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- explain what magic numbers we're using here.

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This commit is contained in:
Bernhard Reutner-Fischer 2006-03-18 23:02:45 +00:00
parent 66753a3850
commit 2523da259c
1 changed files with 6 additions and 1 deletions
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7
util-linux/freeramdisk.c
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@ -18,6 +18,11 @@
#include <unistd.h> #include <unistd.h>
#include "busybox.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 freeramdisk_main(int argc, char **argv)
{ {
int result; int result;
@ -29,7 +34,7 @@ int freeramdisk_main(int argc, char **argv)
// Act like freeramdisk, fdflush, or both depending on configuration. // Act like freeramdisk, fdflush, or both depending on configuration.
result = ioctl(fd, (ENABLE_FREERAMDISK && bb_applet_name[1]=='r') 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); if (ENABLE_FEATURE_CLEAN_UP) close(fd);