summaryrefslogtreecommitdiff
path: root/lib/utmp.c
blob: 8511cd260a315af9fd1bca6d019c90fc5653ba95 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
/* utmp.c -- Replacements for {set,get,end}utmp functions

Copyright (C) 2002 Free Software Foundation, Inc.

This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.

This program is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */

#include <sys/types.h> 
#include <sys/time.h>
#include <utmp.h>
#include <fcntl.h>
#include <unistd.h>
#include <string.h>
#include <stdio.h>

static char *utmp_name = _PATH_UTMP;
static int fd = -1;
static struct utmp ut;

void
endutent ()
{
  if (fd > 0)
    close (fd);
  fd = -1;
}

void
setutent ()
{
  endutent ();
  if ((fd = open (utmp_name, O_RDWR)) < 0
      && ((fd = open (utmp_name, O_RDONLY)) < 0))
    perror ("setutent: Can't open utmp file");
}

struct utmp *
getutent ()
{
  if (fd < 0)
    setutent ();

  if (fd < 0 || read (fd, &ut, sizeof ut) != sizeof ut)
    return NULL;

  return &ut;
}

Return to:

Send suggestions and report system problems to the System administrator.