source: MondoRescue/trunk/mindi-busybox/util-linux/swaponoff.c@ 904

/* vi: set sw=4 ts=4: */
/*
 * Mini swapon/swapoff implementation for busybox
 *
 * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
 *
 * Licensed under the GPL v2, see the file LICENSE in this tarball.
 */

#include "busybox.h"
#include <mntent.h>
#include <dirent.h>
#include <errno.h>
#include <string.h>
#include <sys/swap.h>


static int swap_enable_disable(const char *device)
{
    int status;
    struct stat st;

    xstat(device, &st);

    /* test for holes */
    if (S_ISREG(st.st_mode))
        if (st.st_blocks * 512 < st.st_size)
            bb_error_msg_and_die("swap file has holes");

    if (bb_applet_name[5] == 'n')
        status = swapon(device, 0);
    else
        status = swapoff(device);

    if (status != 0) {
        bb_perror_msg("%s", device);
        return 1;
    }

    return 0;
}

static int do_em_all(void)
{
    struct mntent *m;
    FILE *f;
    int err;

    f = setmntent("/etc/fstab", "r");
    if (f == NULL)
        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;
}

#define DO_ALL    0x01

int swap_on_off_main(int argc, char **argv)
{
    int ret;

    if (argc == 1)
        bb_show_usage();

    ret = bb_getopt_ulflags(argc, argv, "a");
    if (ret & DO_ALL)
        return do_em_all();

    ret = 0;
    while (*++argv)
        ret += swap_enable_disable(*argv);
    return ret;
}