From 2523da259ce69cc3da5d7c02d2f8301f4de5408b Mon Sep 17 00:00:00 2001
From: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
Date: Sat, 18 Mar 2006 23:02:45 +0000
Subject: [PATCH] - explain what magic numbers we're using here.

---
 util-linux/freeramdisk.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/util-linux/freeramdisk.c b/util-linux/freeramdisk.c
index 923a15160..1f010c721 100644
--- a/util-linux/freeramdisk.c
+++ b/util-linux/freeramdisk.c
@@ -18,6 +18,11 @@
 #include <unistd.h>
 #include "busybox.h"
 
+/* From linux/fs.h */
+#define BLKFLSBUF  _IO(0x12,97)
+/* From <linux/fd.h> */
+#define FDFLUSH  _IO(2,0x4b)
+
 int freeramdisk_main(int argc, char **argv)
 {
 	int result;
@@ -29,7 +34,7 @@ int freeramdisk_main(int argc, char **argv)
 
 	// Act like freeramdisk, fdflush, or both depending on configuration.
 	result = ioctl(fd, (ENABLE_FREERAMDISK && bb_applet_name[1]=='r')
-			|| !ENABLE_FDFLUSH ? _IO(0x12,97) : _IO(2,0x4b));
+			|| !ENABLE_FDFLUSH ? BLKFLSBUF : FDFLUSH);
 
 	if (ENABLE_FEATURE_CLEAN_UP) close(fd);
 
-- 
2.25.1