busybox/util-linux/swaponoff.c

110 lines
2.0 KiB
C
Raw Normal View History

/* vi: set sw=4 ts=4: */
1999-10-19 02:52:59 +05:30
/*
* Mini swapon/swapoff implementation for busybox
*
* Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
1999-10-19 02:52:59 +05:30
*
* Licensed under the GPL version 2, see the file LICENSE in this tarball.
1999-10-19 02:52:59 +05:30
*/
#include "libbb.h"
1999-10-19 02:52:59 +05:30
#include <mntent.h>
#include <sys/swap.h>
1999-10-19 02:52:59 +05:30
#if ENABLE_FEATURE_MOUNT_LABEL
# include "volume_id.h"
#else
# define resolve_mount_spec(fsname) ((void)0)
#endif
#if ENABLE_FEATURE_SWAPON_PRI
struct globals {
int flags;
} FIX_ALIASING;
#define G (*(struct globals*)&bb_common_bufsiz1)
#define g_flags (G.flags)
#else
#define g_flags 0
#endif
static int swap_enable_disable(char *device)
1999-10-19 02:52:59 +05:30
{
int status;
2002-11-03 05:55:23 +05:30
struct stat st;
resolve_mount_spec(&device);
xstat(device, &st);
2002-11-03 05:55:23 +05:30
#if ENABLE_DESKTOP
2002-11-03 05:55:23 +05:30
/* test for holes */
if (S_ISREG(st.st_mode))
if (st.st_blocks * (off_t)512 < st.st_size)
bb_error_msg("warning: swap file has holes");
2007-03-12 23:46:24 +05:30
#endif
2006-10-04 02:30:43 +05:30
if (applet_name[5] == 'n')
status = swapon(device, g_flags);
else
status = swapoff(device);
if (status != 0) {
bb_simple_perror_msg(device);
return 1;
}
return 0;
1999-10-19 02:52:59 +05:30
}
static int do_em_all(void)
1999-10-19 02:52:59 +05:30
{
struct mntent *m;
FILE *f;
int err;
1999-10-19 02:52:59 +05:30
f = setmntent("/etc/fstab", "r");
if (f == NULL)
2003-03-19 14:43:01 +05:30
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;
1999-10-19 02:52:59 +05:30
}
int swap_on_off_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
2008-07-05 14:48:54 +05:30
int swap_on_off_main(int argc UNUSED_PARAM, char **argv)
1999-10-19 02:52:59 +05:30
{
int ret;
#if !ENABLE_FEATURE_SWAPON_PRI
ret = getopt32(argv, "a");
#else
opt_complementary = "p+";
ret = getopt32(argv, (applet_name[5] == 'n') ? "ap:" : "a", &g_flags);
if (ret & 2) { // -p
g_flags = SWAP_FLAG_PREFER |
((g_flags & SWAP_FLAG_PRIO_MASK) << SWAP_FLAG_PRIO_SHIFT);
ret &= 1;
}
#endif
if (ret /* & 1: not needed */) // -a
2005-09-13 07:00:19 +05:30
return do_em_all();
argv += optind;
if (!*argv)
bb_show_usage();
2007-03-12 23:46:24 +05:30
/* ret = 0; redundant */
do {
ret += swap_enable_disable(*argv);
} while (*++argv);
return ret;
1999-10-19 02:52:59 +05:30
}