summaryrefslogtreecommitdiffhomepage
path: root/util-linux/swaponoff.c
blob: 0f8c4f5f349b010aefb2722083d2f8f30deb1d11 (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
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
/* vi: set sw=4 ts=4: */
/*
 * Mini swapon/swapoff implementation for busybox
 *
 *
 * Copyright (C) 1999,2000 by Lineo, inc.
 * Written by Erik Andersen <andersen@lineo.com>, <andersee@debian.org>
 *
 * 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 "internal.h"
#include <stdio.h>
#include <sys/mount.h>
#include <sys/swap.h>
#include <mntent.h>
#include <dirent.h>
#include <fstab.h>
#include <errno.h>


static int whichApp;
static const char *appName;

static const char swapoff_usage[] =
	"swapoff [OPTION] [device]\n"
#ifndef BB_FEATURE_TRIVIAL_HELP
	"\nStop swapping virtual memory pages on the given device.\n\n"
	"Options:\n"
	"\t-a\tStop swapping on all swap devices\n"
#endif
	;

static const char swapon_usage[] =
	"swapon [OPTION] [device]\n"
#ifndef BB_FEATURE_TRIVIAL_HELP
	"\nStart swapping virtual memory pages on the given device.\n\n"
	"Options:\n"
	"\t-a\tStart swapping on all swap devices\n"
#endif
	;


#define SWAPON_APP   1
#define SWAPOFF_APP  2


static void swap_enable_disable(char *device)
{
	int status;

	if (whichApp == SWAPON_APP)
		status = swapon(device, 0);
	else
		status = swapoff(device);

	if (status != 0) {
		perror(appName);
		exit(FALSE);
	}
}

static void do_em_all()
{
	struct mntent *m;
	FILE *f = setmntent("/etc/fstab", "r");

	if (f == NULL) {
		perror("/etc/fstab");
		exit(FALSE);
	}
	while ((m = getmntent(f)) != NULL) {
		if (!strstr(m->mnt_type, MNTTYPE_SWAP)) {
			swap_enable_disable(m->mnt_fsname);
		}
	}
	endmntent(f);
	exit(TRUE);
}


extern int swap_on_off_main(int argc, char **argv)
{
	if (strcmp(*argv, "swapon") == 0) {
		appName = *argv;
		whichApp = SWAPON_APP;

	} else {
		appName = *argv;
		whichApp = SWAPOFF_APP;
	}

	if (argc != 2) {
		goto usage_and_exit;
	}
	argc--;
	argv++;

	/* Parse any options */
	while (**argv == '-') {
		while (*++(*argv))
			switch (**argv) {
			case 'a':
				{
					struct stat statBuf;

					if (stat("/etc/fstab", &statBuf) < 0)
						fatalError("/etc/fstab file missing\n");
				}
				do_em_all();
				break;
			default:
				goto usage_and_exit;
			}
	}
	swap_enable_disable(*argv);
	exit(TRUE);

  usage_and_exit:
	usage((whichApp == SWAPON_APP) ? swapon_usage : swapoff_usage);
	exit(FALSE);
}