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/*
* Mini swapon/swapoff implementation for busybox
*
* Copyright (C) 1998 by Erik Andersen <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 device\n"
"\nStop swapping virtual memory pages on the given device.\n";
static const char swapon_usage[] =
"swapon device\n"
"\nStart swapping virtual memory pages on the given device.\n";
#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;
char swapName[NAME_MAX];
FILE *f = setmntent ("/etc/fstab", "r");
if (f == NULL) {
perror("/etc/fstab");
exit( FALSE);
}
while ((m = getmntent (f)) != NULL) {
if (!strstr (m->mnt_type, "swap")) {
swap_enable_disable( swapName);
}
}
endmntent (f);
exit( TRUE);
}
extern int
swap_on_off_main(int argc, char * * argv)
{
struct stat statBuf;
if (stat("/etc/fstab", &statBuf) < 0)
fprintf(stderr, "/etc/fstab file missing -- Please install one.\n\n");
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':
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);
}
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