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#include <stdio.h>
#include <errno.h>
#include <getopt.h>
#ifdef HAVE_SYS_SWAP_H
# include <sys/swap.h>
#endif
#include "nls.h"
#include "c.h"
#include "closestream.h"
#include "swapon-common.h"
#ifndef SWAPON_HAS_TWO_ARGS
/* libc is insane, let's call the kernel */
# include <sys/syscall.h>
# define swapoff(path) syscall(SYS_swapoff, path)
#endif
static int verbose;
static int all;
#define QUIET 1
#define CANONIC 1
static int do_swapoff(const char *orig_special, int quiet, int canonic)
{
const char *special = orig_special;
if (verbose)
printf(_("swapoff %s\n"), orig_special);
if (!canonic) {
special = mnt_resolve_spec(orig_special, mntcache);
if (!special)
return cannot_find(orig_special);
}
if (swapoff(special) == 0)
return 0; /* success */
if (errno == EPERM)
errx(EXIT_FAILURE, _("Not superuser."));
if (!quiet || errno == ENOMEM)
warn(_("%s: swapoff failed"), orig_special);
return -1;
}
static int swapoff_by_label(const char *label, int quiet)
{
const char *special = mnt_resolve_tag("LABEL", label, mntcache);
return special ? do_swapoff(special, quiet, CANONIC) : cannot_find(label);
}
static int swapoff_by_uuid(const char *uuid, int quiet)
{
const char *special = mnt_resolve_tag("UUID", uuid, mntcache);
return special ? do_swapoff(special, quiet, CANONIC) : cannot_find(uuid);
}
static void __attribute__ ((__noreturn__)) usage(FILE * out)
{
fputs(USAGE_HEADER, out);
fprintf(out, _(" %s [options] [<spec>]\n"), program_invocation_short_name);
fputs(USAGE_OPTIONS, out);
fputs(_(" -a, --all disable all swaps from /proc/swaps\n"
" -v, --verbose verbose mode\n"), out);
fputs(USAGE_SEPARATOR, out);
fputs(USAGE_HELP, out);
fputs(USAGE_VERSION, out);
fputs(_("\nThe <spec> parameter:\n" \
" -L <label> LABEL of device to be used\n" \
" -U <uuid> UUID of device to be used\n" \
" LABEL=<label> LABEL of device to be used\n" \
" UUID=<uuid> UUID of device to be used\n" \
" <device> name of device to be used\n" \
" <file> name of file to be used\n"), out);
fprintf(out, USAGE_MAN_TAIL("swapoff(8)"));
exit(out == stderr ? EXIT_FAILURE : EXIT_SUCCESS);
}
static int swapoff_all(void)
{
int status = 0;
struct libmnt_table *tb;
struct libmnt_fs *fs;
struct libmnt_iter *itr = mnt_new_iter(MNT_ITER_BACKWARD);
if (!itr)
err(EXIT_FAILURE, _("failed to initialize libmount iterator"));
/*
* In case /proc/swaps exists, unswap stuff listed there. We are quiet
* but report errors in status. Errors might mean that /proc/swaps
* exists as ordinary file, not in procfs. do_swapoff() exits
* immediately on EPERM.
*/
tb = get_swaps();
while (tb && mnt_table_find_next_fs(tb, itr, match_swap, NULL, &fs) == 0)
status |= do_swapoff(mnt_fs_get_source(fs), QUIET, CANONIC);
/*
* Unswap stuff mentioned in /etc/fstab. Probably it was unmounted
* already, so errors are not bad. Doing swapoff -a twice should not
* give error messages.
*/
tb = get_fstab();
mnt_reset_iter(itr, MNT_ITER_FORWARD);
while (tb && mnt_table_find_next_fs(tb, itr, match_swap, NULL, &fs) == 0) {
if (!is_active_swap(mnt_fs_get_source(fs)))
do_swapoff(mnt_fs_get_source(fs), QUIET, !CANONIC);
}
mnt_free_iter(itr);
return status;
}
int main(int argc, char *argv[])
{
int status = 0, c;
size_t i;
static const struct option long_opts[] = {
{ "all", 0, 0, 'a' },
{ "help", 0, 0, 'h' },
{ "verbose", 0, 0, 'v' },
{ "version", 0, 0, 'V' },
{ NULL, 0, 0, 0 }
};
setlocale(LC_ALL, "");
bindtextdomain(PACKAGE, LOCALEDIR);
textdomain(PACKAGE);
atexit(close_stdout);
while ((c = getopt_long(argc, argv, "ahvVL:U:",
long_opts, NULL)) != -1) {
switch (c) {
case 'a': /* all */
++all;
break;
case 'h': /* help */
usage(stdout);
break;
case 'v': /* be chatty */
++verbose;
break;
case 'V': /* version */
printf(UTIL_LINUX_VERSION);
return EXIT_SUCCESS;
case 'L':
add_label(optarg);
break;
case 'U':
add_uuid(optarg);
break;
case '?':
default:
usage(stderr);
}
}
argv += optind;
if (!all && !numof_labels() && !numof_uuids() && *argv == NULL)
usage(stderr);
mnt_init_debug(0);
mntcache = mnt_new_cache();
for (i = 0; i < numof_labels(); i++)
status |= swapoff_by_label(get_label(i), !QUIET);
for (i = 0; i < numof_uuids(); i++)
status |= swapoff_by_uuid(get_uuid(i), !QUIET);
while (*argv != NULL)
status |= do_swapoff(*argv++, !QUIET, !CANONIC);
if (all)
status |= swapoff_all();
free_tables();
mnt_unref_cache(mntcache);
return status;
}
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