/*
* Mini swapon/swapoff implementation for busybox
*
- * Copyright (C) 1999,2000 by Lineo, inc. and Erik Andersen
- * Copyright (C) 1999,2000,2001 by Erik Andersen <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
+ * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
*
+ * Licensed under GPLv2, see file LICENSE in this source tree.
*/
-#include <stdio.h>
+#include "libbb.h"
#include <mntent.h>
-#include <dirent.h>
-#include <errno.h>
-#include <string.h>
-#include <stdlib.h>
-#include <sys/mount.h>
-
-#if __GNU_LIBRARY__ < 5
-/* libc5 doesn't have sys/swap.h, define these here. */
-extern int swapon (__const char *__path, int __flags);
-extern int swapoff (__const char *__path);
-#else
#include <sys/swap.h>
-#endif
-
-#include "busybox.h"
-static int whichApp;
-
-static const int SWAPON_APP = 1;
-static const int SWAPOFF_APP = 2;
+#if ENABLE_FEATURE_MOUNT_LABEL
+# include "volume_id.h"
+#else
+# define resolve_mount_spec(fsname) ((void)0)
+#endif
+#if ENABLE_FEATURE_SWAPON_PRI
+struct globals {
+ int flags;
+} FIX_ALIASING;
+#define G (*(struct globals*)&bb_common_bufsiz1)
+#define g_flags (G.flags)
+#else
+#define g_flags 0
+#endif
-static void swap_enable_disable(char *device)
+static int swap_enable_disable(char *device)
{
int status;
+ struct stat st;
+
+ resolve_mount_spec(&device);
+ xstat(device, &st);
- if (whichApp == SWAPON_APP)
- status = swapon(device, 0);
+#if ENABLE_DESKTOP
+ /* 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");
+#endif
+
+ if (applet_name[5] == 'n')
+ status = swapon(device, g_flags);
else
status = swapoff(device);
- if (status != 0)
- perror_msg_and_die(applet_name);
+ if (status != 0) {
+ bb_simple_perror_msg(device);
+ return 1;
+ }
+
+ return 0;
}
-static void do_em_all(void)
+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)
- perror_msg_and_die("/etc/fstab");
+ bb_perror_msg_and_die("/etc/fstab");
+
+ err = 0;
while ((m = getmntent(f)) != NULL) {
- if (strcmp(m->mnt_type, MNTTYPE_SWAP)==0) {
- swap_enable_disable(m->mnt_fsname);
+ if (strcmp(m->mnt_type, MNTTYPE_SWAP) == 0) {
+ /* swapon -a should ignore entries with noauto,
+ * but swapoff -a should process them */
+ if (applet_name[5] != 'n'
+ || hasmntopt(m, MNTOPT_NOAUTO) == NULL
+ ) {
+ err += swap_enable_disable(m->mnt_fsname);
+ }
}
}
- endmntent(f);
- exit(EXIT_SUCCESS);
-}
+ if (ENABLE_FEATURE_CLEAN_UP)
+ endmntent(f);
-extern int swap_on_off_main(int argc, char **argv)
+ return err;
+}
+
+int swap_on_off_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
+int swap_on_off_main(int argc UNUSED_PARAM, char **argv)
{
- if (strcmp(applet_name, "swapon") == 0) {
- whichApp = SWAPON_APP;
- } else {
- whichApp = SWAPOFF_APP;
- }
+ int ret;
- 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)
- error_msg_and_die("/etc/fstab file missing");
- }
- do_em_all();
- break;
- default:
- goto usage_and_exit;
- }
+#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;
}
- swap_enable_disable(*argv);
- return EXIT_SUCCESS;
+#endif
+
+ if (ret /* & 1: not needed */) // -a
+ return do_em_all();
+
+ argv += optind;
+ if (!*argv)
+ bb_show_usage();
+
+ /* ret = 0; redundant */
+ do {
+ ret += swap_enable_disable(*argv);
+ } while (*++argv);
- usage_and_exit:
- show_usage();
+ return ret;
}