libfuse: fuse-3.17.1-rc0/example/ioctl_client.c Source File

libfuse

ioctl_client.c
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1/*
2 FUSE fioclient: FUSE ioctl example client
3 Copyright (C) 2008 SUSE Linux Products GmbH
4 Copyright (C) 2008 Tejun Heo <teheo@suse.de>
5
6 This program tests the ioctl.c example file systsem.
7
8 This program can be distributed under the terms of the GNU GPLv2.
9 See the file COPYING.
10*/
11
24#include <sys/types.h>
25#include <fcntl.h>
26#include <sys/stat.h>
27#include <sys/ioctl.h>
28#include <stdio.h>
29#include <stdlib.h>
30#include <ctype.h>
31#include <errno.h>
32#include <unistd.h>
33#include "ioctl.h"
34
35const char *usage =
36"Usage: fioclient FIOC_FILE [size]\n"
37"\n"
38"Get size if <size> is omitted, set size otherwise\n"
39"\n";
40
41int main(int argc, char **argv)
42{
43 size_t size;
44 int fd;
45 int ret = 0;
46
47 if (argc < 2) {
48 fprintf(stderr, "%s", usage);
49 return 1;
50 }
51
52 fd = open(argv[1], O_RDWR);
53 if (fd < 0) {
54 perror("open");
55 return 1;
56 }
57
58 if (argc == 2) {
59 if (ioctl(fd, FIOC_GET_SIZE, &size)) {
60 perror("ioctl");
61 ret = 1;
62 goto out;
63 }
64 printf("%zu\n", size);
65 } else {
66 size = strtoul(argv[2], NULL, 0);
67 if (ioctl(fd, FIOC_SET_SIZE, &size)) {
68 perror("ioctl");
69 ret = 1;
70 goto out;
71 }
72 }
73out:
74 close(fd);
75 return ret;
76}
ioctl.h