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/* 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 <mntent.h>
#include <dirent.h>
#include <errno.h>
#include <linux/unistd.h>
_syscall2(int, swapon, const char *, path, int, flags);
_syscall1(int, swapoff, const char *, path);
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 (strcmp(m->mnt_type, MNTTYPE_SWAP)==0) {
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);
}
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