Add fsfreeze(8)

This commit is contained in:
sin 2014-06-14 16:48:10 +01:00
parent 816199471f
commit 5d85bb0cfe
2 changed files with 52 additions and 0 deletions

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@ -31,6 +31,7 @@ SRC = \
eject.c \ eject.c \
fallocate.c \ fallocate.c \
free.c \ free.c \
fsfreeze.c \
getty.c \ getty.c \
halt.c \ halt.c \
hwclock.c \ hwclock.c \

51
fsfreeze.c Normal file
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@ -0,0 +1,51 @@
/* See LICENSE file for copyright and license details. */
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/ioctl.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#include "util.h"
#define FIFREEZE _IOWR('X', 119, int /* Freeze */
#define FITHAW _IOWR('X', 120, int) /* Thaw */
static void
usage(void)
{
eprintf("usage: %s [-f] [-u] mountpoint\n", argv0);
}
int
main(int argc, char *argv[])
{
int fflag = 0;
int uflag = 0;
long p = 1;
int fd;
ARGBEGIN {
case 'f':
fflag = 1;
break;
case 'u':
uflag = 1;
break;
default:
usage();
} ARGEND;
if (argc != 1)
usage();
if ((fflag ^ uflag) == 0)
usage();
fd = open(argv[0], O_RDONLY);
if (fd < 0)
eprintf("open: %s:", argv[0]);
ioctl(fd, fflag == 1 ? FIFREEZE : FITHAW, &p);
close(fd);
return EXIT_SUCCESS;
}