86 lines
2.4 KiB
C
86 lines
2.4 KiB
C
/* 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 <errno.h>
|
|
#include <string.h>
|
|
#include <unistd.h>
|
|
#include <utmp.h>
|
|
#include <sys/file.h>
|
|
#include <sys/stat.h>
|
|
|
|
void
|
|
logwtmp (const char *line, const char *name, const char *host)
|
|
{
|
|
struct utmp ut;
|
|
struct stat st;
|
|
size_t written;
|
|
int fd;
|
|
|
|
/* Open WTMP file. */
|
|
fd = __open (_PATH_WTMP, O_WRONLY | O_APPEND);
|
|
if (fd < 0)
|
|
return;
|
|
|
|
/* Set information in new entry. */
|
|
memset (&ut, 0, sizeof (ut));
|
|
ut.ut_pid = getpid ();
|
|
#if _HAVE_UT_TYPE - 0
|
|
ut.ut_type = name[0] ? USER_PROCESS : DEAD_PROCESS;
|
|
#endif
|
|
strncpy (ut.ut_line, line, sizeof ut.ut_line);
|
|
strncpy (ut.ut_name, name, sizeof ut.ut_name);
|
|
#if _HAVE_UT_HOST - 0
|
|
strncpy (ut.ut_host, host, sizeof ut.ut_host);
|
|
#endif
|
|
|
|
#if _HAVE_UT_TV - 0
|
|
__gettimeofday (&ut.ut_tv, NULL);
|
|
#else
|
|
__time (&ut.ut_time);
|
|
#endif
|
|
|
|
/* Try to lock the file. */
|
|
if (__flock (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. */
|
|
__flock (fd, LOCK_EX | LOCK_NB);
|
|
}
|
|
|
|
/* Remeber original size of log file: */
|
|
if (__fstat (fd, &st) < 0)
|
|
goto done;
|
|
|
|
/* Write the entry. If we can't write all the bytes, reset the file
|
|
size back to the original size. That way, no partial entries
|
|
will remain. */
|
|
written = __write (fd, &ut, sizeof (ut));
|
|
if (written > 0 && written != sizeof (ut))
|
|
ftruncate (fd, st.st_size);
|
|
|
|
done:
|
|
/* And unlock the file. */
|
|
__flock (fd, LOCK_UN);
|
|
|
|
/* Close WTMP file. */
|
|
__close (fd);
|
|
}
|