1 GNU C Library NEWS -- history of user-visible changes. 2010-4-8
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 * STT_GNU_IFUNC implemented for Sparc by David Miller.
14 * The dynamic linker now recognizes supported ABI versions from the
15 EI_ABIVERSION field in the ELF header.
16 Implemented by Ulrich Drepper.
18 * New NIS mode selector ADJUNCT_AS_SHADOW. The passwd.adjunct.byname table
19 will not be used to fill in password fields in the passwd.byname replies.
20 Instead it is used to synthesize the shadow.byname table, should it be
21 missing. This is a useful mode in some installations involving Solaris.
22 Implemented by Ulrich Drepper.
24 * New locales: kok_IN, sq_MK
29 * New interfaces: execvpe, pthread_sigqueue, mkstemps, mkstemps64, mkostemps,
31 Implemented by Ulrich Drepper.
33 * Checking version of longjmp added that fails if an uninitialized stack
34 frame would be created. Implemented by Ulrich Drepper.
36 * STT_GNU_IFUNC is now supported in static executables.
37 Implemented by H.J. Lu.
39 * STT_GNU_IFUNC implemented for PPC by Alan Modra.
41 * New optimized string functions for x86-64: strstr, strcasestr, memcmp,
42 strcspn, strpbrk, strspn, strcpy, stpcpy, strncpy, strcmp (SSE2, SSE4.2),
43 strncmp (SSE2, SSE4.2), strchr (SSE4.2), strrchr (SSE4.2).
44 Contributed by H.J. Lu.
46 strlen, rawmemchr, strcmp (SSSE3), strncmp (SSSE3).
47 Implemented by Ulrich Drepper.
49 * New optimized string functions for x86: strlen, strcspn, strspn, strpbrk,
51 Contributed by H.J. Lu.
53 * Support for fma instruction in AVX on x86-64.
54 Implemented by H.J. Lu and Ulrich Drepper.
56 * AVX support in x86-64 auditing support in ld.so.
57 Implemented by H.J. Lu.
59 * STB_GNU_UNIQUE support added.
60 Implemented by Ulrich Drepper.
62 * Implement second fallback mode for optimized DNS lookup for even more
63 broken environments. If two requests from the same port are not
64 handled correctly close the socket and open a new one before sending
65 the second request. The 'single-request-reopen' option in /etc/resolv.conf
66 can be used to select this mode right away, instead of rediscovering the
67 necessity is every process again.
68 Implemented by Ulrich Drepper.
70 * New resolver flag RES_USE_DNSSEC to enable use of verified lookup.
71 Implemented by Adam Tkac.
73 * Optimized iconv conversions for S390x.
74 Implemented by Andreas Krebbel.
76 * Using condvars with PI mutexes is now more efficient due to kernel
77 support for requeueing to PI futexes. NPTL support added for x86-64.
78 Implemented by Ulrich Drepper.
80 * New locales: ps_AF, my_MM
85 * New interfaces: preadv, preadv64, pwritev, pwritev64, malloc_info
86 Implemented by Ulrich Drepper.
88 * New Linux interfaces: accept4, fallocate, fallocate64.
89 Implemented by Ulrich Drepper.
91 * Correct declarations of string function when used in C++ code. This
92 could lead to compile errors for invalid C++ code.
94 * XPG7/POSIX 2008 compilation environment. Many GNU-specific functions are
97 * New POSIX 2008 interface: psiginfo
98 Implemented by Ulrich Drepper.
100 * New ISO C++1x interfaces: quick_exit, at_quick_exit
101 Implemented by Ulrich Drepper.
103 * Support for selecting between multiple function definitions at runtime
104 using STT_GNU_IFUNC symbols. Implemented by Ulrich Drepper.
106 * The libcrypt library can now use the hash function implementations in
107 NSS. Implemented by Ulrich Drepper.
109 * The malloc implementation can be compiled to be less memory efficient
110 but higher performing in multi-threaded programs.
111 Implemented by Ulrich Drepper.
113 * New locales: nan_TW@latin, ks_IN
115 * Faster strlen, strchr, strchrnul, strrchr, memchr, and rawmemchr for x86-64.
116 Implemented by Ulrich Drepper.
118 * Extended printf hook support. It is possible to use user-defined types
119 and extend existing format specifiers.
120 Implemented by Ulrich Drepper.
122 * Handling for group shadow files has been added.
123 Implemented by Ulrich Drepper.
125 * DNS IPv4-IPv6 parallel lookup now deals better with broken DNS
126 servers (the case, e.g., for some people using the built-in DNS
127 server in ADSL modems/routers). There is a once-per-process timeout
128 in case of a broken server. To avoid it, users can run nscd or put
129 'options single-request' in /etc/resolv.conf.
130 Implemented by Ulrich Drepper.
135 * Unified lookup for getaddrinfo: IPv4 and IPv6 addresses are now looked
136 up at the same time. Implemented by Ulrich Drepper.
138 * TLS descriptors for LD and GD on x86 and x86-64.
139 Implemented by Alexandre Oliva.
141 * getaddrinfo now handles DCCP and UDPlite.
142 Implemented by Ulrich Drepper.
144 * New fixed-size conversion macros: htobe16, htole16, be16toh, le16toh,
145 htobe32, htole32, be32toh, le32toh, htobe64, htole64, be64toh, le64toh.
146 Implemented by Ulrich Drepper.
148 * New implementation of memmem, strstr, and strcasestr which is O(n).
149 Implemented by Eric Blake.
151 * New Linux interfaces: inotify_init1, dup3, epoll_create1, pipe2
153 * Implement "e" option for popen to open file descriptor with the
154 close-on-exec flag set. Implemented by Ulrich Drepper.
156 * Implement "b" mode for fmemopen. In this mode writes writes don't
157 implicitly add a NUL byte and seeks from the end of the buffer really
158 use the buffer end, not the string length as the basis.
159 Implemented by Ulrich Drepper.
161 * Many functions, exported and internal, now atomically set the close-on-exec
162 flag when run on a sufficiently new kernel. Implemented by Ulrich Drepper.
164 * Sorting rules for some Indian languages (Kannada, Gurumukhi, Telugu,
166 Implemented by Pravin Satpute.
168 * New locales: sd_IN, sd_IN@devanagari, ks_IN@devanagari, ht_HT, en_AG, nl_AW.
172 * New locales: bo_CN, bo_IN, shs_CA.
174 * New encoding: HP-ROMAN9, HP-GREEK8, HP-THAI8, HP-TURKISH8.
176 * Sorting rules for some Indian languages (Devanagari and Gujarati).
177 Implemented by Pravin Satpute.
179 * IPV6 addresses in /etc/resolv.conf can now have a scope ID
181 * nscd caches now all timeouts for DNS entries
182 Implemented by Ulrich Drepper.
184 * nscd is more efficient and wakes up less often.
185 Implemented by Ulrich Drepper.
187 * More checking functions: asprintf, dprintf, obstack_printf, vasprintf,
188 vdprintf, and obstack_vprintf.
189 Implemented by Jakub Jelinek.
191 * Faster memset for x86-64.
192 Implemented by Harsha Jagasia and H.J. Lu.
194 * Faster memcpy on x86.
195 Implemented by Ulrich Drepper.
197 * ARG_MAX is not anymore constant on Linux. Use sysconf(_SC_ARG_MAX).
198 Implemented by Ulrich Drepper.
200 * Faster sqrt and sqrtf implemention for some PPC variants.
201 Implemented by Stephen Munroe.
205 * More checking functions: fread, fread_unlocked, open*, mq_open.
206 Implemented by Jakub Jelinek and Ulrich Drepper.
208 * Extend fortification to C++. Implemented by Jakub Jelinek.
210 * Implement 'm' modifier for scanf. Add stricter C99/SUS compliance
211 by not recognizing 'a' as a modifier when those specs are requested.
212 Implemented by Jakub Jelinek.
214 * PPC optimizations to math and string functions.
215 Implemented by Steven Munroe.
217 * New interfaces: mkostemp, mkostemp64. Like mkstemp* but allow additional
218 options to be passed. Implemented by Ulrich Drepper.
220 * More CPU set manipulation functions. Implemented by Ulrich Drepper.
222 * New Linux interfaces: signalfd, eventfd, eventfd_read, and eventfd_write.
223 Implemented by Ulrich Drepper.
225 * Handle private futexes in the NPTL implementation.
226 Implemented by Jakub Jelinek and Ulrich Drepper.
228 * Add support for O_CLOEXEC. Implement in Hurd. Use throughout libc.
229 Implemented by Roland McGrath and Ulrich Drepper.
231 * Linux/x86-64 vDSO support. Implemented by Ulrich Drepper.
233 * SHA-256 and SHA-512 based password encryption.
234 Implemented by Ulrich Drepper.
236 * New locales: ber_DZ, ber_MA, en_NG, fil_PH, fur_IT, fy_DE, ha_NG, ig_NG,
237 ik_CA, iu_CA, li_BE, li_NL, nds_DE, nds_NL, pap_AN, sc_IT, tk_TM, ug_CN,
240 + New iconv modules: MAC-CENTRALEUROPE, ISO-8859-9E, KOI8-RU.
241 Implemented by Ulrich Drepper.
245 * New Linux interfaces: epoll_pwait, sched_getcpu.
247 * New generic interfaces: strerror_l.
249 * nscd can now cache the services database. Implemented by Ulrich Drepper.
254 * For Linux, the sorting of addresses returned by getaddrinfo now also
255 handles rules 3, 4, and 7 from RFC 3484. I.e., all rules are handled.
256 Implemented by Ulrich Drepper.
258 * Allow system admin to configure getaddrinfo with the /etc/gai.conf file.
259 Implemented by Ulrich Drepper.
261 * New Linux interfaces: splice, tee, sync_file_range, vmsplice.
263 * New iconv module for MIK. Contributed by Alexander Shopov.
265 * For sites with broken group and/or passwd database, the auto-propagate
266 option of nscd can prevent creating ID lookup entries from the results
267 of a name lookup and vice versa. This usually is no problem but some
268 site might have problems with the default behavior.
269 Implemented by Ulrich Drepper.
271 * Iterating over entire database in NIS can be slow. With the
272 SETENT_BATCH_READ option in /etc/default/nss a system admin can decide
273 to trade time for memory. The entire database will be read at once.
274 Implemented by Ulrich Drepper.
276 * The interfaces introduced in RFC 3542 have been implemented by
279 * Support for the new ELF hash table format was added by Ulrich Drepper.
281 * Support for priority inheritance mutexes added by Jakub Jelinek and
284 * Support for priority protected mutexes added by Jakub Jelinek.
286 * New locales: nr_ZA, pa_PK, ca_AD, ca_FR, ca_IT, el_CY, tr_CY, as_IN,
287 or_IN, csb_PL, fy_NL, sr_ME.
291 * More overflow detection functions.
293 * New iconv converters for IBM1025, IBM1122, IBM1137, IBM1153,
294 IBM1154, IBM1155, IBM1156, IBM1157, and IBM1158 contributed by Jiro Sekiba.
296 More converters for IBM803, IBM901, IBM902, IBM921, IBM1008, IBM1097,
297 IBM1112, IBM1123, IBM1130, IBM1140, IBM1141, IBM1142, IBM1143, IBM1144,
298 IBM1145, IBM1146, IBM1147, IBM1148, IBM1149, IBM1166, IBM1167, IBM4517,
299 IBM4899, IBM4909, IBM4971, IBM5347, IBM9030, IBM9066, IBM9448, IBM12712,
300 IBM16804, IBM1364, IBM1371, IBM1388, IBM1390, and IBM1399 contributed
301 by Masahide Washizawa.
303 * It is now possible to install audit libraries for the dynamic linker using
304 LD_AUDIT. Implemented by Ulrich Drepper.
306 * The LinuxThreads add-on, providing pthreads on Linux 2.4 kernels, is no
307 longer supported. The new NPTL implementation requires Linux 2.6 kernels.
308 For a libc and libpthread that works well on Linux 2.4 kernels, we
309 recommend using the stable 2.3 branch.
311 * The new function open_wmemstream acts like open_memstream,
312 but uses a wchar_t wide character buffer.
314 * The new function ppoll is an improved version of poll, similar to pselect.
316 * New interfaces: fdopendir, openat, fstatat, fchmodat, fchownat,
317 futimesat, faccessat, mkdirat, mkfifoat, mknodat,
318 renameat, unlinkat, linkat, symlinkat, readlinkat.
320 * New Linux kernel system calls: unshare,
321 inotify_init, inotify_add_watch, inotify_rm_watch.
323 * The euidaccess function is now also known by the alias eaccess,
324 for compatibility with some other systems.
326 * Timezone data updated to 2006b version.
330 * The following bugs are resolved with this release:
332 38, 253, 549, 622, 653, 721, 758, 851, 877, 915, 934, 955, 961,
333 1016, 1037, 1076, 1079, 1080, 1081, 1082, 1083, 1084, 1085, 1086,
334 1087, 1088, 1090, 1091, 1092, 1093, 1094, 1095, 1096, 1097, 1098,
335 1099, 1100, 1101, 1102, 1103, 1104, 1105, 1106, 1107, 1108, 1109,
336 1110, 1111, 1112, 1113, 1125, 1137, 1138, 1249, 1250, 1251, 1252,
337 1253, 1254, 1350, 1358, 1394, 1438, 1498, 1534
339 Visit <http://sources.redhat.com/bugzilla/> for the details of each bug.
341 * As of this release, GCC 4 can be used to compile the C Library.
343 * Timezone data updated to 2005m version.
347 * The following bugs are resolved with this release:
349 284, 592, 602, 626, 633, 640, 650, 661, 671, 681, 693, 700, 710, 719,
350 722, 723, 725, 726, 727, 728, 729, 730, 731, 732, 733, 734, 735, 736,
351 737, 738, 739, 740, 741, 742, 743, 744, 745, 765, 767, 768, 769, 776,
352 777, 787, 821, 822, 823, 825
354 Visit <http://sources.redhat.com/bugzilla/> for the details of each bug.
358 * Support for RFC 3678. Real implementations exist only for Linux so far.
359 Implemented by Ulrich Drepper.
361 * nscd can now cache entries persistently. Expiring entries are reloaded.
362 For speedups the cache can be shared in memory with client processes.
363 Implemented by Ulrich Drepper.
365 * nscd can now perform SELinux checks.
366 Implemented by Matthew Rickard <mjricka@epoch.ncsc.mil>.
368 * getaddrinfo queries are now cached. Canonical name lookup is performed
370 Implemented by Ulrich Drepper.
372 * The nothrow function attribute is used when headers are used by gcc when
373 compiling C code. This can avoid significant amounts of exception
376 * The malloc functions perform more error checking and are stricter when
377 it comes to reacting on errors. The default action is to terminate
378 the process after showing an error message. Implemented by Ulrich Drepper.
380 * Reverse lookups of IPv6 addresses does not use bit string or .ip6.int
381 lookups anymore unless explicitly requested. Implemented by Ulrich Drepper.
383 * Namespaces in ld.so are implemented. DSOs can be loaded in separate
384 namespaces using the new function dlmopen(). This feature is of course,
385 like most other dynamic loading functionality, not available in statically
386 linked applications. Implemented by Ulrich Drepper.
388 * Low-overhead boundary checking variants of string and some stdio functions
389 were added. These are to be used in conjunction with a gcc patch by
390 Jakub Jelinek which adds calls to these functions if possible.
391 Implemented by Jakub Jelinek and Ulrich Drepper.
393 * Old code for several operating systems and machine architectures that
394 have not been in working condition in a long time have been removed from
395 the main source tree maintained by the GNU C Library's maintainers.
396 These files are now reside in the separate `ports' source module
397 that is usable as an add-on when building the library.
401 * New functions `dladdr1' and `dlinfo' in <dlfcn.h> provide more ways to
402 interrogate the dynamic linker, compatible with the Solaris interface.
404 * ELF thread-local storage support (TLS) now works on PowerPC and PowerPC64;
405 implemented by Paul Mackerras, Steven Munroe, and Roland McGrath.
407 * getifaddrs now uses the netlink interface on Linux to get its information.
408 Implemented by Thorsten Kukuk.
410 * getaddrinfo now implements AI_V4MAPPED, AI_ALL, and AI_ADDRCONF.
411 Implemented by Ulrich Drepper.
413 * support for non-executable stacks on x86 has been added. Changes mostly
416 * regex is now much faster for multibyte locales. Changes by Jakub Jelinek
419 * getaddrinfo now performs destination address selection according to
424 * Thread-safe interfaces for many functions that access locale data
425 were added in version 2.3, but these features were omitted from NEWS.
426 Many functions have variants with an `_l' suffix that take a `locale_t'
427 object as a parameter rather than consulting the current locale.
428 The new functions `newlocale', `duplocale', and `freelocale' in <locale.h>
429 create and maintain `locale_t' objects. Additionally, the new function
430 `uselocale' sets "the current locale" (as used by functions not so
431 parameterized) set for an individual thread. These features were added
432 in version 2.3, implemented by Ulrich Drepper and Roland McGrath.
434 * The functions getresuid, getresgid, setresuid, and setresgid, which
435 have long been available on Linux, are now declared in <unistd.h>
436 and are now also available on the Hurd.
438 * ELF thread-local storage support (TLS) now works on x86-64.
440 * The new dynamic string token $LIB is expanded in shared library names.
441 This normally expands to lib, but on some 64-bit platforms to lib64 instead.
443 * Aldy Hernandez contributed complete software floating point support for
444 PowerPC machines with no FPU.
446 * fexecve is implemented on Linux.
448 * The `btowc' function should work at least twice as fast due to
449 specialized callbacks in the iconv modules. Implemented by Bruno Haible.
451 * With approriate thread add-ons cancelable functions are now implemented
452 in libc.so as well. No need to call the function in libpthread. This
453 change allowed to finally disable the incorrect and expensive handling
454 of weak definition in ld.so.
456 * Yet more PLT entries in libc.so have been removed. We finally arrived
457 at the bare minimum. Startup times improved appropriately.
459 * Support for the new Linux/x86 system call interface was added. The
460 AT_SYSINFO auxiliary vector entry is recognized and handled.
464 * Masahide Washizawa contributed iconv modules for IBM1163 and IBM1164
467 * iconv (the program and the interface) now accepts empty names (excluding
468 options like //TRANSLIT) to mean "use charset of current locale".
470 * localedef can now transliterate characters in strings which are not in
471 the provided charmap. The information from the input locale is used.
473 * Prelinking support was added for ELF targets. This requires additional
474 tools and recent versions of the GNU binutils. Contributed by Jakub Jelinek.
476 * Read-only stdio streams now use mmap to speed up operation by eliminating
477 copying and buffer underflows. To use add 'm' to the mode string of
478 the fopen/fdopen/freopen call. Implemented by Ulrich Drepper.
480 * The malloc functions were completely rewritten by Wolfram Gloger based
481 on Doug Lea's malloc-2.7.0.c.
483 * Isamu Hasegawa contributed a completely new and POSIX-conformant
484 implementation of regex.
486 * Bruno Haible upgraded the iconv and locale implementation to support
489 * Contents of the LC_* and LANG environment variables in the CEN style are
490 not recognized anymore. It never was used. Change by Ulrich Drepper.
492 * The runtime (ld.so, libc, libpthread for Linux) now can handle the ELF
493 thread-local storage (TLS) ABI on some platforms.
494 Changes by Ulrich Drepper. SH support by Kaz Kojima.
496 * Bruno Haible contributed iconv converters for ISO-2022-JP-3, SHIFT JIS-X0213,
497 EUC-JISX0213, and TSCII.
499 * New header <ifaddrs.h> with functions `getifaddrs' and `freeifaddrs':
500 BSD-compatible interface for getting all network interface addresses.
501 Implementation for IPv4 by Roland McGrath.
503 * Loading of locale data is faster due to the introduction of a locale
504 archive. Implemented by Roland McGrath and Ulrich Drepper.
506 * Startup times are significantly reduced by not using exported functions
507 inside the library itself. Changes by Jakub Jelinek, Roland McGrath,
510 * Steven Munroe contributed a port to PowerPC64/Linux.
514 * The Hurd now uses the GNU libio implementation of stdio rather than the
515 old GNU stdio implementation, and uses a new ABI (libc.so.0.3).
517 * The Hurd on x86 now has the `ioperm' function and <sys/io.h> header file
518 with the same behavior as the Linux system call of the same name.
522 * Stephen Moshier implemented log2, log10, powl and cbrtl for the
523 128-bit long double format.
525 * Masahide Washizawa contributed iconv modules for IBM1132, IBM1133, IBM1160,
526 IBM1161, and IBM1162 charsets.
528 * Andreas Jaeger contributed a port to x86-64/Linux.
530 * Peter Bruin contributed a port to PowerPC/Hurd.
532 * libc functions using I/O streams now can handle wide-oriented streams
535 * optimizations in the dynamic linker. Binaries created by recent binutils
536 versions start up quicker due to reduced time spent on relocations.
538 * Support for use of gcc3 added by Jakub Jelinek and HJ Lu.
542 * Stephen Moshier implemented cosh, expm1, log1p, acos, sinh, tanh,
543 asinh, atanh, j0 for the 128-bit long double format.
545 * Bruno Haible updated all the code handling Unicode in some form to
548 * Speed of regex for single-byte locales is back to previous levels.
549 Patch by Isamu Hasegawa.
551 * Alpha, SPARC, and IA-64 now also using floating stacks.
553 * Startup time of internationalized applications greatly improved through
554 iconv cache. Use iconvconfig to generate the cache file.
555 Contributed by Ulrich Drepper.
557 * The IA-64 specific part of ld.so was rewritten to eliminate some pretty
558 severe performance problems. Patch by David Mosberger.
560 * The Hurd port got a lot more functionality like AIO, various stdio
561 extensions, etc. Mainly done by Roland McGrath.
563 * mtrace can now lookup symbols in shared libraries.
567 * Intel's IA-64 math library is largely integrated. It provides fast and
568 accurate implementatations for most basic and standard math functions
569 in float, double, and long double format.
571 * Stephen Moshier implemented j0, j1, jn, y0, y1, yn, lgamma, erf, erfc,
572 and asin for the 96-bit long double format and asin, log, tan for the
573 128-bit long double format.
575 * The beginning of a last-bit accurate math library by IBM Haifa were added.
576 The basic double functions exist today. Contributed by Abraham Ziv
577 <ziv@il.ibm.com>, Moshe Olshansky <olshansk@il.ibm.com>, Ealan Henis
578 <ealan@il.ibm.com>, and Anna Reitman <reitman@il.ibm.com>.
580 * An asynchronous name lookup library was added. The interface is designed
581 after POSIX AIO. The proposal was circulated beforehand to get comments.
582 No negative ones came in. Implemented by Ulrich Drepper.
584 * Port to S390/64bit contributed by Martin Schwidefsky
585 <schwidefsky@de.ibm.com>.
587 * David Mosberger <davidm@hpl.hp.com> implemented the setcontext family
588 of functions for Linux/IA-64.
590 * The RPC code is now thread safe. Threads can now use the same service
591 of different services at the same time. Patch by Eric Norum
592 <eric.norum@usask.ca> with some help by Ulrich Drepper.
594 * Martin Schwidefsky <schwidefsky@de.ibm.com> implemented the setcontext
595 family of functions for Linux/S390.
597 * Ulrich Drepper <drepper@redhat.com> implemented the setcontext family
598 of functions for Linux/x86.
600 * Port to Linux/CRIS contributed by Axis Communications.
604 * Lots of headers were cleaned up. Using the tool in the conform/ subdir
605 we can now check for namespace violations and missing declarations. The
606 result is that almost all headers are now Unix-compliant (as defined in
607 the upcoming XPG6). The negative side is that some programs might need
608 corrections, too, if they depend on the incorrect form of the headers in
609 previous versions which defined too many symbols and included too many
612 * regex now handles multibyte character sets correctly.
613 Contributed by Isamu Hasegawa <isamu@yamato.ibm.com>.
615 * iconv (the program) does now conform to the upcoming XPG6 and handles
616 charmaps. Instead of the charset names the path of charmaps can be
617 provided and the conversion happens based on this data.
618 Contributed by Ulrich Drepper.
620 * The locale program now provides detailed information about the installed
625 only lists the names of the supported locales
629 provides details such as country, language, and codeset name.
630 Contributed by Ulrich Drepper.
634 * The gencat program now parses the input file according to the charset
635 selected by the LC_CTYPE category. This is important for stateful
636 character sets. To make generating catalogs easier there is a way
637 to overwrite the charset selected by the locale: before the first
638 message or $ quote line the catalog can contain a line like
642 to select the charset (ISO-8859-2 in this case).
644 Implemented by Shinya Hanataka and Ulrich Drepper.
646 * New codeset conversion modules: IBM-922 (Estonia PC codeset),
647 IBM-1124 (Ukraine PC codeset), IBM-1129 (Vietnamese PC codeset).
648 Contributed by Masahide Washizawa <washi@jp.ibm.com>.
650 * Optimized string functions for Alpha ev6 and ev67 by Richard Henderson
651 <rth@redhat.com> and Rick Gorton <rick.gorton@alpha-processor.com>.
653 * The LANGUAGE environment variable is now ignored unless the locale is
654 changed from the default "C" locale.
656 * The usual bug fixes.
660 * Greg McGary added runtime support for bounds checking using gcc's
661 new -fbounded-pointers option. ix86 target is complete. PowerPC
664 * Thorsten Kukuk added secure mode support to nscd.
666 * The Berkeley db libraries have been removed.
668 Related, the nss_db module is now in a separate package since it
669 obviously requires a database library being available.
671 * Wide character I/O streams implemented by Ulrich Drepper.
673 * Functions from the extended socket API added by Ulrich Drepper.
675 * Functions feenableexcept and fedisableexcept to control the
676 behaviour of individual exceptions have been added by Andreas Jaeger.
678 * ldconfig program added by Andreas Jaeger and Jakub Jelinek.
680 * The resolver code has been updated from bind 8.2.3-T5B which supports
681 threads. The integration was done by Andreas Jaeger, Adam D. Bradley,
684 This change could in some situations effect backward compatibility. Since
685 now `_res' is a thread-local instead of a global variable, modifying it
686 in one thread does not have any effect in other threads.
688 The resolver library was also extended to allow IPv6 as the transport
689 protocol for the requests. This work was done by Stig Venaas.
691 * Compatibility code for K&R C compilers has been removed from the
692 header files. A ISO C compiler is needed to use the library
693 (conforming to either C89 or C99 standard).
695 * Complete rewrite of the localedef program to support multibyte character
696 sets. Implement handling of ISO 14651 and ISO 14652. Rewrite strcoll,
697 strxfrm, wcscoll, and wcsxfrm functions. Make isw*() functions work.
698 Implemented by Ulrich Drepper.
700 Bruno Haible significantly improved the generation and use of the data
701 structures for the wide character tables.
703 * Plural handling in gettext implemented by Ulrich Drepper.
705 * The utmp daemon has been removed.
707 * The port to MIPS-Linux has been finished by Andreas Jaeger.
709 * A port to Hitachi SH3 and SH4 has been contributed by Kazumoto Kojima
712 * POSIX clocks and timers implemented by Kaz Kylheku and Ulrich Drepper.
714 * POSIX barriers implemented by Kaz Kylheku.
716 * POSIX spawn function family implemented by Ulrich Drepper.
718 * POSIX spinlocks are now available.
720 * Timed wait functions for mutex, rwlock, and semaphores are implemented.
722 * the configure option --enable-kernel=X.Y.Z allows to strip out
723 compatibility for kernel versions before X.Y.Z. This is currently only
724 implemented for Linux.
726 * the sockaddr_in6 structure changed. The IPv6 working group added a new
727 field sin6_scope_id. This means that all programs using IPv6 should be
728 recompiled. Don't expect binary compatibility with previous glibc
731 * various conversion modules for IBM character sets contributed by
734 * IA-64 port by Jes Sorensen and HJ Lu.
736 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
737 Compiling the GNU C Library for Linux/ia64
738 ******************************************
740 Please refer to the file INSTALL in the same directory as you found
741 this file for general information about configuring and compiling
744 For general inquiries about glibc under Linux/ia64 please use the
745 following mailing list linux-ia64@linuxia64.org or one of the relevant
748 Recommended Tools for Compilation
749 =================================
751 In order for glibc-2.2 to build correctly on the ia64 you need at
752 least the following versions of the GNU tools (the :
754 * The Cygnus toolchain snapshot for the ia64 as of August 4
755 including the provided set of patches. It is however recommend
756 you use the October 24 toolchain snapshot or a more recent version.
758 OR alternatively you can try the following (the Cygnus toolchain is
759 the recommended solution):
761 * GCC and binutils, GAS and GNU LD out of CVS from
762 sources.redhat.com as of August 28, 2000 or later. The CVS tree
763 may require special patches to work properly on the ia64.
765 Configuring and compiling GNU Libc for Linux/ia64
766 =================================================
768 The library requires Linux kernel version 2.4.0-test4-000728 or
769 later to funtion properly. Besides that it support for debug libraries
770 is currently untested. Hence the following options
771 are required for configuring the library:
773 --disable-debug --enable-kernel=2.4.0
775 It is also important that you make sure the library picks up the
776 appropriate kernel header files, if you do not have recent enough
777 kernel headers in /usr/src/linux/include, you should use the
778 --with-headers=<path> option to specify the location.
780 As an example I personally use the following options to configure
785 --enable-kernel=2.4.0
789 --with-headers=/home/jes/linux/include
794 Jes Sorensen <jes@linuxcare.com>,
796 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
810 * New ISO C 9x function _Exit, imaxabs, and imaxdiv are added.
812 * New xdr functions are added; some rpc functions are now 64bit clean.
814 * Fixed a number of bugs and memory leaks (especially in NIS+ code).
816 * Fixed known incompatibilities with glibc 2.0.
818 * New functions lock64, strchrnul, rawmemchr, getutmp and getutmpx.
820 * Optimized a number of functions (especially the ELF dynamic loader).
822 * Update timezone data files.
824 * lots of charmaps corrections
826 * some new locale definitions and charmaps
831 * Richard Henderson corrected size of struct timeval on Linux/Alpha to
832 conform to POSIX member type requirements. Symbol versions have been
833 adjusted as needed within the library, and for direct use by applications,
834 but there is potential for problems if third-party libraries use
835 struct timeval as part of their interface. This does not present
836 a problem for X and other "essential" system libraries.
838 * An additional locale model to support C++ Standard Library locale
839 model and probably more was implemented by Ulrich Drepper.
841 * Eric Youngdale and Ulrich Drepper implemented versioning of objects on
844 * Miles Bader provided the `argp' function family to support hierachical
845 command line argument parsing, layered on top of getopt.
847 * strtod accepts new hexadecimal floating-point format from ISO C 9X.
849 * printf has two new specifiers %a and %A to print hexadecimal flaoting-point
852 * scanf recognizes the %a and %A format for scanning floating point numbers.
854 * the new headers <stdint.h> and <inttypes.h> from ISO C 9X provides
855 information and interfaces for the available integer types.
857 * about 130 new math functions were added to implement the ISO C9x math
860 * the new header <complex.h> contains definitions of the complex math
861 functions from ISO C 9X.
863 * the new header <tgmath.h> defines generic macros to use complex or
864 real valued functions.
866 * Thorsten Kukuk provided an implementation for NIS+, securelevel 0, 1 and 2.
868 * Andreas Jaeger provided a test suite for the math library.
870 * Mark Kettenis implemented the utmpx interface and an utmp daemon.
872 * Ulrich Drepper added character set conversion functions (iconv).
874 * Optimized string functions have been added.
876 * The localedata addon is now part of glibc.
878 * An implementation of profiling shared libraries was added by Ulrich Drepper.
880 * Thorsten Kukuk and Ulrich Drepper provided an implementation for a caching
881 daemon for NSS (nscd).
883 Missing a better place here are some numbers on improvements. Under
884 Linux 2.1.125 un-tar-ing the kernel sources takes
888 using local files 12.19s 6.88s 22.91s
890 using NIS 13.92s 8.91s 26.34s
892 using NIS & nscd 10.37s 7.34s 25.30s
894 using NIS+ 27.57s 30.37s 640.46s
896 using NIS+ & nscd 10.25s 7.83s 26.51s
898 using NIS & old nscd [1] 13.83s 8.32s 29.60s
900 Keep in mind that non-namelookup related operations dominate above times.
901 It was just a common complain that using NIS+ unpacking the kernel is
904 [1] The old nscd implementation is not available anymore since it was
905 distributed with glibc up to version 2.0.98 and thus is now replaced.
907 * Tim Waugh provided an implementation of the POSIX.2 wordexp function family.
909 * Mark Kettenis provided a Hesiod NSS module.
911 * The ELF dynamic loader knows how to process dynamic string tokens ($ORIGIN
912 and $PLATFORM) in RPATHs and similar strings (Ulrich Drepper).
914 * rcmd can now handle netgroups (Dick Streefland).
916 * A port to the ARM was contributed by Phil Blundell, Pat Beirne and Scott
919 * Support for the IPv6 protocol has been added to the socket API, as per the
920 latest draft standards.
922 * Support for Linux 2.2 has been added.
924 * Interface changes relative to the latest 2.0.x release:
925 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
926 addseverity NEW: Unix98
928 argp_err_exit_status NEW: argp, GNU ext
929 argp_error NEW: argp, GNU ext
930 argp_failure NEW: argp, GNU ext
931 argp_help NEW: argp, GNU ext
932 argp_parse NEW: argp, GNU ext
933 argp_program_bug_address NEW: argp, GNU ext
934 argp_program_version NEW: argp, GNU ext
935 argp_program_version_hook NEW: argp, GNU ext
936 argp_state_help NEW: argp, GNU ext
937 argp_usage NEW: argp, GNU ext
938 authdes_create NEW: Secure RPC
939 authdes_getucred NEW: Secure RPC
940 authdes_pk_create NEW: Secure RPC
941 backtrace NEW: GNU ext.
942 backtrace_symbols NEW: GNU ext.
943 backtrace_symbols_fd NEW: GNU ext.
947 cacoshf NEW: ISO C 9x
948 cacoshl NEW: ISO C 9x
958 casinhf NEW: ISO C 9x
959 casinhl NEW: ISO C 9x
964 catanhf NEW: ISO C 9x
965 catanhl NEW: ISO C 9x
967 cbc_crypt NEW: Secure RPC
980 clearerr_locked REMOVED
981 clntunix_create NEW: sunrpc ext
984 clog10f NEW: ISO C 9x
985 clog10l NEW: ISO C 9x
1004 csinhf NEW: ISO C 9x
1005 csinhl NEW: ISO C 9x
1008 csqrtf NEW: ISO C 9x
1009 csqrtl NEW: ISO C 9x
1013 ctanhf NEW: ISO C 9x
1014 ctanhl NEW: ISO C 9x
1016 des_setparity NEW: Secure RPC
1017 ecb_crypt NEW: Secure RPC
1018 endutxent NEW: Unix98
1020 exp10f NEW: ISO C 9x
1021 exp10l NEW: ISO C 9x
1025 fattach NEW: STREAMS
1026 fdetach NEW: STREAMS
1030 feclearexcept NEW: ISO C 9x
1031 fegetenv NEW: ISO C 9x
1032 fegetexceptflag NEW: ISO C 9x
1033 fegetround NEW: ISO C 9x
1034 feholdexcept NEW: ISO C 9x
1036 feraiseexcept NEW: ISO C 9x
1037 ferror_locked REMOVED
1038 fesetenv NEW: ISO C 9x
1039 fesetexceptflag NEW: ISO C 9x
1040 fesetround NEW: ISO C 9x
1041 fetestexcept NEW: ISO C 9x
1042 feupdateenv NEW: ISO C 9x
1043 fflush_locked REMOVED
1047 fgets_unlocked NEW: GNU ext.
1048 fileno_locked REMOVED
1060 fputc_locked REMOVED
1061 fputs_unlocked NEW: GNU ext.
1062 fread_unlocked NEW: GNU ext.
1067 fstatvfs NEW: Unix98
1071 ftruncate64 NEW: LFS
1073 fwrite_unlocked NEW: GNU ext.
1074 gai_strerror NEW: IPv6
1078 getchar_locked REMOVED
1080 getdate_err NEW: Unix98
1081 getdate_r NEW: GNU ext.
1083 getnameinfo NEW: IPv6
1084 getnetname NEW: Secure RPC
1085 getpmsg NEW: STREAMS
1086 getpt NEW: Unix98 PTY
1087 getrlimit64 NEW: LFS
1088 getutxent NEW: Unix98
1089 getutxid NEW: Unix98
1090 getutxline NEW: Unix98
1091 glob64 NEW: GNU ext.
1092 globfree64 NEW: GNU ext.
1093 gnu_get_libc_release NEW: GNU ext.
1094 gnu_get_libc_version NEW: GNU ext.
1095 grantpt NEW: Unix98 PTY
1096 host2netname NEW: Secure RPC
1098 iconv_close NEW: iconv
1099 iconv_open NEW: iconv
1100 if_freenameindex NEW: IPv6
1101 if_indextoname NEW: IPv6
1102 if_nameindex NEW: IPv6
1103 if_nametoindex NEW: IPv6
1104 in6addr_any NEW: IPv6
1105 in6addr_loopback NEW: IPv6
1106 inet6_isipv4mapped NEW: IPv6
1107 isastream NEW: STREAMS
1108 iswblank NEW: GNU ext.
1109 key_decryptsession NEW: Secure RPC
1110 key_decryptsession_pk NEW: Secure RPC
1111 key_encryptsession NEW: Secure RPC
1112 key_encryptsession_pk NEW: Secure RPC
1113 key_gendes NEW: Secure RPC
1114 key_get_conv NEW: Secure RPC
1115 key_secretkey_is_set NEW: Secure RPC
1116 key_setnet NEW: Secure RPC
1117 key_setsecret NEW: Secure RPC
1118 llrint NEW: ISO C 9x
1119 llrintf NEW: ISO C 9x
1120 llrintl NEW: ISO C 9x
1121 llround NEW: ISO C 9x
1122 llroundf NEW: ISO C 9x
1123 llroundl NEW: ISO C 9x
1128 lrintf NEW: ISO C 9x
1129 lrintl NEW: ISO C 9x
1130 lround NEW: ISO C 9x
1131 lroundf NEW: ISO C 9x
1132 lroundl NEW: ISO C 9x
1134 makecontext NEW: Unix98
1135 mempcpy NEW: GNU ext.
1138 modify_ldt NEW: kernel
1142 nearbyint NEW: ISO C 9x
1143 nearbyintf NEW: ISO C 9x
1144 nearbyintl NEW: ISO C 9x
1145 netname2host NEW: Secure RPC
1146 netname2user NEW: Secure RPC
1147 nexttoward NEW: ISO C 9x
1148 nexttowardf NEW: ISO C 9x
1149 nexttowardl NEW: ISO C 9x
1153 passwd2des NEW: Secure RPC
1155 pow10f NEW: GNU ext.
1156 pow10l NEW: GNU ext.
1159 printf_size NEW: GNU ext.
1160 printf_size_info NEW: GNU ext.
1161 profil_counter REMOVED
1162 pthread_mutexattr_getkind_np REPLACED
1163 pthread_mutexattr_setkind_np REPLACED
1164 ptsname NEW: Unix98 PTY
1165 ptsname_r NEW: Unix98 PTY
1167 putchar_locked REMOVED
1168 putgrent NEW: GNU ext.
1170 putpmsg NEW: STREAMS
1171 pututxline NEW: Unix98
1175 readdir64_r NEW: LFS
1176 remquo NEW: ISO C 9x
1177 remquof NEW: ISO C 9x
1178 remquol NEW: ISO C 9x
1180 roundf NEW: ISO C 9x
1181 roundl NEW: ISO C 9x
1183 scalbln NEW: ISO C 9x
1184 scalblnf NEW: ISO C 9x
1185 scalblnl NEW: ISO C 9x
1187 sendfile NEW: kernel
1188 setcontext NEW: Unix98
1189 setrlimit64 NEW: LFS
1190 setutxent NEW: Unix98
1192 sigignore NEW: Unix98
1193 sigqueue NEW: POSIX.1b
1194 sigrelse NEW: Unix98
1195 sigset NEW: POSIX.1b
1196 sigtimedwait NEW: POSIX.1b
1197 sigwaitinfo NEW: POSIX.1b
1198 sincos NEW: GNU ext.
1199 sincosf NEW: GNU ext.
1200 sincosl NEW: GNU ext.
1204 strcasestr NEW: GNU ext.
1205 strtoimax NEW: ISO C 9x
1206 strtoumax NEW: ISO C 9x
1207 strverscmp NEW: GNU ext.
1208 svcauthdes_stats NEW: Secure RPC
1209 svcunix_create NEW: sunrpc etx
1210 svcunixfd_create NEW: sunrpc ext
1211 swapcontext NEW: Unix98
1212 tcgetsid NEW: Unix98 PTY
1213 tdestroy NEW: GNU ext.
1214 tgamma NEW: ISO C 9x
1215 tgammaf NEW: ISO C 9x
1216 tgammal NEW: ISO C 9x
1220 truncf NEW: ISO C 9x
1221 truncl NEW: ISO C 9x
1223 unlockpt NEW: Unix98 PTY
1224 updwtmpx NEW: Unix98
1225 user2netname NEW: Secure RPC
1226 utmpxname NEW: Unix98
1227 versionsort NEW: GNU ext.
1228 versionsort64 NEW: GNU ext.
1230 wcscasecmp NEW: GNU ext.
1231 wcsncasecmp NEW: GNU ext.
1232 wcsnlen NEW: GNU ext.
1233 wcstoimax NEW: ISO C 9x
1234 wcstoll NEW: ISO C 9x
1235 wcstoull NEW: ISO C 9x
1236 wcstoumax NEW: ISO C 9x
1238 wordexp NEW: POSIX.2
1239 wordfree NEW: POSIX.2
1240 write_profiling REMOVED
1241 xdecrypt NEW: Secure RPC
1242 xdr_authdes_cred NEW: Secure RPC
1243 xdr_authdes_verf NEW: Secure RPC
1244 xdr_cryptkeyarg NEW: Secure RPC
1245 xdr_cryptkeyarg2 NEW: Secure RPC
1246 xdr_cryptkeyres NEW: Secure RPC
1247 xdr_getcredres NEW: Secure RPC
1248 xdr_key_netstarg NEW: Secure RPC
1249 xdr_key_netstres NEW: Secure RPC
1250 xdr_keybuf NEW: Secure RPC
1251 xdr_keystatus NEW: Secure RPC
1252 xdr_netnamestr NEW: Secure RPC
1253 xdr_sizeof NEW: Secure RPC
1254 xdr_unixcred NEW: sunrpc ext
1255 xencrypt NEW: Secure RPC
1256 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
1267 * inet_ntoa is thread-safe
1269 * updwtmp is moved from libutil to libc
1271 * rewrite of cbrt function
1273 * update of timezone data
1287 * add atoll function
1289 * fix complex problems in Berkeley DB code
1291 * fix math functions
1295 * fixed lots of header problems (especially Linux/GNU specific)
1297 * dynamic loader preserves all registers
1299 * Roland McGrath provided support for handling of auxiliary objects in
1300 the ELF dynamic loader.
1302 * support for parallel builds is improved
1306 * GNU extensions are no longer declared by default. To enable them you
1307 must define the macro `_GNU_SOURCE' in your program or compile with
1310 * The library has changed from using GNU ld symbol aliases to using weak
1311 symbols where available. The ELF object file format supports weak
1312 symbols; GNU ld also supports weak symbols in the a.out format. (There
1313 is also now support for other GNU ld extensions in ELF. Use the
1314 `--with-elf' option to configure to indicate you have ELF, and
1315 `--with-gnu-ld' if using GNU ld.) This change resulted in the deletion
1316 of many files which contained only symbol aliases, reducing the size of
1317 the source and the compiled library; many other files were renamed to
1318 less cryptic names previously occupied by the symbol alias files.
1319 There is a new header file <elf.h> for programs which operate on
1320 files in the ELF format.
1322 * Converted to Autoconf version 2, so `configure' has more options.
1323 Run `configure --help' to see the details.
1325 * The library can now be configured to build profiling, highly-optimized
1326 (but undebuggable), and/or shared libraries (ELF with GNU ld only). The
1327 `--enable-profile', `--enable-omitfp', and `--enable-shared' options to
1328 `configure' enable building these extra libraries. The shared library is
1329 built by default when using both ELF and GNU ld. When shared libraries
1330 are enabled, the new library `-ldl' is available for arbitrary run-time
1331 loading of shared objects; its interface is defined in <dlfcn.h>. The
1332 new header file <link.h> gives access to the internals of the run-time
1333 dynamic linker, `ld.so'. The shell script `ldd' is similar to the
1334 application of same name on other systems and it provides information
1335 about dynamically linked binaries.
1337 * The C library now provides the run-time support code for profiling
1338 executables compiled with `-pg'. Programs can control the profiling code
1339 through the interface in <sys/gmon.h>. The `gmon.out' files written by
1340 the GNU C library can be read only by GNU `gprof' (from GNU binutils);
1341 the support for this file format was contributed by David Mosberger-Tang.
1343 * The math code has been replaced with a math library based on fdlibm from
1344 Sun, and modified by JT Conklin and Ulrich Drepper with i387 support, by
1345 Ian Taylor with `float' functions and by Ulrich Drepper with `long double'
1346 functions. The math functions now reside in a separate library, so
1347 programs using them will need to use `-lm' their linking commands.
1349 * John C. Bowman contributed optimized ix87 assembler inline functions.
1351 * Ulrich Drepper has contributed support for an `/etc/nsswitch.conf'
1352 mechanism similar to that found in Solaris 2. This is now used for the
1353 group, passwd, hosts, networks, services, protocols, rpc, ethers,
1354 shadow, netgroup, publickey, and alias databases. The `nsswitch.conf'
1355 file controls what services are used for each individual database. This
1356 works by loading shared libraries with names specified in `nsswitch.conf',
1357 so service modules can be changed or added at any time without even
1358 relinking any program. Currently there are the file, db, and NIS based
1359 NSS services available.
1361 * The new functions `strtoq' and `strtouq' parse integer values from
1362 strings, like `strtol' and `strtoul', but they return `long long int' and
1363 `unsigned long long int' values, respectively (64-bit quantities).
1365 * The new functions `strtof' and `strtold' parse floating-point values from
1366 strings, like `strtod', but they return `float' and `long double' values,
1367 respectively (on some machines `double' and `long double' are the same).
1369 * Ulrich Drepper has contributed new implementations of the floating-point
1370 printing and reading code used in the `printf' family of functions and
1371 `strtod', `strtof', and `strtold'. These new functions are perfectly
1372 accurate, and much faster than the old ones.
1374 * The implementation of the POSIX locale model was completely rewritten by
1375 Ulrich Drepper. This includes the new programs `localedef' and `locale'
1376 to compile the POSIX locale definition.
1378 * The former dummy implementations of the strcoll and strxfrm function are
1379 now replaced by fully functional code contributed by Ulrich Drepper. The
1380 collation information comes from the POSIX locale definitions.
1382 * The new header <langinfo.h> defines an interface for accessing
1383 various locale-dependent data (using the locale chosen with `setlocale').
1385 * Ulrich Drepper has contributed a new suite of functions for operation on
1386 wide-character and multibyte-character strings, in <wchar.h>;
1387 and classification and case conversion of wide characters, in <wctype.h>.
1388 These new functions are conforming to the ISO C, Amendement 1 specification.
1390 * There is now a second implementation of the standard I/O library available.
1391 It comes from GNU libg++ as was written by Per Bothner, heavily modified
1392 by Hongjiu Lu and made thread safe by Ulrich Drepper.
1394 * You can now use positional parameter specifications in format strings
1395 for the `printf' and `scanf' families of functions. For example,
1396 `printf ("Number %2$d, Mr %1$s\n", "Jones", 6);'' prints
1397 ``Number 6, Mr Jones''. This is mainly useful when providing different
1398 format strings for different languages, whose grammars may dictate
1399 different orderings of the values being printed. To support this
1400 feature, the interface for `register_printf_handler' has changed; see
1401 the header file <printf.h> for details.
1403 * The `printf' and `scanf' families of functions now understand a new
1404 formatting flag for numeric conversions: the ' flag (e.g. %'d or %'f) says
1405 to group numbers as indicated by the locale; for `scanf' and friends, this
1406 says to accept as valid only a number with all the proper grouping
1407 separators in the right places. In the default "C" locale, numbers are
1408 not grouped; but locales for specific countries will define the usual
1409 conventions (i.e. separate thousands with `,' in the US locale).
1411 * The pgrp functions have been regularized, slightly incompatibly but much
1412 less confusingly. The core functions are now `getpgid' and `setpgid',
1413 which take arguments for the PID to operate on; the POSIX.1 `getpgrp' (no
1414 argument) and BSD `setpgrp' (identical to `setpgid') functions are
1415 provided for compatibility. There is no longer an incompatible `getpgrp'
1416 with an argument declared under _BSD_SOURCE; no BSD code uses it.
1418 * The new header file <fts.h> and suite of functions simplify programs that
1419 operate on directory trees. This code comes from 4.4 BSD.
1421 * The resolver code has been updated from the BIND 4.9.5-P1 release.
1422 Parts of the code were heavily modified by Ulrich Drepper to fit in the
1423 NSS scheme used in glibc.
1425 * There is a new malloc debugging hook `__memalign_hook'.
1427 * There are new typedefs `ushort' for `unsigned short int' and `uint' for
1428 `unsigned int' in <sys/types.h>. These are for compatibility only and
1429 their use is discouraged.
1431 * The `-lmcheck' library to enable standard malloc debugging hooks is now
1432 done differently, so that it works even without GNU ld.
1434 * New function `euidaccess' checks allowed access to a file like `access',
1435 but using the effective IDs instead of the real IDs.
1437 * The time zone data files have been updated for the latest and greatest
1438 local time conventions of the countries of the world.
1440 * The new function `dirfd' extracts the file descriptor used by a DIR stream;
1443 * The new functions `ecvt', `fcvt', and `gcvt' provide an obsolete interface
1444 for formatting floating-point numbers. They are provided only for
1445 compatibility; new programs should use `sprintf' instead. There are
1446 also equivalent function for the `long double' floating-point type and
1447 all functions also exist in a reentrant form.
1449 * The new auxiliary library `-lutil' from 4.4 BSD contains various
1450 functions for maintaining the login-record files (primarily of use to
1451 system programs such as `login'), and convenient functions for
1452 allocating and initializing a pseudo-terminal (pty) device.
1454 * Ulrich Drepper has contributed new support for System V style
1455 shared memory and IPC on systems that support it.
1457 * Ulrich Drepper has contributed several miscellaneous new functions found
1458 in System V: The `hsearch' family of functions provide an effective
1459 implementation of hash tables; `a64l' and `l64a' provide a very simple
1460 binary to ASCII mapping; `drand48' and friends provide a 48-bit random
1463 * Ulrich Drepper has contributed new reentrant counterparts for the
1464 `random' and `hsearch' families of functions; `random_r', `hsearch_r', etc.
1466 * Ulrich Drepper has contributed new, highly-optimized versions of several
1467 string functions for the i486/Pentium family of processors.
1469 * Ulrich Drepper has updated the Linux-specific code, based largely
1470 on work done in Hongjiu Lu's version of GNU libc for Linux.
1471 The GNU library now supports Linux versions 2.0.10 and later,
1472 using the ELF object file format (i[3456]86-*-linux).
1474 * Andreas Schwab has ported the C library to Linux/m68k (m68k-*-linux).
1476 * David Mosberger-Tang and Richard Henderson have ported the C library
1477 to Linux/Alpha (alpha-*-linux). Richard Henderson contributed the
1478 dynamic linking support for ELF/Alpha.
1480 * Richard Henderson contributed several Alpha optimized assembler function
1481 for arithmetic and string handling.
1483 * Ulrich Drepper has contributed a new set of message catalog functions to
1484 support multiple languages using the <libintl.h> interface, for use with
1485 his new package GNU gettext. Translation volunteers have contributed
1486 catalogs of the library's messages in Spanish, German, and Korean.
1488 * For compatibility with XPG4, Ulrich Drepper has contributed the `gencat'
1489 program and the `catgets' function for reading the catalog files it
1490 creates. (The <libintl.h> interface is preferred; we include the
1491 <nl_types.h> interface using `catgets' only for source compatibility with
1492 programs already written to use it.)
1494 * New header file <values.h> gives SVID-compatible names for <limits.h>
1497 * Various new macros, declarations, and small header files for compatibility
1500 * New function `group_member' is a convenient way to check if a process has
1501 a given effective group ID.
1503 * When using GCC 2.7 and later, the socket functions are now declared in a
1504 special way so that passing an argument of type `struct sockaddr_in *',
1505 `struct sockaddr_ns *', or `struct sockaddr_un *' instead of the generic
1506 `struct sockaddr *' type, does not generate a type-clash warning.
1508 * New function `error' declared in header file <error.h> is a convenient
1509 function for printing error messages and optionally exiting; this is the
1510 canonical function used in GNU programs. The new functions `err', `warn',
1511 and friends in header file <err.h> are the canonical 4.4 BSD interface for
1512 doing the same thing.
1514 * The <glob.h> interface has several new flags from 4.4 BSD that extend the
1515 POSIX.2 `glob' function to do ~ and {...} expansion.
1517 * New function `unsetenv' complements `setenv' for compatibility with 4.4 BSD.
1518 `clearenv' which is used in POSIX.9 is also available.
1520 * New function `getsid' returns session ID number on systems that support it.
1522 * We have incorporated the 4.4 BSD `db' library (version 1.85). New header
1523 files <db.h> and <mpool.h> provide a rich set of functions for several
1524 types of simple databases stored in memory and in files, and <ndbm.h> is
1525 an old `ndbm'-compatible interface using the `db' functions. Link with
1526 `-ldb' to get these functions.
1528 * New macro `strdupa' copies a string like `strdup', but uses local stack
1529 space from `alloca' instead of dynamic heap space from `malloc'.
1531 * New function `strnlen' is like `strlen' but searches only a given maximum
1532 number of characters for the null terminator. `stpncpy', `strndup' and
1533 `strndupa' are similar variants for the `stpcpy', `strdup' and `strdupa'
1536 * New function `statfs' in header <sys/statfs.h>.
1538 * The new <argz.h> and <envz.h> interfaces contributed by Miles Bader
1539 provide convenient functions for operating on blocks of null-terminated
1542 * A new suite of functions in <utmp.h> handle all the details of reading
1543 and writing the utmp file.
1545 * An implementation of the NIS/YP(tm) based NSS service was contributed by
1548 * Paul Eggert and Ulrich Drepper modified the `strftime' function to be
1549 completely POSIX compliant and also implemented the extended functionality
1550 to handle alternate digit representation and alternate era date formats.
1552 * Ulrich Drepper provided an implementation of the `strptime' function
1553 defined in XPG4.2 which transforms a string into a `struct tm' value.
1555 * Paul Eggert provided the tzselect shell script as part of the timezone
1556 code. The shell script makes it easy to select the correct timezone
1559 * The implementation of the malloc family of functions is completely replaced
1560 by a new implementation by Doug Lea with many improvements by Wolfram Gloger.
1561 The implementation uses the mmap function (if available) and it is
1562 optimized for the use in multi threaded programs.
1564 * Ulrich Drepper contributed a MD5 "encryption" for the crypt family of
1565 functions. This new functionality is usable by specifying a special
1566 salt string and it is compatible with implementation on *BSD systems.
1568 * Lots of functions from the XPG4.2 standard were added by Ulrich Drepper:
1569 `getsubopt' to handle second level command line options, `bsd_signal'
1570 to access BSD style `signal' functionality, the obsolete `regexp' style
1573 * the `lchown' function is available on system which support this
1576 * The implementation of the shadow password handling function was contributed
1579 * David Mosberger-Tang changed the SunRPC implementation to be 64bit safe.
1581 * POSIX.1g support was added. The <sys/select.h> header is available,
1582 `isfdtype' and `pselect' are implemented. Craig Metz contributed an
1583 implementation of `getaddrinfo'.
1587 * For cross-compilation you should now set `BUILD_CC' instead of `HOST_CC'.
1589 * New header file <fstab.h> and new functions `getfsspec', `getfsent' and
1590 friends, for parsing /etc/fstab. This code comes from 4.4 BSD.
1592 * The new function `daemon' from 4.4 BSD is useful for server programs that
1593 want to put themselves in the background.
1595 * Joel Sherrill has contributed support for several standalone boards that
1596 run without an operating system.
1598 * `printf', `scanf' and friends now accept a `q' type modifier for long
1599 long int as well as `ll'. Formats using these might be `%qu' or `%lld'.
1601 * All of the code taken from BSD (notably most of the math and networking
1602 routines) has been updated from the BSD 4.4-Lite release.
1604 * The resolver code has been updated from the BIND-4.9.3-BETA9 release.
1606 * The new functions `getdomainname' and `setdomainname' fetch or change the
1607 YP/NIS domain name. These are system calls which exist on systems which
1610 * The time zone data files have been updated for the latest international
1613 * The SunRPC programs `portmap' and `rpcinfo' are now installed in
1614 $(sbindir) (usually /usr/local/sbin) instead of $(bindir).
1618 * The C library now includes support for Sun RPC, from Sun's free
1619 RPCSRC-4.0 distribution. The `portmap', `rpcinfo', and `rpcgen' programs
1620 are included. (There is still no support for YP.)
1622 * Tom Quinn has contributed a port of the C library to SGI machines running
1623 Irix 4 (mips-sgi-irix4).
1625 * The new `lockf' function is a simplified interface to the locking
1626 facilities of `fcntl', included for compatibility.
1628 * New time functions `timegm', `timelocal', and `dysize' for compatibility.
1630 * New header file <sys/timeb.h> and new function `ftime' for compatibility.
1632 * New header files <poll.h> and <sys/poll.h> and new function `poll' for
1635 * The error message printed by `assert' for a failed assertion now includes
1636 the name of the program (if using GNU ld) and the name of the calling
1637 function (with versions of GCC that support this).
1639 * The `psignal' function is now declared in <signal.h>, not <stdio.h>.
1641 * The library now includes the <sys/mman.h> header file and memory
1642 management functions `mmap', `munmap', `mprotect', `msync', and
1643 `madvise', on systems that support those facilities.
1645 * The interface for `mcheck' has changed slightly: the function called to
1646 abort the program when an allocation inconsistency is detected now takes
1647 an argument that indicates the type of failure. The new function
1648 `mprobe' lets you request a consistency check for a particular block at
1649 any time (checks are normally done only when you call `free' or `realloc'
1652 * It is now possible to easily cross-compile the C library, building on one
1653 system a library to run on another machine and/or operating system. All
1654 you need to do is set the variable `HOST_CC' in `configparms' to the
1655 native compiler for programs to run on the machine you are building on (a
1656 few generator programs are used on Unix systems); set `CC' to the
1659 * The new function `fexecve' (only implemented on the GNU system) executes
1660 a program file given a file descriptor already open on the file.
1664 * Brendan Kehoe has contributed most of a port to the DEC Alpha
1665 running OSF/1 (alpha-dec-osf1). He says it is 75% complete.
1667 * You can set the variable `libprefix' in `configparms' to specify a prefix
1668 to be prepended to installed library files; this makes it easy to install
1669 the GNU C library to be linked as `-lgnuc' or whatever.
1671 * The new `stpncpy' is a cross between `stpcpy' and `strncpy': It
1672 copies a limited number of characters from a string, and returns the
1673 address of the last character written.
1675 * You no longer need to check for whether the installed `stddef.h' is
1676 compatible with the GNU C library. configure now checks for you.
1678 * You can now define a per-stream `fileno' function to convert the
1679 stream's cookie into an integral file descriptor.
1681 * ``malloc (0)'' no longer returns a null pointer. Instead, it
1682 allocates zero bytes of storage, and returns a unique pointer which
1683 you can pass to `realloc' or `free'. The behavior is undefined if
1684 you dereference this pointer.
1686 * The C library now runs on Sony NEWS m68k machines running either
1687 NewsOS 3 or NewsOS 4.
1689 * The new `syscall' function is a system-dependent primitive function
1690 for invoking system calls. It has the canonical behavior on Unix
1691 systems, including unreliable return values for some calls (such as
1692 `pipe', `fork' and `getppid').
1694 * The error code `EWOULDBLOCK' is now obsolete; it is always defined
1695 to `EAGAIN', which is the preferred name. On systems whose kernels
1696 use two distinct codes, the C library now translates EWOULDBLOCK to
1697 EAGAIN in every system call function.
1701 * The GNU C Library Reference Manual is now distributed with the library.
1702 `make dvi' will produce a DVI file of the printed manual.
1703 `make info' will produce Info files that you can read on line using C-h i
1704 in Emacs or the `info' program.
1705 Please send comments on the manual to bug-glibc-manual@gnu.org.
1707 * The library now supports SVR4 on i386s (i386-unknown-sysv4).
1709 * Brendan Kehoe has contributed a port to Sun SPARCs running Solaris 2.
1711 * Jason Merrill has contributed a port to the Sequent Symmetry running
1712 Dynix version 3 (i386-sequent-dynix).
1714 * The library has been ported to i386s running SCO 3.2.4 (also known as SCO
1715 ODT 2.0; i386-unknown-sco3.2.4) or SCO 3.2 (i386-unknown-sco3.2).
1717 * New function `memory_warnings' lets you arrange to get warnings when
1718 malloc is running out of memory to allocate, like Emacs gives you.
1720 * The C library now contains the relocating allocator used in Emacs 19 for
1721 its editing buffers. This allocator (ralloc) minimizes allocation
1722 overhead and fragmentation by moving allocated regions around whenever it
1723 needs to. You always refer to a ralloc'd region with a "handle" (a
1724 pointer to a pointer--an object of type `void **').
1726 * There is a new `printf' format: `%m' gives you the string corresponding
1727 to the error code in `errno'.
1729 * In `scanf' formats, you can now use `%as' or `%a[' to do the normal `%s'
1730 or `%[' conversion, but instead of filling in a fixed-sized buffer you
1731 pass, the `a' modifier says to fill in a `char **' you pass with a
1734 * The `fnmatch' function supports the new flag bits `FNM_LEADING_DIR' and
1735 `FNM_CASEFOLD'. `FNM_LEADING_DIR' lets a pattern like `foo*' match a
1736 name like `foo/bar'. `FNM_CASEFOLD' says to ignore case in matching.
1738 * `mkstemp' is a traditional Unix function to atomically create and open a
1739 uniquely-named temporary file.
1743 * The standard location for the file that says what the local timezone is
1744 has changed again. It is now `/usr/local/etc/localtime' (or more
1745 precisely, `${prefix}/etc/localtime') rather than `/etc/localtime'.
1747 * The distribution no longer contains any files with names longer than 14
1750 * `struct ttyent' has two new flag bits: TTY_TRUSTED and TTY_CONSOLE.
1751 These are set by the new `trusted' and `console' keywords in `/etc/ttys'.
1753 * New functions `ttyslot' and `syslog' from 4.4 BSD.
1757 * The configuration process has changed quite a bit. The `configure'
1758 script is now used just like the configuration scripts for other GNU
1759 packages. The `sysdeps' directory hierarchy is much rearranged.
1760 The file `INSTALL' explains the new scheme in detail.
1762 * The header files no longer need to be processed into ANSI C and
1763 traditional C versions. There is just one set of files to install, and
1764 it will work with ANSI or old C compilers (including `gcc -traditional').
1766 * Brendan Kehoe and Ian Lance Taylor have ported the library to the
1767 MIPS DECStation running Ultrix 4.
1769 * The Sun 4 startup code (crt0) can now properly load SunOS 4 shared libraries.
1770 Tom Quinn contributed the initial code. The GNU C library can NOT yet be
1771 made itself into a shared library.
1773 * Yet further improved support for the i386, running 4.3 BSD-like systems
1774 (such as Mach 3 with the Unix single-server), or System V.
1776 * New function `strncasecmp' to do case-insensitive string comparison
1777 with limited length.
1779 * New function `strsep' is a reentrant alternative to `strtok'.
1781 * New functions `scandir' and `alphasort' for searching directories.
1783 * New function `setenv' is a better interface to `putenv'.
1785 * Ian Lance Taylor has contributed an implementation of the SVID `ftw'
1786 function for traversing a directory tree.
1788 * The GNU obstack package is now also part of the C library.
1789 The new function `open_obstack_stream' creates a stdio stream that
1790 writes onto an obstack; `obstack_printf' and `obstack_vprintf' do
1791 formatted output directly to an obstack.
1793 * Miscellaneous new functions: reboot, nice, sigaltstack (4.4 BSD only),
1794 cfmakeraw, getusershell, getpass, swab, getttyent, seteuid, setegid.
1796 * `FNM_FILE_NAME' is another name for `FNM_PATHNAME', used with `fnmatch'.
1798 * The new functions `strfry' and `memfrob' do mysterious and wonderful
1799 things to your strings.
1801 * There are some new test programs: test-fseek, testmb, and testrand.
1803 * Some work has been done to begin porting the library to 4.4 BSD and Linux.
1804 These ports are not finished, but are a good starting place for really
1805 supporting those systems.
1807 * `/etc/localtime' is now the standard location for the file that says what
1808 the local timezone is, rather than `/usr/local/lib/zoneinfo/localtime'.
1809 This follows the general principle that `/etc' is the place for all local
1810 configuration files.
1812 * The C library header files now use `extern "C"' when used by the C++
1813 compiler, so the C library should now work with C++ code.
1815 * The header file <bstring.h> is gone. <string.h> now declares bcopy,
1816 bcmp, bzero, and ffs. (Update: nowadays these functions are declared
1819 * Mike Haertel (of GNU e?grep and malloc fame) has written a new sorting
1820 function which uses the `merge sort' algorithm, and is said to be
1821 significantly faster than the old GNU `qsort' function. Merge sort is
1822 now the standard `qsort' function. The new algorithm can require a lot
1823 of temporary storage; so, the old sorting function is called when the
1824 required storage is not available.
1826 * The C library now includes Michael Glad's Ultra Fast Crypt, which
1827 provides the Unix `crypt' function, plus some other entry points.
1829 * The code and header files taken from 4.4 BSD have been updated with the
1830 latest files released from Berkeley.
1832 ----------------------------------------------------------------------
1833 Copyright information:
1835 Copyright (C) 1992-1999,2000,2001,2002,2003,2004,2005,2006
1836 Free Software Foundation, Inc.
1838 Permission is granted to anyone to make or distribute verbatim copies
1839 of this document as received, in any medium, provided that the
1840 copyright notice and this permission notice are preserved,
1841 thus giving the recipient permission to redistribute in turn.
1843 Permission is granted to distribute modified versions
1844 of this document, or of portions of it,
1845 under the above conditions, provided also that they
1846 carry prominent notices stating who last changed them.
1849 version-control: never