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logwtmp.c
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C/C++ Source or Header
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1996-09-28
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123 lines
/* A version of bsd `logwtmp' that should be widely portable
Copyright (C) 1996 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 2, 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>
#include <sys/time.h>
#include <sys/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
#ifndef HAVE_ERRNO_DECL
extern int errno;
#endif
static void
_logwtmp (ut)
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 (line, name, host)
#else
logwtmp (line, name, host)
#endif
char *line, *name, *host;
{
struct utmp ut;
/* Set information in new entry. */
bzero (&ut, sizeof (ut));
#ifdef HAVE_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_UTMP_UT_HOST
strncpy (ut.ut_host, host, sizeof ut.ut_host);
#endif
#ifdef HAVE_UTMP_UT_TV
gettimeofday (&ut.ut_tv, NULL);
#else
time (&ut.ut_time);
#endif
_logwtmp (&ut);
}