Use static instead of extern, braces around if's, run through indent
[oweals/busybox.git] / util-linux / swaponoff.c
1 /* vi: set sw=4 ts=4: */
2 /*
3  * Mini swapon/swapoff implementation for busybox
4  *
5  * Copyright (C) 1999,2000 by Lineo, inc. and Erik Andersen
6  * Copyright (C) 1999,2000,2001 by Erik Andersen <andersee@debian.org>
7  *
8  * This program is free software; you can redistribute it and/or modify
9  * it under the terms of the GNU General Public License as published by
10  * the Free Software Foundation; either version 2 of the License, or
11  * (at your option) any later version.
12  *
13  * This program is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16  * General Public License for more details.
17  *
18  * You should have received a copy of the GNU General Public License
19  * along with this program; if not, write to the Free Software
20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21  *
22  */
23
24 #include <stdio.h>
25 #include <mntent.h>
26 #include <dirent.h>
27 #include <errno.h>
28 #include <string.h>
29 #include <stdlib.h>
30 #include <sys/mount.h>
31
32 #if __GNU_LIBRARY__ < 5
33 /* libc5 doesn't have sys/swap.h, define these here. */ 
34 extern int swapon (__const char *__path, int __flags);
35 extern int swapoff (__const char *__path);
36 #else
37 #include <sys/swap.h>
38 #endif
39
40 #include "busybox.h"
41
42 static int whichApp;
43
44 static const int SWAPON_APP = 1;
45 static const int SWAPOFF_APP = 2;
46
47
48 static void swap_enable_disable(char *device)
49 {
50         int status;
51
52         if (whichApp == SWAPON_APP)
53                 status = swapon(device, 0);
54         else
55                 status = swapoff(device);
56
57         if (status != 0)
58                 perror_msg_and_die(applet_name);
59 }
60
61 static void do_em_all(void)
62 {
63         struct mntent *m;
64         FILE *f = setmntent("/etc/fstab", "r");
65
66         if (f == NULL)
67                 perror_msg_and_die("/etc/fstab");
68         while ((m = getmntent(f)) != NULL) {
69                 if (strcmp(m->mnt_type, MNTTYPE_SWAP)==0) {
70                         swap_enable_disable(m->mnt_fsname);
71                 }
72         }
73         endmntent(f);
74         exit(EXIT_SUCCESS);
75 }
76
77
78 extern int swap_on_off_main(int argc, char **argv)
79 {
80         if (strcmp(applet_name, "swapon") == 0) {
81                 whichApp = SWAPON_APP;
82         } else {
83                 whichApp = SWAPOFF_APP;
84         }
85
86         if (argc != 2) {
87                 goto usage_and_exit;
88         }
89         argc--;
90         argv++;
91
92         /* Parse any options */
93         while (**argv == '-') {
94                 while (*++(*argv))
95                         switch (**argv) {
96                         case 'a':
97                                 {
98                                         struct stat statBuf;
99
100                                         if (stat("/etc/fstab", &statBuf) < 0)
101                                                 error_msg_and_die("/etc/fstab file missing");
102                                 }
103                                 do_em_all();
104                                 break;
105                         default:
106                                 goto usage_and_exit;
107                         }
108         }
109         swap_enable_disable(*argv);
110         return EXIT_SUCCESS;
111
112   usage_and_exit:
113         show_usage();
114 }