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 version 2, see the file LICENSE in this tarball.
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*/
#include "libbb.h"
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#include <mntent.h>
#include <sys/swap.h>
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#if ENABLE_FEATURE_SWAPON_PRI
struct globals {
int flags;
};
#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)
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{
int status;
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struct stat st;
xstat(device, &st);
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#if ENABLE_DESKTOP
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/* 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");
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#endif
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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;
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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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}
int swap_on_off_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int swap_on_off_main(int argc UNUSED_PARAM, char **argv)
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{
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
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return do_em_all();
argv += optind;
if (!*argv)
bb_show_usage();
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/* ret = 0; redundant */
do {
ret += swap_enable_disable(*argv);
} while (*++argv);
return ret;
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}