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

diff --git a/util-linux/freeramdisk.c b/util-linux/freeramdisk.c
index 43d42d424fb8c84a2949d31d674bfe88aadbc3ca..e5061dc34bba6bff32b064ec4ff86616632285f3 100644 (file)
--- a/util-linux/freeramdisk.c
+++ b/util-linux/freeramdisk.c
@@ -3,7 +3,7 @@
  * freeramdisk implementation for busybox
  *
  * Copyright (C) 2000 and written by Emanuele Caratti <wiz@iol.it>
- * Adjusted a bit by Erik Andersen <andersee@debian.org>
+ * Adjusted a bit by Erik Andersen <andersen@codepoet.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
@@ -23,40 +23,40 @@
 
 #include <stdio.h>
 #include <string.h>
-#include <sys/mount.h>
 #include <sys/types.h>
-#include <sys/stat.h>
 #include <fcntl.h>
 #include <sys/ioctl.h>
-#include <errno.h>
-#include "internal.h"
+#include <stdlib.h>
+#include <unistd.h>
+#include "busybox.h"
 
 
-static const char freeramdisk_usage[] =
-       "freeramdisk DEVICE\n\n"
-       "Frees all memory used by the specified ramdisk.\n";
+/* From linux/fs.h */
+#define BLKFLSBUF  _IO(0x12,97)        /* flush buffer cache */
 
 extern int
 freeramdisk_main(int argc, char **argv)
 {
-       char  rname[256] = "/dev/ram";
-       int   f;
+       int result;
+       int fd;
 
-       if (argc > 2 || ( argv[1] && *argv[1] == '-')) {
-               usage(freeramdisk_usage);
+       if (argc != 2) {
+               bb_show_usage();
        }
 
-       if (argc >1)
-               strcpy(rname, argv[1]);
+       fd = bb_xopen(argv[1], O_RDWR);
 
-       if ((f = open(rname, O_RDWR)) == -1) {
-               fatalError( "freeramdisk: cannot open %s: %s", rname, strerror(errno));
+       result = ioctl(fd, BLKFLSBUF);
+#ifdef CONFIG_FEATURE_CLEAN_UP
+       close(fd);
+#endif
+       if (result < 0) {
+               bb_perror_msg_and_die("failed ioctl on %s", argv[1]);
        }
-       if (ioctl(f, BLKFLSBUF) < 0) {
-               fatalError( "freeramdisk: failed ioctl on %s: %s", rname, strerror(errno));
-       }
-       close(f);
-       exit(TRUE);
+
+       /* Don't bother closing.  Exit does
+        * that, so we can save a few bytes */
+       return EXIT_SUCCESS;
 }
 
 /*