ioctl_client.c

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/*
  FUSE fioclient: FUSE ioctl example client
  Copyright (C) 2008       SUSE Linux Products GmbH
  Copyright (C) 2008       Tejun Heo <teheo@suse.de>
 
  This program can be distributed under the terms of the GNU GPLv2.
  See the file GPL2.txt.
*/
 
#include <sys/types.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#include <errno.h>
#include <unistd.h>
#include "ioctl.h"
 
const char *usage =
"Usage: fioclient FIOC_FILE [size]\n"
"\n"
"Get size if <size> is omitted, set size otherwise\n"
"\n";
 
int main(int argc, char **argv)
{
        size_t size;
        int fd;
        int ret = 0;
 
        if (argc < 2) {
                fprintf(stderr, "%s", usage);
                return 1;
        }
 
        fd = open(argv[1], O_RDWR);
        if (fd < 0) {
                perror("open");
                return 1;
        }
 
        if (argc == 2) {
                if (ioctl(fd, FIOC_GET_SIZE, &size)) {
                        perror("ioctl");
                        ret = 1;
                        goto out;
                }
                printf("%zu\n", size);
        } else {
                size = strtoul(argv[2], NULL, 0);
                if (ioctl(fd, FIOC_SET_SIZE, &size)) {
                        perror("ioctl");
                        ret = 1;
                        goto out;
                }
        }
out:
        close(fd);
        return ret;
}