88 lines
2.5 KiB
C
88 lines
2.5 KiB
C
/* Copyright (C) 1996 Free Software Foundation, Inc.
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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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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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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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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include <errno.h>
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#include <string.h>
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#include <unistd.h>
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#include <utmp.h>
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#include <sys/file.h>
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#include <sys/stat.h>
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void
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logwtmp (const char *line, const char *name, const char *host)
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{
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struct utmp ut;
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struct stat st;
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size_t written;
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int fd;
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/* Open WTMP file. */
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fd = __open (_PATH_WTMP, O_WRONLY | O_APPEND);
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if (fd < 0)
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return;
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/* Set information in new entry. */
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memset (&ut, 0, sizeof (ut));
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#if _HAVE_UT_PID - 0
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ut.ut_pid = getpid ();
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#endif
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#if _HAVE_UT_TYPE - 0
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ut.ut_type = name[0] ? USER_PROCESS : DEAD_PROCESS;
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#endif
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strncpy (ut.ut_line, line, sizeof ut.ut_line);
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strncpy (ut.ut_name, name, sizeof ut.ut_name);
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#if _HAVE_UT_HOST - 0
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strncpy (ut.ut_host, host, sizeof ut.ut_host);
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#endif
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#if _HAVE_UT_TV - 0
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__gettimeofday (&ut.ut_tv, NULL);
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#else
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time (&ut.ut_time);
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#endif
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/* Try to lock the file. */
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if (__flock (fd, LOCK_EX | LOCK_NB) < 0 && errno != ENOSYS)
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{
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/* Oh, oh. The file is already locked. Wait a bit and try again. */
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sleep (1);
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/* This time we ignore the error. */
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__flock (fd, LOCK_EX | LOCK_NB);
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}
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/* Remeber original size of log file: */
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if (__fstat (fd, &st) < 0)
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goto done;
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/* Write the entry. If we can't write all the bytes, reset the file
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size back to the original size. That way, no partial entries
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will remain. */
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written = __write (fd, &ut, sizeof (ut));
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if (written > 0 && written != sizeof (ut))
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ftruncate (fd, st.st_size);
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done:
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/* And unlock the file. */
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__flock (fd, LOCK_UN);
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/* Close WTMP file. */
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__close (fd);
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}
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