bc: convert to "G trick" - this returns bc to zero bss increase

[oweals/busybox.git] / util-linux / freeramdisk.c

diff --git a/util-linux/freeramdisk.c b/util-linux/freeramdisk.c
index 9e1c453e4fc7649f67e74e9fd71485f254d62ab1..6752e49d8926a5b1dba54389b14d3a770057ac02 100644 (file)
--- a/util-linux/freeramdisk.c
+++ b/util-linux/freeramdisk.c
@@ -6,29 +6,75 @@
  * 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 "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 = 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;
 }