This is a variant of fgets which fails with ERANGE if the
buffer is too small, and the buffer length is given as an
argument of type size_t.
This function will be useful for implementing NSS file reading
operations. Compared to a direct implementation using the public API,
it avoids an lseek system call in case the line terminator can be
found in the internal read buffer.
Locking overhead can be significant in some stdio operations
that are common in single threaded applications.
This patch adds the _IO_FLAGS2_NEED_LOCK flag to indicate if
an _IO_FILE object needs to be locked and some of the stdio
functions just jump to their _unlocked variant when not. The
flag is set on all _IO_FILE objects when the first thread is
created. A new GLIBC_PRIVATE libc symbol, _IO_enable_locks,
was added to do this from libpthread.
The optimization can be applied to more stdio functions,
currently it is only applied to single flag check or single
non-wide-char standard operations. The flag should probably
be never set for files with _IO_USER_LOCK, but that's just a
further optimization, not a correctness requirement.
The optimization is valid in a single thread because stdio
operations are non-as-safe (so lock state is not observable
from a signal handler) and stdio locks are recursive (so lock
state is not observable via deadlock). The optimization is not
valid if a thread may be created while an stdio lock is taken
and thus it should be disabled if any user code may run during
an stdio operation (interposed malloc, printf hooks, etc).
This makes the optimization more complicated for some stdio
operations (e.g. printf), but those are bigger and thus less
important to optimize so this patch does not try to do that.
* libio/libio.h (_IO_FLAGS2_NEED_LOCK, _IO_need_lock): Define.
* libio/libioP.h (_IO_enable_locks): Declare.
* libio/Versions (_IO_enable_locks): New symbol.
* libio/genops.c (_IO_enable_locks): Define.
(_IO_old_init): Initialize flags2.
* libio/feof.c.c (_IO_feof): Avoid locking when not needed.
* libio/ferror.c (_IO_ferror): Likewise.
* libio/fputc.c (fputc): Likewise.
* libio/putc.c (_IO_putc): Likewise.
* libio/getc.c (_IO_getc): Likewise.
* libio/getchar.c (getchar): Likewise.
* libio/ioungetc.c (_IO_ungetc): Likewise.
* nptl/pthread_create.c (__pthread_create_2_1): Enable stdio locks.
* libio/iofopncook.c (_IO_fopencookie): Enable locking for the file.
* sysdeps/pthread/flockfile.c (__flockfile): Likewise.
This patch added a new fmemopen version, for glibc 2.22, that aims to be
POSIX complaint. It fixes some long-stading glibc fmemopen issues, such
as:
* it changes the way fseek with SEEK_END works on fmemopen to seek
relative to buffer size instead of first '\0'. This is default mode and
'b' opening mode does not change internal behavior (bz#6544).
* fix apending opening mode to use as start position either first null
byte of len specified in function call (bz#13152 and #13151).
* remove binary option 'b' and internal different handling (bz#12836)
* fix seek/SEE_END with negative values (bz#14292).
A compatibility symbol is provided to with old behavior for older symbols
version (2.2.5).
* include/stdio.h (fmemopen): Remove hidden prototype.
(__fmemopen): Add new hidden prototype.
* libio/Makefile: Add oldfmemopen object.
* libio/Versions [GLIBC_2.22]: Add new fmemopen symbol.
* libio/fmemopen.c (__fmemopen): Function rewrite to be POSIX
compliance.
* libio/oldfmemopen.c: New file: old fmemopen implementation for
symbol compatibility.
* stdio-common/Makefile [tests]: Add new tst-fmemopen3.
* stdio-common/psiginfo.c [psiginfo]: Call __fmemopen instead of
fmemopen.
* stdio-common/tst-fmemopen3.c: New file: more fmemopen tests, focus
on append and read mode.
* sysdeps/unix/sysv/linux/aarch64/libc.abilist [GLIBC_2.22]: Add
fmemopen.
* sysdeps/unix/sysv/linux/alpha/libc.abilist [GLIBC_2.22]: Likewise.
* sysdeps/unix/sysv/linux/arm/libc.abilist [GLIBC_2.22]: Likewise.
* sysdeps/unix/sysv/linux/i386/libc.abilist [GLIBC_2.22]: Likewise.
* sysdeps/unix/sysv/linux/ia64/libc.abilist [GLIBC_2.22]:
Likewise.
* sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist
[GLIBC_2.22]: Likewise.
* sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist [GLIBC_2.22]:
Likewise.
* sysdeps/unix/sysv/linux/microblaze/libc.abilist [GLIBC_2.22]:
Likewise.
* sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist
[GLIBC_2.22]: Likewise.
* sysdeps/unix/sysv/linux/mips/mips32/nofpu/libc.abilist
[GLIBC_2.22]: Likewise.
* sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist
[GLIBC_2.22]: Likewise.
* sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist
[GLIBC_2.22]: Likewise.
* sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist
[GLIBC_2.22]: Likewise.
* sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libc.abilist
[GLIBC_2.22]: Likewise.
* sysdeps/unix/sysv/linux/powerpc/powerpc64/libc.abilist
[GLIBC_2.22]: Likewise.
* sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist [GLIBC_2.22]:
Likewise.
* sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist [GLIBC_2.22]:
Likewise.
* sysdeps/unix/sysv/linux/sh/libc.abilist [GLIBC_2.22]: Likewise.
* sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist
[GLIBC_2.22]: Likewise.
* sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist
[GLIBC_2.22]: Likewise.
* sysdeps/unix/sysv/linux/tile/tilegx/tilegx32/libc.abilist
[GLIBC_2.22]: Likewise.
* sysdeps/unix/sysv/linux/tile/tilegx/tilegx64/libc.abilist
[GLIBC_2.22]: Likewise.
* sysdeps/unix/sysv/linux/tile/tilepro/libc.abilist [GLIBC_2.22]:
Likewise.
* sysdeps/unix/sysv/linux/x86_64/64/libc.abilist [GLIBC_2.22]:
Likewise.
* sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist [GLIBC_2.22]:
Likewise.
* sysdeps/unix/sysv/linux/hppa/libc.abilist [GLIBC_2.22]: Likewise.
* sysdeps/unix/sysv/linux/nios2/libc.abilist [GLIBC_2.22]: Likewise.
2000-06-04 Kaz Kylheku <kaz@ashi.footprints.net>
Lock for stdio stream list becomes global, for use in LinuxThreads.
* libio/genops.c (_IO_iter_begin, _IO_iter_end,
_IO_iter_next, _IO_iter_file, _IO_list_lock, _IO_list_unlock,
_IO_list_resetlock): New interface for iterating global list of
streams without accessing the _IO_list_all global variable,
and for manipulating the lock which protects this list.
* libio/libioP.h: Likewise.
* libio/Version: Add entries for the new functions.
* libio/libioP.h (_IO_ITER): New typedef, just an alias for
pointer to _IO_FILE.
1998-07-06 14:36 Andreas Schwab <schwab@issan.informatik.uni-dortmund.de>
* posix/Makefile (generated): Remove $(objpfx) from the names.
1998-07-05 Andreas Jaeger <aj@arthur.rhein-neckar.de>
* stdio-common/test_rdwr.c: Use %Zu for size_t in printf
format string.
* libio/iofread_u.c: Include <stdio.h> for prototype.
* libio/iofwrite_u.c: Likewise.
1998-07-06 Andreas Jaeger <aj@arthur.rhein-neckar.de>
* db2/Versions: New file.
1998-07-04 Andreas Schwab <schwab@issan.informatik.uni-dortmund.de>
* Makefile (lib-noranlib): Don't depend on sysd-versions.
($(common-objpfx)sysd-versions): Remove rule.
* Makerules ($(common-objpfx)sysd-versions): Define here instead.
Pass name of Versions.def file to script and redirect output to
target. Include it and make all generated version maps depend on
it.
* versions.awk: Print out variable definition containing all
generated version maps. Print error messages to stderr. Remove
temp file.
1998-07-04 Andreas Schwab <schwab@issan.informatik.uni-dortmund.de>
* posix/annexc.c (check_header): Terminate macro name before
comparing.
(get_null_defines): Allow builtin macros with parameters.
(fmt, testfmt): Add -D_LIBC.
* posix/Makefile: Remove bogus duplicate include directories from
annexc test command.
1998-07-06 12:04 Ulrich Drepper <drepper@cygnus.com>
* nis/nss_nis/nis-pwd.c (internal_nis_getpwent_r): Handle adjunct
password scheme.
(_nss_nis_getpwnam_r): Likewise.
(_nss_nis_getpwuid_r): Likewise.
1998-07-05 Mark Kettenis <kettenis@phys.uva.nl>
* libio/Versions: Move symbols whose source lives in
stdio-common to ...
* stdio-common/Versions: ... here.
* stdio/Versions: Add missing symbols.
1998-07-04 10:14 Ulrich Drepper <drepper@cygnus.com>
* libio/Makefile (routines): Add iofread_u and iofwrite_u.
* libio/Versions: Add fread_unlocked and fwrite_unlocked.
* Makerules (lib%.so): Adjust ignore pattern for last makefile change.
* time/tzfile.c (decode): Optimize by using bswap_32.
(__tzfile_read): Use _unlocked stream functions. Correct setting of
__tzname array values.
(__tzfile_compute): Correct setting of __tzname array values.
* time/tzset.c (__tzstring): Clean up a bit.
1998-06-29 19:01 Jim Wilson <wilson@cygnus.com>
* posix/regex.c (re_comp): Add cast to char * before gettext calls.
1998-06-30 Andreas Jaeger <aj@arthur.rhein-neckar.de>
* sysdeps/unix/bsd/poll.c (__poll): Allocate fd_set dynamically so
that fd can be bigger than FD_SETSIZE.
1998-07-01 Andreas Jaeger <aj@arthur.rhein-neckar.de>
* nscd/grpcache.c: Include <unistd.h>.
* nscd/pwdcache.c: Likewise.
* nis/nis_modify.c: Include <string.h>.
* nis/nis_add.c: Likewise.
* nis/nis_checkpoint.c: Likewise.
* posix/runptests.c: Likewise.
* sysdeps/generic/statvfs64.c: Likewise.
* sysdeps/generic/fstatvfs64.c: Likewise.
1998-07-03 13:16 Ulrich Drepper <drepper@cygnus.com>
* localedata/charmaps/ISO-8859-9: Change mapping for 0xea, 0xec, 0xef
to match data from Unicode.
Reported by Michael Deutschmann <michael@talamasca.wkpowerlink.com>.
1998-07-03 11:45 Ulrich Drepper <drepper@cygnus.com>
* stdio-common/printf.h: Define printf_function and
printf_arginfo_function types using __PMT not __P.
Reported by Marc Lehmann.
1998-07-02 14:07 -0400 Zack Weinberg <zack@rabi.phys.columbia.edu>
* assert/test-assert.c: New test.
* assert/test-assert-perr.c: New test.
* assert/Makefile (tests): Add test-assert and test-assert-perr.
1998-07-02 13:45 Zack Weinberg <zack@rabi.phys.columbia.edu>
BSD-style SCM_CREDS support.
* sysdeps/unix/sysv/linux/socket.h: Define struct cmsgcred and
SCM_CREDS.
* sysdeps/unix/sysv/linux/sendmsg.c: New file. Convert user
visible SCM_CREDS packet to what the kernel wants.
* sysdeps/unix/sysv/linux/recvmsg.c: New file. Convert
SCM_CREDS packet output by kernel to what users want.
* sysdeps/unix/sysv/linux/sendmsg.S: Moved to...
* sysdeps/unix/sysv/linux/__sendmsg.S: here.
* sysdeps/unix/sysv/linux/recvmsg.S: Moved to...
* sysdeps/unix/sysv/linux/__recvmsg.S: here.
* sysdeps/unix/sysv/linux/Makefile [subdir=socket]: Add
__sendmsg and __recvmsg to sysdep_routines.
* sysdeps/unix/sysv/linux/Dist: Add __sendmsg.S and __recvmsg.S.
1998-07-02 Thorsten Kukuk <kukuk@vt.uni-paderborn.de>
* nscd/grpcache.c: Fix gid pointer handling and debug messages.
* nscd/pwdcache.c: Fix uid pointer handling and debug messages.
* nscd/nscd.c: Check, if pthread_create fails.
1998-07-02 Andreas Jaeger <aj@arthur.rhein-neckar.de>
* stdio-common/test_rdwr.c (main): Use %Zu for size_t in printf
format strings.
* stdio-common/bug1.c (main): Likewise.
* stdio-common/bug5.c (main): Likewise.
* stdio-common/tstgetln.c (main): Likewise.
* elf/sprof.c (generate_call_graph): Likewise.
(load_shobj): Likewise.
* posix/runptests.c (main): Likewise.
* string/tst-strlen.c (main): Likewise.
* sysdeps/libm-ieee754/e_acos.c (__ieee754_acos): Remove unused
variable q3.
* sysdeps/libm-ieee754/e_asin.c (__ieee754_asin): Likewise
1998-07-03 Andreas Jaeger <aj@arthur.rhein-neckar.de>
* wctype/Versions: Add __towctrans.
Noticed by Alex Buell <alex.buell@tahallah.demon.co.uk>.
1998-07-02 Mark Kettenis <kettenis@phys.uva.nl>
* grp/initgroups.c (compat_call): Only call dynamically loaded
functions if they are really present.
1998-07-02 Mark Kettenis <kettenis@phys.uva.nl>
* sysdeps/unix/sysv/linux/bits/sched.h: Move __END_DECLS within
#ifdef that contains __BEGIN_DECLS.
1998-07-02 Andreas Schwab <schwab@issan.informatik.uni-dortmund.de>
* libio/iofwrite.c: Fix return value when size == 0.
1998-07-01 Andreas Schwab <schwab@issan.informatik.uni-dortmund.de>
* posix/Makefile (distribute): Add annexc.c.
(generated): Add $(objpfx)annexc and $(objpfx)annexc.out.
1998-07-01 Andreas Schwab <schwab@issan.informatik.uni-dortmund.de>
* sysdeps/unix/sysv/linux/Makefile (sysdep_headers): Add
bits/pthreadtypes.h here, and do not clobber headers.
* sysdeps/unix/sysv/linux/Dist: Add bits/pthreadtypes.h.
1998-07-03 Andreas Jaeger <aj@arthur.rhein-neckar.de>
* timezone/tst-timezone.c: Add tests for tzname variable.
1998-07-03 12:17 Zack Weinberg <zack@rabi.phys.columbia.edu>
* Makefile [versioning=yes]: Build the mapfiles with a pattern
rule that lists all of them as targets.
(sysd-versions): Depend only on Versions.def. Write a Makefile
fragment that defines $(vers-libs) based on contents of that file;
then include it.
(lib-noranlib): Depend on lib-mapfiles not sysd-versions.
(lib-mapfiles): New target, depends on sysd-versions and $(vers-libs).
Predicate all this on avoid-generated unset as well as versioning.
1998-07-03 14:35 Andreas Schwab <schwab@issan.informatik.uni-dortmund.de>
1998-07-02 21:51 Ulrich Drepper <drepper@cygnus.com>
* Makeconfig: Define list of subdirs as all-subdirs and make subdirs
a copy.
* Makefile: Add rules to generate map files.
(distribute): Remove libc.map, add Versions.def and versions.awk.
* Makerules: Change rules to find map files on common-objpfx.
* elf/Makefile: Likewise.
* md5-crypt/Makefile: Likewise.
* nis/Makefile (libnsl-map): Remove.
* Versions.def: New file.
* versions.awk: New file.
* argp/Versions: New file.
* assert/Versions: New file.
* catgets/Versions: New file.
* csu/Versions: New file.
* ctype/Versions: New file.
* db/Versions: New file.
* debug/Versions: New file.
* dirent/Versions: New file.
* elf/Versions: New file.
* gmon/Versions: New file.
* grp/Versions: New file.
* hesiod/Versions: New file.
* hurd/Versions: New file.
* iconv/Versions: New file.
* inet/Versions: New file.
* intl/Versions: New file.
* io/Versions: New file.
* libio/Versions: New file.
* linuxthreads/Versions: New file.
* locale/Versions: New file.
* login/Versions: New file.
* malloc/Versions: New file.
* math/Versions: New file.
* md5-crypt/Versions: New file.
* misc/Versions: New file.
* nis/Versions: New file.
* nss/Versions: New file.
* posix/Versions: New file.
* pwd/Versions: New file.
* resolv/Versions: New file.
* resource/Versions: New file.
* rt/Versions: New file.
* setjmp/Versions: New file.
* shadow/Versions: New file.
* signal/Versions: New file.
* socket/Versions: New file.
* stdio/Versions: New file.
* stdio-common/Versions: New file.
* stdlib/Versions: New file.
* streams/Versions: New file.
* string/Versions: New file.
* sunrpc/Versions: New file.
* sysdeps/alpha/Versions: New file.
* sysdeps/alpha/fpu/Versions: New file.
* sysdeps/i386/Versions: New file.
* sysdeps/sparc/Versions: New file.
* sysdeps/unix/sysv/Versions: New file.
* sysdeps/unix/sysv/linux/Versions: New file.
* sysdeps/unix/sysv/linux/alpha/Versions: New file.
* sysdeps/unix/sysv/linux/i386/Versions: New file.
* sysdeps/unix/sysv/linux/mips/Versions: New file.
* sysvipc/Versions: New file.
* termios/Versions: New file.
* time/Versions: New file.
* wcsmbs/Versions: New file.
* wctype/Versions: New file.
* libc.map: Removed.
* db/libdb.map: Removed.
* elf/libdl.map: Removed.
* hesiod/libnss_hesiod.map: Removed.
* hurd/libhurduser.map: Removed.
* hurd/libmachuser.map: Removed.
* linuxthreads/libpthread.map: Removed.
* locale/libBrokenLocale.map: Removed.
* login/libutil.map: Removed.
* math/libm.map: Removed.
* md5-crypt/libcrypt.map: Removed.
* nis/libnsl.map: Removed.
* nis/libnsl_compat.map: Removed.
* nis/libnss_nis.map: Removed.
* nis/libnss_nisplus.map: Removed.
* nss/libnss_db.map: Removed.
* nss/libnss_files.map: Removed.
* resolv/libnss_dns.map: Removed.
* resolv/libresolv.map: Removed.
* rt/librt.map: Removed.
* elf/dl-load.c (fillin_rpath): Fix test for trusted directory.
Fix typos.
* elf/rtld.c (process_dl_debug): Recognize 'all'.
(process_envvars): LD_BIND_NOW must be followed by y, Y, or 1.
* sysdeps/generic/elf/backtracesyms.c: Allocate string memory of
correct size.
* sysdeps/unix/sysv/linux/getsysstats.c (get_proc_path): Fix typo
in comment.
