mirror of
https://github.com/sheumann/hush.git
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138 lines
2.9 KiB
C
138 lines
2.9 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* Mini swapon/swapoff implementation for busybox
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*
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*
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* Copyright (C) 1999,2000 by Lineo, inc.
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* Written by Erik Andersen <andersen@lineo.com>, <andersee@debian.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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#include "internal.h"
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#include <stdio.h>
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#include <sys/mount.h>
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#include <mntent.h>
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#include <dirent.h>
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#include <errno.h>
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#include <linux/unistd.h>
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_syscall2(int, swapon, const char *, path, int, flags);
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_syscall1(int, swapoff, const char *, path);
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static int whichApp;
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static const char *appName;
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static const char swapoff_usage[] =
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"swapoff [OPTION] [device]\n"
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#ifndef BB_FEATURE_TRIVIAL_HELP
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"\nStop swapping virtual memory pages on the given device.\n\n"
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"Options:\n"
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"\t-a\tStop swapping on all swap devices\n"
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#endif
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;
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static const char swapon_usage[] =
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"swapon [OPTION] [device]\n"
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#ifndef BB_FEATURE_TRIVIAL_HELP
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"\nStart swapping virtual memory pages on the given device.\n\n"
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"Options:\n"
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"\t-a\tStart swapping on all swap devices\n"
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#endif
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;
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#define SWAPON_APP 1
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#define SWAPOFF_APP 2
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static void swap_enable_disable(char *device)
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{
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int status;
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if (whichApp == SWAPON_APP)
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status = swapon(device, 0);
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else
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status = swapoff(device);
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if (status != 0) {
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perror(appName);
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exit(FALSE);
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}
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}
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static void do_em_all()
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{
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struct mntent *m;
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FILE *f = setmntent("/etc/fstab", "r");
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if (f == NULL) {
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perror("/etc/fstab");
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exit(FALSE);
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}
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while ((m = getmntent(f)) != NULL) {
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if (strcmp(m->mnt_type, MNTTYPE_SWAP)==0) {
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swap_enable_disable(m->mnt_fsname);
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}
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}
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endmntent(f);
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exit(TRUE);
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}
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extern int swap_on_off_main(int argc, char **argv)
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{
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if (strcmp(*argv, "swapon") == 0) {
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appName = *argv;
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whichApp = SWAPON_APP;
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} else {
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appName = *argv;
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whichApp = SWAPOFF_APP;
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}
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if (argc != 2) {
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goto usage_and_exit;
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}
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argc--;
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argv++;
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/* Parse any options */
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while (**argv == '-') {
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while (*++(*argv))
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switch (**argv) {
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case 'a':
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{
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struct stat statBuf;
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if (stat("/etc/fstab", &statBuf) < 0)
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fatalError("/etc/fstab file missing\n");
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}
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do_em_all();
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break;
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default:
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goto usage_and_exit;
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}
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}
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swap_enable_disable(*argv);
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exit(TRUE);
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usage_and_exit:
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usage((whichApp == SWAPON_APP) ? swapon_usage : swapoff_usage);
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exit(FALSE);
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}
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