ubase/fsfreeze.c
Mattias Andrée 28795cffe2 fsfreeze: make it clear the either -f or -u must be specified, not optional
Signed-off-by: Mattias Andrée <maandree@kth.se>
2016-03-26 19:08:10 +00:00

55 lines
899 B
C

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