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/* A version of bsd `logwtmp' that should be widely portable
Copyright (C) 1996, 2000, 2007 Free Software Foundation, Inc.
Written by Miles Bader <miles@gnu.ai.mit.edu>
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 3, or (at
your option) any later version.
This program 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
General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
/* If `KEEP_OPEN' is defined, then a special version of logwtmp is compiled,
called logwtmp_keep_open, which keeps the wtmp file descriptor open
between calls, and doesn't attempt to open the file after the first call. */
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <unistd.h>
#include <sys/types.h>
#ifdef TIME_WITH_SYS_TIME
# include <sys/time.h>
# include <time.h>
#else
# ifdef HAVE_SYS_TIME_H
# include <sys/time.h>
# else
# include <time.h>
# endif
#endif
#include <fcntl.h>
#include <sys/stat.h>
#include <sys/file.h>
#ifdef HAVE_ERRNO_H
# include <errno.h>
#endif
#ifdef HAVE_UTMP_H
# include <utmp.h>
#else
# ifdef HAVE_UTMPX_H
# include <utmpx.h>
# define utmp utmpx /* make utmpx look more like utmp */
# endif
#endif
#ifdef HAVE_STRING_H
# include <string.h>
#endif
#if !HAVE_DECL_ERRNO
extern int errno;
#endif
static void
_logwtmp (struct utmp *ut)
{
#ifdef KEEP_OPEN
static int fd = -1;
if (fd < 0)
fd = open (PATH_WTMP, O_WRONLY | O_APPEND, 0);
#else
int fd = open (PATH_WTMP, O_WRONLY | O_APPEND, 0);
#endif
if (fd >= 0)
{
struct stat st;
#ifdef HAVE_FLOCK
if (flock (fd, LOCK_EX | LOCK_NB) < 0 && errno != ENOSYS)
{
sleep (1);
flock (fd, LOCK_EX | LOCK_NB); /* ignore error */
}
#endif
#ifdef HAVE_FTRUNCATE
if (fstat (fd, &st) == 0
&& write (fd, (char *) ut, sizeof *ut) != sizeof *ut)
ftruncate (fd, st.st_size);
#else
write (fd, (char *) ut, sizeof *ut);
#endif
#ifdef HAVE_FLOCK
flock (fd, LOCK_UN);
#endif
#ifndef KEEP_OPEN
close (fd);
#endif
}
}
void
#ifdef KEEP_OPEN
logwtmp_keep_open (char *line, char *name, char *host)
#else
logwtmp (char *line, char *name, char *host)
#endif
{
struct utmp ut;
/* Set information in new entry. */
bzero (&ut, sizeof (ut));
#ifdef HAVE_STRUCT_UTMP_UT_TYPE
ut.ut_type = USER_PROCESS;
#endif
strncpy (ut.ut_line, line, sizeof ut.ut_line);
strncpy (ut.ut_name, name, sizeof ut.ut_name);
#ifdef HAVE_STRUCT_UTMP_UT_HOST
strncpy (ut.ut_host, host, sizeof ut.ut_host);
#endif
#ifdef HAVE_STRUCT_UTMP_UT_TV
gettimeofday (&ut.ut_tv, NULL);
#else
time (&ut.ut_time);
#endif
_logwtmp (&ut);
}
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