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64 lines
2.0 KiB
C
64 lines
2.0 KiB
C
/* utmpdump - dump utmp-like files.
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Copyright (C) 1997-2020 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Mark Kettenis <kettenis@phys.uva.nl>, 1997.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but 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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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <stdio.h>
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#include <stdlib.h>
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#include <time.h>
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#include <unistd.h>
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#include <utmp.h>
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static void
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print_entry (struct utmp *up)
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{
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/* Mixed 32-/64-bit systems may have timeval structs of different sixe
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but need struct utmp to be the same size. So in 64-bit up->ut_tv may
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not be a timeval but a struct of __int32_t's. This would cause a compile
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time warning and a formating error when 32-bit int is passed where
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a 64-bit long is expected. So copy up->up_tv to a temporary timeval.
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This is 32-/64-bit agnostic and expands the timeval fields to the
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expected size as needed. */
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struct timeval temp_tv;
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temp_tv.tv_sec = up->ut_tv.tv_sec;
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temp_tv.tv_usec = up->ut_tv.tv_usec;
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printf ("[%d] [%05d] [%-4.4s] [%-8.8s] [%-12.12s] [%-16.16s] [%-15.15s]"
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" [%ld]\n",
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up->ut_type, up->ut_pid, up->ut_id, up->ut_user, up->ut_line,
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up->ut_host, 4 + ctime (&temp_tv.tv_sec),
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(long int) temp_tv.tv_usec);
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}
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int
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main (int argc, char *argv[])
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{
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struct utmp *up;
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if (argc > 1)
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utmpname (argv[1]);
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setutent ();
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while ((up = getutent ()))
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print_entry (up);
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endutent ();
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return EXIT_SUCCESS;
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}
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