*
* Licensed under GPLv2, see file LICENSE in this source tree.
*/
+//config:config SWAPON
+//config: bool "swapon (4.9 kb)"
+//config: default y
+//config: select PLATFORM_LINUX
+//config: help
+//config: Once you have created some swap space using 'mkswap', you also need
+//config: to enable your swap space with the 'swapon' utility. The 'swapoff'
+//config: utility is used, typically at system shutdown, to disable any swap
+//config: space. If you are not using any swap space, you can leave this
+//config: option disabled.
+//config:
+//config:config FEATURE_SWAPON_DISCARD
+//config: bool "Support discard option -d"
+//config: default y
+//config: depends on SWAPON
+//config: help
+//config: Enable support for discarding swap area blocks at swapon and/or as
+//config: the kernel frees them. This option enables both the -d option on
+//config: 'swapon' and the 'discard' option for swap entries in /etc/fstab.
+//config:
+//config:config FEATURE_SWAPON_PRI
+//config: bool "Support priority option -p"
+//config: default y
+//config: depends on SWAPON
+//config: help
+//config: Enable support for setting swap device priority in swapon.
+//config:
+//config:config SWAPOFF
+//config: bool "swapoff (4.3 kb)"
+//config: default y
+//config: select PLATFORM_LINUX
+//config:
+//config:config FEATURE_SWAPONOFF_LABEL
+//config: bool "Support specifying devices by label or UUID"
+//config: default y
+//config: depends on SWAPON || SWAPOFF
+//config: select VOLUMEID
+//config: help
+//config: This allows for specifying a device by label or uuid, rather than by
+//config: name. This feature utilizes the same functionality as blkid/findfs.
+
+// APPLET_ODDNAME:name main location suid_type help
+//applet:IF_SWAPON( APPLET_ODDNAME(swapon, swap_on_off, BB_DIR_SBIN, BB_SUID_DROP, swapon))
+//applet:IF_SWAPOFF(APPLET_ODDNAME(swapoff, swap_on_off, BB_DIR_SBIN, BB_SUID_DROP, swapoff))
+
+//kbuild:lib-$(CONFIG_SWAPON) += swaponoff.o
+//kbuild:lib-$(CONFIG_SWAPOFF) += swaponoff.o
//usage:#define swapon_trivial_usage
-//usage: "[-a]" IF_FEATURE_SWAPON_DISCARD(" [-d[POL]]") IF_FEATURE_SWAPON_PRI(" [-p PRI]") " [DEVICE]"
+//usage: "[-a] [-e]" IF_FEATURE_SWAPON_DISCARD(" [-d[POL]]") 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: "\n -d[POL] Discard blocks at swapon (POL=once),"
//usage: "\n as freed (POL=pages), or both (POL omitted)"
//usage: )
+//usage: "\n -e Silently skip devices that do not exist"
//usage: IF_FEATURE_SWAPON_PRI(
//usage: "\n -p PRI Set swap device priority"
//usage: )
//usage: "\n -a Stop swapping on all swap devices"
#include "libbb.h"
+#include "common_bufsiz.h"
#include <mntent.h>
#ifndef __BIONIC__
# include <sys/swap.h>
#endif
-#if ENABLE_FEATURE_MOUNT_LABEL
+#if ENABLE_FEATURE_SWAPONOFF_LABEL
# include "volume_id.h"
#else
# define resolve_mount_spec(fsname) ((void)0)
struct globals {
int flags;
} FIX_ALIASING;
-#define G (*(struct globals*)&bb_common_bufsiz1)
+#define G (*(struct globals*)bb_common_bufsiz1)
#define g_flags (G.flags)
#define save_g_flags() int save_g_flags = g_flags
#define restore_g_flags() g_flags = save_g_flags
#define save_g_flags() ((void)0)
#define restore_g_flags() ((void)0)
#endif
-#define INIT_G() do { } while (0)
-
-#define do_swapoff (applet_name[5] == 'f')
+#define INIT_G() do { setup_common_bufsiz(); } while (0)
+
+#if ENABLE_SWAPOFF
+# if ENABLE_SWAPON
+# define do_swapoff (applet_name[5] == 'f')
+# else
+# define do_swapoff 1
+# endif
+#else
+# define do_swapoff 0
+#endif
/* Command line options */
enum {
OPTBIT_a, /* -a all */
+ OPTBIT_e, /* -e ifexists */
IF_FEATURE_SWAPON_DISCARD( OPTBIT_d ,) /* -d discard */
IF_FEATURE_SWAPON_PRI ( OPTBIT_p ,) /* -p priority */
OPT_a = 1 << OPTBIT_a,
+ OPT_e = 1 << OPTBIT_e,
OPT_d = IF_FEATURE_SWAPON_DISCARD((1 << OPTBIT_d)) + 0,
OPT_p = IF_FEATURE_SWAPON_PRI ((1 << OPTBIT_p)) + 0,
};
#define OPT_ALL (option_mask32 & OPT_a)
#define OPT_DISCARD (option_mask32 & OPT_d)
+#define OPT_IFEXISTS (option_mask32 & OPT_e)
#define OPT_PRIO (option_mask32 & OPT_p)
static int swap_enable_disable(char *device)
{
int err = 0;
int quiet = 0;
- struct stat st;
resolve_mount_spec(&device);
quiet = (OPT_ALL && (errno == EINVAL || errno == ENOENT));
} else {
/* swapon */
+ struct stat st;
err = stat(device, &st);
if (!err) {
if (ENABLE_DESKTOP && S_ISREG(st.st_mode)) {
/* Don't complain on swapon -a if device is already in use */
quiet = (OPT_ALL && errno == EBUSY);
}
+ /* Don't complain if file does not exist with -e option */
+ if (err && OPT_IFEXISTS && errno == ENOENT)
+ err = 0;
}
- if (err) {
- if (!quiet)
- bb_simple_perror_msg(device);
+ if (err && !quiet) {
+ bb_simple_perror_msg(device);
return 1;
}
return 0;
return err;
}
-#define OPTSTR_SWAPON "a" \
+#define OPTSTR_SWAPON "ae" \
IF_FEATURE_SWAPON_DISCARD("d::") \
IF_FEATURE_SWAPON_PRI("p:")
INIT_G();
- getopt32(argv, do_swapoff ? "a" : OPTSTR_SWAPON
+ getopt32(argv, do_swapoff ? "ae" : OPTSTR_SWAPON
IF_FEATURE_SWAPON_DISCARD(, &discard)
IF_FEATURE_SWAPON_PRI(, &prio)
);
projects / oweals / busybox.git / blobdiff