Add in freeramdisk.c, which (duh) frees ramdisks. If you have any

ramdisks lying about and want to free up the memory they have used,
this baby is the answar you have been waiting for.
 -Erik

Changelog

@@ -1,5 +1,8 @@
 0.43
 	* Wrote basename.
+	* Added freeramdisk, which will free up all memory associated
+	    with a ram disk.  Contributed by Emanuele Caratti <wiz@iol.it>
+	    and then adjusted a bit by me.
 	* tar wouldn't create directory entries that don't end in '/',
 	    now it does (thanks to Avery Pennarun <apenwarr@worldvisions.ca>)
 	* Several fixes from Pavel Roskin <pavel_roskin@geocities.com>:

Makefile

@@ -25,7 +25,7 @@ BUILDTIME := $(shell TZ=GMT date "+%Y%m%d-%H%M")
 # Set the following to `true' to make a debuggable build.
 # Leave this set to `false' for production use.
 # eg: `make DODEBUG=true tests'
-DODEBUG = false
+DODEBUG = true
 
 # If you want a static binary, turn this on.  I can't think
 # of many situations where anybody would ever want it static, 

applets/busybox.c

@@ -97,6 +97,9 @@ static const struct Applet applets[] = {
 #ifdef BB_FREE					//usr/bin
 	{"free", free_main},
 #endif
+#ifdef BB_FREERAMDISK			//sbin
+	{"freeramdisk", freeramdisk_main},
+#endif
 #ifdef BB_DEALLOCVT				//usr/bin
 	{"deallocvt", deallocvt_main},
 #endif

busybox.c

@@ -97,6 +97,9 @@ static const struct Applet applets[] = {
 #ifdef BB_FREE					//usr/bin
 	{"free", free_main},
 #endif
+#ifdef BB_FREERAMDISK			//sbin
+	{"freeramdisk", freeramdisk_main},
+#endif
 #ifdef BB_DEALLOCVT				//usr/bin
 	{"deallocvt", deallocvt_main},
 #endif

busybox.def.h

@@ -25,6 +25,7 @@
 //#define BB_FDFLUSH
 #define BB_FIND
 #define BB_FREE
+#define BB_FREERAMDISK
 #define BB_FSCK_MINIX
 #define BB_GREP
 #define BB_GUNZIP

freeramdisk.c

@@ -0,0 +1,69 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * freeramdisk implementation for busybox
+ *
+ * Copyright (C) 2000 and written by Emanuele Caratti <wiz@iol.it>
+ * Adjusted a bit by Erik Andersen <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
+ *
+ */
+
+#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"
+
+
+static const char freeramdisk_usage[] =
+	"freeramdisk DEVICE\n\n"
+	"Frees all memory used by the specified ramdisk.\n";
+
+extern int
+freeramdisk_main(int argc, char **argv)
+{
+	char  rname[256] = "/dev/ram";
+	int   f;
+
+	if (argc >= 2 || ( argv[1] && *argv[1] == '-')) {
+		usage(freeramdisk_usage);
+	}
+
+	if (argc >1)
+		strcpy(rname, argv[1]);
+
+	if ((f = open(rname, O_RDWR)) == -1) {
+		fatalError( "freeramdisk: cannot open %s: %s", rname, strerror(errno));
+	}
+	if (ioctl(f, BLKFLSBUF) < 0) {
+		fatalError( "freeramdisk: failed ioctl on %s: %s", rname, strerror(errno));
+	}
+	close(f);
+	exit(TRUE);
+}
+
+/*
+Local Variables:
+c-file-style: "linux"
+c-basic-offset: 4
+tab-width: 4
+End:
+*/
+

internal.h

@@ -80,6 +80,7 @@ extern int fdflush_main(int argc, char **argv);
 extern int fsck_minix_main(int argc, char **argv);
 extern int find_main(int argc, char** argv);
 extern int free_main(int argc, char** argv);
+extern int freeramdisk_main(int argc, char** argv);
 extern int grep_main(int argc, char** argv);
 extern int gunzip_main (int argc, char** argv);
 extern int gzip_main(int argc, char** argv);

util-linux/freeramdisk.c

@@ -0,0 +1,69 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * freeramdisk implementation for busybox
+ *
+ * Copyright (C) 2000 and written by Emanuele Caratti <wiz@iol.it>
+ * Adjusted a bit by Erik Andersen <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
+ *
+ */
+
+#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"
+
+
+static const char freeramdisk_usage[] =
+	"freeramdisk DEVICE\n\n"
+	"Frees all memory used by the specified ramdisk.\n";
+
+extern int
+freeramdisk_main(int argc, char **argv)
+{
+	char  rname[256] = "/dev/ram";
+	int   f;
+
+	if (argc >= 2 || ( argv[1] && *argv[1] == '-')) {
+		usage(freeramdisk_usage);
+	}
+
+	if (argc >1)
+		strcpy(rname, argv[1]);
+
+	if ((f = open(rname, O_RDWR)) == -1) {
+		fatalError( "freeramdisk: cannot open %s: %s", rname, strerror(errno));
+	}
+	if (ioctl(f, BLKFLSBUF) < 0) {
+		fatalError( "freeramdisk: failed ioctl on %s: %s", rname, strerror(errno));
+	}
+	close(f);
+	exit(TRUE);
+}
+
+/*
+Local Variables:
+c-file-style: "linux"
+c-basic-offset: 4
+tab-width: 4
+End:
+*/
+

utility.c

@@ -84,7 +84,6 @@ extern void errorMsg(char *s, ...)
 
 	va_start(p, s);
 	fflush(stdout);
-	fprintf(stderr, "\n");
 	vfprintf(stderr, s, p);
 	fprintf(stderr, "\n");
 	va_end(p);
@@ -96,7 +95,6 @@ extern void fatalError(char *s, ...)
 
 	va_start(p, s);
 	fflush(stdout);
-	fprintf(stderr, "\n");
 	vfprintf(stderr, s, p);
 	fprintf(stderr, "\n");
 	va_end(p);