/*
* Mini swapon/swapoff implementation for busybox
*
+ * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
*
- * Copyright (C) 1999,2000 by Lineo, inc.
- * Written by Erik Andersen <andersen@lineo.com>, <andersee@debian.org>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- *
+ * Licensed under the GPL version 2, see the file LICENSE in this tarball.
*/
-#include "internal.h"
-#include <stdio.h>
-#include <sys/mount.h>
-#include <sys/swap.h>
+#include "busybox.h"
#include <mntent.h>
-#include <dirent.h>
-#include <fstab.h>
-#include <errno.h>
-
-
-static int whichApp;
-static const char *appName;
-
-static const char swapoff_usage[] =
- "swapoff [OPTION] [device]\n"
-#ifndef BB_FEATURE_TRIVIAL_HELP
- "\nStop swapping virtual memory pages on the given device.\n\n"
- "Options:\n"
- "\t-a\tStop swapping on all swap devices\n"
-#endif
- ;
-
-static const char swapon_usage[] =
- "swapon [OPTION] [device]\n"
-#ifndef BB_FEATURE_TRIVIAL_HELP
- "\nStart swapping virtual memory pages on the given device.\n\n"
- "Options:\n"
- "\t-a\tStart swapping on all swap devices\n"
-#endif
- ;
-
-
-#define SWAPON_APP 1
-#define SWAPOFF_APP 2
+#include <sys/swap.h>
-static void swap_enable_disable(char *device)
+static int swap_enable_disable(char *device)
{
int status;
+ struct stat st;
- if (whichApp == SWAPON_APP)
+ 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 (applet_name[5] == 'n')
status = swapon(device, 0);
else
status = swapoff(device);
if (status != 0) {
- perror(appName);
- exit(FALSE);
+ bb_perror_msg("%s", device);
+ return 1;
}
+
+ return 0;
}
-static void do_em_all()
+static int do_em_all(void)
{
struct mntent *m;
- FILE *f = setmntent("/etc/fstab", "r");
+ 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);
- if (f == NULL) {
- perror("/etc/fstab");
- exit(FALSE);
- }
- while ((m = getmntent(f)) != NULL) {
- if (strcmp(m->mnt_type, MNTTYPE_SWAP)==0) {
- swap_enable_disable(m->mnt_fsname);
- }
- }
endmntent(f);
- exit(TRUE);
+
+ return err;
}
+#define DO_ALL 0x01
-extern int swap_on_off_main(int argc, char **argv)
+int swap_on_off_main(int argc, char **argv);
+int swap_on_off_main(int argc, char **argv)
{
- if (strcmp(*argv, "swapon") == 0) {
- appName = *argv;
- whichApp = SWAPON_APP;
+ int ret;
- } else {
- appName = *argv;
- whichApp = SWAPOFF_APP;
- }
+ if (argc == 1)
+ bb_show_usage();
- if (argc != 2) {
- goto usage_and_exit;
- }
- argc--;
- argv++;
-
- /* Parse any options */
- while (**argv == '-') {
- while (*++(*argv))
- switch (**argv) {
- case 'a':
- {
- struct stat statBuf;
-
- if (stat("/etc/fstab", &statBuf) < 0)
- fatalError("/etc/fstab file missing\n");
- }
- do_em_all();
- break;
- default:
- goto usage_and_exit;
- }
- }
- swap_enable_disable(*argv);
- exit(TRUE);
+ ret = getopt32(argc, argv, "a");
+ if (ret & DO_ALL)
+ return do_em_all();
- usage_and_exit:
- usage((whichApp == SWAPON_APP) ? swapon_usage : swapoff_usage);
- exit(FALSE);
+ ret = 0;
+ while (*++argv)
+ ret += swap_enable_disable(*argv);
+ return ret;
}