1996-12-11 01:40:39 +00:00
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/* Handle locking of password file.
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2009-02-26 21:17:45 +00:00
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Copyright (C) 1996,1998,2000,2002,2007,2009 Free Software Foundation, Inc.
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1996-12-11 01:40:39 +00:00
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This file is part of the GNU C Library.
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Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996.
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1996-08-26 10:28:45 +00:00
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1996-12-11 01:40:39 +00:00
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The GNU C Library is free software; you can redistribute it and/or
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2001-07-06 04:58:11 +00:00
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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1996-08-26 10:28:45 +00:00
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1996-12-11 01:40:39 +00:00
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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2001-07-06 04:58:11 +00:00
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Lesser General Public License for more details.
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1996-08-26 10:28:45 +00:00
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2001-07-06 04:58:11 +00:00
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You should have received a copy of the GNU Lesser General Public
|
2012-02-09 23:18:22 +00:00
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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1996-08-26 10:28:45 +00:00
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#include <fcntl.h>
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1997-06-21 02:59:26 +00:00
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#include <bits/libc-lock.h>
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1996-08-26 10:28:45 +00:00
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#include <shadow.h>
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#include <signal.h>
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#include <string.h>
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#include <unistd.h>
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#include <sys/file.h>
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2007-08-11 02:56:12 +00:00
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#include <kernel-features.h>
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1996-08-26 10:28:45 +00:00
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/* Name of the lock file. */
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1996-12-11 01:40:39 +00:00
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#define PWD_LOCKFILE "/etc/.pwd.lock"
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1996-08-26 10:28:45 +00:00
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/* How long to wait for getting the lock before returning with an
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error. */
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#define TIMEOUT 15 /* sec */
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/* File descriptor for lock file. */
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static int lock_fd = -1;
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/* Prevent problems in multithreaded program by using mutex. */
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__libc_lock_define_initialized (static, lock)
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/* Prototypes for local functions. */
|
2000-05-23 08:43:26 +00:00
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static void noop_handler (int __sig);
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1996-08-26 10:28:45 +00:00
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/* We cannot simply return in error cases. We have to close the file
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and perhaps restore the signal handler. */
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#define RETURN_CLOSE_FD(code) \
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do { \
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if ((code) < 0 && lock_fd >= 0) \
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{ \
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1998-07-16 11:44:36 +00:00
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__close (lock_fd); \
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1996-08-26 10:28:45 +00:00
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lock_fd = -1; \
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} \
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__libc_lock_unlock (lock); \
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return (code); \
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} while (0)
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#define RETURN_RESTORE_HANDLER(code) \
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do { \
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/* Restore old action handler for alarm. We don't need to know \
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about the current one. */ \
|
1998-07-16 11:44:36 +00:00
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__sigaction (SIGALRM, &saved_act, NULL); \
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1996-08-26 10:28:45 +00:00
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RETURN_CLOSE_FD (code); \
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} while (0)
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#define RETURN_CLEAR_ALARM(code) \
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do { \
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/* Clear alarm. */ \
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alarm (0); \
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/* Restore old set of handled signals. We don't need to know \
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about the current one.*/ \
|
1998-07-16 11:44:36 +00:00
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__sigprocmask (SIG_SETMASK, &saved_set, NULL); \
|
1996-08-26 10:28:45 +00:00
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RETURN_RESTORE_HANDLER (code); \
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} while (0)
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int
|
2000-05-23 08:43:26 +00:00
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__lckpwdf (void)
|
1996-08-26 10:28:45 +00:00
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{
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sigset_t saved_set; /* Saved set of caught signals. */
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struct sigaction saved_act; /* Saved signal action. */
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sigset_t new_set; /* New set of caught signals. */
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struct sigaction new_act; /* New signal action. */
|
update from main archive 961211
Thu Dec 12 03:32:21 1996 Ulrich Drepper <drepper@cygnus.com>
* libio/_G_config.h: Add definition of _G_int16_t, _G_int32_t,
_G_uint16_t, _G_uin32_t, _G_HAVE_BOOL, _G_HAVE_MMAP, and
_G_ARGS.
Change libio buffer handling to allocate internal buffers using
mmap if possible.
* libio/filedoalloc.c (_IO_file_doallocate): Change call to
ALLOC_BUF.
* libio/genops.c (_IO_setb, _IO_default_finish): Change call
to FREE_BUF.
(_IO_default_doallocate): Change call to ALLOC_BUF.
* libio/libioP.h: Change definition of ALLOC_BUF and FREE_BUF
to use mmap/munmap when possible.
* libio/memstream.c: Don't use ALLOC_BUF, but directly malloc.
* libio/vasprintf.c: Likewise.
Patch by HJ Lu.
* libio/libio.h: Define NULL as __null only for gcc-2.8 and up.
* libio/libioP.h: Likewise.
* libio/fileops.c (_IO_file_read, _IO_file_write): Don't
restart syscall when EINTR was returned. Necessary for POSIX.1.
* libio/strops.c (_IO_str_overflow): Add cast to prevent warning.
* new-malloc/malloc.c (heap_trim): Correctly place parentheses to
prevent warnings.
* nis/Makefile: Remove rules for bsd-tools which are not part
of glibc.
Patch by Thorsten Kukuk.
* nis/ypclnt.c: Add prototype for xdr_free.
Add const to first parameter for __yp_bind.
* nis/nss_compat/compat-pwd.c (getpwent_next_netgr, getpwent_next_nis,
getpwent_next_file): Variable `p2len' must have type size_t.
* nis/nss_nis/nis-alias.c: Add casts to prevent warnings.
* nis/nss_nis/nis-ethers.c: Likewise.
* nis/nss_nis/nis-grp.c: Likewise.
* nis/nss_nis/nis-hosts.c: Likewise.
* nis/nss_nis/nis-network.c: Likewise.
* nis/nss_nis/nis-proto.c: Likewise.
* nis/nss_nis/nis-pwd.c: Likewise.
* nis/nss_nis/nis-rpc.c: Likewise.
* nis/nss_nis/nis-service.c: Likewise.
* nis/nss_nis/nis-spwd.c: Likewise.
* nis/rpcsvc/yp_prot.h (ypreq_key): Change type of members to
`const char *'.
(ypmaplist): Change member names to `map' and `next' and provide
#defines for old names.
Patch by Thorsten Kukuk.
* nss/nss_files/files-parse.c (parse_line, parse_list): Change
type for `datalen' parameter to size_t.
* shsdow/lckpwdf.c: Use fcntl forlocking, not flock.
* stdio-common/printf.c [USE_IN_LIBIO]: Provide alias _IO_printf
for printf.
* stdio-common/sscanf.c [USE_IN_LIBIO]: Provide alias _IO_sscanf
for sscanf.
Patch by HJ Lu.
* stdio-common/tmpfile.c: Update copyright.
* stdio-common/vfscanf.c: Correctly handle EINTR error from fgetc
function.
Don't eat white space for `C' format.
* stdlib/tst-strtol.c [~0UL != 0xffffffff]: Fix typo in test data.
* sysdeps/generic/abort.c: Update copyright. De-ANSI-declfy.
* sysdeps/i386/abort.c: Removed. This version does not use
signal SIGABRT.
* sysdeps/i386/fpu/__math.h: Define __NO_MATH_INLINES if not using
gcc-2.8 or up.
Patch by HJ Lu.
* sysdeps/posix/tempname.c: Test for error but EEXIST after open
call. If EMFILE, ENFILE, or EINTR return with error.
Wed Dec 11 14:43:52 1996 Ulrich Drepper <drepper@cygnus.com>
* gnu-versions.h: Set _GNU_OBSTACK_INTERFACE_VERSION back to 1.
We are compatible again.
* new-malloc/obstack.h (struct obstack): Add back alloc_failed bit
even though it is not used.
* malloc/obstack.h: Likewise.
* new-malloc/obstack.c (_obstack_begin, _obstack_begin_1): Initialize
alloc_failed bit to 0.
* time/strftime.c: Extend for Emacs' needs. Recognize field width,
%P format and `0' modifier.
Tue Dec 10 21:20:44 1996 Andreas Schwab <schwab@issan.informatik.uni-dortmund.de>
* Makerules (make-link): Don't discard exit codes of intermediate
commands. Always use rellns-sh if symbolic links are available.
Tue Dec 10 20:09:51 1996 Andreas Schwab <schwab@issan.informatik.uni-dortmund.de>
* sysdeps/unix/sysv/linux/netinet/in.h: Enclose #include
<linux/in.h> in __BEGIN_DECLS/__END_DECLS to avoid linkage
conflict of ntohs etc. in <asm/byteorder.h>.
1996-12-12 03:24:48 +00:00
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|
|
struct flock fl; /* Information struct for locking. */
|
1996-08-26 10:28:45 +00:00
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int result;
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if (lock_fd != -1)
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/* Still locked by own process. */
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return -1;
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/* Prevent problems caused by multiple threads. */
|
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|
__libc_lock_lock (lock);
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|
2007-08-11 02:56:12 +00:00
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|
int oflags = O_WRONLY | O_CREAT;
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|
#ifdef O_CLOEXEC
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oflags |= O_CLOEXEC;
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|
#endif
|
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|
lock_fd = __open (PWD_LOCKFILE, oflags, 0600);
|
1996-08-26 10:28:45 +00:00
|
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|
if (lock_fd == -1)
|
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|
|
/* Cannot create lock file. */
|
|
|
|
RETURN_CLOSE_FD (-1);
|
|
|
|
|
2007-08-11 02:56:12 +00:00
|
|
|
#ifndef __ASSUME_O_CLOEXEC
|
|
|
|
# ifdef O_CLOEXEC
|
|
|
|
if (__have_o_cloexec <= 0)
|
|
|
|
# endif
|
|
|
|
{
|
|
|
|
/* Make sure file gets correctly closed when process finished. */
|
2009-02-26 21:17:45 +00:00
|
|
|
int flags = __fcntl (lock_fd, F_GETFD, 0);
|
2007-08-11 02:56:12 +00:00
|
|
|
if (flags == -1)
|
|
|
|
/* Cannot get file flags. */
|
|
|
|
RETURN_CLOSE_FD (-1);
|
|
|
|
# ifdef O_CLOEXEC
|
|
|
|
if (__have_o_cloexec == 0)
|
|
|
|
__have_o_cloexec = (flags & FD_CLOEXEC) == 0 ? -1 : 1;
|
|
|
|
if (__have_o_cloexec < 0)
|
|
|
|
# endif
|
|
|
|
{
|
|
|
|
flags |= FD_CLOEXEC; /* Close on exit. */
|
|
|
|
if (__fcntl (lock_fd, F_SETFD, flags) < 0)
|
|
|
|
/* Cannot set new flags. */
|
|
|
|
RETURN_CLOSE_FD (-1);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
#endif
|
1996-08-26 10:28:45 +00:00
|
|
|
|
|
|
|
/* Now we have to get exclusive write access. Since multiple
|
|
|
|
process could try this we won't stop when it first fails.
|
|
|
|
Instead we set a timeout for the system call. Once the timer
|
|
|
|
expires it is likely that there are some problems which cannot be
|
|
|
|
resolved by waiting.
|
|
|
|
|
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|
It is important that we don't change the signal state. We must
|
|
|
|
restore the old signal behaviour. */
|
|
|
|
memset (&new_act, '\0', sizeof (struct sigaction));
|
|
|
|
new_act.sa_handler = noop_handler;
|
2002-08-03 22:26:33 +00:00
|
|
|
__sigfillset (&new_act.sa_mask);
|
1996-08-26 10:28:45 +00:00
|
|
|
new_act.sa_flags = 0ul;
|
|
|
|
|
|
|
|
/* Install new action handler for alarm and save old. */
|
1998-07-16 11:44:36 +00:00
|
|
|
if (__sigaction (SIGALRM, &new_act, &saved_act) < 0)
|
1996-08-26 10:28:45 +00:00
|
|
|
/* Cannot install signal handler. */
|
|
|
|
RETURN_CLOSE_FD (-1);
|
|
|
|
|
|
|
|
/* Now make sure the alarm signal is not blocked. */
|
2002-08-03 22:26:33 +00:00
|
|
|
__sigemptyset (&new_set);
|
2000-08-21 04:18:25 +00:00
|
|
|
__sigaddset (&new_set, SIGALRM);
|
1998-07-16 11:44:36 +00:00
|
|
|
if (__sigprocmask (SIG_UNBLOCK, &new_set, &saved_set) < 0)
|
1996-08-26 10:28:45 +00:00
|
|
|
RETURN_RESTORE_HANDLER (-1);
|
|
|
|
|
|
|
|
/* Start timer. If we cannot get the lock in the specified time we
|
|
|
|
get a signal. */
|
|
|
|
alarm (TIMEOUT);
|
|
|
|
|
|
|
|
/* Try to get the lock. */
|
update from main archive 961211
Thu Dec 12 03:32:21 1996 Ulrich Drepper <drepper@cygnus.com>
* libio/_G_config.h: Add definition of _G_int16_t, _G_int32_t,
_G_uint16_t, _G_uin32_t, _G_HAVE_BOOL, _G_HAVE_MMAP, and
_G_ARGS.
Change libio buffer handling to allocate internal buffers using
mmap if possible.
* libio/filedoalloc.c (_IO_file_doallocate): Change call to
ALLOC_BUF.
* libio/genops.c (_IO_setb, _IO_default_finish): Change call
to FREE_BUF.
(_IO_default_doallocate): Change call to ALLOC_BUF.
* libio/libioP.h: Change definition of ALLOC_BUF and FREE_BUF
to use mmap/munmap when possible.
* libio/memstream.c: Don't use ALLOC_BUF, but directly malloc.
* libio/vasprintf.c: Likewise.
Patch by HJ Lu.
* libio/libio.h: Define NULL as __null only for gcc-2.8 and up.
* libio/libioP.h: Likewise.
* libio/fileops.c (_IO_file_read, _IO_file_write): Don't
restart syscall when EINTR was returned. Necessary for POSIX.1.
* libio/strops.c (_IO_str_overflow): Add cast to prevent warning.
* new-malloc/malloc.c (heap_trim): Correctly place parentheses to
prevent warnings.
* nis/Makefile: Remove rules for bsd-tools which are not part
of glibc.
Patch by Thorsten Kukuk.
* nis/ypclnt.c: Add prototype for xdr_free.
Add const to first parameter for __yp_bind.
* nis/nss_compat/compat-pwd.c (getpwent_next_netgr, getpwent_next_nis,
getpwent_next_file): Variable `p2len' must have type size_t.
* nis/nss_nis/nis-alias.c: Add casts to prevent warnings.
* nis/nss_nis/nis-ethers.c: Likewise.
* nis/nss_nis/nis-grp.c: Likewise.
* nis/nss_nis/nis-hosts.c: Likewise.
* nis/nss_nis/nis-network.c: Likewise.
* nis/nss_nis/nis-proto.c: Likewise.
* nis/nss_nis/nis-pwd.c: Likewise.
* nis/nss_nis/nis-rpc.c: Likewise.
* nis/nss_nis/nis-service.c: Likewise.
* nis/nss_nis/nis-spwd.c: Likewise.
* nis/rpcsvc/yp_prot.h (ypreq_key): Change type of members to
`const char *'.
(ypmaplist): Change member names to `map' and `next' and provide
#defines for old names.
Patch by Thorsten Kukuk.
* nss/nss_files/files-parse.c (parse_line, parse_list): Change
type for `datalen' parameter to size_t.
* shsdow/lckpwdf.c: Use fcntl forlocking, not flock.
* stdio-common/printf.c [USE_IN_LIBIO]: Provide alias _IO_printf
for printf.
* stdio-common/sscanf.c [USE_IN_LIBIO]: Provide alias _IO_sscanf
for sscanf.
Patch by HJ Lu.
* stdio-common/tmpfile.c: Update copyright.
* stdio-common/vfscanf.c: Correctly handle EINTR error from fgetc
function.
Don't eat white space for `C' format.
* stdlib/tst-strtol.c [~0UL != 0xffffffff]: Fix typo in test data.
* sysdeps/generic/abort.c: Update copyright. De-ANSI-declfy.
* sysdeps/i386/abort.c: Removed. This version does not use
signal SIGABRT.
* sysdeps/i386/fpu/__math.h: Define __NO_MATH_INLINES if not using
gcc-2.8 or up.
Patch by HJ Lu.
* sysdeps/posix/tempname.c: Test for error but EEXIST after open
call. If EMFILE, ENFILE, or EINTR return with error.
Wed Dec 11 14:43:52 1996 Ulrich Drepper <drepper@cygnus.com>
* gnu-versions.h: Set _GNU_OBSTACK_INTERFACE_VERSION back to 1.
We are compatible again.
* new-malloc/obstack.h (struct obstack): Add back alloc_failed bit
even though it is not used.
* malloc/obstack.h: Likewise.
* new-malloc/obstack.c (_obstack_begin, _obstack_begin_1): Initialize
alloc_failed bit to 0.
* time/strftime.c: Extend for Emacs' needs. Recognize field width,
%P format and `0' modifier.
Tue Dec 10 21:20:44 1996 Andreas Schwab <schwab@issan.informatik.uni-dortmund.de>
* Makerules (make-link): Don't discard exit codes of intermediate
commands. Always use rellns-sh if symbolic links are available.
Tue Dec 10 20:09:51 1996 Andreas Schwab <schwab@issan.informatik.uni-dortmund.de>
* sysdeps/unix/sysv/linux/netinet/in.h: Enclose #include
<linux/in.h> in __BEGIN_DECLS/__END_DECLS to avoid linkage
conflict of ntohs etc. in <asm/byteorder.h>.
1996-12-12 03:24:48 +00:00
|
|
|
memset (&fl, '\0', sizeof (struct flock));
|
|
|
|
fl.l_type = F_WRLCK;
|
|
|
|
fl.l_whence = SEEK_SET;
|
1998-07-16 11:44:36 +00:00
|
|
|
result = __fcntl (lock_fd, F_SETLKW, &fl);
|
1996-08-26 10:28:45 +00:00
|
|
|
|
|
|
|
RETURN_CLEAR_ALARM (result);
|
|
|
|
}
|
|
|
|
weak_alias (__lckpwdf, lckpwdf)
|
|
|
|
|
|
|
|
|
|
|
|
int
|
2000-05-23 08:43:26 +00:00
|
|
|
__ulckpwdf (void)
|
1996-08-26 10:28:45 +00:00
|
|
|
{
|
|
|
|
int result;
|
|
|
|
|
|
|
|
if (lock_fd == -1)
|
|
|
|
/* There is no lock set. */
|
|
|
|
result = -1;
|
|
|
|
else
|
|
|
|
{
|
|
|
|
/* Prevent problems caused by multiple threads. */
|
1996-09-03 22:24:21 +00:00
|
|
|
__libc_lock_lock (lock);
|
1996-08-26 10:28:45 +00:00
|
|
|
|
1998-07-16 11:44:36 +00:00
|
|
|
result = __close (lock_fd);
|
1996-08-26 10:28:45 +00:00
|
|
|
|
|
|
|
/* Mark descriptor as unused. */
|
|
|
|
lock_fd = -1;
|
|
|
|
|
|
|
|
/* Clear mutex. */
|
|
|
|
__libc_lock_unlock (lock);
|
|
|
|
}
|
|
|
|
|
|
|
|
return result;
|
|
|
|
}
|
|
|
|
weak_alias (__ulckpwdf, ulckpwdf)
|
|
|
|
|
|
|
|
|
|
|
|
static void
|
2000-05-23 08:43:26 +00:00
|
|
|
noop_handler (int sig)
|
1996-08-26 10:28:45 +00:00
|
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{
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update from main archive 961211
Thu Dec 12 03:32:21 1996 Ulrich Drepper <drepper@cygnus.com>
* libio/_G_config.h: Add definition of _G_int16_t, _G_int32_t,
_G_uint16_t, _G_uin32_t, _G_HAVE_BOOL, _G_HAVE_MMAP, and
_G_ARGS.
Change libio buffer handling to allocate internal buffers using
mmap if possible.
* libio/filedoalloc.c (_IO_file_doallocate): Change call to
ALLOC_BUF.
* libio/genops.c (_IO_setb, _IO_default_finish): Change call
to FREE_BUF.
(_IO_default_doallocate): Change call to ALLOC_BUF.
* libio/libioP.h: Change definition of ALLOC_BUF and FREE_BUF
to use mmap/munmap when possible.
* libio/memstream.c: Don't use ALLOC_BUF, but directly malloc.
* libio/vasprintf.c: Likewise.
Patch by HJ Lu.
* libio/libio.h: Define NULL as __null only for gcc-2.8 and up.
* libio/libioP.h: Likewise.
* libio/fileops.c (_IO_file_read, _IO_file_write): Don't
restart syscall when EINTR was returned. Necessary for POSIX.1.
* libio/strops.c (_IO_str_overflow): Add cast to prevent warning.
* new-malloc/malloc.c (heap_trim): Correctly place parentheses to
prevent warnings.
* nis/Makefile: Remove rules for bsd-tools which are not part
of glibc.
Patch by Thorsten Kukuk.
* nis/ypclnt.c: Add prototype for xdr_free.
Add const to first parameter for __yp_bind.
* nis/nss_compat/compat-pwd.c (getpwent_next_netgr, getpwent_next_nis,
getpwent_next_file): Variable `p2len' must have type size_t.
* nis/nss_nis/nis-alias.c: Add casts to prevent warnings.
* nis/nss_nis/nis-ethers.c: Likewise.
* nis/nss_nis/nis-grp.c: Likewise.
* nis/nss_nis/nis-hosts.c: Likewise.
* nis/nss_nis/nis-network.c: Likewise.
* nis/nss_nis/nis-proto.c: Likewise.
* nis/nss_nis/nis-pwd.c: Likewise.
* nis/nss_nis/nis-rpc.c: Likewise.
* nis/nss_nis/nis-service.c: Likewise.
* nis/nss_nis/nis-spwd.c: Likewise.
* nis/rpcsvc/yp_prot.h (ypreq_key): Change type of members to
`const char *'.
(ypmaplist): Change member names to `map' and `next' and provide
#defines for old names.
Patch by Thorsten Kukuk.
* nss/nss_files/files-parse.c (parse_line, parse_list): Change
type for `datalen' parameter to size_t.
* shsdow/lckpwdf.c: Use fcntl forlocking, not flock.
* stdio-common/printf.c [USE_IN_LIBIO]: Provide alias _IO_printf
for printf.
* stdio-common/sscanf.c [USE_IN_LIBIO]: Provide alias _IO_sscanf
for sscanf.
Patch by HJ Lu.
* stdio-common/tmpfile.c: Update copyright.
* stdio-common/vfscanf.c: Correctly handle EINTR error from fgetc
function.
Don't eat white space for `C' format.
* stdlib/tst-strtol.c [~0UL != 0xffffffff]: Fix typo in test data.
* sysdeps/generic/abort.c: Update copyright. De-ANSI-declfy.
* sysdeps/i386/abort.c: Removed. This version does not use
signal SIGABRT.
* sysdeps/i386/fpu/__math.h: Define __NO_MATH_INLINES if not using
gcc-2.8 or up.
Patch by HJ Lu.
* sysdeps/posix/tempname.c: Test for error but EEXIST after open
call. If EMFILE, ENFILE, or EINTR return with error.
Wed Dec 11 14:43:52 1996 Ulrich Drepper <drepper@cygnus.com>
* gnu-versions.h: Set _GNU_OBSTACK_INTERFACE_VERSION back to 1.
We are compatible again.
* new-malloc/obstack.h (struct obstack): Add back alloc_failed bit
even though it is not used.
* malloc/obstack.h: Likewise.
* new-malloc/obstack.c (_obstack_begin, _obstack_begin_1): Initialize
alloc_failed bit to 0.
* time/strftime.c: Extend for Emacs' needs. Recognize field width,
%P format and `0' modifier.
Tue Dec 10 21:20:44 1996 Andreas Schwab <schwab@issan.informatik.uni-dortmund.de>
* Makerules (make-link): Don't discard exit codes of intermediate
commands. Always use rellns-sh if symbolic links are available.
Tue Dec 10 20:09:51 1996 Andreas Schwab <schwab@issan.informatik.uni-dortmund.de>
* sysdeps/unix/sysv/linux/netinet/in.h: Enclose #include
<linux/in.h> in __BEGIN_DECLS/__END_DECLS to avoid linkage
conflict of ntohs etc. in <asm/byteorder.h>.
1996-12-12 03:24:48 +00:00
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/* We simply return which makes the `fcntl' call return with an error. */
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1996-08-26 10:28:45 +00:00
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}
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