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/* vi: set sw=4 ts=4: */
/*
* Mini swapon/swapoff implementation for busybox
*
* Copyright (C) 1999-2003 by Erik Andersen <andersen@codepoet.org>
* Copyright (C) 1999-2003 by Erik Andersen <andersen@codepoet.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 <stdio.h>
#include <mntent.h>
#include <dirent.h>
#include <errno.h>
#include <string.h>
#include <stdlib.h>
#include <sys/mount.h>
#if __GNU_LIBRARY__ < 5
/* libc5 doesn't have sys/swap.h, define these here. */
extern int swapon (__const char *__path, int __flags);
extern int swapoff (__const char *__path);
#else
#include <sys/swap.h>
#endif
#include "busybox.h"
static int whichApp; /* default SWAPON_APP */
static const int SWAPON_APP = 0;
static const int SWAPOFF_APP = 1;
static int swap_enable_disable(const char *device)
{
int status;
struct stat st;
if (stat(device, &st) < 0) {
bb_perror_msg_and_die("cannot stat %s", device);
}
/* test for holes */
if (S_ISREG(st.st_mode)) {
if (st.st_blocks * 512 < st.st_size) {
bb_error_msg_and_die("swap file has holes");
}
}
if (whichApp == SWAPON_APP)
status = swapon(device, 0);
else
status = swapoff(device);
if (status != 0) {
bb_perror_msg("%s", device);
return EXIT_FAILURE;
}
return EXIT_SUCCESS;
}
static int do_em_all(void)
{
struct mntent *m;
FILE *f = setmntent("/etc/fstab", "r");
int err = 0;
if (f == NULL)
bb_perror_msg_and_die("/etc/fstab");
while ((m = getmntent(f)) != NULL) {
if (strcmp(m->mnt_type, MNTTYPE_SWAP)==0) {
if(swap_enable_disable(m->mnt_fsname) == EXIT_FAILURE)
err++;
}
}
endmntent(f);
return err;
}
extern int swap_on_off_main(int argc, char **argv)
{
if (bb_applet_name[5] == 'f') { /* "swapoff" */
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)
bb_error_msg_and_die("/etc/fstab file missing");
}
return do_em_all();
break;
default:
goto usage_and_exit;
}
}
return swap_enable_disable(*argv);
usage_and_exit:
bb_show_usage();
}
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