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authorRoland McGrath <roland@gnu.org>1996-05-22 02:11:55 +0000
committerRoland McGrath <roland@gnu.org>1996-05-22 02:11:55 +0000
commitb8fe19fa809ac786b7d3dbb464cb1b3f887dc69d (patch)
tree0758f3dea04af210777ee864f4fa99e7f107b29e /login/pututline_r.c
parent1b82a4a8cacdca3d02e98c1799b206da043d940c (diff)
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Wed May 22 01:48:54 1996 Ulrich Drepper <drepper@cygnus.com>
* stdlib/strtol.c [!QUAD] (ULONG_MAX, LONG_MAX): Define these macros if they are not available. (WEAKNAME): New macro to declare argument as weak. Define function with __ prefix and add normal name as weak alias. * sysdeps/posix/euidaccess.c (S_IROTH, S_IWOTH, S_IXOTH): Defines these macros if not already available based on R_OK, W_OK, and X_OK. Tue May 21 18:48:46 1996 Roland McGrath <roland@delasyd.gnu.ai.mit.edu> * misc/sys/syslog.h (__need___va_list): Define this instead of __need_va_list before including <stdarg.h>. * Makerules (o-iterator): Use $(object-suffixes-left) instead of $(object-suffixes) to produce repetitions; this is used for other lists than just that one. [versioned]: Use $(o-iterator) properly. * sysdeps/unix/sysv/linux/Implies: Include `gnu'. * sysdeps/mach/hurd/Implies: Likewise. Sat May 18 02:57:46 1996 Ulrich Drepper <drepper@cygnus.com> * login/Makefile: New file. This directory contains functions for user administration. * Makefile (subdirs): Add login. * misc/Makefile (headers): Remove utmp.h. Now in login/utmp.h. (extra-libs, libutil-routines): Ditto. * misc/login.c, misc/login_tty.c, misc/logout.c, misc/logwtmp.c, misc/utmp.h: Moved to misc/. * login/login.c, login/login_tty.c, login/logout.c, login/logwtmp.c, login/utmp.h: Moved to here from misc/. * login/utmp.h: Split file. Definitions of data structures and constants are now in the system dependent utmpbits.h file. * login/setutent_r.c, login/setutent.c, login/endutent_r.c, login/endutent.c, login/getutent_r.c, login/getutent.c, login/getutid_r.c, login/getutid.c, login/getutline_r.c, login/getutline.c, login/pututline_r.c, login/pututline.c: New files. Routines to handle utmp-style files. * sysdeps/gnu/utmpbits.h: New file. Contains GNU/Linux specific definitions of utmp data structures and constants. * sysdeps/unix/sysv/utmpbits.h: Renamed from sysdeps/unix/sysv/utmp.h. * sysdeps/generic/utmpbits.h: New file. Generic (BSDish) version of definitions of utmp data structures and constants. Fri May 17 00:01:31 1996 Ulrich Drepper <drepper@cygnus.com> * locale/C-monetary.c: Default value for mon_decimal_point should be '.'. * stdio-common/printf.h: Remove Linux libc compatibility stuff. Add `extra' flag. Currently used in __printf_fp. * stdio-common/printf_fp.c (__guess_grouping): Renamed from `guess_grouping' and extend visibility to extern. This function is now used in `strfmon'. (__printf_fp): Recognize new bit flag in info struct. This triggers to use the grouping information and decimal point from the LC_MONETARY category instead of the LC_NUMERIC category. * stdio-common/vfprintf.c (process_arg): Correct major bug. In `complicated' loop we must not use the varargs because the args are already available in the ARGS_VALUE array. * stdlib/Makefile (headers): Add monetary.h. (routines): Add strfmon. * stdlib/monetary.h: New file. Header for strfmon function. * stdlib/strfmon.c: New file. Implement strfmon function to print monetary amounts according to current locale's rules. * sysdeps/unix/sysv/linux/i386/sys/vm86.h: The kernel header is now (>= Linux-1.3.100) called <asm/vm86.h>.
Diffstat (limited to 'login/pututline_r.c')
-rw-r--r--login/pututline_r.c89
1 files changed, 89 insertions, 0 deletions
diff --git a/login/pututline_r.c b/login/pututline_r.c
new file mode 100644
index 0000000..365a376
--- /dev/null
+++ b/login/pututline_r.c
@@ -0,0 +1,89 @@
+/* Copyright (C) 1996 Free Software Foundation, Inc.
+This file is part of the GNU C Library.
+Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996.
+
+The GNU C Library is free software; you can redistribute it and/or
+modify it under the terms of the GNU Library General Public License as
+published by the Free Software Foundation; either version 2 of the
+License, or (at your option) any later version.
+
+The GNU C Library is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+Library General Public License for more details.
+
+You should have received a copy of the GNU Library General Public
+License along with the GNU C Library; see the file COPYING.LIB. If
+not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+Boston, MA 02111-1307, USA. */
+
+#include <alloca.h>
+#include <errno.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <utmp.h>
+#include <sys/file.h>
+
+
+int
+pututline_r (const struct utmp *utmp_ptr, struct utmp_data *utmp_data)
+{
+ /* Open utmp file if not already done. */
+ if (utmp_data->ut_fd == -1)
+ {
+ setutent_r (utmp_data);
+ if (utmp_data->ut_fd == -1)
+ return -1;
+ }
+
+ /* Seek position to write. */
+ if (utmp_data->ubuf.ut_type != utmp_ptr->ut_type)
+ {
+ /* We must not overwrite the data in UTMP_DATA. */
+ struct utmp_data *data_tmp = alloca (sizeof (utmp_data));
+ struct utmp *dummy;
+
+ memcpy (data_tmp, utmp_data, sizeof (utmp_data));
+ utmp_data = data_tmp;
+
+ if (getutid_r (utmp_ptr, &dummy, utmp_data) < 0)
+ {
+ if (errno != ESRCH)
+ return -1;
+
+ utmp_data->loc_utmp = lseek (utmp_data->ut_fd, 0, SEEK_END);
+ if (utmp_data->loc_utmp == -1)
+ return -1;
+ }
+ }
+
+ /* Position file correctly. */
+ if (utmp_data->loc_utmp > 0
+ && lseek (utmp_data->ut_fd, utmp_data->loc_utmp - sizeof (struct utmp),
+ SEEK_SET) < 0)
+ return -1;
+
+ /* XXX An alternative solution would be to call an SUID root program
+ which write the new value. */
+
+ /* Try to lock the file. */
+ if (flock (utmp_data->ut_fd, LOCK_EX | LOCK_NB) < 0 && errno != ENOSYS)
+ {
+ /* Oh, oh. The file is already locked. Wait a bit and try again. */
+ sleep (1);
+
+ /* This time we ignore the error. */
+ (void) flock (utmp_data->ut_fd, LOCK_EX | LOCK_NB);
+ }
+
+ /* Write the new data. */
+ if (write (utmp_data->ut_fd, &utmp_data->ubuf, sizeof (struct utmp))
+ != sizeof (struct utmp))
+ return -1;
+
+ /* And unlock the file. */
+ (void) flock (utmp_data->ut_fd, LOCK_UN);
+
+ return 0;
+}