Previously, a thread M invoking fork would acquire locks in this order:
(M1) malloc arena locks (in the registered fork handler)
(M2) libio list lock
A thread F invoking flush (NULL) would acquire locks in this order:
(F1) libio list lock
(F2) individual _IO_FILE locks
A thread G running getdelim would use this order:
(G1) _IO_FILE lock
(G2) malloc arena lock
After executing (M1), (F1), (G1), none of the threads can make progress.
This commit changes the fork lock order to:
(M'1) libio list lock
(M'2) malloc arena locks
It explicitly encodes the lock order in the implementations of fork,
and does not rely on the registration order, thus avoiding the deadlock.
* manual/examples/strncat.c: Remove.
This example was misleading, as the code would have undefined
behavior if "hello" was longer than SIZE. Anyway, the manual
shouldn't encourage strncpy+strncat for this sort of thing.
* manual/string.texi (Copying Strings and Arrays): Split into
three sections Copying Strings and Arrays, Concatenating Strings,
and Truncating Strings, as this section was way too long. All
cross-referenced changed. Add advice about string-truncation
functions. Remove misleading strncat example.
ChangeLog:
2013-12-16 Will Newton <will.newton@linaro.org>
* manual/memory.texi (Malloc Examples): Mention aligned_alloc.
(Aligned Memory Blocks): Add documentation for aligned_alloc
and suggest it as an alternative to posix_memalign.
(Hooks for Malloc): Document __memalign_hook is also called
for aligned_alloc. (Summary of Malloc): Add summary for
aligned alloc. Document __memalign_hook is also called
for aligned_alloc.
The current documentation suggests using memalign and valloc which
are now considered obsolete, so suggest using posix_memalign instead.
Also document the possible error return and errno values for memalign
and posix_memalign and improve documentation of __memalign_hook.
ChangeLog:
2013-12-16 Will Newton <will.newton@linaro.org>
* manual/memory.texi (Malloc Examples): Clarify default
alignment documentation. Suggest posix_memalign rather
than memalign or valloc.
(Aligned Memory Blocks): Remove suggestion to use memalign
or valloc. Remove obsolete comment about BSD.
Document memalign errno values and mark the function obsolete.
Document posix_memalign returned error codes. Mark valloc
as obsolete. (Hooks for Malloc): __memalign_hook is also
called for posix_memalign and valloc.
(Summary of Malloc): Add posix_memalign to function summary.
__memalign_hook is also called for posix_memalign and valloc.
The register keyword doesn't add any information to the examples
and is not useful for modern compilers.
ChangeLog:
2013-11-06 Will Newton <will.newton@linaro.org>
* manual/memory.texi (Malloc Examples): Remove register
keyword from examples.
2004-08-09 Paul Eggert <eggert@cs.ucla.edu>
[BZ #315]
* manual/memory.texi (Obstacks Data Alignment): The default
alignment is not 4: it is enough to hold any type of data.
Problem reported by Benno in
<http://sources.redhat.com/ml/libc-alpha/2004-08/msg00055.html>.
2005-08-29 Thomas Schwinge <schwinge@nic-nac-project.de>
[BZ #1261]
* manual/memory.texi (Hooks for Malloc): Correct prototype of
my_init_hook and definition of my_free_hook.
* iconvdata/TESTS: Add entries for IBM856, IBM930, IBM933, IBM935,
IBM937, IBM939, and IBM1046.
* iconvdata/testdata/IBM1046: New file.
* iconvdata/testdata/IBM930..UTF8: New file.
* iconvdata/testdata/IBM1046..UTF8: New file.
* iconvdata/testdata/IBM933: New file.
* iconvdata/testdata/IBM935: New file.
* iconvdata/testdata/IBM937: New file.
* iconvdata/testdata/IBM856..UTF8: New file.
* iconvdata/testdata/IBM939: New file.
* iconvdata/testdata/IBM933..UTF8: New file.
* iconvdata/testdata/IBM935..UTF8: New file.
* iconvdata/testdata/IBM930: New file.
* iconvdata/testdata/IBM856: New file.
* iconvdata/testdata/IBM937..UTF8: New file.
* iconvdata/testdata/IBM939..UTF8: New file.
Contributed by Masahide Washizawa <washi@yamato.ibm.co.jp>.
2000-11-01 Martin Buchholz <martin@xemacs.org>
* manual/memory.texi (Hooks for Malloc): Fix `caller' arg docs to
agree with implementation.
2000-11-01 Ulrich Drepper <drepper@redhat.com>
1999-01-11 Ulrich Drepper <drepper@cygnus.com>
* ctype/Versions [GLIBC_2.0]: Export __ctype32_b.
* include/wctype.h: Declare __iswctype.
* stdio-common/vfscanf.c (__vfscanf): Use __iswspace instead of
iswspace.
* wctype/Makefile (routines): Add wcextra_l.
* wctype/wcextra.c (iswblank): Implement function here and don't use
__iswctype.
(__iswblank_l): Move definition to...
* wctype/wcextra_l.c: ...here. New file.
* wctype/wcfuncs.c: Really implement functions and don't call
__iswctype or __towctrans.
* wctype/wctype.h: Change isw* and tow* macros. Don't call
__iswctype or __towctrans. Instead optimize constant argument case.
* iconv/gconv.h: Fix typos.
* iconv/skeleton.c: Fix typos. Optimize init function a bit.
Correctly emit escape sequence to return to initial state in
conversion function.
* iconvdata/iso-2022-jp.c (gconv_init): Correctly initialize
max_needed_to element.
* manual/mbyte.texi: Removed. This is now described in charset.texi.
* manual/charset.texi: New file.
* manual/Makefile (chapters): Replace mbyte by charset.
* manual/ctype.texi: Document wide character functions.
* manual/intro.texi: Fix reference to mbyte chapter.
* manual/lang.texi: Likewise.
* manual/locale.texi: Likewise.
* manual/stdio.texi: Likewise.
* manual/string.texi: Fix @node line for new charset chapter.
* manual/libc.texinfo (UPDATED): Updated. Also update copyright years.
* manual/memory.texi (savestring): Optimize code to give a good
example.
* manual/filesys.texi: Fix wording. Patches by Jim Meyering.
* nscd/nscd_getgr_r.c: Include stdint.h to get uintptr_t definition.
* nscd/nscd_getpw_r.c: Likewise.
* nscd/nscd_gethst_r.c: Likewise.
* stdlib/stdtold_l.c: Always include xlocale.h.
1999-01-11 Geoffrey Keating <geoffk@ozemail.com.au>
* stdlib/fpioconst.h (LDBL_MAX_10_EXP_LOG): Define to be same as
DBL_MAX_10_EXP_LOG if there is no long double.
(_fpioconst_pow10): Always use size as LDBL_MAX_10_EXP_LOG to match
printf_fp.c.
1999-01-10 Andreas Jaeger <aj@arthur.rhein-neckar.de>
* timezone/Makefile ($(testdata)/GB): Changed to ...
($(testdata)/Europe/London): ... for tst-timezone test.
($(objpfx)tst-timezone.out): Change GB to Europe/London.
* timezone/tst-timezone.c (main): Enable DST switching test,
change GB to Europe/London.
1999-01-10 Philip Blundell <philb@gnu.org>
* socket/Makefile (headers): Remove bits/sockunion.h.
1999-01-09 Philip Blundell <philb@gnu.org>
* socket/sys/socket.h: Don't include <bits/sockunion.h>.
* sysdeps/generic/bits/sockunion.h: Deleted.
* sysdeps/unix/sysv/linux/bits/sockunion.h: Likewise.
1999-01-08 H.J. Lu <hjl@gnu.org>
* io/fts.c (fts_close): Don't access memory after having it freed.
1998-11-16 Ulrich Drepper <drepper@cygnus.com>
* sysdeps/unix/opendir.c: Use o_directory_works differently. Treat
zero value as uninitialized so that variable can go into .bss.
* dirent/opendir-tst1.c: Print error strings to stdout.
* sysdeps/unix/sysv/linux/mmap64.c: New file. Empty.
* sysdeps/unix/sysv/linux/syscalls.list: Add mmap with mmap64 alias.
* sysdeps/unix/sysv/linux/arm/mmap.S: Add mmap64 alias.
* sysdeps/unix/sysv/linux/i386/mmap.S: Likewise.
* sysdeps/unix/sysv/linux/m68k/mmap.S: Likewise.
1998-11-16 Andreas Schwab <schwab@issan.cs.uni-dortmund.de>
* time/tzfile.c (__tzfile_read): Check that types[i].isdst is in
range.
1998-11-16 Ulrich Drepper <drepper@cygnus.com>
* libio/bits/stdio.h (fread_unlocked): Do handle zero size and number.
(fwrite_unlocked): Likewise.
1998-11-16 Andreas Schwab <schwab@issan.cs.uni-dortmund.de>
* libio/bits/stdio.h (fread_unlocked): Don't evaluate non-constant
twice. Don't bother handling zero size.
(frwite_unlocked): Likewise.
1998-11-15 Andreas Schwab <schwab@issan.cs.uni-dortmund.de>
* configure.in: Fix regex for makeinfo version string.
1998-11-15 Andreas Schwab <schwab@issan.cs.uni-dortmund.de>
* sunrpc/rpc_sample.c (write_sample_server): Avoid -Wparentheses
warning.
* sunrpc/rpc_svcout.c (write_program): Likewise.
1998-11-15 Andreas Schwab <schwab@issan.cs.uni-dortmund.de>
* time/Makefile (CFLAGS-test_time.c): Add -Wno-format.
1998-11-16 Ulrich Drepper <drepper@cygnus.com
* misc/sys/mman.h: Pretty print prototypes.
1998-11-15 Ulrich Drepper <drepper@cygnus.com
* misc/error.c (error): Don't use result of strerror_r call directly
since at least DEC Unix has a wrong return type.
Patch by Johan Danielsson <joda@pdc.kth.se>.
1998-11-16 Andreas Schwab <schwab@issan.cs.uni-dortmund.de>
1998-07-20 17:09 Ulrich Drepper <drepper@cygnus.com>
* shlib-versions: Remove definition for libSegFault.
* memory.texi: Comment out the relocating allocator description.
* manual/signal.texi: Remove reference to relocating allocator.
* manual/top-menu.texi: Regenerated.
* posix/fnmatch.c: Implement [: :] and change to recognize
^ as negation only when not _POSIXLY_CORRECT.
* sysdeps/generic/glob.c: Add several optimizations.
* posix/glob.h: Undefine __PMT to prevent warnings.
Reported by Roland McGrath.
* posix/regex.c: Define namespace macros only for _LIBC.
* sysdeps/arm/dl-machine.h: Fix typo.
* sysdeps/unix/sysv/sysv4/solaris2/sigpending.c: New file.
* sysdeps/unix/sysv/sysv4/solaris2/sigstack.c: New file.
* sysdeps/unix/sysv/sysv4/solaris2/sigwaitinfo.c: New file.
* sysdeps/unix/sysv/sysv4/solaris2/syscalls.list: Add sigaltstack,
sigpending, sigqueue, and sigtimedwait.
* sysdeps/unix/sysv/sysv4/solaris2/sparc/sparc32/syscall.S: New file.
* timezone/leapseconds: Update from tzdata1998f.
1998-07-18 Mark Kettenis <kettenis@phys.uva.nl>
* stdio/stdio.h [__USE_GNU]: Add prototype for fputs_unlocked.
* stdio/Versions [GLIBC_2.1]: Add fputs_unlocked.
* libio/stdio.h: Fix typo.
1998-07-19 Roland McGrath <roland@baalperazim.frob.com>
* sysdeps/mach/hurd/dl-sysdep.c (_dl_sysdep_start): #if 0 out the
magic memobj port arg parsing stuff. Fix it someday when we are ready
to really use it.
(_dl_sysdep_output): New function, modified from _dl_sysdep_error.
(_dl_sysdep_error, _dl_sysdep_message, _dl_sysdep_fatal): Removed.
1998-07-19 Roland McGrath <roland@baalperazim.frob.com>
* stdio/fputs.c: Add fputs_unlocked as weak alias for fputs.
1998-07-19 Roland McGrath <roland@baalperazim.frob.com>
* sysdeps/posix/sigsuspend.c: Define __sigsuspend with sigsuspend as
a weak alias.
* sysdeps/mach/hurd/sigsuspend.c: Likewise.
* sysdeps/generic/sigsuspend.c: Likewise.
1998-07-19 Roland McGrath <roland@baalperazim.frob.com>
* sysdeps/mach/hurd/i386/sigcontextinfo.h: New file.
1998-07-19 Andreas Schwab <schwab@issan.informatik.uni-dortmund.de>
* Makerules (map-file): Don't use $(wildcard) to find the
generated version script, instead look in $(version-maps).
($(common-objpfx)libc.so): Only depend on libc.map if versioning
is used.
* extra-lib.mk ($(objpfx)$(lib).so): Only depend on version script
if versioning is used. Don't use $(wildcard) to find the
generated version script, instead look in $(verson-maps).
1998-07-17 Andreas Schwab <schwab@issan.informatik.uni-dortmund.de>
* sysdeps/generic/segfault.c: Rename GET_EIP to GET_PC. Remove
unused function handle.
* sysdeps/generic/sigcontextinfo.h: Rename GET_EIP to GET_PC.
* sysdeps/unix/sysv/linux/i386/sigcontextinfo.h: Likewise.
* debug/catchsegv.sh: Fix argument processing, quoting and various
typos. Put the crash info always in the current directory. Find
program in $PATH if it contains no directory component.
* Makerules (install-lib.so-versioned,
install-lib.so-unversioned): New variables.
(install-lib-nosubdir): Depend on unversioned libs in
slibdir, not libdir.
1998-07-19 Andreas Schwab <schwab@issan.informatik.uni-dortmund.de>
* Make-dist (+tsrcs): Remove references to %-map variables and
*.map files. Add Versions in subdirs.
* Makerules (distinfo-vars): Don't write out %-map variables.
1998-07-20 13:55 Ulrich Drepper <drepper@cygnus.com>
* inet/protocols/rwhod.h: Remove definition of _PATH_RWHODIR.
Include <paths.h> instead.
* sysdeps/generic/paths.h: Define _PATH_RWHODIR.
* sysdeps/unix/sysv/linux/paths.h: Likewise.
Reported by Dale Scheetz <dwarf@polaris.net>.
1998-07-17 21:44 Ulrich Drepper <drepper@cygnus.com>
* catgets/open_catalog.c: Strictly check whether catalog file is
larger enough for the data. Reported by Andries.Brouwer@cwi.nl.
1998-03-23 07:52 H.J. Lu <hjl@gnu.org>
* elf/dl-close.c (_dl_close): Fix byte count while removing
the shared object from the global scope list and optimize
a little bit.
1998-03-22 Andreas Jaeger <aj@arthur.rhein-neckar.de>
* manual/filesys.texi (Scanning Directory Content): Add missing
closing brace.
(Scanning Directory Content): Fix text.
1998-03-22 Andreas Jaeger <aj@arthur.rhein-neckar.de>
* manual/memory.texi (Heap Consistency Checking): Add paragraph
explaining difference of -lmcheck and MALLOC_CHECK_.
1998-03-23 Andreas Jaeger <aj@arthur.rhein-neckar.de>
* sysdeps/unix/sysv/linux/fstatvfs.c (fstatvfs): Correct some
typos in comments.
1998-03-20 Andreas Schwab <schwab@issan.informatik.uni-dortmund.de>
* test-skeleton.c (main): Fix test for exit signal.
1998-03-22 Andreas Schwab <schwab@issan.informatik.uni-dortmund.de>
* sysdeps/generic/strtok_r.c: Undefine __strtok_r.
1998-03-22 Andreas Schwab <schwab@issan.informatik.uni-dortmund.de>
* sysdeps/generic/memcmp.c [_LIBC]: Define WORDS_BIGENDIAN as
appropriate.
1998-03-23 11:14 Andreas Schwab <schwab@issan.informatik.uni-dortmund.de>
* libc.map: Export __strtok_r.
1998-03-23 Ulrich Drepper <drepper@cygnus.com>
* posix/regex.c (re_compile_fastmap): Remove unused variable
num_regs and adjust comment.
Patch by Jim Meyering <meyering@ascend.com>.
* math/math.h (M_*l): Extend long double constants to be usable
for 128 bit floats. Patch by Richard Henderson.
1998-03-23 11:16 Andreas Schwab <schwab@issan.informatik.uni-dortmund.de>
Patch by Tim Waugh and Andreas Schwab.
1998-02-11 Andreas Jaeger <aj@arthur.rhein-neckar.de>
* manual/memory.texi (Using the Memory Debugger): Fix typo.
* math/libm-test.c (modf_test): Add one more test for modf.
1998-01-28 Andreas Jaeger <aj@arthur.rhein-neckar.de>
* manual/memory.texi (Heap Consistency Checking): mcheck is
declared in <mcheck.h>.
Suggested by Jochen Voss <voss@mathematik.uni-kl.de> [PR libc/438]
1998-01-28 Andreas Jaeger <aj@arthur.rhein-neckar.de>
* sysdeps/generic/memmem.c (memmem): An empty needle is at the
beginning of haystack.
1998-01-29 Andreas Jaeger <aj@arthur.rhein-neckar.de>
* nss/nss_files/files-service.c: Correct last patch.
1998-01-30 21:29 Ulrich Drepper <drepper@cygnus.com>
* sysdeps/unix/sysv/linux/sparc/sparc32/sigaction.c: Define
__libc_have_rt_sigs.
* sysdeps/sparc/sparc32/__longjmp.S: Define _SETJMP_H before
including <bits/setjmp.h>.
* sysdeps/sparc/sparc32/setjmp.S: Likewise.
Patch from the Debian glibc/SPARC package.
1997-12-12 07:57 H.J. Lu <hjl@gnu.org>
* sysdeps/alpha/bzero.S: Fix a typo.
* sysdeps/alpha/htonl.S: Ditto.
* sysdeps/alpha/htons.S: Ditto.
