s
892 Keep in mind that non-namelookup related operations dominate above times.
893 It was just a common complain that using NIS+ unpacking the kernel is
896 [1] The old nscd implementation is not available anymore since it was
897 distributed with glibc up to version 2.0.98 and thus is now replaced.
899 * Tim Waugh provided an implementation of the POSIX.2 wordexp function family.
901 * Mark Kettenis provided a Hesiod NSS module.
903 * The ELF dynamic loader knows how to process dynamic string tokens ($ORIGIN
904 and $PLATFORM) in RPATHs and similar strings (Ulrich Drepper).
906 * rcmd can now handle netgroups (Dick Streefland).
908 * A port to the ARM was contributed by Phil Blundell, Pat Beirne and Scott
911 * Support for the IPv6 protocol has been added to the socket API, as per the
912 latest draft standards.
914 * Support for Linux 2.2 has been added.
916 * Interface changes relative to the latest 2.0.x release:
917 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
918 addseverity NEW: Unix98
920 argp_err_exit_status NEW: argp, GNU ext
921 argp_error NEW: argp, GNU ext
922 argp_failure NEW: argp, GNU ext
923 argp_help NEW: argp, GNU ext
924 argp_parse NEW: argp, GNU ext
925 argp_program_bug_address NEW: argp, GNU ext
926 argp_program_version NEW: argp, GNU ext
927 argp_program_version_hook NEW: argp, GNU ext
928 argp_state_help NEW: argp, GNU ext
929 argp_usage NEW: argp, GNU ext
930 authdes_create NEW: Secure RPC
931 authdes_getucred NEW: Secure RPC
932 authdes_pk_create NEW: Secure RPC
933 backtrace NEW: GNU ext.
934 backtrace_symbols NEW: GNU ext.
935 backtrace_symbols_fd NEW: GNU ext.
939 cacoshf NEW: ISO C 9x
940 cacoshl NEW: ISO C 9x
950 casinhf NEW: ISO C 9x
951 casinhl NEW: ISO C 9x
956 catanhf NEW: ISO C 9x
957 catanhl NEW: ISO C 9x
959 cbc_crypt NEW: Secure RPC
972 clearerr_locked REMOVED
973 clntunix_create NEW: sunrpc ext
976 clog10f NEW: ISO C 9x
977 clog10l NEW: ISO C 9x
1000 csqrtf NEW: ISO C 9x
1001 csqrtl NEW: ISO C 9x
1005 ctanhf NEW: ISO C 9x
1006 ctanhl NEW: ISO C 9x
1008 des_setparity NEW: Secure RPC
1009 ecb_crypt NEW: Secure RPC
1010 endutxent NEW: Unix98
1012 exp10f NEW: ISO C 9x
1013 exp10l NEW: ISO C 9x
1017 fattach NEW: STREAMS
1018 fdetach NEW: STREAMS
1022 feclearexcept NEW: ISO C 9x
1023 fegetenv NEW: ISO C 9x
1024 fegetexceptflag NEW: ISO C 9x
1025 fegetround NEW: ISO C 9x
1026 feholdexcept NEW: ISO C 9x
1028 feraiseexcept NEW: ISO C 9x
1029 ferror_locked REMOVED
1030 fesetenv NEW: ISO C 9x
1031 fesetexceptflag NEW: ISO C 9x
1032 fesetround NEW: ISO C 9x
1033 fetestexcept NEW: ISO C 9x
1034 feupdateenv NEW: ISO C 9x
1035 fflush_locked REMOVED
1039 fgets_unlocked NEW: GNU ext.
1040 fileno_locked REMOVED
1052 fputc_locked REMOVED
1053 fputs_unlocked NEW: GNU ext.
1054 fread_unlocked NEW: GNU ext.
1059 fstatvfs NEW: Unix98
1063 ftruncate64 NEW: LFS
1065 fwrite_unlocked NEW: GNU ext.
1066 gai_strerror NEW: IPv6
1070 getchar_locked REMOVED
1072 getdate_err NEW: Unix98
1073 getdate_r NEW: GNU ext.
1075 getnameinfo NEW: IPv6
1076 getnetname NEW: Secure RPC
1077 getpmsg NEW: STREAMS
1078 getpt NEW: Unix98 PTY
1079 getrlimit64 NEW: LFS
1080 getutxent NEW: Unix98
1081 getutxid NEW: Unix98
1082 getutxline NEW: Unix98
1083 glob64 NEW: GNU ext.
1084 globfree64 NEW: GNU ext.
1085 gnu_get_libc_release NEW: GNU ext.
1086 gnu_get_libc_version NEW: GNU ext.
1087 grantpt NEW: Unix98 PTY
1088 host2netname NEW: Secure RPC
1090 iconv_close NEW: iconv
1091 iconv_open NEW: iconv
1092 if_freenameindex NEW: IPv6
1093 if_indextoname NEW: IPv6
1094 if_nameindex NEW: IPv6
1095 if_nametoindex NEW: IPv6
1096 in6addr_any NEW: IPv6
1097 in6addr_loopback NEW: IPv6
1098 inet6_isipv4mapped NEW: IPv6
1099 isastream NEW: STREAMS
1100 iswblank NEW: GNU ext.
1101 key_decryptsession NEW: Secure RPC
1102 key_decryptsession_pk NEW: Secure RPC
1103 key_encryptsession NEW: Secure RPC
1104 key_encryptsession_pk NEW: Secure RPC
1105 key_gendes NEW: Secure RPC
1106 key_get_conv NEW: Secure RPC
1107 key_secretkey_is_set NEW: Secure RPC
1108 key_setnet NEW: Secure RPC
1109 key_setsecret NEW: Secure RPC
1110 llrint NEW: ISO C 9x
1111 llrintf NEW: ISO C 9x
1112 llrintl NEW: ISO C 9x
1113 llround NEW: ISO C 9x
1114 llroundf NEW: ISO C 9x
1115 llroundl NEW: ISO C 9x
1120 lrintf NEW: ISO C 9x
1121 lrintl NEW: ISO C 9x
1122 lround NEW: ISO C 9x
1123 lroundf NEW: ISO C 9x
1124 lroundl NEW: ISO C 9x
1126 makecontext NEW: Unix98
1127 mempcpy NEW: GNU ext.
1130 modify_ldt NEW: kernel
1134 nearbyint NEW: ISO C 9x
1135 nearbyintf NEW: ISO C 9x
1136 nearbyintl NEW: ISO C 9x
1137 netname2host NEW: Secure RPC
1138 netname2user NEW: Secure RPC
1139 nexttoward NEW: ISO C 9x
1140 nexttowardf NEW: ISO C 9x
1141 nexttowardl NEW: ISO C 9x
1145 passwd2des NEW: Secure RPC
1147 pow10f NEW: GNU ext.
1148 pow10l NEW: GNU ext.
1151 printf_size NEW: GNU ext.
1152 printf_size_info NEW: GNU ext.
1153 profil_counter REMOVED
1154 pthread_mutexattr_getkind_np REPLACED
1155 pthread_mutexattr_setkind_np REPLACED
1156 ptsname NEW: Unix98 PTY
1157 ptsname_r NEW: Unix98 PTY
1159 putchar_locked REMOVED
1160 putgrent NEW: GNU ext.
1162 putpmsg NEW: STREAMS
1163 pututxline NEW: Unix98
1167 readdir64_r NEW: LFS
1168 remquo NEW: ISO C 9x
1169 remquof NEW: ISO C 9x
1170 remquol NEW: ISO C 9x
1172 roundf NEW: ISO C 9x
1173 roundl NEW: ISO C 9x
1175 scalbln NEW: ISO C 9x
1176 scalblnf NEW: ISO C 9x
1177 scalblnl NEW: ISO C 9x
1179 sendfile NEW: kernel
1180 setcontext NEW: Unix98
1181 setrlimit64 NEW: LFS
1182 setutxent NEW: Unix98
1184 sigignore NEW: Unix98
1185 sigqueue NEW: POSIX.1b
1186 sigrelse NEW: Unix98
1187 sigset NEW: POSIX.1b
1188 sigtimedwait NEW: POSIX.1b
1189 sigwaitinfo NEW: POSIX.1b
1190 sincos NEW: GNU ext.
1191 sincosf NEW: GNU ext.
1192 sincosl NEW: GNU ext.
1196 strcasestr NEW: GNU ext.
1197 strtoimax NEW: ISO C 9x
1198 strtoumax NEW: ISO C 9x
1199 strverscmp NEW: GNU ext.
1200 svcauthdes_stats NEW: Secure RPC
1201 svcunix_create NEW: sunrpc etx
1202 svcunixfd_create NEW: sunrpc ext
1203 swapcontext NEW: Unix98
1204 tcgetsid NEW: Unix98 PTY
1205 tdestroy NEW: GNU ext.
1206 tgamma NEW: ISO C 9x
1207 tgammaf NEW: ISO C 9x
1208 tgammal NEW: ISO C 9x
1212 truncf NEW: ISO C 9x
1213 truncl NEW: ISO C 9x
1215 unlockpt NEW: Unix98 PTY
1216 updwtmpx NEW: Unix98
1217 user2netname NEW: Secure RPC
1218 utmpxname NEW: Unix98
1219 versionsort NEW: GNU ext.
1220 versionsort64 NEW: GNU ext.
1222 wcscasecmp NEW: GNU ext.
1223 wcsncasecmp NEW: GNU ext.
1224 wcsnlen NEW: GNU ext.
1225 wcstoimax NEW: ISO C 9x
1226 wcstoll NEW: ISO C 9x
1227 wcstoull NEW: ISO C 9x
1228 wcstoumax NEW: ISO C 9x
1230 wordexp NEW: POSIX.2
1231 wordfree NEW: POSIX.2
1232 write_profiling REMOVED
1233 xdecrypt NEW: Secure RPC
1234 xdr_authdes_cred NEW: Secure RPC
1235 xdr_authdes_verf NEW: Secure RPC
1236 xdr_cryptkeyarg NEW: Secure RPC
1237 xdr_cryptkeyarg2 NEW: Secure RPC
1238 xdr_cryptkeyres NEW: Secure RPC
1239 xdr_getcredres NEW: Secure RPC
1240 xdr_key_netstarg NEW: Secure RPC
1241 xdr_key_netstres NEW: Secure RPC
1242 xdr_keybuf NEW: Secure RPC
1243 xdr_keystatus NEW: Secure RPC
1244 xdr_netnamestr NEW: Secure RPC
1245 xdr_sizeof NEW: Secure RPC
1246 xdr_unixcred NEW: sunrpc ext
1247 xencrypt NEW: Secure RPC
1248 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
1259 * inet_ntoa is thread-safe
1261 * updwtmp is moved from libutil to libc
1263 * rewrite of cbrt function
1265 * update of timezone data
1279 * add atoll function
1281 * fix complex problems in Berkeley DB code
1283 * fix math functions
1287 * fixed lots of header problems (especially Linux/GNU specific)
1289 * dynamic loader preserves all registers
1291 * Roland McGrath provided support for handling of auxiliary objects in
1292 the ELF dynamic loader.
1294 * support for parallel builds is improved
1298 * GNU extensions are no longer declared by default. To enable them you
1299 must define the macro `_GNU_SOURCE' in your program or compile with
1302 * The library has changed from using GNU ld symbol aliases to using weak
1303 symbols where available. The ELF object file format supports weak
1304 symbols; GNU ld also supports weak symbols in the a.out format. (There
1305 is also now support for other GNU ld extensions in ELF. Use the
1306 `--with-elf' option to configure to indicate you have ELF, and
1307 `--with-gnu-ld' if using GNU ld.) This change resulted in the deletion
1308 of many files which contained only symbol aliases, reducing the size of
1309 the source and the compiled library; many other files were renamed to
1310 less cryptic names previously occupied by the symbol alias files.
1311 There is a new header file <elf.h> for programs which operate on
1312 files in the ELF format.
1314 * Converted to Autoconf version 2, so `configure' has more options.
1315 Run `configure --help' to see the details.
1317 * The library can now be configured to build profiling, highly-optimized
1318 (but undebuggable), and/or shared libraries (ELF with GNU ld only). The
1319 `--enable-profile', `--enable-omitfp', and `--enable-shared' options to
1320 `configure' enable building these extra libraries. The shared library is
1321 built by default when using both ELF and GNU ld. When shared libraries
1322 are enabled, the new library `-ldl' is available for arbitrary run-time
1323 loading of shared objects; its interface is defined in <dlfcn.h>. The
1324 new header file <link.h> gives access to the internals of the run-time
1325 dynamic linker, `ld.so'. The shell script `ldd' is similar to the
1326 application of same name on other systems and it provides information
1327 about dynamically linked binaries.
1329 * The C library now provides the run-time support code for profiling
1330 executables compiled with `-pg'. Programs can control the profiling code
1331 through the interface in <sys/gmon.h>. The `gmon.out' files written by
1332 the GNU C library can be read only by GNU `gprof' (from GNU binutils);
1333 the support for this file format was contributed by David Mosberger-Tang.
1335 * The math code has been replaced with a math library based on fdlibm from
1336 Sun, and modified by JT Conklin and Ulrich Drepper with i387 support, by
1337 Ian Taylor with `float' functions and by Ulrich Drepper with `long double'
1338 functions. The math functions now reside in a separate library, so
1339 programs using them will need to use `-lm' their linking commands.
1341 * John C. Bowman contributed optimized ix87 assembler inline functions.
1343 * Ulrich Drepper has contributed support for an `/etc/nsswitch.conf'
1344 mechanism similar to that found in Solaris 2. This is now used for the
1345 group, passwd, hosts, networks, services, protocols, rpc, ethers,
1346 shadow, netgroup, publickey, and alias databases. The `nsswitch.conf'
1347 file controls what services are used for each individual database. This
1348 works by loading shared libraries with names specified in `nsswitch.conf',
1349 so service modules can be changed or added at any time without even
1350 relinking any program. Currently there are the file, db, and NIS based
1351 NSS services available.
1353 * The new functions `strtoq' and `strtouq' parse integer values from
1354 strings, like `strtol' and `strtoul', but they return `long long int' and
1355 `unsigned long long int' values, respectively (64-bit quantities).
1357 * The new functions `strtof' and `strtold' parse floating-point values from
1358 strings, like `strtod', but they return `float' and `long double' values,
1359 respectively (on some machines `double' and `long double' are the same).
1361 * Ulrich Drepper has contributed new implementations of the floating-point
1362 printing and reading code used in the `printf' family of functions and
1363 `strtod', `strtof', and `strtold'. These new functions are perfectly
1364 accurate, and much faster than the old ones.
1366 * The implementation of the POSIX locale model was completely rewritten by
1367 Ulrich Drepper. This includes the new programs `localedef' and `locale'
1368 to compile the POSIX locale definition.
1370 * The former dummy implementations of the strcoll and strxfrm function are
1371 now replaced by fully functional code contributed by Ulrich Drepper. The
1372 collation information comes from the POSIX locale definitions.
1374 * The new header <langinfo.h> defines an interface for accessing
1375 various locale-dependent data (using the locale chosen with `setlocale').
1377 * Ulrich Drepper has contributed a new suite of functions for operation on
1378 wide-character and multibyte-character strings, in <wchar.h>;
1379 and classification and case conversion of wide characters, in <wctype.h>.
1380 These new functions are conforming to the ISO C, Amendement 1 specification.
1382 * There is now a second implementation of the standard I/O library available.
1383 It comes from GNU libg++ as was written by Per Bothner, heavily modified
1384 by Hongjiu Lu and made thread safe by Ulrich Drepper.
1386 * You can now use positional parameter specifications in format strings
1387 for the `printf' and `scanf' families of functions. For example,
1388 `printf ("Number %2$d, Mr %1$s\n", "Jones", 6);'' prints
1389 ``Number 6, Mr Jones''. This is mainly useful when providing different
1390 format strings for different languages, whose grammars may dictate
1391 different orderings of the values being printed. To support this
1392 feature, the interface for `register_printf_handler' has changed; see
1393 the header file <printf.h> for details.
1395 * The `printf' and `scanf' families of functions now understand a new
1396 formatting flag for numeric conversions: the ' flag (e.g. %'d or %'f) says
1397 to group numbers as indicated by the locale; for `scanf' and friends, this
1398 says to accept as valid only a number with all the proper grouping
1399 separators in the right places. In the default "C" locale, numbers are
1400 not grouped; but locales for specific countries will define the usual
1401 conventions (i.e. separate thousands with `,' in the US locale).
1403 * The pgrp functions have been regularized, slightly incompatibly but much
1404 less confusingly. The core functions are now `getpgid' and `setpgid',
1405 which take arguments for the PID to operate on; the POSIX.1 `getpgrp' (no
1406 argument) and BSD `setpgrp' (identical to `setpgid') functions are
1407 provided for compatibility. There is no longer an incompatible `getpgrp'
1408 with an argument declared under _BSD_SOURCE; no BSD code uses it.
1410 * The new header file <fts.h> and suite of functions simplify programs that
1411 operate on directory trees. This code comes from 4.4 BSD.
1413 * The resolver code has been updated from the BIND 4.9.5-P1 release.
1414 Parts of the code were heavily modified by Ulrich Drepper to fit in the
1415 NSS scheme used in glibc.
1417 * There is a new malloc debugging hook `__memalign_hook'.
1419 * There are new typedefs `ushort' for `unsigned short int' and `uint' for
1420 `unsigned int' in <sys/types.h>. These are for compatibility only and
1421 their use is discouraged.
1423 * The `-lmcheck' library to enable standard malloc debugging hooks is now
1424 done differently, so that it works even without GNU ld.
1426 * New function `euidaccess' checks allowed access to a file like `access',
1427 but using the effective IDs instead of the real IDs.
1429 * The time zone data files have been updated for the latest and greatest
1430 local time conventions of the countries of the world.
1432 * The new function `dirfd' extracts the file descriptor used by a DIR stream;
1435 * The new functions `ecvt', `fcvt', and `gcvt' provide an obsolete interface
1436 for formatting floating-point numbers. They are provided only for
1437 compatibility; new programs should use `sprintf' instead. There are
1438 also equivalent function for the `long double' floating-point type and
1439 all functions also exist in a reentrant form.
1441 * The new auxiliary library `-lutil' from 4.4 BSD contains various
1442 functions for maintaining the login-record files (primarily of use to
1443 system programs such as `login'), and convenient functions for
1444 allocating and initializing a pseudo-terminal (pty) device.
1446 * Ulrich Drepper has contributed new support for System V style
1447 shared memory and IPC on systems that support it.
1449 * Ulrich Drepper has contributed several miscellaneous new functions found
1450 in System V: The `hsearch' family of functions provide an effective
1451 implementation of hash tables; `a64l' and `l64a' provide a very simple
1452 binary to ASCII mapping; `drand48' and friends provide a 48-bit random
1455 * Ulrich Drepper has contributed new reentrant counterparts for the
1456 `random' and `hsearch' families of functions; `random_r', `hsearch_r', etc.
1458 * Ulrich Drepper has contributed new, highly-optimized versions of several
1459 string functions for the i486/Pentium family of processors.
1461 * Ulrich Drepper has updated the Linux-specific code, based largely
1462 on work done in Hongjiu Lu's version of GNU libc for Linux.
1463 The GNU library now supports Linux versions 2.0.10 and later,
1464 using the ELF object file format (i[3456]86-*-linux).
1466 * Andreas Schwab has ported the C library to Linux/m68k (m68k-*-linux).
1468 * David Mosberger-Tang and Richard Henderson have ported the C library
1469 to Linux/Alpha (alpha-*-linux). Richard Henderson contributed the
1470 dynamic linking support for ELF/Alpha.
1472 * Richard Henderson contributed several Alpha optimized assembler function
1473 for arithmetic and string handling.
1475 * Ulrich Drepper has contributed a new set of message catalog functions to
1476 support multiple languages using the <libintl.h> interface, for use with
1477 his new package GNU gettext. Translation volunteers have contributed
1478 catalogs of the library's messages in Spanish, German, and Korean.
1480 * For compatibility with XPG4, Ulrich Drepper has contributed the `gencat'
1481 program and the `catgets' function for reading the catalog files it
1482 creates. (The <libintl.h> interface is preferred; we include the
1483 <nl_types.h> interface using `catgets' only for source compatibility with
1484 programs already written to use it.)
1486 * New header file <values.h> gives SVID-compatible names for <limits.h>
1489 * Various new macros, declarations, and small header files for compatibility
1492 * New function `group_member' is a convenient way to check if a process has
1493 a given effective group ID.
1495 * When using GCC 2.7 and later, the socket functions are now declared in a
1496 special way so that passing an argument of type `struct sockaddr_in *',
1497 `struct sockaddr_ns *', or `struct sockaddr_un *' instead of the generic
1498 `struct sockaddr *' type, does not generate a type-clash warning.
1500 * New function `error' declared in header file <error.h> is a convenient
1501 function for printing error messages and optionally exiting; this is the
1502 canonical function used in GNU programs. The new functions `err', `warn',
1503 and friends in header file <err.h> are the canonical 4.4 BSD interface for
1504 doing the same thing.
1506 * The <glob.h> interface has several new flags from 4.4 BSD that extend the
1507 POSIX.2 `glob' function to do ~ and {...} expansion.
1509 * New function `unsetenv' complements `setenv' for compatibility with 4.4 BSD.
1510 `clearenv' which is used in POSIX.9 is also available.
1512 * New function `getsid' returns session ID number on systems that support it.
1514 * We have incorporated the 4.4 BSD `db' library (version 1.85). New header
1515 files <db.h> and <mpool.h> provide a rich set of functions for several
1516 types of simple databases stored in memory and in files, and <ndbm.h> is
1517 an old `ndbm'-compatible interface using the `db' functions. Link with
1518 `-ldb' to get these functions.
1520 * New macro `strdupa' copies a string like `strdup', but uses local stack
1521 space from `alloca' instead of dynamic heap space from `malloc'.
1523 * New function `strnlen' is like `strlen' but searches only a given maximum
1524 number of characters for the null terminator. `stpncpy', `strndup' and
1525 `strndupa' are similar variants for the `stpcpy', `strdup' and `strdupa'
1528 * New function `statfs' in header <sys/statfs.h>.
1530 * The new <argz.h> and <envz.h> interfaces contributed by Miles Bader
1531 provide convenient functions for operating on blocks of null-terminated
1534 * A new suite of functions in <utmp.h> handle all the details of reading
1535 and writing the utmp file.
1537 * An implementation of the NIS/YP(tm) based NSS service was contributed by
1540 * Paul Eggert and Ulrich Drepper modified the `strftime' function to be
1541 completely POSIX compliant and also implemented the extended functionality
1542 to handle alternate digit representation and alternate era date formats.
1544 * Ulrich Drepper provided an implementation of the `strptime' function
1545 defined in XPG4.2 which transforms a string into a `struct tm' value.
1547 * Paul Eggert provided the tzselect shell script as part of the timezone
1548 code. The shell script makes it easy to select the correct timezone
1551 * The implementation of the malloc family of functions is completely replaced
1552 by a new implementation by Doug Lea with many improvements by Wolfram Gloger.
1553 The implementation uses the mmap function (if available) and it is
1554 optimized for the use in multi threaded programs.
1556 * Ulrich Drepper contributed a MD5 "encryption" for the crypt family of
1557 functions. This new functionality is usable by specifying a special
1558 salt string and it is compatible with implementation on *BSD systems.
1560 * Lots of functions from the XPG4.2 standard were added by Ulrich Drepper:
1561 `getsubopt' to handle second level command line options, `bsd_signal'
1562 to access BSD style `signal' functionality, the obsolete `regexp' style
1565 * the `lchown' function is available on system which support this
1568 * The implementation of the shadow password handling function was contributed
1571 * David Mosberger-Tang changed the SunRPC implementation to be 64bit safe.
1573 * POSIX.1g support was added. The <sys/select.h> header is available,
1574 `isfdtype' and `pselect' are implemented. Craig Metz contributed an
1575 implementation of `getaddrinfo'.
1579 * For cross-compilation you should now set `BUILD_CC' instead of `HOST_CC'.
1581 * New header file <fstab.h> and new functions `getfsspec', `getfsent' and
1582 friends, for parsing /etc/fstab. This code comes from 4.4 BSD.
1584 * The new function `daemon' from 4.4 BSD is useful for server programs that
1585 want to put themselves in the background.
1587 * Joel Sherrill has contributed support for several standalone boards that
1588 run without an operating system.
1590 * `printf', `scanf' and friends now accept a `q' type modifier for long
1591 long int as well as `ll'. Formats using these might be `%qu' or `%lld'.
1593 * All of the code taken from BSD (notably most of the math and networking
1594 routines) has been updated from the BSD 4.4-Lite release.
1596 * The resolver code has been updated from the BIND-4.9.3-BETA9 release.
1598 * The new functions `getdomainname' and `setdomainname' fetch or change the
1599 YP/NIS domain name. These are system calls which exist on systems which
1602 * The time zone data files have been updated for the latest international
1605 * The SunRPC programs `portmap' and `rpcinfo' are now installed in
1606 $(sbindir) (usually /usr/local/sbin) instead of $(bindir).
1610 * The C library now includes support for Sun RPC, from Sun's free
1611 RPCSRC-4.0 distribution. The `portmap', `rpcinfo', and `rpcgen' programs
1612 are included. (There is still no support for YP.)
1614 * Tom Quinn has contributed a port of the C library to SGI machines running
1615 Irix 4 (mips-sgi-irix4).
1617 * The new `lockf' function is a simplified interface to the locking
1618 facilities of `fcntl', included for compatibility.
1620 * New time functions `timegm', `timelocal', and `dysize' for compatibility.
1622 * New header file <sys/timeb.h> and new function `ftime' for compatibility.
1624 * New header files <poll.h> and <sys/poll.h> and new function `poll' for
1627 * The error message printed by `assert' for a failed assertion now includes
1628 the name of the program (if using GNU ld) and the name of the calling
1629 function (with versions of GCC that support this).
1631 * The `psignal' function is now declared in <signal.h>, not <stdio.h>.
1633 * The library now includes the <sys/mman.h> header file and memory
1634 management functions `mmap', `munmap', `mprotect', `msync', and
1635 `madvise', on systems that support those facilities.
1637 * The interface for `mcheck' has changed slightly: the function called to
1638 abort the program when an allocation inconsistency is detected now takes
1639 an argument that indicates the type of failure. The new function
1640 `mprobe' lets you request a consistency check for a particular block at
1641 any time (checks are normally done only when you call `free' or `realloc'
1644 * It is now possible to easily cross-compile the C library, building on one
1645 system a library to run on another machine and/or operating system. All
1646 you need to do is set the variable `HOST_CC' in `configparms' to the
1647 native compiler for programs to run on the machine you are building on (a
1648 few generator programs are used on Unix systems); set `CC' to the
1651 * The new function `fexecve' (only implemented on the GNU system) executes
1652 a program file given a file descriptor already open on the file.
1656 * Brendan Kehoe has contributed most of a port to the DEC Alpha
1657 running OSF/1 (alpha-dec-osf1). He says it is 75% complete.
1659 * You can set the variable `libprefix' in `configparms' to specify a prefix
1660 to be prepended to installed library files; this makes it easy to install
1661 the GNU C library to be linked as `-lgnuc' or whatever.
1663 * The new `stpncpy' is a cross between `stpcpy' and `strncpy': It
1664 copies a limited number of characters from a string, and returns the
1665 address of the last character written.
1667 * You no longer need to check for whether the installed `stddef.h' is
1668 compatible with the GNU C library. configure now checks for you.
1670 * You can now define a per-stream `fileno' function to convert the
1671 stream's cookie into an integral file descriptor.
1673 * ``malloc (0)'' no longer returns a null pointer. Instead, it
1674 allocates zero bytes of storage, and returns a unique pointer which
1675 you can pass to `realloc' or `free'. The behavior is undefined if
1676 you dereference this pointer.
1678 * The C library now runs on Sony NEWS m68k machines running either
1679 NewsOS 3 or NewsOS 4.
1681 * The new `syscall' function is a system-dependent primitive function
1682 for invoking system calls. It has the canonical behavior on Unix
1683 systems, including unreliable return values for some calls (such as
1684 `pipe', `fork' and `getppid').
1686 * The error code `EWOULDBLOCK' is now obsolete; it is always defined
1687 to `EAGAIN', which is the preferred name. On systems whose kernels
1688 use two distinct codes, the C library now translates EWOULDBLOCK to
1689 EAGAIN in every system call function.
1693 * The GNU C Library Reference Manual is now distributed with the library.
1694 `make dvi' will produce a DVI file of the printed manual.
1695 `make info' will produce Info files that you can read on line using C-h i
1696 in Emacs or the `info' program.
1697 Please send comments on the manual to bug-glibc-manual@gnu.org.
1699 * The library now supports SVR4 on i386s (i386-unknown-sysv4).
1701 * Brendan Kehoe has contributed a port to Sun SPARCs running Solaris 2.
1703 * Jason Merrill has contributed a port to the Sequent Symmetry running
1704 Dynix version 3 (i386-sequent-dynix).
1706 * The library has been ported to i386s running SCO 3.2.4 (also known as SCO
1707 ODT 2.0; i386-unknown-sco3.2.4) or SCO 3.2 (i386-unknown-sco3.2).
1709 * New function `memory_warnings' lets you arrange to get warnings when
1710 malloc is running out of memory to allocate, like Emacs gives you.
1712 * The C library now contains the relocating allocator used in Emacs 19 for
1713 its editing buffers. This allocator (ralloc) minimizes allocation
1714 overhead and fragmentation by moving allocated regions around whenever it
1715 needs to. You always refer to a ralloc'd region with a "handle" (a
1716 pointer to a pointer--an object of type `void **').
1718 * There is a new `printf' format: `%m' gives you the string corresponding
1719 to the error code in `errno'.
1721 * In `scanf' formats, you can now use `%as' or `%a[' to do the normal `%s'
1722 or `%[' conversion, but instead of filling in a fixed-sized buffer you
1723 pass, the `a' modifier says to fill in a `char **' you pass with a
1726 * The `fnmatch' function supports the new flag bits `FNM_LEADING_DIR' and
1727 `FNM_CASEFOLD'. `FNM_LEADING_DIR' lets a pattern like `foo*' match a
1728 name like `foo/bar'. `FNM_CASEFOLD' says to ignore case in matching.
1730 * `mkstemp' is a traditional Unix function to atomically create and open a
1731 uniquely-named temporary file.
1735 * The standard location for the file that says what the local timezone is
1736 has changed again. It is now `/usr/local/etc/localtime' (or more
1737 precisely, `${prefix}/etc/localtime') rather than `/etc/localtime'.
1739 * The distribution no longer contains any files with names longer than 14
1742 * `struct ttyent' has two new flag bits: TTY_TRUSTED and TTY_CONSOLE.
1743 These are set by the new `trusted' and `console' keywords in `/etc/ttys'.
1745 * New functions `ttyslot' and `syslog' from 4.4 BSD.
1749 * The configuration process has changed quite a bit. The `configure'
1750 script is now used just like the configuration scripts for other GNU
1751 packages. The `sysdeps' directory hierarchy is much rearranged.
1752 The file `INSTALL' explains the new scheme in detail.
1754 * The header files no longer need to be processed into ANSI C and
1755 traditional C versions. There is just one set of files to install, and
1756 it will work with ANSI or old C compilers (including `gcc -traditional').
1758 * Brendan Kehoe and Ian Lance Taylor have ported the library to the
1759 MIPS DECStation running Ultrix 4.
1761 * The Sun 4 startup code (crt0) can now properly load SunOS 4 shared libraries.
1762 Tom Quinn contributed the initial code. The GNU C library can NOT yet be
1763 made itself into a shared library.
1765 * Yet further improved support for the i386, running 4.3 BSD-like systems
1766 (such as Mach 3 with the Unix single-server), or System V.
1768 * New function `strncasecmp' to do case-insensitive string comparison
1769 with limited length.
1771 * New function `strsep' is a reentrant alternative to `strtok'.
1773 * New functions `scandir' and `alphasort' for searching directories.
1775 * New function `setenv' is a better interface to `putenv'.
1777 * Ian Lance Taylor has contributed an implementation of the SVID `ftw'
1778 function for traversing a directory tree.
1780 * The GNU obstack package is now also part of the C library.
1781 The new function `open_obstack_stream' creates a stdio stream that
1782 writes onto an obstack; `obstack_printf' and `obstack_vprintf' do
1783 formatted output directly to an obstack.
1785 * Miscellaneous new functions: reboot, nice, sigaltstack (4.4 BSD only),
1786 cfmakeraw, getusershell, getpass, swab, getttyent, seteuid, setegid.
1788 * `FNM_FILE_NAME' is another name for `FNM_PATHNAME', used with `fnmatch'.
1790 * The new functions `strfry' and `memfrob' do mysterious and wonderful
1791 things to your strings.
1793 * There are some new test programs: test-fseek, testmb, and testrand.
1795 * Some work has been done to begin porting the library to 4.4 BSD and Linux.
1796 These ports are not finished, but are a good starting place for really
1797 supporting those systems.
1799 * `/etc/localtime' is now the standard location for the file that says what
1800 the local timezone is, rather than `/usr/local/lib/zoneinfo/localtime'.
1801 This follows the general principle that `/etc' is the place for all local
1802 configuration files.
1804 * The C library header files now use `extern "C"' when used by the C++
1805 compiler, so the C library should now work with C++ code.
1807 * The header file <bstring.h> is gone. <string.h> now declares bcopy,
1808 bcmp, bzero, and ffs. (Update: nowadays these functions are declared
1811 * Mike Haertel (of GNU e?grep and malloc fame) has written a new sorting
1812 function which uses the `merge sort' algorithm, and is said to be
1813 significantly faster than the old GNU `qsort' function. Merge sort is
1814 now the standard `qsort' function. The new algorithm can require a lot
1815 of temporary storage; so, the old sorting function is called when the
1816 required storage is not available.
1818 * The C library now includes Michael Glad's Ultra Fast Crypt, which
1819 provides the Unix `crypt' function, plus some other entry points.
1821 * The code and header files taken from 4.4 BSD have been updated with the
1822 latest files released from Berkeley.
1824 ----------------------------------------------------------------------
1825 Copyright information:
1827 Copyright (C) 1992-1999,2000,2001,2002,2003,2004,2005,2006
1828 Free Software Foundation, Inc.
1830 Permission is granted to anyone to make or distribute verbatim copies
1831 of this document as received, in any medium, provided that the
1832 copyright notice and this permission notice are preserved,
1833 thus giving the recipient permission to redistribute in turn.
1835 Permission is granted to distribute modified versions
1836 of this document, or of portions of it,
1837 under the above conditions, provided also that they
1838 carry prominent notices stating who last changed them.
1841 version-control: never