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https://github.com/sheumann/hush.git
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129 lines
2.8 KiB
C
129 lines
2.8 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) 1999,2000 by Lineo, inc. and Erik Andersen
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* Copyright (C) 1999,2000,2001 by Erik Andersen <andersee@debian.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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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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#if __GNU_LIBRARY__ < 5
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/* libc5 doesn't have sys/swap.h, define these here. */
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extern int swapon (__const char *__path, int __flags);
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extern int swapoff (__const char *__path);
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#else
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#include <sys/swap.h>
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#endif
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#include "busybox.h"
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static int whichApp; /* default SWAPON_APP */
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static const int SWAPON_APP = 0;
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static const int SWAPOFF_APP = 1;
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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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perror_msg_and_die("cannot stat %s");
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}
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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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error_msg_and_die("swap file has holes");
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}
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}
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if (whichApp == SWAPON_APP)
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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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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 = setmntent("/etc/fstab", "r");
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int err = 0;
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if (f == NULL)
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perror_msg_and_die("/etc/fstab");
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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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}
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}
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endmntent(f);
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return err;
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}
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extern int swap_on_off_main(int argc, char **argv)
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{
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if (applet_name[5] == 'f') { /* "swapoff" */
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whichApp = SWAPOFF_APP;
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}
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if (argc != 2) {
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goto usage_and_exit;
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}
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argc--;
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argv++;
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/* Parse any options */
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while (**argv == '-') {
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while (*++(*argv))
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switch (**argv) {
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case 'a':
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{
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struct stat statBuf;
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if (stat("/etc/fstab", &statBuf) < 0)
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error_msg_and_die("/etc/fstab file missing");
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}
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return do_em_all();
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break;
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default:
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goto usage_and_exit;
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}
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}
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return swap_enable_disable(*argv);
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usage_and_exit:
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show_usage();
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}
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