135 lines
3.0 KiB
C
Executable File
135 lines
3.0 KiB
C
Executable File
/* A version of bsd `logwtmp' that should be widely portable
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Copyright (C) 1996, 2000 Free Software Foundation, Inc.
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Written by Miles Bader <miles@gnu.ai.mit.edu>
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation; either version 2, or (at
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your option) any later version.
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This program is distributed in the hope that it will be useful, but
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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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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
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/* If `KEEP_OPEN' is defined, then a special version of logwtmp is compiled,
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called logwtmp_keep_open, which keeps the wtmp file descriptor open
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between calls, and doesn't attempt to open the file after the first call. */
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#include <unistd.h>
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#include <sys/types.h>
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#ifdef TIME_WITH_SYS_TIME
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# include <sys/time.h>
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# include <time.h>
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#else
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# ifdef HAVE_SYS_TIME_H
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# include <sys/time.h>
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# else
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# include <time.h>
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# endif
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#endif
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#include <fcntl.h>
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#include <sys/stat.h>
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#include <sys/file.h>
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#ifdef HAVE_ERRNO_H
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#include <errno.h>
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#endif
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#ifdef HAVE_UTMP_H
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#include <utmp.h>
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#else
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#ifdef HAVE_UTMPX_H
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#include <utmpx.h>
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#define utmp utmpx /* make utmpx look more like utmp */
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#endif
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#endif
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#ifdef HAVE_STRING_H
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#include <string.h>
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#endif
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#if !HAVE_DECL_ERRNO
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extern int errno;
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#endif
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static void
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_logwtmp (struct utmp *ut)
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{
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#ifdef KEEP_OPEN
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static int fd = -1;
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if (fd < 0)
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fd = open (PATH_WTMP, O_WRONLY|O_APPEND, 0);
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#else
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int fd = open (PATH_WTMP, O_WRONLY|O_APPEND, 0);
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#endif
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if (fd >= 0)
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{
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struct stat st;
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#ifdef HAVE_FLOCK
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if (flock (fd, LOCK_EX|LOCK_NB) < 0 && errno != ENOSYS)
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{
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sleep (1);
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flock (fd, LOCK_EX|LOCK_NB); /* ignore error */
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}
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#endif
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#ifdef HAVE_FTRUNCATE
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if (fstat (fd, &st) == 0
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&& write (fd, (char *)ut, sizeof *ut) != sizeof *ut)
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ftruncate (fd, st.st_size);
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#else
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write (fd, (char *)ut, sizeof *ut);
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#endif
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#ifdef HAVE_FLOCK
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flock (fd, LOCK_UN);
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#endif
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#ifndef KEEP_OPEN
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close (fd);
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#endif
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}
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}
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void
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#ifdef KEEP_OPEN
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logwtmp_keep_open (char *line, char *name, char *host)
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#else
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logwtmp (char *line, char *name, char *host)
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#endif
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{
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struct utmp ut;
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/* Set information in new entry. */
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bzero (&ut, sizeof (ut));
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#ifdef HAVE_STRUCT_UTMP_UT_TYPE
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ut.ut_type = USER_PROCESS;
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#endif
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strncpy (ut.ut_line, line, sizeof ut.ut_line);
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#ifdef HAVE_STRUCT_UTMP_UT_NAME
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strncpy (ut.ut_name, name, sizeof ut.ut_name);
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#endif
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#ifdef HAVE_STRUCT_UTMP_UT_HOST
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strncpy (ut.ut_host, host, sizeof ut.ut_host);
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#endif
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#ifdef HAVE_STRUCT_UTMP_UT_TV
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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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_logwtmp (&ut);
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}
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