login/programs/utmpdump.c

   1 /* utmpdump - dump utmp-like files.
   2    Copyright (C) 1997, 2002, 2003 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4    Contributed by Mark Kettenis <kettenis@phys.uva.nl>, 1997.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Lesser General Public
   8    License as published by the Free Software Foundation; either
   9    version 2.1 of the License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library; if not, write to the Free
  18    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  19    02111-1307 USA.  */
  20
  21 #include <stdio.h>
  22 #include <stdlib.h>
  23 #include <time.h>
  24 #include <unistd.h>
  25 #include <utmp.h>
  26
  27 static void
  28 print_entry (struct utmp *up)
  29 {
  30   /* Mixed 32-/64-bit systems may have timeval structs of different sixe
  31      but need struct utmp to be the same size.  So in 64-bit up->ut_tv may
  32      not be a timeval but a struct of __int32_t's.  This would cause a compile
  33      time warning and a formating error when 32-bit int is passed where
  34      a 64-bit long is expected. So copy up->up_tv to a temporary timeval.
  35      This is 32-/64-bit agnostic and expands the timeval fields to the
  36      expected size as needed. */
  37   struct timeval temp_tv;
  38   temp_tv.tv_sec = up->ut_tv.tv_sec;
  39   temp_tv.tv_usec = up->ut_tv.tv_usec;
  40
  41   (printf) (
  42             /* The format string.  */
  43 #if _HAVE_UT_TYPE
  44             "[%d] "
  45 #endif
  46 #if _HAVE_UT_PID
  47             "[%05d] "
  48 #endif
  49 #if _HAVE_UT_ID
  50             "[%-4.4s] "
  51 #endif
  52             "[%-8.8s] [%-12.12s]"
  53 #if _HAVE_UT_HOST
  54             " [%-16.16s]"
  55 #endif
  56             " [%-15.15s]"
  57 #if _HAVE_UT_TV
  58             " [%ld]"
  59 #endif
  60             "\n"
  61             /* The arguments.  */
  62 #if _HAVE_UT_TYPE
  63             , up->ut_type
  64 #endif
  65 #if _HAVE_UT_PID
  66             , up->ut_pid
  67 #endif
  68 #if _HAVE_UT_ID
  69             , up->ut_id
  70 #endif
  71             , up->ut_user, up->ut_line
  72 #if _HAVE_UT_HOST
  73             , up->ut_host
  74 #endif
  75 #if _HAVE_UT_TV
  76             , 4 + ctime (&temp_tv.tv_sec)
  77             , (long int) temp_tv.tv_usec
  78 #else
  79             , 4 + ctime (&up->ut_time)
  80 #endif
  81            );
  82 }
  83
  84 int
  85 main (int argc, char *argv[])
  86 {
  87   struct utmp *up;
  88
  89   if (argc > 1)
  90     utmpname (argv[1]);
  91
  92   setutent ();
  93
  94   while ((up = getutent ()))
  95     print_entry (up);
  96
  97   endutent ();
  98
  99   return EXIT_SUCCESS;
 100 }