1 /*
2 * Copyright (C) 2008 The Android Open Source Project
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * * Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * * Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in
12 * the documentation and/or other materials provided with the
13 * distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
16 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
17 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
18 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
19 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
22 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
25 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28 #include <string.h>
29 #include <stdio.h>
30 #include <utmp.h>
31
32
pututline(struct utmp * utmp)33 void pututline(struct utmp* utmp)
34 {
35 FILE* f;
36 struct utmp u;
37 long i;
38
39 if (!(f = fopen(_PATH_UTMP, "w+")))
40 return;
41
42 while (fread(&u, sizeof(struct utmp), 1, f) == 1)
43 {
44 if (!strncmp(utmp->ut_line, u.ut_line, sizeof(u.ut_line) -1))
45 {
46 if ((i = ftell(f)) < 0)
47 goto ret;
48 if (fseek(f, i - sizeof(struct utmp), SEEK_SET) < 0)
49 goto ret;
50 fwrite(utmp, sizeof(struct utmp), 1, f);
51 goto ret;
52 }
53 }
54
55
56 fclose(f);
57
58 if (!(f = fopen(_PATH_UTMP, "w+")))
59 return;
60 fwrite(utmp, sizeof(struct utmp), 1, f);
61
62 ret:
63 fclose(f);
64 }
65