1/* utmpdump - dump utmp-like files.
2 Copyright (C) 1997-2021 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, see
18 <https://www.gnu.org/licenses/>. */
19
20#include <stdio.h>
21#include <stdlib.h>
22#include <time.h>
23#include <unistd.h>
24#include <utmp.h>
25
26static void
27print_entry (struct utmp *up)
28{
29 /* Mixed 32-/64-bit systems may have timeval structs of different sixe
30 but need struct utmp to be the same size. So in 64-bit up->ut_tv may
31 not be a timeval but a struct of __int32_t's. This would cause a compile
32 time warning and a formating error when 32-bit int is passed where
33 a 64-bit long is expected. So copy up->up_tv to a temporary timeval.
34 This is 32-/64-bit agnostic and expands the timeval fields to the
35 expected size as needed. */
36 struct timeval temp_tv;
37 temp_tv.tv_sec = up->ut_tv.tv_sec;
38 temp_tv.tv_usec = up->ut_tv.tv_usec;
39
40 printf ("[%d] [%05d] [%-4.4s] [%-8.8s] [%-12.12s] [%-16.16s] [%-15.15s]"
41 " [%ld]\n",
42 up->ut_type, up->ut_pid, up->ut_id, up->ut_user, up->ut_line,
43 up->ut_host, 4 + ctime (&temp_tv.tv_sec),
44 (long int) temp_tv.tv_usec);
45}
46
47int
48main (int argc, char *argv[])
49{
50 struct utmp *up;
51
52 if (argc > 1)
53 utmpname (argv[1]);
54
55 setutent ();
56
57 while ((up = getutent ()))
58 print_entry (up);
59
60 endutent ();
61
62 return EXIT_SUCCESS;
63}
64