busybox/util-linux/swaponoff.c

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/* vi: set sw=4 ts=4: */
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/*
* Mini swapon/swapoff implementation for busybox
*
* Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
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*
* Licensed under the GPL v2, see the file LICENSE in this tarball.
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*/
#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>
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#include "busybox.h"
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static int swap_enable_disable(const char *device)
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{
int status;
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struct stat st;
if (stat(device, &st) < 0)
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bb_perror_msg_and_die("cannot stat %s", device);
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/* test for holes */
if (S_ISREG(st.st_mode))
if (st.st_blocks * 512 < st.st_size)
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bb_error_msg_and_die("swap file has holes");
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if (bb_applet_name[5] == 'n')
status = swapon(device, 0);
else
status = swapoff(device);
if (status != 0) {
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bb_perror_msg("%s", device);
return 1;
}
return 0;
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}
static int do_em_all(void)
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{
struct mntent *m;
FILE *f;
int err;
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f = setmntent("/etc/fstab", "r");
if (f == NULL)
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bb_perror_msg_and_die("/etc/fstab");
err = 0;
while ((m = getmntent(f)) != NULL)
if (strcmp(m->mnt_type, MNTTYPE_SWAP) == 0)
err += swap_enable_disable(m->mnt_fsname);
endmntent(f);
return err;
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}
#define DO_ALL 0x01
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extern int swap_on_off_main(int argc, char **argv)
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{
int ret;
if (argc == 1)
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bb_show_usage();
ret = bb_getopt_ulflags(argc, argv, "a");
if (ret & DO_ALL)
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return do_em_all();
ret = 0;
while (*++argv)
ret += swap_enable_disable(*argv);
return ret;
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}