[T106][ZXW-22]7520V3SCV2.01.01.02P42U09_VEC_V0.8_AP_VEC origin source commit
Change-Id: Ic6e05d89ecd62fc34f82b23dcf306c93764aec4b
diff --git a/ap/app/busybox/src/util-linux/freeramdisk.c b/ap/app/busybox/src/util-linux/freeramdisk.c
new file mode 100644
index 0000000..a89ae1a
--- /dev/null
+++ b/ap/app/busybox/src/util-linux/freeramdisk.c
@@ -0,0 +1,45 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * freeramdisk and fdflush implementations for busybox
+ *
+ * Copyright (C) 2000 and written by Emanuele Caratti <wiz@iol.it>
+ * Adjusted a bit by Erik Andersen <andersen@codepoet.org>
+ * Unified with fdflush by Tito Ragusa <farmatito@tiscali.it>
+ *
+ * Licensed under GPLv2, see file LICENSE in this source tree.
+ */
+
+//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) MAIN_EXTERNALLY_VISIBLE;
+int freeramdisk_main(int argc UNUSED_PARAM, char **argv)
+{
+ int fd;
+
+ fd = xopen(single_argv(argv), O_RDWR);
+
+ // Act like freeramdisk, fdflush, or both depending on configuration.
+ 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);
+
+ return EXIT_SUCCESS;
+}