ubase/fsfreeze.c

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/* See LICENSE file for copyright and license details. */
#include <sys/ioctl.h>
#include <sys/stat.h>
#include <sys/types.h>
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#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
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#include <unistd.h>
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#include "util.h"
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#define FIFREEZE _IOWR('X', 119, int) /* Freeze */
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#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]);
if (ioctl(fd, fflag == 1 ? FIFREEZE : FITHAW, &p) < 0)
eprintf("%s %s:", fflag == 1 ? "FIFREEZE" : "FITHAW", argv[0]);
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close(fd);
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return 0;
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}