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/* vi: set sw=4 ts=4: */
/*
* Mini swapon/swapoff implementation for busybox
*
* Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
*
* Licensed under the GPL v2, see the file LICENSE in this tarball.
*/
#include <stdio.h>
#include <mntent.h>
#include <dirent.h>
#include <errno.h>
#include <string.h>
#include <stdlib.h>
#include <sys/mount.h>
#include <sys/swap.h>
#include "busybox.h"
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 (bb_applet_name[5] == 'n')
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;
int err;
f = setmntent("/etc/fstab", "r");
if (f == NULL)
bb_perror_msg_and_die("/etc/fstab");
err = 0;
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;
}
#define DO_ALL 0x01
extern int swap_on_off_main(int argc, char **argv)
{
unsigned long opt = bb_getopt_ulflags(argc, argv, "a");
if (argc != 2)
bb_show_usage();
if (opt & DO_ALL)
return do_em_all();
return swap_enable_disable(argv[1]);
}
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