1/* vi: set sw=4 ts=4: */
2/*
3 * Mini swapon/swapoff implementation for busybox
4 *
5 *
6 * Copyright (C) 1999,2000,2001 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 <stdio.h>
26#include <mntent.h>
27#include <dirent.h>
28#include <errno.h>
29#include <string.h>
30#include <stdlib.h>
31#include <sys/mount.h>
32
33#if __GNU_LIBRARY__ < 5
34/* libc5 doesn't have sys/swap.h, define these here. */
35extern int swapon (__const char *__path, int __flags);
36extern int swapoff (__const char *__path);
37#else
38#include <sys/swap.h>
39#endif
40
41#include "busybox.h"
42
43static int whichApp;
44
45static const int SWAPON_APP = 1;
46static const int SWAPOFF_APP = 2;
47
48
49static void swap_enable_disable(char *device)
50{
51	int status;
52
53	if (whichApp == SWAPON_APP)
54		status = swapon(device, 0);
55	else
56		status = swapoff(device);
57
58	if (status != 0)
59		perror_msg_and_die(applet_name);
60}
61
62static void do_em_all()
63{
64	struct mntent *m;
65	FILE *f = setmntent("/etc/fstab", "r");
66
67	if (f == NULL)
68		perror_msg_and_die("/etc/fstab");
69	while ((m = getmntent(f)) != NULL) {
70		if (strcmp(m->mnt_type, MNTTYPE_SWAP)==0) {
71			swap_enable_disable(m->mnt_fsname);
72		}
73	}
74	endmntent(f);
75	exit(EXIT_SUCCESS);
76}
77
78
79extern int swap_on_off_main(int argc, char **argv)
80{
81	if (strcmp(applet_name, "swapon") == 0) {
82		whichApp = SWAPON_APP;
83	} else {
84		whichApp = SWAPOFF_APP;
85	}
86
87	if (argc != 2) {
88		goto usage_and_exit;
89	}
90	argc--;
91	argv++;
92
93	/* Parse any options */
94	while (**argv == '-') {
95		while (*++(*argv))
96			switch (**argv) {
97			case 'a':
98				{
99					struct stat statBuf;
100
101					if (stat("/etc/fstab", &statBuf) < 0)
102						error_msg_and_die("/etc/fstab file missing");
103				}
104				do_em_all();
105				break;
106			default:
107				goto usage_and_exit;
108			}
109	}
110	swap_enable_disable(*argv);
111	return EXIT_SUCCESS;
112
113  usage_and_exit:
114	show_usage();
115}
116