blob: 83aadd08a3031e2bd72d894f716ea911b50a63f4 [file] [log] [blame]
Erik Andersene49d5ec2000-02-08 19:58:47 +00001/* vi: set sw=4 ts=4: */
Eric Andersen87590061999-10-18 21:22:59 +00002/*
3 * Mini swapon/swapoff implementation for busybox
4 *
Eric Andersenc4996011999-10-20 22:08:37 +00005 *
Erik Andersen61677fe2000-04-13 01:18:56 +00006 * Copyright (C) 1999,2000 by Lineo, inc.
Eric Andersenc4996011999-10-20 22:08:37 +00007 * Written by Erik Andersen <andersen@lineo.com>, <andersee@debian.org>
Eric Andersen87590061999-10-18 21:22:59 +00008 *
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 "internal.h"
26#include <stdio.h>
27#include <sys/mount.h>
28#include <sys/swap.h>
29#include <mntent.h>
30#include <dirent.h>
31#include <fstab.h>
32#include <errno.h>
33
34
35static int whichApp;
Erik Andersene49d5ec2000-02-08 19:58:47 +000036static const char *appName;
Eric Andersen87590061999-10-18 21:22:59 +000037
Erik Andersene49d5ec2000-02-08 19:58:47 +000038static const char swapoff_usage[] =
Erik Andersen7ab9c7e2000-05-12 19:41:47 +000039 "swapoff [OPTION] [device]\n"
40#ifndef BB_FEATURE_TRIVIAL_HELP
41 "\nStop swapping virtual memory pages on the given device.\n\n"
Erik Andersene132f4b2000-02-09 04:16:43 +000042 "Options:\n"
Erik Andersen7ab9c7e2000-05-12 19:41:47 +000043 "\t-a\tStop swapping on all swap devices\n"
44#endif
45 ;
Erik Andersene49d5ec2000-02-08 19:58:47 +000046
Erik Andersene49d5ec2000-02-08 19:58:47 +000047static const char swapon_usage[] =
Erik Andersen7ab9c7e2000-05-12 19:41:47 +000048 "swapon [OPTION] [device]\n"
49#ifndef BB_FEATURE_TRIVIAL_HELP
50 "\nStart swapping virtual memory pages on the given device.\n\n"
Erik Andersene132f4b2000-02-09 04:16:43 +000051 "Options:\n"
Erik Andersen7ab9c7e2000-05-12 19:41:47 +000052 "\t-a\tStart swapping on all swap devices\n"
53#endif
54 ;
Eric Andersen87590061999-10-18 21:22:59 +000055
56
57#define SWAPON_APP 1
58#define SWAPOFF_APP 2
59
60
Erik Andersene49d5ec2000-02-08 19:58:47 +000061static void swap_enable_disable(char *device)
Eric Andersen87590061999-10-18 21:22:59 +000062{
Erik Andersene49d5ec2000-02-08 19:58:47 +000063 int status;
Eric Andersen87590061999-10-18 21:22:59 +000064
Erik Andersene49d5ec2000-02-08 19:58:47 +000065 if (whichApp == SWAPON_APP)
66 status = swapon(device, 0);
67 else
68 status = swapoff(device);
69
70 if (status != 0) {
71 perror(appName);
72 exit(FALSE);
73 }
Eric Andersen87590061999-10-18 21:22:59 +000074}
75
Erik Andersene49d5ec2000-02-08 19:58:47 +000076static void do_em_all()
Eric Andersen87590061999-10-18 21:22:59 +000077{
78 struct mntent *m;
Erik Andersene49d5ec2000-02-08 19:58:47 +000079 FILE *f = setmntent("/etc/fstab", "r");
Eric Andersen87590061999-10-18 21:22:59 +000080
81 if (f == NULL) {
Erik Andersene49d5ec2000-02-08 19:58:47 +000082 perror("/etc/fstab");
83 exit(FALSE);
Eric Andersen87590061999-10-18 21:22:59 +000084 }
Erik Andersene49d5ec2000-02-08 19:58:47 +000085 while ((m = getmntent(f)) != NULL) {
Eric Andersena42982e2000-06-07 17:28:53 +000086 if (strcmp(m->mnt_type, MNTTYPE_SWAP)==0) {
Erik Andersene49d5ec2000-02-08 19:58:47 +000087 swap_enable_disable(m->mnt_fsname);
88 }
Eric Andersen87590061999-10-18 21:22:59 +000089 }
Erik Andersene49d5ec2000-02-08 19:58:47 +000090 endmntent(f);
91 exit(TRUE);
Eric Andersen87590061999-10-18 21:22:59 +000092}
93
94
Erik Andersene49d5ec2000-02-08 19:58:47 +000095extern int swap_on_off_main(int argc, char **argv)
Eric Andersen87590061999-10-18 21:22:59 +000096{
Erik Andersene49d5ec2000-02-08 19:58:47 +000097 if (strcmp(*argv, "swapon") == 0) {
98 appName = *argv;
99 whichApp = SWAPON_APP;
Eric Andersen87590061999-10-18 21:22:59 +0000100
Erik Andersene49d5ec2000-02-08 19:58:47 +0000101 } else {
102 appName = *argv;
103 whichApp = SWAPOFF_APP;
Eric Andersen87590061999-10-18 21:22:59 +0000104 }
Eric Andersen87590061999-10-18 21:22:59 +0000105
Erik Andersene132f4b2000-02-09 04:16:43 +0000106 if (argc != 2) {
Erik Andersene49d5ec2000-02-08 19:58:47 +0000107 goto usage_and_exit;
Erik Andersene132f4b2000-02-09 04:16:43 +0000108 }
Erik Andersene49d5ec2000-02-08 19:58:47 +0000109 argc--;
110 argv++;
111
112 /* Parse any options */
113 while (**argv == '-') {
114 while (*++(*argv))
115 switch (**argv) {
116 case 'a':
Erik Andersen3364d782000-03-28 00:58:14 +0000117 {
118 struct stat statBuf;
119
120 if (stat("/etc/fstab", &statBuf) < 0)
121 fatalError("/etc/fstab file missing\n");
122 }
Erik Andersene49d5ec2000-02-08 19:58:47 +0000123 do_em_all();
124 break;
125 default:
126 goto usage_and_exit;
127 }
128 }
129 swap_enable_disable(*argv);
130 exit(TRUE);
131
132 usage_and_exit:
133 usage((whichApp == SWAPON_APP) ? swapon_usage : swapoff_usage);
134 exit(FALSE);
Eric Andersen87590061999-10-18 21:22:59 +0000135}