1 GNU C Library NEWS -- history of user-visible changes. 2009-10-29
2 Copyright (C) 1992-2008, 2009 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 interfaces: execvpe, pthread_sigqueue, mkstemps, mkstemps64
11 Implemented by Ulrich Drepper.
13 * Checking version of longjmp added that fails if an uninitialized stack
14 frame would be created. Implemented by Ulrich Drepper.
16 * STT_GNU_IFUNC is now supported in static executables.
17 Implemented by H.J. Lu.
19 * STT_GNU_IFUNC implemented for PPC by Alan Modra.
21 * New optimized string functions for x86-64: strstr, strcasestr, memcmp,
22 strcspn, strpbrk, strspn, strcpy, stpcpy, strncpy, strcmp (SSE2, SSE4.2),
23 strncmp (SSE2, SSE4.2), strchr (SSE4.2), strrchr (SSE4.2).
24 Contributed by H.J. Lu.
26 strlen, rawmemchr, strcmp (SSSE3), strncmp (SSSE3).
27 Implemented by Ulrich Drepper.
29 * New optimized string functions for x86: strlen, strcspn, strspn, strpbrk,
31 Contributed by H.J. Lu.
33 * Support for fma instruction in AVX on x86-64.
34 Implemented by H.J. Lu and Ulrich Drepper.
36 * AVX support in x86-64 auditing support in ld.so.
37 Implemented by H.J. Lu.
39 * STB_GNU_UNIQUE support added.
40 Implemented by Ulrich Drepper.
42 * Implement second fallback mode for optimized DNS lookup for even more
43 broken environments. If two requests from the same port are not
44 handled correctly close the socket and open a new one before sending
45 the second request. The 'single-request-reopen' option in /etc/resolv.conf
46 can be used to select this mode right away, instead of rediscovering the
47 necessity is every process again.
48 Implemented by Ulrich Drepper.
50 * New resolver flag RES_USE_DNSSEC to enable use of verified lookup.
51 Implemented by Adam Tkac.
53 * Optimized iconv conversions for S390x.
54 Implemented by Andreas Krebbel.
56 * Using condvars with PI mutexes is now more efficient due to kernel
57 support for requeueing to PI futexes. NPTL support added for x86-64.
58 Implemented by Ulrich Drepper.
65 * New interfaces: preadv, preadv64, pwritev, pwritev64, malloc_info
66 Implemented by Ulrich Drepper.
68 * New Linux interfaces: accept4, fallocate, fallocate64.
69 Implemented by Ulrich Drepper.
71 * Correct declarations of string function when used in C++ code. This
72 could lead to compile errors for invalid C++ code.
74 * XPG7/POSIX 2008 compilation environment. Many GNU-specific functions are
77 * New POSIX 2008 interface: psiginfo
78 Implemented by Ulrich Drepper.
80 * New ISO C++1x interfaces: quick_exit, at_quick_exit
81 Implemented by Ulrich Drepper.
83 * Support for selecting between multiple function definitions at runtime
84 using STT_GNU_IFUNC symbols. Implemented by Ulrich Drepper.
86 * The libcrypt library can now use the hash function implementations in
87 NSS. Implemented by Ulrich Drepper.
89 * The malloc implementation can be compiled to be less memory efficient
90 but higher performing in multi-threaded programs.
91 Implemented by Ulrich Drepper.
93 * New locales: nan_TW@latin, ks_IN
95 * Faster strlen, strchr, strchrnul, strrchr, memchr, and rawmemchr for x86-64.
96 Implemented by Ulrich Drepper.
98 * Extended printf hook support. It is possible to use user-defined types
99 and extend existing format specifiers.
100 Implemented by Ulrich Drepper.
102 * Handling for group shadow files has been added.
103 Implemented by Ulrich Drepper.
105 * DNS IPv4-IPv6 parallel lookup now deals better with broken DNS
106 servers (the case, e.g., for some people using the built-in DNS
107 server in ADSL modems/routers). There is a once-per-process timeout
108 in case of a broken server. To avoid it, users can run nscd or put
109 'options single-request' in /etc/resolv.conf.
110 Implemented by Ulrich Drepper.
115 * Unified lookup for getaddrinfo: IPv4 and IPv6 addresses are now looked
116 up at the same time. Implemented by Ulrich Drepper.
118 * TLS descriptors for LD and GD on x86 and x86-64.
119 Implemented by Alexandre Oliva.
121 * getaddrinfo now handles DCCP and UDPlite.
122 Implemented by Ulrich Drepper.
124 * New fixed-size conversion macros: htobe16, htole16, be16toh, le16toh,
125 htobe32, htole32, be32toh, le32toh, htobe64, htole64, be64toh, le64toh.
126 Implemented by Ulrich Drepper.
128 * New implementation of memmem, strstr, and strcasestr which is O(n).
129 Implemented by Eric Blake.
131 * New Linux interfaces: inotify_init1, dup3, epoll_create1, pipe2
133 * Implement "e" option for popen to open file descriptor with the
134 close-on-exec flag set. Implemented by Ulrich Drepper.
136 * Implement "b" mode for fmemopen. In this mode writes writes don't
137 implicitly add a NUL byte and seeks from the end of the buffer really
138 use the buffer end, not the string length as the basis.
139 Implemented by Ulrich Drepper.
141 * Many functions, exported and internal, now atomically set the close-on-exec
142 flag when run on a sufficiently new kernel. Implemented by Ulrich Drepper.
144 * Sorting rules for some Indian languages (Kannada, Gurumukhi, Telugu,
146 Implemented by Pravin Satpute.
148 * New locales: sd_IN, sd_IN@devanagari, ks_IN@devanagari, ht_HT, en_AG, nl_AW.
152 * New locales: bo_CN, bo_IN, shs_CA.
154 * New encoding: HP-ROMAN9, HP-GREEK8, HP-THAI8, HP-TURKISH8.
156 * Sorting rules for some Indian languages (Devanagari and Gujarati).
157 Implemented by Pravin Satpute.
159 * IPV6 addresses in /etc/resolv.conf can now have a scope ID
161 * nscd caches now all timeouts for DNS entries
162 Implemented by Ulrich Drepper.
164 * nscd is more efficient and wakes up less often.
165 Implemented by Ulrich Drepper.
167 * More checking functions: asprintf, dprintf, obstack_printf, vasprintf,
168 vdprintf, and obstack_vprintf.
169 Implemented by Jakub Jelinek.
171 * Faster memset for x86-64.
172 Implemented by Harsha Jagasia and H.J. Lu.
174 * Faster memcpy on x86.
175 Implemented by Ulrich Drepper.
177 * ARG_MAX is not anymore constant on Linux. Use sysconf(_SC_ARG_MAX).
178 Implemented by Ulrich Drepper.
180 * Faster sqrt and sqrtf implemention for some PPC variants.
181 Implemented by Stephen Munroe.
185 * More checking functions: fread, fread_unlocked, open*, mq_open.
186 Implemented by Jakub Jelinek and Ulrich Drepper.
188 * Extend fortification to C++. Implemented by Jakub Jelinek.
190 * Implement 'm' modifier for scanf. Add stricter C99/SUS compliance
191 by not recognizing 'a' as a modifier when those specs are requested.
192 Implemented by Jakub Jelinek.
194 * PPC optimizations to math and string functions.
195 Implemented by Steven Munroe.
197 * New interfaces: mkostemp, mkostemp64. Like mkstemp* but allow additional
198 options to be passed. Implemented by Ulrich Drepper.
200 * More CPU set manipulation functions. Implemented by Ulrich Drepper.
202 * New Linux interfaces: signalfd, eventfd, eventfd_read, and eventfd_write.
203 Implemented by Ulrich Drepper.
205 * Handle private futexes in the NPTL implementation.
206 Implemented by Jakub Jelinek and Ulrich Drepper.
208 * Add support for O_CLOEXEC. Implement in Hurd. Use throughout libc.
209 Implemented by Roland McGrath and Ulrich Drepper.
211 * Linux/x86-64 vDSO support. Implemented by Ulrich Drepper.
213 * SHA-256 and SHA-512 based password encryption.
214 Implemented by Ulrich Drepper.
216 * New locales: ber_DZ, ber_MA, en_NG, fil_PH, fur_IT, fy_DE, ha_NG, ig_NG,
217 ik_CA, iu_CA, li_BE, li_NL, nds_DE, nds_NL, pap_AN, sc_IT, tk_TM, ug_CN,
220 + New iconv modules: MAC-CENTRALEUROPE, ISO-8859-9E, KOI8-RU.
221 Implemented by Ulrich Drepper.
225 * New Linux interfaces: epoll_pwait, sched_getcpu.
227 * New generic interfaces: strerror_l.
229 * nscd can now cache the services database. Implemented by Ulrich Drepper.
234 * For Linux, the sorting of addresses returned by getaddrinfo now also
235 handles rules 3, 4, and 7 from RFC 3484. I.e., all rules are handled.
236 Implemented by Ulrich Drepper.
238 * Allow system admin to configure getaddrinfo with the /etc/gai.conf file.
239 Implemented by Ulrich Drepper.
241 * New Linux interfaces: splice, tee, sync_file_range, vmsplice.
243 * New iconv module for MIK. Contributed by Alexander Shopov.
245 * For sites with broken group and/or passwd database, the auto-propagate
246 option of nscd can prevent creating ID lookup entries from the results
247 of a name lookup and vice versa. This usually is no problem but some
248 site might have problems with the default behavior.
249 Implemented by Ulrich Drepper.
251 * Iterating over entire database in NIS can be slow. With the
252 SETENT_BATCH_READ option in /etc/default/nss a system admin can decide
253 to trade time for memory. The entire database will be read at once.
254 Implemented by Ulrich Drepper.
256 * The interfaces introduced in RFC 3542 have been implemented by
259 * Support for the new ELF hash table format was added by Ulrich Drepper.
261 * Support for priority inheritance mutexes added by Jakub Jelinek and
264 * Support for priority protected mutexes added by Jakub Jelinek.
266 * New locales: nr_ZA, pa_PK, ca_AD, ca_FR, ca_IT, el_CY, tr_CY, as_IN,
267 or_IN, csb_PL, fy_NL, sr_ME.
271 * More overflow detection functions.
273 * New iconv converters for IBM1025, IBM1122, IBM1137, IBM1153,
274 IBM1154, IBM1155, IBM1156, IBM1157, and IBM1158 contributed by Jiro Sekiba.
276 More converters for IBM803, IBM901, IBM902, IBM921, IBM1008, IBM1097,
277 IBM1112, IBM1123, IBM1130, IBM1140, IBM1141, IBM1142, IBM1143, IBM1144,
278 IBM1145, IBM1146, IBM1147, IBM1148, IBM1149, IBM1166, IBM1167, IBM4517,
279 IBM4899, IBM4909, IBM4971, IBM5347, IBM9030, IBM9066, IBM9448, IBM12712,
280 IBM16804, IBM1364, IBM1371, IBM1388, IBM1390, and IBM1399 contributed
281 by Masahide Washizawa.
283 * It is now possible to install audit libraries for the dynamic linker using
284 LD_AUDIT. Implemented by Ulrich Drepper.
286 * The LinuxThreads add-on, providing pthreads on Linux 2.4 kernels, is no
287 longer supported. The new NPTL implementation requires Linux 2.6 kernels.
288 For a libc and libpthread that works well on Linux 2.4 kernels, we
289 recommend using the stable 2.3 branch.
291 * The new function open_wmemstream acts like open_memstream,
292 but uses a wchar_t wide character buffer.
294 * The new function ppoll is an improved version of poll, similar to pselect.
296 * New interfaces: fdopendir, openat, fstatat, fchmodat, fchownat,
297 futimesat, faccessat, mkdirat, mkfifoat, mknodat,
298 renameat, unlinkat, linkat, symlinkat, readlinkat.
300 * New Linux kernel system calls: unshare,
301 inotify_init, inotify_add_watch, inotify_rm_watch.
303 * The euidaccess function is now also known by the alias eaccess,
304 for compatibility with some other systems.
306 * Timezone data updated to 2006b version.
310 * The following bugs are resolved with this release:
312 38, 253, 549, 622, 653, 721, 758, 851, 877, 915, 934, 955, 961,
313 1016, 1037, 1076, 1079, 1080, 1081, 1082, 1083, 1084, 1085, 1086,
314 1087, 1088, 1090, 1091, 1092, 1093, 1094, 1095, 1096, 1097, 1098,
315 1099, 1100, 1101, 1102, 1103, 1104, 1105, 1106, 1107, 1108, 1109,
316 1110, 1111, 1112, 1113, 1125, 1137, 1138, 1249, 1250, 1251, 1252,
317 1253, 1254, 1350, 1358, 1394, 1438, 1498, 1534
319 Visit <http://sources.redhat.com/bugzilla/> for the details of each bug.
321 * As of this release, GCC 4 can be used to compile the C Library.
323 * Timezone data updated to 2005m version.
327 * The following bugs are resolved with this release:
329 284, 592, 602, 626, 633, 640, 650, 661, 671, 681, 693, 700, 710, 719,
330 722, 723, 725, 726, 727, 728, 729, 730, 731, 732, 733, 734, 735, 736,
331 737, 738, 739, 740, 741, 742, 743, 744, 745, 765, 767, 768, 769, 776,
332 777, 787, 821, 822, 823, 825
334 Visit <http://sources.redhat.com/bugzilla/> for the details of each bug.
338 * Support for RFC 3678. Real implementations exist only for Linux so far.
339 Implemented by Ulrich Drepper.
341 * nscd can now cache entries persistently. Expiring entries are reloaded.
342 For speedups the cache can be shared in memory with client processes.
343 Implemented by Ulrich Drepper.
345 * nscd can now perform SELinux checks.
346 Implemented by Matthew Rickard <mjricka@epoch.ncsc.mil>.
348 * getaddrinfo queries are now cached. Canonical name lookup is performed
350 Implemented by Ulrich Drepper.
352 * The nothrow function attribute is used when headers are used by gcc when
353 compiling C code. This can avoid significant amounts of exception
356 * The malloc functions perform more error checking and are stricter when
357 it comes to reacting on errors. The default action is to terminate
358 the process after showing an error message. Implemented by Ulrich Drepper.
360 * Reverse lookups of IPv6 addresses does not use bit string or .ip6.int
361 lookups anymore unless explicitly requested. Implemented by Ulrich Drepper.
363 * Namespaces in ld.so are implemented. DSOs can be loaded in separate
364 namespaces using the new function dlmopen(). This feature is of course,
365 like most other dynamic loading functionality, not available in statically
366 linked applications. Implemented by Ulrich Drepper.
368 * Low-overhead boundary checking variants of string and some stdio functions
369 were added. These are to be used in conjunction with a gcc patch by
370 Jakub Jelinek which adds calls to these functions if possible.
371 Implemented by Jakub Jelinek and Ulrich Drepper.
373 * Old code for several operating systems and machine architectures that
374 have not been in working condition in a long time have been removed from
375 the main source tree maintained by the GNU C Library's maintainers.
376 These files are now reside in the separate `ports' source module
377 that is usable as an add-on when building the library.
381 * New functions `dladdr1' and `dlinfo' in <dlfcn.h> provide more ways to
382 interrogate the dynamic linker, compatible with the Solaris interface.
384 * ELF thread-local storage support (TLS) now works on PowerPC and PowerPC64;
385 implemented by Paul Mackerras, Steven Munroe, and Roland McGrath.
387 * getifaddrs now uses the netlink interface on Linux to get its information.
388 Implemented by Thorsten Kukuk.
390 * getaddrinfo now implements AI_V4MAPPED, AI_ALL, and AI_ADDRCONF.
391 Implemented by Ulrich Drepper.
393 * support for non-executable stacks on x86 has been added. Changes mostly
396 * regex is now much faster for multibyte locales. Changes by Jakub Jelinek
399 * getaddrinfo now performs destination address selection according to
404 * Thread-safe interfaces for many functions that access locale data
405 were added in version 2.3, but these features were omitted from NEWS.
406 Many functions have variants with an `_l' suffix that take a `locale_t'
407 object as a parameter rather than consulting the current locale.
408 The new functions `newlocale', `duplocale', and `freelocale' in <locale.h>
409 create and maintain `locale_t' objects. Additionally, the new function
410 `uselocale' sets "the current locale" (as used by functions not so
411 parameterized) set for an individual thread. These features were added
412 in version 2.3, implemented by Ulrich Drepper and Roland McGrath.
414 * The functions getresuid, getresgid, setresuid, and setresgid, which
415 have long been available on Linux, are now declared in <unistd.h>
416 and are now also available on the Hurd.
418 * ELF thread-local storage support (TLS) now works on x86-64.
420 * The new dynamic string token $LIB is expanded in shared library names.
421 This normally expands to lib, but on some 64-bit platforms to lib64 instead.
423 * Aldy Hernandez contributed complete software floating point support for
424 PowerPC machines with no FPU.
426 * fexecve is implemented on Linux.
428 * The `btowc' function should work at least twice as fast due to
429 specialized callbacks in the iconv modules. Implemented by Bruno Haible.
431 * With approriate thread add-ons cancelable functions are now implemented
432 in libc.so as well. No need to call the function in libpthread. This
433 change allowed to finally disable the incorrect and expensive handling
434 of weak definition in ld.so.
436 * Yet more PLT entries in libc.so have been removed. We finally arrived
437 at the bare minimum. Startup times improved appropriately.
439 * Support for the new Linux/x86 system call interface was added. The
440 AT_SYSINFO auxiliary vector entry is recognized and handled.
444 * Masahide Washizawa contributed iconv modules for IBM1163 and IBM1164
447 * iconv (the program and the interface) now accepts empty names (excluding
448 options like //TRANSLIT) to mean "use charset of current locale".
450 * localedef can now transliterate characters in strings which are not in
451 the provided charmap. The information from the input locale is used.
453 * Prelinking support was added for ELF targets. This requires additional
454 tools and recent versions of the GNU binutils. Contributed by Jakub Jelinek.
456 * Read-only stdio streams now use mmap to speed up operation by eliminating
457 copying and buffer underflows. To use add 'm' to the mode string of
458 the fopen/fdopen/freopen call. Implemented by Ulrich Drepper.
460 * The malloc functions were completely rewritten by Wolfram Gloger based
461 on Doug Lea's malloc-2.7.0.c.
463 * Isamu Hasegawa contributed a completely new and POSIX-conformant
464 implementation of regex.
466 * Bruno Haible upgraded the iconv and locale implementation to support
469 * Contents of the LC_* and LANG environment variables in the CEN style are
470 not recognized anymore. It never was used. Change by Ulrich Drepper.
472 * The runtime (ld.so, libc, libpthread for Linux) now can handle the ELF
473 thread-local storage (TLS) ABI on some platforms.
474 Changes by Ulrich Drepper. SH support by Kaz Kojima.
476 * Bruno Haible contributed iconv converters for ISO-2022-JP-3, SHIFT JIS-X0213,
477 EUC-JISX0213, and TSCII.
479 * New header <ifaddrs.h> with functions `getifaddrs' and `freeifaddrs':
480 BSD-compatible interface for getting all network interface addresses.
481 Implementation for IPv4 by Roland McGrath.
483 * Loading of locale data is faster due to the introduction of a locale
484 archive. Implemented by Roland McGrath and Ulrich Drepper.
486 * Startup times are significantly reduced by not using exported functions
487 inside the library itself. Changes by Jakub Jelinek, Roland McGrath,
490 * Steven Munroe contributed a port to PowerPC64/Linux.
494 * The Hurd now uses the GNU libio implementation of stdio rather than the
495 old GNU stdio implementation, and uses a new ABI (libc.so.0.3).
497 * The Hurd on x86 now has the `ioperm' function and <sys/io.h> header file
498 with the same behavior as the Linux system call of the same name.
502 * Stephen Moshier implemented log2, log10, powl and cbrtl for the
503 128-bit long double format.
505 * Masahide Washizawa contributed iconv modules for IBM1132, IBM1133, IBM1160,
506 IBM1161, and IBM1162 charsets.
508 * Andreas Jaeger contributed a port to x86-64/Linux.
510 * Peter Bruin contributed a port to PowerPC/Hurd.
512 * libc functions using I/O streams now can handle wide-oriented streams
515 * optimizations in the dynamic linker. Binaries created by recent binutils
516 versions start up quicker due to reduced time spent on relocations.
518 * Support for use of gcc3 added by Jakub Jelinek and HJ Lu.
522 * Stephen Moshier implemented cosh, expm1, log1p, acos, sinh, tanh,
523 asinh, atanh, j0 for the 128-bit long double format.
525 * Bruno Haible updated all the code handling Unicode in some form to
528 * Speed of regex for single-byte locales is back to previous levels.
529 Patch by Isamu Hasegawa.
531 * Alpha, SPARC, and IA-64 now also using floating stacks.
533 * Startup time of internationalized applications greatly improved through
534 iconv cache. Use iconvconfig to generate the cache file.
535 Contributed by Ulrich Drepper.
537 * The IA-64 specific part of ld.so was rewritten to eliminate some pretty
538 severe performance problems. Patch by David Mosberger.
540 * The Hurd port got a lot more functionality like AIO, various stdio
541 extensions, etc. Mainly done by Roland McGrath.
543 * mtrace can now lookup symbols in shared libraries.
547 * Intel's IA-64 math library is largely integrated. It provides fast and
548 accurate implementatations for most basic and standard math functions
549 in float, double, and long double format.
551 * Stephen Moshier implemented j0, j1, jn, y0, y1, yn, lgamma, erf, erfc,
552 and asin for the 96-bit long double format and asin, log, tan for the
553 128-bit long double format.
555 * The beginning of a last-bit accurate math library by IBM Haifa were added.
556 The basic double functions exist today. Contributed by Abraham Ziv
557 <ziv@il.ibm.com>, Moshe Olshansky <olshansk@il.ibm.com>, Ealan Henis
558 <ealan@il.ibm.com>, and Anna Reitman <reitman@il.ibm.com>.
560 * An asynchronous name lookup library was added. The interface is designed
561 after POSIX AIO. The proposal was circulated beforehand to get comments.
562 No negative ones came in. Implemented by Ulrich Drepper.
564 * Port to S390/64bit contributed by Martin Schwidefsky
565 <schwidefsky@de.ibm.com>.
567 * David Mosberger <davidm@hpl.hp.com> implemented the setcontext family
568 of functions for Linux/IA-64.
570 * The RPC code is now thread safe. Threads can now use the same service
571 of different services at the same time. Patch by Eric Norum
572 <eric.norum@usask.ca> with some help by Ulrich Drepper.
574 * Martin Schwidefsky <schwidefsky@de.ibm.com> implemented the setcontext
575 family of functions for Linux/S390.
577 * Ulrich Drepper <drepper@redhat.com> implemented the setcontext family
578 of functions for Linux/x86.
580 * Port to Linux/CRIS contributed by Axis Communications.
584 * Lots of headers were cleaned up. Using the tool in the conform/ subdir
585 we can now check for namespace violations and missing declarations. The
586 result is that almost all headers are now Unix-compliant (as defined in
587 the upcoming XPG6). The negative side is that some programs might need
588 corrections, too, if they depend on the incorrect form of the headers in
589 previous versions which defined too many symbols and included too many
592 * regex now handles multibyte character sets correctly.
593 Contributed by Isamu Hasegawa <isamu@yamato.ibm.com>.
595 * iconv (the program) does now conform to the upcoming XPG6 and handles
596 charmaps. Instead of the charset names the path of charmaps can be
597 provided and the conversion happens based on this data.
598 Contributed by Ulrich Drepper.
600 * The locale program now provides detailed information about the installed
605 only lists the names of the supported locales
609 provides details such as country, language, and codeset name.
610 Contributed by Ulrich Drepper.
614 * The gencat program now parses the input file according to the charset
615 selected by the LC_CTYPE category. This is important for stateful
616 character sets. To make generating catalogs easier there is a way
617 to overwrite the charset selected by the locale: before the first
618 message or $ quote line the catalog can contain a line like
622 to select the charset (ISO-8859-2 in this case).
624 Implemented by Shinya Hanataka and Ulrich Drepper.
626 * New codeset conversion modules: IBM-922 (Estonia PC codeset),
627 IBM-1124 (Ukraine PC codeset), IBM-1129 (Vietnamese PC codeset).
628 Contributed by Masahide Washizawa <washi@jp.ibm.com>.
630 * Optimized string functions for Alpha ev6 and ev67 by Richard Henderson
631 <rth@redhat.com> and Rick Gorton <rick.gorton@alpha-processor.com>.
633 * The LANGUAGE environment variable is now ignored unless the locale is
634 changed from the default "C" locale.
636 * The usual bug fixes.
640 * Greg McGary added runtime support for bounds checking using gcc's
641 new -fbounded-pointers option. ix86 target is complete. PowerPC
644 * Thorsten Kukuk added secure mode support to nscd.
646 * The Berkeley db libraries have been removed.
648 Related, the nss_db module is now in a separate package since it
649 obviously requires a database library being available.
651 * Wide character I/O streams implemented by Ulrich Drepper.
653 * Functions from the extended socket API added by Ulrich Drepper.
655 * Functions feenableexcept and fedisableexcept to control the
656 behaviour of individual exceptions have been added by Andreas Jaeger.
658 * ldconfig program added by Andreas Jaeger and Jakub Jelinek.
660 * The resolver code has been updated from bind 8.2.3-T5B which supports
661 threads. The integration was done by Andreas Jaeger, Adam D. Bradley,
664 This change could in some situations effect backward compatibility. Since
665 now `_res' is a thread-local instead of a global variable, modifying it
666 in one thread does not have any effect in other threads.
668 The resolver library was also extended to allow IPv6 as the transport
669 protocol for the requests. This work was done by Stig Venaas.
671 * Compatibility code for K&R C compilers has been removed from the
672 header files. A ISO C compiler is needed to use the library
673 (conforming to either C89 or C99 standard).
675 * Complete rewrite of the localedef program to support multibyte character
676 sets. Implement handling of ISO 14651 and ISO 14652. Rewrite strcoll,
677 strxfrm, wcscoll, and wcsxfrm functions. Make isw*() functions work.
678 Implemented by Ulrich Drepper.
680 Bruno Haible significantly improved the generation and use of the data
681 structures for the wide character tables.
683 * Plural handling in gettext implemented by Ulrich Drepper.
685 * The utmp daemon has been removed.
687 * The port to MIPS-Linux has been finished by Andreas Jaeger.
689 * A port to Hitachi SH3 and SH4 has been contributed by Kazumoto Kojima
692 * POSIX clocks and timers implemented by Kaz Kylheku and Ulrich Drepper.
694 * POSIX barriers implemented by Kaz Kylheku.
696 * POSIX spawn function family implemented by Ulrich Drepper.
698 * POSIX spinlocks are now available.
700 * Timed wait functions for mutex, rwlock, and semaphores are implemented.
702 * the configure option --enable-kernel=X.Y.Z allows to strip out
703 compatibility for kernel versions before X.Y.Z. This is currently only
704 implemented for Linux.
706 * the sockaddr_in6 structure changed. The IPv6 working group added a new
707 field sin6_scope_id. This means that all programs using IPv6 should be
708 recompiled. Don't expect binary compatibility with previous glibc
711 * various conversion modules for IBM character sets contributed by
714 * IA-64 port by Jes Sorensen and HJ Lu.
716 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
717 Compiling the GNU C Library for Linux/ia64
718 ******************************************
720 Please refer to the file INSTALL in the same directory as you found
721 this file for general information about configuring and compiling
724 For general inquiries about glibc under Linux/ia64 please use the
725 following mailing list linux-ia64@linuxia64.org or one of the relevant
728 Recommended Tools for Compilation
729 =================================
731 In order for glibc-2.2 to build correctly on the ia64 you need at
732 least the following versions of the GNU tools (the :
734 * The Cygnus toolchain snapshot for the ia64 as of August 4
735 including the provided set of patches. It is however recommend
736 you use the October 24 toolchain snapshot or a more recent version.
738 OR alternatively you can try the following (the Cygnus toolchain is
739 the recommended solution):
741 * GCC and binutils, GAS and GNU LD out of CVS from
742 sources.redhat.com as of August 28, 2000 or later. The CVS tree
743 may require special patches to work properly on the ia64.
745 Configuring and compiling GNU Libc for Linux/ia64
746 =================================================
748 The library requires Linux kernel version 2.4.0-test4-000728 or
749 later to funtion properly. Besides that it support for debug libraries
750 is currently untested. Hence the following options
751 are required for configuring the library:
753 --disable-debug --enable-kernel=2.4.0
755 It is also important that you make sure the library picks up the
756 appropriate kernel header files, if you do not have recent enough
757 kernel headers in /usr/src/linux/include, you should use the
758 --with-headers=<path> option to specify the location.
760 As an example I personally use the following options to configure
765 --enable-kernel=2.4.0
769 --with-headers=/home/jes/linux/include
774 Jes Sorensen <jes@linuxcare.com>,
776 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
790 * New ISO C 9x function _Exit, imaxabs, and imaxdiv are added.
792 * New xdr functions are added; some rpc functions are now 64bit clean.
794 * Fixed a number of bugs and memory leaks (especially in NIS+ code).
796 * Fixed known incompatibilities with glibc 2.0.
798 * New functions lock64, strchrnul, rawmemchr, getutmp and getutmpx.
800 * Optimized a number of functions (especially the ELF dynamic loader).
802 * Update timezone data files.
804 * lots of charmaps corrections
806 * some new locale definitions and charmaps
811 * Richard Henderson corrected size of struct timeval on Linux/Alpha to
812 conform to POSIX member type requirements. Symbol versions have been
813 adjusted as needed within the library, and for direct use by applications,
814 but there is potential for problems if third-party libraries use
815 struct timeval as part of their interface. This does not present
816 a problem for X and other "essential" system libraries.
818 * An additional locale model to support C++ Standard Library locale
819 model and probably more was implemented by Ulrich Drepper.
821 * Eric Youngdale and Ulrich Drepper implemented versioning of objects on
824 * Miles Bader provided the `argp' function family to support hierachical
825 command line argument parsing, layered on top of getopt.
827 * strtod accepts new hexadecimal floating-point format from ISO C 9X.
829 * printf has two new specifiers %a and %A to print hexadecimal flaoting-point
832 * scanf recognizes the %a and %A format for scanning floating point numbers.
834 * the new headers <stdint.h> and <inttypes.h> from ISO C 9X provides
835 information and interfaces for the available integer types.
837 * about 130 new math functions were added to implement the ISO C9x math
840 * the new header <complex.h> contains definitions of the complex math
841 functions from ISO C 9X.
843 * the new header <tgmath.h> defines generic macros to use complex or
844 real valued functions.
846 * Thorsten Kukuk provided an implementation for NIS+, securelevel 0, 1 and 2.
848 * Andreas Jaeger provided a test suite for the math library.
850 * Mark Kettenis implemented the utmpx interface and an utmp daemon.
852 * Ulrich Drepper added character set conversion functions (iconv).
854 * Optimized string functions have been added.
856 * The localedata addon is now part of glibc.
858 * An implementation of profiling shared libraries was added by Ulrich Drepper.
860 * Thorsten Kukuk and Ulrich Drepper provided an implementation for a caching
861 daemon for NSS (nscd).
863 Missing a better place here are some numbers on improvements. Under
864 Linux 2.1.125 un-tar-ing the kernel sources takes
868 using local files 12.19s 6.88s 22.91s
870 using NIS 13.92s 8.91s 26.34s
872 using NIS & nscd 10.37s 7.34s 25.30s
874 using NIS+ 27.57s 30.37s 640.46s
876 using NIS+ & nscd 10.25s 7.83s 26.51s
878 using NIS & old nscd [1] 13.83s 8.32s 29.60s
880 Keep in mind that non-namelookup related operations dominate above times.
881 It was just a common complain that using NIS+ unpacking the kernel is
884 [1] The old nscd implementation is not available anymore since it was
885 distributed with glibc up to version 2.0.98 and thus is now replaced.
887 * Tim Waugh provided an implementation of the POSIX.2 wordexp function family.
889 * Mark Kettenis provided a Hesiod NSS module.
891 * The ELF dynamic loader knows how to process dynamic string tokens ($ORIGIN
892 and $PLATFORM) in RPATHs and similar strings (Ulrich Drepper).
894 * rcmd can now handle netgroups (Dick Streefland).
896 * A port to the ARM was contributed by Phil Blundell, Pat Beirne and Scott
899 * Support for the IPv6 protocol has been added to the socket API, as per the
900 latest draft standards.
902 * Support for Linux 2.2 has been added.
904 * Interface changes relative to the latest 2.0.x release:
905 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
906 addseverity NEW: Unix98
908 argp_err_exit_status NEW: argp, GNU ext
909 argp_error NEW: argp, GNU ext
910 argp_failure NEW: argp, GNU ext
911 argp_help NEW: argp, GNU ext
912 argp_parse NEW: argp, GNU ext
913 argp_program_bug_address NEW: argp, GNU ext
914 argp_program_version NEW: argp, GNU ext
915 argp_program_version_hook NEW: argp, GNU ext
916 argp_state_help NEW: argp, GNU ext
917 argp_usage NEW: argp, GNU ext
918 authdes_create NEW: Secure RPC
919 authdes_getucred NEW: Secure RPC
920 authdes_pk_create NEW: Secure RPC
921 backtrace NEW: GNU ext.
922 backtrace_symbols NEW: GNU ext.
923 backtrace_symbols_fd NEW: GNU ext.
927 cacoshf NEW: ISO C 9x
928 cacoshl NEW: ISO C 9x
938 casinhf NEW: ISO C 9x
939 casinhl NEW: ISO C 9x
944 catanhf NEW: ISO C 9x
945 catanhl NEW: ISO C 9x
947 cbc_crypt NEW: Secure RPC
960 clearerr_locked REMOVED
961 clntunix_create NEW: sunrpc ext
964 clog10f NEW: ISO C 9x
965 clog10l NEW: ISO C 9x
996 des_setparity NEW: Secure RPC
997 ecb_crypt NEW: Secure RPC
998 endutxent NEW: Unix98
1000 exp10f NEW: ISO C 9x
1001 exp10l NEW: ISO C 9x
1005 fattach NEW: STREAMS
1006 fdetach NEW: STREAMS
1010 feclearexcept NEW: ISO C 9x
1011 fegetenv NEW: ISO C 9x
1012 fegetexceptflag NEW: ISO C 9x
1013 fegetround NEW: ISO C 9x
1014 feholdexcept NEW: ISO C 9x
1016 feraiseexcept NEW: ISO C 9x
1017 ferror_locked REMOVED
1018 fesetenv NEW: ISO C 9x
1019 fesetexceptflag NEW: ISO C 9x
1020 fesetround NEW: ISO C 9x
1021 fetestexcept NEW: ISO C 9x
1022 feupdateenv NEW: ISO C 9x
1023 fflush_locked REMOVED
1027 fgets_unlocked NEW: GNU ext.
1028 fileno_locked REMOVED
1040 fputc_locked REMOVED
1041 fputs_unlocked NEW: GNU ext.
1042 fread_unlocked NEW: GNU ext.
1047 fstatvfs NEW: Unix98
1051 ftruncate64 NEW: LFS
1053 fwrite_unlocked NEW: GNU ext.
1054 gai_strerror NEW: IPv6
1058 getchar_locked REMOVED
1060 getdate_err NEW: Unix98
1061 getdate_r NEW: GNU ext.
1063 getnameinfo NEW: IPv6
1064 getnetname NEW: Secure RPC
1065 getpmsg NEW: STREAMS
1066 getpt NEW: Unix98 PTY
1067 getrlimit64 NEW: LFS
1068 getutxent NEW: Unix98
1069 getutxid NEW: Unix98
1070 getutxline NEW: Unix98
1071 glob64 NEW: GNU ext.
1072 globfree64 NEW: GNU ext.
1073 gnu_get_libc_release NEW: GNU ext.
1074 gnu_get_libc_version NEW: GNU ext.
1075 grantpt NEW: Unix98 PTY
1076 host2netname NEW: Secure RPC
1078 iconv_close NEW: iconv
1079 iconv_open NEW: iconv
1080 if_freenameindex NEW: IPv6
1081 if_indextoname NEW: IPv6
1082 if_nameindex NEW: IPv6
1083 if_nametoindex NEW: IPv6
1084 in6addr_any NEW: IPv6
1085 in6addr_loopback NEW: IPv6
1086 inet6_isipv4mapped NEW: IPv6
1087 isastream NEW: STREAMS
1088 iswblank NEW: GNU ext.
1089 key_decryptsession NEW: Secure RPC
1090 key_decryptsession_pk NEW: Secure RPC
1091 key_encryptsession NEW: Secure RPC
1092 key_encryptsession_pk NEW: Secure RPC
1093 key_gendes NEW: Secure RPC
1094 key_get_conv NEW: Secure RPC
1095 key_secretkey_is_set NEW: Secure RPC
1096 key_setnet NEW: Secure RPC
1097 key_setsecret NEW: Secure RPC
1098 llrint NEW: ISO C 9x
1099 llrintf NEW: ISO C 9x
1100 llrintl NEW: ISO C 9x
1101 llround NEW: ISO C 9x
1102 llroundf NEW: ISO C 9x
1103 llroundl NEW: ISO C 9x
1108 lrintf NEW: ISO C 9x
1109 lrintl NEW: ISO C 9x
1110 lround NEW: ISO C 9x
1111 lroundf NEW: ISO C 9x
1112 lroundl NEW: ISO C 9x
1114 makecontext NEW: Unix98
1115 mempcpy NEW: GNU ext.
1118 modify_ldt NEW: kernel
1122 nearbyint NEW: ISO C 9x
1123 nearbyintf NEW: ISO C 9x
1124 nearbyintl NEW: ISO C 9x
1125 netname2host NEW: Secure RPC
1126 netname2user NEW: Secure RPC
1127 nexttoward NEW: ISO C 9x
1128 nexttowardf NEW: ISO C 9x
1129 nexttowardl NEW: ISO C 9x
1133 passwd2des NEW: Secure RPC
1135 pow10f NEW: GNU ext.
1136 pow10l NEW: GNU ext.
1139 printf_size NEW: GNU ext.
1140 printf_size_info NEW: GNU ext.
1141 profil_counter REMOVED
1142 pthread_mutexattr_getkind_np REPLACED
1143 pthread_mutexattr_setkind_np REPLACED
1144 ptsname NEW: Unix98 PTY
1145 ptsname_r NEW: Unix98 PTY
1147 putchar_locked REMOVED
1148 putgrent NEW: GNU ext.
1150 putpmsg NEW: STREAMS
1151 pututxline NEW: Unix98
1155 readdir64_r NEW: LFS
1156 remquo NEW: ISO C 9x
1157 remquof NEW: ISO C 9x
1158 remquol NEW: ISO C 9x
1160 roundf NEW: ISO C 9x
1161 roundl NEW: ISO C 9x
1163 scalbln NEW: ISO C 9x
1164 scalblnf NEW: ISO C 9x
1165 scalblnl NEW: ISO C 9x
1167 sendfile NEW: kernel
1168 setcontext NEW: Unix98
1169 setrlimit64 NEW: LFS
1170 setutxent NEW: Unix98
1172 sigignore NEW: Unix98
1173 sigqueue NEW: POSIX.1b
1174 sigrelse NEW: Unix98
1175 sigset NEW: POSIX.1b
1176 sigtimedwait NEW: POSIX.1b
1177 sigwaitinfo NEW: POSIX.1b
1178 sincos NEW: GNU ext.
1179 sincosf NEW: GNU ext.
1180 sincosl NEW: GNU ext.
1184 strcasestr NEW: GNU ext.
1185 strtoimax NEW: ISO C 9x
1186 strtoumax NEW: ISO C 9x
1187 strverscmp NEW: GNU ext.
1188 svcauthdes_stats NEW: Secure RPC
1189 svcunix_create NEW: sunrpc etx
1190 svcunixfd_create NEW: sunrpc ext
1191 swapcontext NEW: Unix98
1192 tcgetsid NEW: Unix98 PTY
1193 tdestroy NEW: GNU ext.
1194 tgamma NEW: ISO C 9x
1195 tgammaf NEW: ISO C 9x
1196 tgammal NEW: ISO C 9x
1200 truncf NEW: ISO C 9x
1201 truncl NEW: ISO C 9x
1203 unlockpt NEW: Unix98 PTY
1204 updwtmpx NEW: Unix98
1205 user2netname NEW: Secure RPC
1206 utmpxname NEW: Unix98
1207 versionsort NEW: GNU ext.
1208 versionsort64 NEW: GNU ext.
1210 wcscasecmp NEW: GNU ext.
1211 wcsncasecmp NEW: GNU ext.
1212 wcsnlen NEW: GNU ext.
1213 wcstoimax NEW: ISO C 9x
1214 wcstoll NEW: ISO C 9x
1215 wcstoull NEW: ISO C 9x
1216 wcstoumax NEW: ISO C 9x
1218 wordexp NEW: POSIX.2
1219 wordfree NEW: POSIX.2
1220 write_profiling REMOVED
1221 xdecrypt NEW: Secure RPC
1222 xdr_authdes_cred NEW: Secure RPC
1223 xdr_authdes_verf NEW: Secure RPC
1224 xdr_cryptkeyarg NEW: Secure RPC
1225 xdr_cryptkeyarg2 NEW: Secure RPC
1226 xdr_cryptkeyres NEW: Secure RPC
1227 xdr_getcredres NEW: Secure RPC
1228 xdr_key_netstarg NEW: Secure RPC
1229 xdr_key_netstres NEW: Secure RPC
1230 xdr_keybuf NEW: Secure RPC
1231 xdr_keystatus NEW: Secure RPC
1232 xdr_netnamestr NEW: Secure RPC
1233 xdr_sizeof NEW: Secure RPC
1234 xdr_unixcred NEW: sunrpc ext
1235 xencrypt NEW: Secure RPC
1236 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
1247 * inet_ntoa is thread-safe
1249 * updwtmp is moved from libutil to libc
1251 * rewrite of cbrt function
1253 * update of timezone data
1267 * add atoll function
1269 * fix complex problems in Berkeley DB code
1271 * fix math functions
1275 * fixed lots of header problems (especially Linux/GNU specific)
1277 * dynamic loader preserves all registers
1279 * Roland McGrath provided support for handling of auxiliary objects in
1280 the ELF dynamic loader.
1282 * support for parallel builds is improved
1286 * GNU extensions are no longer declared by default. To enable them you
1287 must define the macro `_GNU_SOURCE' in your program or compile with
1290 * The library has changed from using GNU ld symbol aliases to using weak
1291 symbols where available. The ELF object file format supports weak
1292 symbols; GNU ld also supports weak symbols in the a.out format. (There
1293 is also now support for other GNU ld extensions in ELF. Use the
1294 `--with-elf' option to configure to indicate you have ELF, and
1295 `--with-gnu-ld' if using GNU ld.) This change resulted in the deletion
1296 of many files which contained only symbol aliases, reducing the size of
1297 the source and the compiled library; many other files were renamed to
1298 less cryptic names previously occupied by the symbol alias files.
1299 There is a new header file <elf.h> for programs which operate on
1300 files in the ELF format.
1302 * Converted to Autoconf version 2, so `configure' has more options.
1303 Run `configure --help' to see the details.
1305 * The library can now be configured to build profiling, highly-optimized
1306 (but undebuggable), and/or shared libraries (ELF with GNU ld only). The
1307 `--enable-profile', `--enable-omitfp', and `--enable-shared' options to
1308 `configure' enable building these extra libraries. The shared library is
1309 built by default when using both ELF and GNU ld. When shared libraries
1310 are enabled, the new library `-ldl' is available for arbitrary run-time
1311 loading of shared objects; its interface is defined in <dlfcn.h>. The
1312 new header file <link.h> gives access to the internals of the run-time
1313 dynamic linker, `ld.so'. The shell script `ldd' is similar to the
1314 application of same name on other systems and it provides information
1315 about dynamically linked binaries.
1317 * The C library now provides the run-time support code for profiling
1318 executables compiled with `-pg'. Programs can control the profiling code
1319 through the interface in <sys/gmon.h>. The `gmon.out' files written by
1320 the GNU C library can be read only by GNU `gprof' (from GNU binutils);
1321 the support for this file format was contributed by David Mosberger-Tang.
1323 * The math code has been replaced with a math library based on fdlibm from
1324 Sun, and modified by JT Conklin and Ulrich Drepper with i387 support, by
1325 Ian Taylor with `float' functions and by Ulrich Drepper with `long double'
1326 functions. The math functions now reside in a separate library, so
1327 programs using them will need to use `-lm' their linking commands.
1329 * John C. Bowman contributed optimized ix87 assembler inline functions.
1331 * Ulrich Drepper has contributed support for an `/etc/nsswitch.conf'
1332 mechanism similar to that found in Solaris 2. This is now used for the
1333 group, passwd, hosts, networks, services, protocols, rpc, ethers,
1334 shadow, netgroup, publickey, and alias databases. The `nsswitch.conf'
1335 file controls what services are used for each individual database. This
1336 works by loading shared libraries with names specified in `nsswitch.conf',
1337 so service modules can be changed or added at any time without even
1338 relinking any program. Currently there are the file, db, and NIS based
1339 NSS services available.
1341 * The new functions `strtoq' and `strtouq' parse integer values from
1342 strings, like `strtol' and `strtoul', but they return `long long int' and
1343 `unsigned long long int' values, respectively (64-bit quantities).
1345 * The new functions `strtof' and `strtold' parse floating-point values from
1346 strings, like `strtod', but they return `float' and `long double' values,
1347 respectively (on some machines `double' and `long double' are the same).
1349 * Ulrich Drepper has contributed new implementations of the floating-point
1350 printing and reading code used in the `printf' family of functions and
1351 `strtod', `strtof', and `strtold'. These new functions are perfectly
1352 accurate, and much faster than the old ones.
1354 * The implementation of the POSIX locale model was completely rewritten by
1355 Ulrich Drepper. This includes the new programs `localedef' and `locale'
1356 to compile the POSIX locale definition.
1358 * The former dummy implementations of the strcoll and strxfrm function are
1359 now replaced by fully functional code contributed by Ulrich Drepper. The
1360 collation information comes from the POSIX locale definitions.
1362 * The new header <langinfo.h> defines an interface for accessing
1363 various locale-dependent data (using the locale chosen with `setlocale').
1365 * Ulrich Drepper has contributed a new suite of functions for operation on
1366 wide-character and multibyte-character strings, in <wchar.h>;
1367 and classification and case conversion of wide characters, in <wctype.h>.
1368 These new functions are conforming to the ISO C, Amendement 1 specification.
1370 * There is now a second implementation of the standard I/O library available.
1371 It comes from GNU libg++ as was written by Per Bothner, heavily modified
1372 by Hongjiu Lu and made thread safe by Ulrich Drepper.
1374 * You can now use positional parameter specifications in format strings
1375 for the `printf' and `scanf' families of functions. For example,
1376 `printf ("Number %2$d, Mr %1$s\n", "Jones", 6);'' prints
1377 ``Number 6, Mr Jones''. This is mainly useful when providing different
1378 format strings for different languages, whose grammars may dictate
1379 different orderings of the values being printed. To support this
1380 feature, the interface for `register_printf_handler' has changed; see
1381 the header file <printf.h> for details.
1383 * The `printf' and `scanf' families of functions now understand a new
1384 formatting flag for numeric conversions: the ' flag (e.g. %'d or %'f) says
1385 to group numbers as indicated by the locale; for `scanf' and friends, this
1386 says to accept as valid only a number with all the proper grouping
1387 separators in the right places. In the default "C" locale, numbers are
1388 not grouped; but locales for specific countries will define the usual
1389 conventions (i.e. separate thousands with `,' in the US locale).
1391 * The pgrp functions have been regularized, slightly incompatibly but much
1392 less confusingly. The core functions are now `getpgid' and `setpgid',
1393 which take arguments for the PID to operate on; the POSIX.1 `getpgrp' (no
1394 argument) and BSD `setpgrp' (identical to `setpgid') functions are
1395 provided for compatibility. There is no longer an incompatible `getpgrp'
1396 with an argument declared under _BSD_SOURCE; no BSD code uses it.
1398 * The new header file <fts.h> and suite of functions simplify programs that
1399 operate on directory trees. This code comes from 4.4 BSD.
1401 * The resolver code has been updated from the BIND 4.9.5-P1 release.
1402 Parts of the code were heavily modified by Ulrich Drepper to fit in the
1403 NSS scheme used in glibc.
1405 * There is a new malloc debugging hook `__memalign_hook'.
1407 * There are new typedefs `ushort' for `unsigned short int' and `uint' for
1408 `unsigned int' in <sys/types.h>. These are for compatibility only and
1409 their use is discouraged.
1411 * The `-lmcheck' library to enable standard malloc debugging hooks is now
1412 done differently, so that it works even without GNU ld.
1414 * New function `euidaccess' checks allowed access to a file like `access',
1415 but using the effective IDs instead of the real IDs.
1417 * The time zone data files have been updated for the latest and greatest
1418 local time conventions of the countries of the world.
1420 * The new function `dirfd' extracts the file descriptor used by a DIR stream;
1423 * The new functions `ecvt', `fcvt', and `gcvt' provide an obsolete interface
1424 for formatting floating-point numbers. They are provided only for
1425 compatibility; new programs should use `sprintf' instead. There are
1426 also equivalent function for the `long double' floating-point type and
1427 all functions also exist in a reentrant form.
1429 * The new auxiliary library `-lutil' from 4.4 BSD contains various
1430 functions for maintaining the login-record files (primarily of use to
1431 system programs such as `login'), and convenient functions for
1432 allocating and initializing a pseudo-terminal (pty) device.
1434 * Ulrich Drepper has contributed new support for System V style
1435 shared memory and IPC on systems that support it.
1437 * Ulrich Drepper has contributed several miscellaneous new functions found
1438 in System V: The `hsearch' family of functions provide an effective
1439 implementation of hash tables; `a64l' and `l64a' provide a very simple
1440 binary to ASCII mapping; `drand48' and friends provide a 48-bit random
1443 * Ulrich Drepper has contributed new reentrant counterparts for the
1444 `random' and `hsearch' families of functions; `random_r', `hsearch_r', etc.
1446 * Ulrich Drepper has contributed new, highly-optimized versions of several
1447 string functions for the i486/Pentium family of processors.
1449 * Ulrich Drepper has updated the Linux-specific code, based largely
1450 on work done in Hongjiu Lu's version of GNU libc for Linux.
1451 The GNU library now supports Linux versions 2.0.10 and later,
1452 using the ELF object file format (i[3456]86-*-linux).
1454 * Andreas Schwab has ported the C library to Linux/m68k (m68k-*-linux).
1456 * David Mosberger-Tang and Richard Henderson have ported the C library
1457 to Linux/Alpha (alpha-*-linux). Richard Henderson contributed the
1458 dynamic linking support for ELF/Alpha.
1460 * Richard Henderson contributed several Alpha optimized assembler function
1461 for arithmetic and string handling.
1463 * Ulrich Drepper has contributed a new set of message catalog functions to
1464 support multiple languages using the <libintl.h> interface, for use with
1465 his new package GNU gettext. Translation volunteers have contributed
1466 catalogs of the library's messages in Spanish, German, and Korean.
1468 * For compatibility with XPG4, Ulrich Drepper has contributed the `gencat'
1469 program and the `catgets' function for reading the catalog files it
1470 creates. (The <libintl.h> interface is preferred; we include the
1471 <nl_types.h> interface using `catgets' only for source compatibility with
1472 programs already written to use it.)
1474 * New header file <values.h> gives SVID-compatible names for <limits.h>
1477 * Various new macros, declarations, and small header files for compatibility
1480 * New function `group_member' is a convenient way to check if a process has
1481 a given effective group ID.
1483 * When using GCC 2.7 and later, the socket functions are now declared in a
1484 special way so that passing an argument of type `struct sockaddr_in *',
1485 `struct sockaddr_ns *', or `struct sockaddr_un *' instead of the generic
1486 `struct sockaddr *' type, does not generate a type-clash warning.
1488 * New function `error' declared in header file <error.h> is a convenient
1489 function for printing error messages and optionally exiting; this is the
1490 canonical function used in GNU programs. The new functions `err', `warn',
1491 and friends in header file <err.h> are the canonical 4.4 BSD interface for
1492 doing the same thing.
1494 * The <glob.h> interface has several new flags from 4.4 BSD that extend the
1495 POSIX.2 `glob' function to do ~ and {...} expansion.
1497 * New function `unsetenv' complements `setenv' for compatibility with 4.4 BSD.
1498 `clearenv' which is used in POSIX.9 is also available.
1500 * New function `getsid' returns session ID number on systems that support it.
1502 * We have incorporated the 4.4 BSD `db' library (version 1.85). New header
1503 files <db.h> and <mpool.h> provide a rich set of functions for several
1504 types of simple databases stored in memory and in files, and <ndbm.h> is
1505 an old `ndbm'-compatible interface using the `db' functions. Link with
1506 `-ldb' to get these functions.
1508 * New macro `strdupa' copies a string like `strdup', but uses local stack
1509 space from `alloca' instead of dynamic heap space from `malloc'.
1511 * New function `strnlen' is like `strlen' but searches only a given maximum
1512 number of characters for the null terminator. `stpncpy', `strndup' and
1513 `strndupa' are similar variants for the `stpcpy', `strdup' and `strdupa'
1516 * New function `statfs' in header <sys/statfs.h>.
1518 * The new <argz.h> and <envz.h> interfaces contributed by Miles Bader
1519 provide convenient functions for operating on blocks of null-terminated
1522 * A new suite of functions in <utmp.h> handle all the details of reading
1523 and writing the utmp file.
1525 * An implementation of the NIS/YP(tm) based NSS service was contributed by
1528 * Paul Eggert and Ulrich Drepper modified the `strftime' function to be
1529 completely POSIX compliant and also implemented the extended functionality
1530 to handle alternate digit representation and alternate era date formats.
1532 * Ulrich Drepper provided an implementation of the `strptime' function
1533 defined in XPG4.2 which transforms a string into a `struct tm' value.
1535 * Paul Eggert provided the tzselect shell script as part of the timezone
1536 code. The shell script makes it easy to select the correct timezone
1539 * The implementation of the malloc family of functions is completely replaced
1540 by a new implementation by Doug Lea with many improvements by Wolfram Gloger.
1541 The implementation uses the mmap function (if available) and it is
1542 optimized for the use in multi threaded programs.
1544 * Ulrich Drepper contributed a MD5 "encryption" for the crypt family of
1545 functions. This new functionality is usable by specifying a special
1546 salt string and it is compatible with implementation on *BSD systems.
1548 * Lots of functions from the XPG4.2 standard were added by Ulrich Drepper:
1549 `getsubopt' to handle second level command line options, `bsd_signal'
1550 to access BSD style `signal' functionality, the obsolete `regexp' style
1553 * the `lchown' function is available on system which support this
1556 * The implementation of the shadow password handling function was contributed
1559 * David Mosberger-Tang changed the SunRPC implementation to be 64bit safe.
1561 * POSIX.1g support was added. The <sys/select.h> header is available,
1562 `isfdtype' and `pselect' are implemented. Craig Metz contributed an
1563 implementation of `getaddrinfo'.
1567 * For cross-compilation you should now set `BUILD_CC' instead of `HOST_CC'.
1569 * New header file <fstab.h> and new functions `getfsspec', `getfsent' and
1570 friends, for parsing /etc/fstab. This code comes from 4.4 BSD.
1572 * The new function `daemon' from 4.4 BSD is useful for server programs that
1573 want to put themselves in the background.
1575 * Joel Sherrill has contributed support for several standalone boards that
1576 run without an operating system.
1578 * `printf', `scanf' and friends now accept a `q' type modifier for long
1579 long int as well as `ll'. Formats using these might be `%qu' or `%lld'.
1581 * All of the code taken from BSD (notably most of the math and networking
1582 routines) has been updated from the BSD 4.4-Lite release.
1584 * The resolver code has been updated from the BIND-4.9.3-BETA9 release.
1586 * The new functions `getdomainname' and `setdomainname' fetch or change the
1587 YP/NIS domain name. These are system calls which exist on systems which
1590 * The time zone data files have been updated for the latest international
1593 * The SunRPC programs `portmap' and `rpcinfo' are now installed in
1594 $(sbindir) (usually /usr/local/sbin) instead of $(bindir).
1598 * The C library now includes support for Sun RPC, from Sun's free
1599 RPCSRC-4.0 distribution. The `portmap', `rpcinfo', and `rpcgen' programs
1600 are included. (There is still no support for YP.)
1602 * Tom Quinn has contributed a port of the C library to SGI machines running
1603 Irix 4 (mips-sgi-irix4).
1605 * The new `lockf' function is a simplified interface to the locking
1606 facilities of `fcntl', included for compatibility.
1608 * New time functions `timegm', `timelocal', and `dysize' for compatibility.
1610 * New header file <sys/timeb.h> and new function `ftime' for compatibility.
1612 * New header files <poll.h> and <sys/poll.h> and new function `poll' for
1615 * The error message printed by `assert' for a failed assertion now includes
1616 the name of the program (if using GNU ld) and the name of the calling
1617 function (with versions of GCC that support this).
1619 * The `psignal' function is now declared in <signal.h>, not <stdio.h>.
1621 * The library now includes the <sys/mman.h> header file and memory
1622 management functions `mmap', `munmap', `mprotect', `msync', and
1623 `madvise', on systems that support those facilities.
1625 * The interface for `mcheck' has changed slightly: the function called to
1626 abort the program when an allocation inconsistency is detected now takes
1627 an argument that indicates the type of failure. The new function
1628 `mprobe' lets you request a consistency check for a particular block at
1629 any time (checks are normally done only when you call `free' or `realloc'
1632 * It is now possible to easily cross-compile the C library, building on one
1633 system a library to run on another machine and/or operating system. All
1634 you need to do is set the variable `HOST_CC' in `configparms' to the
1635 native compiler for programs to run on the machine you are building on (a
1636 few generator programs are used on Unix systems); set `CC' to the
1639 * The new function `fexecve' (only implemented on the GNU system) executes
1640 a program file given a file descriptor already open on the file.
1644 * Brendan Kehoe has contributed most of a port to the DEC Alpha
1645 running OSF/1 (alpha-dec-osf1). He says it is 75% complete.
1647 * You can set the variable `libprefix' in `configparms' to specify a prefix
1648 to be prepended to installed library files; this makes it easy to install
1649 the GNU C library to be linked as `-lgnuc' or whatever.
1651 * The new `stpncpy' is a cross between `stpcpy' and `strncpy': It
1652 copies a limited number of characters from a string, and returns the
1653 address of the last character written.
1655 * You no longer need to check for whether the installed `stddef.h' is
1656 compatible with the GNU C library. configure now checks for you.
1658 * You can now define a per-stream `fileno' function to convert the
1659 stream's cookie into an integral file descriptor.
1661 * ``malloc (0)'' no longer returns a null pointer. Instead, it
1662 allocates zero bytes of storage, and returns a unique pointer which
1663 you can pass to `realloc' or `free'. The behavior is undefined if
1664 you dereference this pointer.
1666 * The C library now runs on Sony NEWS m68k machines running either
1667 NewsOS 3 or NewsOS 4.
1669 * The new `syscall' function is a system-dependent primitive function
1670 for invoking system calls. It has the canonical behavior on Unix
1671 systems, including unreliable return values for some calls (such as
1672 `pipe', `fork' and `getppid').
1674 * The error code `EWOULDBLOCK' is now obsolete; it is always defined
1675 to `EAGAIN', which is the preferred name. On systems whose kernels
1676 use two distinct codes, the C library now translates EWOULDBLOCK to
1677 EAGAIN in every system call function.
1681 * The GNU C Library Reference Manual is now distributed with the library.
1682 `make dvi' will produce a DVI file of the printed manual.
1683 `make info' will produce Info files that you can read on line using C-h i
1684 in Emacs or the `info' program.
1685 Please send comments on the manual to bug-glibc-manual@gnu.org.
1687 * The library now supports SVR4 on i386s (i386-unknown-sysv4).
1689 * Brendan Kehoe has contributed a port to Sun SPARCs running Solaris 2.
1691 * Jason Merrill has contributed a port to the Sequent Symmetry running
1692 Dynix version 3 (i386-sequent-dynix).
1694 * The library has been ported to i386s running SCO 3.2.4 (also known as SCO
1695 ODT 2.0; i386-unknown-sco3.2.4) or SCO 3.2 (i386-unknown-sco3.2).
1697 * New function `memory_warnings' lets you arrange to get warnings when
1698 malloc is running out of memory to allocate, like Emacs gives you.
1700 * The C library now contains the relocating allocator used in Emacs 19 for
1701 its editing buffers. This allocator (ralloc) minimizes allocation
1702 overhead and fragmentation by moving allocated regions around whenever it
1703 needs to. You always refer to a ralloc'd region with a "handle" (a
1704 pointer to a pointer--an object of type `void **').
1706 * There is a new `printf' format: `%m' gives you the string corresponding
1707 to the error code in `errno'.
1709 * In `scanf' formats, you can now use `%as' or `%a[' to do the normal `%s'
1710 or `%[' conversion, but instead of filling in a fixed-sized buffer you
1711 pass, the `a' modifier says to fill in a `char **' you pass with a
1714 * The `fnmatch' function supports the new flag bits `FNM_LEADING_DIR' and
1715 `FNM_CASEFOLD'. `FNM_LEADING_DIR' lets a pattern like `foo*' match a
1716 name like `foo/bar'. `FNM_CASEFOLD' says to ignore case in matching.
1718 * `mkstemp' is a traditional Unix function to atomically create and open a
1719 uniquely-named temporary file.
1723 * The standard location for the file that says what the local timezone is
1724 has changed again. It is now `/usr/local/etc/localtime' (or more
1725 precisely, `${prefix}/etc/localtime') rather than `/etc/localtime'.
1727 * The distribution no longer contains any files with names longer than 14
1730 * `struct ttyent' has two new flag bits: TTY_TRUSTED and TTY_CONSOLE.
1731 These are set by the new `trusted' and `console' keywords in `/etc/ttys'.
1733 * New functions `ttyslot' and `syslog' from 4.4 BSD.
1737 * The configuration process has changed quite a bit. The `configure'
1738 script is now used just like the configuration scripts for other GNU
1739 packages. The `sysdeps' directory hierarchy is much rearranged.
1740 The file `INSTALL' explains the new scheme in detail.
1742 * The header files no longer need to be processed into ANSI C and
1743 traditional C versions. There is just one set of files to install, and
1744 it will work with ANSI or old C compilers (including `gcc -traditional').
1746 * Brendan Kehoe and Ian Lance Taylor have ported the library to the
1747 MIPS DECStation running Ultrix 4.
1749 * The Sun 4 startup code (crt0) can now properly load SunOS 4 shared libraries.
1750 Tom Quinn contributed the initial code. The GNU C library can NOT yet be
1751 made itself into a shared library.
1753 * Yet further improved support for the i386, running 4.3 BSD-like systems
1754 (such as Mach 3 with the Unix single-server), or System V.
1756 * New function `strncasecmp' to do case-insensitive string comparison
1757 with limited length.
1759 * New function `strsep' is a reentrant alternative to `strtok'.
1761 * New functions `scandir' and `alphasort' for searching directories.
1763 * New function `setenv' is a better interface to `putenv'.
1765 * Ian Lance Taylor has contributed an implementation of the SVID `ftw'
1766 function for traversing a directory tree.
1768 * The GNU obstack package is now also part of the C library.
1769 The new function `open_obstack_stream' creates a stdio stream that
1770 writes onto an obstack; `obstack_printf' and `obstack_vprintf' do
1771 formatted output directly to an obstack.
1773 * Miscellaneous new functions: reboot, nice, sigaltstack (4.4 BSD only),
1774 cfmakeraw, getusershell, getpass, swab, getttyent, seteuid, setegid.
1776 * `FNM_FILE_NAME' is another name for `FNM_PATHNAME', used with `fnmatch'.
1778 * The new functions `strfry' and `memfrob' do mysterious and wonderful
1779 things to your strings.
1781 * There are some new test programs: test-fseek, testmb, and testrand.
1783 * Some work has been done to begin porting the library to 4.4 BSD and Linux.
1784 These ports are not finished, but are a good starting place for really
1785 supporting those systems.
1787 * `/etc/localtime' is now the standard location for the file that says what
1788 the local timezone is, rather than `/usr/local/lib/zoneinfo/localtime'.
1789 This follows the general principle that `/etc' is the place for all local
1790 configuration files.
1792 * The C library header files now use `extern "C"' when used by the C++
1793 compiler, so the C library should now work with C++ code.
1795 * The header file <bstring.h> is gone. <string.h> now declares bcopy,
1796 bcmp, bzero, and ffs. (Update: nowadays these functions are declared
1799 * Mike Haertel (of GNU e?grep and malloc fame) has written a new sorting
1800 function which uses the `merge sort' algorithm, and is said to be
1801 significantly faster than the old GNU `qsort' function. Merge sort is
1802 now the standard `qsort' function. The new algorithm can require a lot
1803 of temporary storage; so, the old sorting function is called when the
1804 required storage is not available.
1806 * The C library now includes Michael Glad's Ultra Fast Crypt, which
1807 provides the Unix `crypt' function, plus some other entry points.
1809 * The code and header files taken from 4.4 BSD have been updated with the
1810 latest files released from Berkeley.
1812 ----------------------------------------------------------------------
1813 Copyright information:
1815 Copyright (C) 1992-1999,2000,2001,2002,2003,2004,2005,2006
1816 Free Software Foundation, Inc.
1818 Permission is granted to anyone to make or distribute verbatim copies
1819 of this document as received, in any medium, provided that the
1820 copyright notice and this permission notice are preserved,
1821 thus giving the recipient permission to redistribute in turn.
1823 Permission is granted to distribute modified versions
1824 of this document, or of portions of it,
1825 under the above conditions, provided also that they
1826 carry prominent notices stating who last changed them.
1829 version-control: never