* Adjusted a bit by Erik Andersen <andersen@codepoet.org>
* Unified with fdflush by Tito Ragusa <farmatito@tiscali.it>
*
- * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
+ * Licensed under GPLv2, see file LICENSE in this source tree.
*/
+//config:config FDFLUSH
+//config: bool "fdflush (1.4 kb)"
+//config: default y
+//config: select PLATFORM_LINUX
+//config: help
+//config: fdflush is only needed when changing media on slightly-broken
+//config: removable media drives. It is used to make Linux believe that a
+//config: hardware disk-change switch has been actuated, which causes Linux to
+//config: forget anything it has cached from the previous media. If you have
+//config: such a slightly-broken drive, you will need to run fdflush every time
+//config: you change a disk. Most people have working hardware and can safely
+//config: leave this disabled.
+//config:
+//config:config FREERAMDISK
+//config: bool "freeramdisk (1.4 kb)"
+//config: default y
+//config: select PLATFORM_LINUX
+//config: help
+//config: Linux allows you to create ramdisks. This utility allows you to
+//config: delete them and completely free all memory that was used for the
+//config: ramdisk. For example, if you boot Linux into a ramdisk and later
+//config: pivot_root, you may want to free the memory that is allocated to the
+//config: ramdisk. If you have no use for freeing memory from a ramdisk, leave
+//config: this disabled.
-#include <stdio.h>
-#include <string.h>
-#include <sys/types.h>
-#include <fcntl.h>
-#include <sys/ioctl.h>
-#include <stdlib.h>
-#include <unistd.h>
-#include "busybox.h"
+// APPLET_ODDNAME:name main location suid_type help
+//applet:IF_FDFLUSH( APPLET_ODDNAME(fdflush, freeramdisk, BB_DIR_BIN, BB_SUID_DROP, fdflush ))
+//applet:IF_FREERAMDISK(APPLET_NOEXEC(freeramdisk, freeramdisk, BB_DIR_SBIN, BB_SUID_DROP, freeramdisk))
+
+//kbuild:lib-$(CONFIG_FDFLUSH) += freeramdisk.o
+//kbuild:lib-$(CONFIG_FREERAMDISK) += freeramdisk.o
+
+//usage:#define freeramdisk_trivial_usage
+//usage: "DEVICE"
+//usage:#define freeramdisk_full_usage "\n\n"
+//usage: "Free all memory used by the specified ramdisk"
+//usage:
+//usage:#define freeramdisk_example_usage
+//usage: "$ freeramdisk /dev/ram2\n"
+//usage:
+//usage:#define fdflush_trivial_usage
+//usage: "DEVICE"
+//usage:#define fdflush_full_usage "\n\n"
+//usage: "Force floppy disk drive to detect disk change"
+
+#include <sys/mount.h>
+#include "libbb.h"
/* From <linux/fd.h> */
#define FDFLUSH _IO(2,0x4b)
-int freeramdisk_main(int argc, char **argv)
+int freeramdisk_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
+int freeramdisk_main(int argc UNUSED_PARAM, char **argv)
{
- int result;
int fd;
- if (argc != 2) bb_show_usage();
-
- fd = bb_xopen(argv[1], O_RDWR);
+ fd = xopen(single_argv(argv), O_RDWR);
// Act like freeramdisk, fdflush, or both depending on configuration.
- result = ioctl(fd, (ENABLE_FREERAMDISK && bb_applet_name[1]=='r')
- || !ENABLE_FDFLUSH ? BLKFLSBUF : FDFLUSH);
+ ioctl_or_perror_and_die(fd,
+ ((ENABLE_FREERAMDISK && applet_name[1] == 'r') || !ENABLE_FDFLUSH)
+ ? BLKFLSBUF
+ : FDFLUSH,
+ NULL, "%s", argv[1]
+ );
if (ENABLE_FEATURE_CLEAN_UP) close(fd);
- if (result) bb_perror_msg_and_die("%s", argv[1]);
return EXIT_SUCCESS;
}