Renamed "internal.h" to the more sensible "busybox.h".
[oweals/busybox.git] / util-linux / swaponoff.c
1 /* vi: set sw=4 ts=4: */
2 /*
3  * Mini swapon/swapoff implementation for busybox
4  *
5  *
6  * Copyright (C) 1999,2000 by Lineo, inc.
7  * Written by Erik Andersen <andersen@lineo.com>, <andersee@debian.org>
8  *
9  * This program is free software; you can redistribute it and/or modify
10  * it under the terms of the GNU General Public License as published by
11  * the Free Software Foundation; either version 2 of the License, or
12  * (at your option) any later version.
13  *
14  * This program is distributed in the hope that it will be useful,
15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17  * General Public License for more details.
18  *
19  * You should have received a copy of the GNU General Public License
20  * along with this program; if not, write to the Free Software
21  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22  *
23  */
24
25 #include "busybox.h"
26 #include <stdio.h>
27 #include <sys/mount.h>
28 #include <mntent.h>
29 #include <dirent.h>
30 #include <errno.h>
31
32 _syscall2(int, swapon, const char *, path, int, flags);
33 _syscall1(int, swapoff, const char *, path);
34
35
36 static int whichApp;
37
38 #define SWAPON_APP   1
39 #define SWAPOFF_APP  2
40
41
42 static void swap_enable_disable(char *device)
43 {
44         int status;
45
46         if (whichApp == SWAPON_APP)
47                 status = swapon(device, 0);
48         else
49                 status = swapoff(device);
50
51         if (status != 0) {
52                 perror(applet_name);
53                 exit(FALSE);
54         }
55 }
56
57 static void do_em_all()
58 {
59         struct mntent *m;
60         FILE *f = setmntent("/etc/fstab", "r");
61
62         if (f == NULL) {
63                 perror("/etc/fstab");
64                 exit(FALSE);
65         }
66         while ((m = getmntent(f)) != NULL) {
67                 if (strcmp(m->mnt_type, MNTTYPE_SWAP)==0) {
68                         swap_enable_disable(m->mnt_fsname);
69                 }
70         }
71         endmntent(f);
72         exit(TRUE);
73 }
74
75
76 extern int swap_on_off_main(int argc, char **argv)
77 {
78         if (strcmp(applet_name, "swapon") == 0) {
79                 whichApp = SWAPON_APP;
80         } else {
81                 whichApp = SWAPOFF_APP;
82         }
83
84         if (argc != 2) {
85                 goto usage_and_exit;
86         }
87         argc--;
88         argv++;
89
90         /* Parse any options */
91         while (**argv == '-') {
92                 while (*++(*argv))
93                         switch (**argv) {
94                         case 'a':
95                                 {
96                                         struct stat statBuf;
97
98                                         if (stat("/etc/fstab", &statBuf) < 0)
99                                                 fatalError("/etc/fstab file missing\n");
100                                 }
101                                 do_em_all();
102                                 break;
103                         default:
104                                 goto usage_and_exit;
105                         }
106         }
107         swap_enable_disable(*argv);
108         exit(TRUE);
109
110   usage_and_exit:
111         usage((whichApp == SWAPON_APP) ? swapon_usage : swapoff_usage);
112         exit(FALSE);
113 }