82 lines
1.5 KiB
C
82 lines
1.5 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* Mini swapon/swapoff implementation for busybox
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*
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* Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
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*
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* Licensed under the GPL v2, see the file LICENSE in this tarball.
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*/
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#include <stdio.h>
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#include <mntent.h>
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#include <dirent.h>
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#include <errno.h>
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#include <string.h>
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#include <stdlib.h>
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#include <sys/mount.h>
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#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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{
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int status;
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struct stat st;
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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 */
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if (S_ISREG(st.st_mode))
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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')
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status = swapon(device, 0);
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else
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status = swapoff(device);
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if (status != 0) {
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bb_perror_msg("%s", device);
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return EXIT_FAILURE;
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}
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return EXIT_SUCCESS;
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}
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static int do_em_all(void)
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{
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struct mntent *m;
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FILE *f;
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int err;
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f = setmntent("/etc/fstab", "r");
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if (f == NULL)
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bb_perror_msg_and_die("/etc/fstab");
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err = 0;
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while ((m = getmntent(f)) != NULL)
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if (strcmp(m->mnt_type, MNTTYPE_SWAP) == 0)
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if (swap_enable_disable(m->mnt_fsname) == EXIT_FAILURE)
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++err;
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endmntent(f);
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return err;
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}
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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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{
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unsigned long opt = bb_getopt_ulflags(argc, argv, "a");
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if (argc != 2)
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bb_show_usage();
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if (opt & DO_ALL)
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return do_em_all();
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return swap_enable_disable(argv[1]);
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}
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