libutil/logwtmp.c

   1 /* vi: set sw=4 ts=4: */
   2 /*
   3  * wtmp support rubbish (i.e. complete crap)
   4  * Copyright (C) 2000-2006 by Erik Andersen <andersen@uclibc.org>
   5  * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
   6  */
   7
   8 #include <string.h>
   9 #include <sys/time.h>
  10 #include <time.h>
  11 #include <unistd.h>
  12 #include <utmp.h>
  13 #include <fcntl.h>
  14 #include <sys/file.h>
  15
  16 void logwtmp(const char *line, const char *name, const char *host)
  17 {
  18     struct utmp lutmp;
  19     memset(&lutmp, 0, sizeof(lutmp));
  20
  21     lutmp.ut_type = (name && *name) ? USER_PROCESS : DEAD_PROCESS;
  22     lutmp.ut_pid = getpid();
  23     strncpy(lutmp.ut_line, line, sizeof(lutmp.ut_line)-1);
  24     strncpy(lutmp.ut_name, name, sizeof(lutmp.ut_name)-1);
  25     strncpy(lutmp.ut_host, host, sizeof(lutmp.ut_host)-1);
  26 #if !defined __WORDSIZE_COMPAT32 || __WORDSIZE_COMPAT32 == 0
  27     gettimeofday(&lutmp.ut_tv, NULL);
  28 #else
  29     {
  30       struct timeval tv;
  31       gettimeofday(&tv, NULL);
  32       lutmp.ut_tv.tv_sec = tv.tv_sec;
  33       lutmp.ut_tv.tv_usec = tv.tv_usec;
  34     }
  35 #endif
  36
  37     updwtmp(_PATH_WTMP, &lutmp);
  38 }
  39
  40 #if 0
  41 /* This is enabled in uClibc/libc/misc/utmp/wtent.c */
  42 void updwtmp(const char *wtmp_file, const struct utmp *lutmp)
  43 {
  44     int fd;
  45
  46     fd = open(wtmp_file, O_APPEND | O_WRONLY);
  47     if (fd >= 0) {
  48         if (lockf(fd, F_LOCK, 0) == 0) {
  49             write(fd, lutmp, sizeof(*lutmp));
  50             lockf(fd, F_ULOCK, 0);
  51             close(fd);
  52         }
  53     }
  54 }
  55 #endif