+/* vi: set sw=4 ts=4: */
/*
* Mini swapon/swapoff implementation for busybox
*
+ * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
*
- * Copyright (C) 1999 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 GPLv2, see file LICENSE in this source tree.
*/
-#include "internal.h"
-#include <stdio.h>
-#include <sys/mount.h>
-#include <sys/swap.h>
+//usage:#define swapon_trivial_usage
+//usage: "[-a]" IF_FEATURE_SWAPON_PRI(" [-p PRI]") " [DEVICE]"
+//usage:#define swapon_full_usage "\n\n"
+//usage: "Start swapping on DEVICE\n"
+//usage: "\n -a Start swapping on all swap devices"
+//usage: IF_FEATURE_SWAPON_PRI(
+//usage: "\n -p PRI Set swap device priority"
+//usage: )
+//usage:
+//usage:#define swapoff_trivial_usage
+//usage: "[-a] [DEVICE]"
+//usage:#define swapoff_full_usage "\n\n"
+//usage: "Stop swapping on DEVICE\n"
+//usage: "\n -a Stop swapping on all swap devices"
+
+#include "libbb.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 device\n"
-"\nStop swapping virtual memory pages on the given device.\n";
-static const char swapon_usage[] =
-"swapon device\n"
-"\nStart swapping virtual memory pages on the given device.\n";
+#ifndef __BIONIC__
+# include <sys/swap.h>
+#endif
+
+#if ENABLE_FEATURE_MOUNT_LABEL
+# include "volume_id.h"
+#else
+# define resolve_mount_spec(fsname) ((void)0)
+#endif
+
+#ifndef MNTTYPE_SWAP
+# define MNTTYPE_SWAP "swap"
+#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
+#define INIT_G() do { } while (0)
+
+static int swap_enable_disable(char *device)
+{
+ int status;
+ struct stat st;
+
+ resolve_mount_spec(&device);
+ xstat(device, &st);
+
+#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) {
+ bb_simple_perror_msg(device);
+ return 1;
+ }
+ return 0;
+}
-#define SWAPON_APP 1
-#define SWAPOFF_APP 2
+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) {
+ /* swapon -a should ignore entries with noauto,
+ * but swapoff -a should process them */
+ if (applet_name[5] != 'n'
+ || hasmntopt(m, MNTOPT_NOAUTO) == NULL
+ ) {
+#if ENABLE_FEATURE_SWAPON_PRI
+ char *p;
+ g_flags = 0; /* each swap space might have different flags */
+ p = hasmntopt(m, "pri");
+ if (p) {
+ /* Max allowed 32767 (==SWAP_FLAG_PRIO_MASK) */
+ unsigned int swap_prio = MIN(bb_strtou(p + 4 , NULL, 10), SWAP_FLAG_PRIO_MASK);
+ /* We want to allow "NNNN,foo", thus errno == EINVAL is allowed too */
+ if (errno != ERANGE) {
+ g_flags = SWAP_FLAG_PREFER |
+ (swap_prio << SWAP_FLAG_PRIO_SHIFT);
+ }
+ }
+#endif
+ err += swap_enable_disable(m->mnt_fsname);
+ }
+ }
+ }
+ if (ENABLE_FEATURE_CLEAN_UP)
+ endmntent(f);
-static void
-swap_enable_disable( char *device)
-{
- int status;
- if ( whichApp == SWAPON_APP )
- status = swapon(device, 0);
- else
- status = swapoff(device);
-
- if ( status != 0 ) {
- perror(appName);
- exit( FALSE);
- }
+ return err;
}
-static void
-do_em_all()
+int swap_on_off_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
+int swap_on_off_main(int argc UNUSED_PARAM, char **argv)
{
- struct mntent *m;
- FILE *f = setmntent ("/etc/fstab", "r");
+ int ret;
- if (f == NULL) {
- perror("/etc/fstab");
- exit( FALSE);
- }
- while ((m = getmntent (f)) != NULL) {
- if (!strstr (m->mnt_type, MNTTYPE_SWAP)) {
- swap_enable_disable( m->mnt_fsname);
- }
- }
- endmntent (f);
- exit( TRUE);
-}
+ INIT_G();
+#if !ENABLE_FEATURE_SWAPON_PRI
+ ret = getopt32(argv, "a");
+#else
+ if (applet_name[5] == 'n')
+ opt_complementary = "p+";
+ ret = getopt32(argv, (applet_name[5] == 'n') ? "ap:" : "a", &g_flags);
-extern int
-swap_on_off_main(int argc, char * * argv)
-{
- struct stat statBuf;
- if (stat("/etc/fstab", &statBuf) < 0)
- fprintf(stderr, "/etc/fstab file missing -- Please install one.\n\n");
-
- if (strcmp(*argv, "swapon")==0) {
- appName = *argv;
- whichApp = SWAPON_APP;
-
- } else {
- appName = *argv;
- whichApp = SWAPOFF_APP;
- }
-
- if (argc < 2)
- goto usage_and_exit;
- argc--;
- argv++;
-
- /* Parse any options */
- while (**argv == '-') {
- while (*++(*argv)) switch (**argv) {
- case 'a':
- do_em_all();
- break;
- default:
- goto usage_and_exit;
+ 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);
- exit( TRUE);
+#endif
-usage_and_exit:
- usage( (whichApp==SWAPON_APP)? swapon_usage : swapoff_usage);
- exit( FALSE);
-}
+ 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);
+
+ return ret;
+}
projects / platform / upstream / busybox.git / blobdiff