122 lines
2.6 KiB
C
122 lines
2.6 KiB
C
/*
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* Mini swapon/swapoff implementation for busybox
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*
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* Copyright (C) 1998 by Erik Andersen <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 <sys/swap.h>
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#include <mntent.h>
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#include <dirent.h>
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#include <fstab.h>
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#include <errno.h>
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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 device\n"
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"\nStop swapping virtual memory pages on the given device.\n";
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static const char swapon_usage[] =
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"swapon device\n"
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"\nStart swapping virtual memory pages on the given device.\n";
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#define SWAPON_APP 1
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#define SWAPOFF_APP 2
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static void
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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
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do_em_all()
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{
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struct mntent *m;
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char swapName[NAME_MAX];
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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 (!strstr (m->mnt_type, "swap")) {
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swap_enable_disable( swapName);
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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
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swap_on_off_main(int argc, char * * argv)
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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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fprintf(stderr, "/etc/fstab file missing -- Please install one.\n\n");
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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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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)) switch (**argv) {
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case 'a':
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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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