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Serenity Operating System
1/*
2 * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are met:
7 *
8 * 1. Redistributions of source code must retain the above copyright notice, this
9 * list of conditions and the following disclaimer.
10 *
11 * 2. Redistributions in binary form must reproduce the above copyright notice,
12 * this list of conditions and the following disclaimer in the documentation
13 * and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
16 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
18 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
21 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
22 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
23 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
24 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27#include <errno.h>
28#include <fcntl.h>
29#include <stdio.h>
30#include <stdlib.h>
31#include <sys/stat.h>
32#include <sys/types.h>
33#include <unistd.h>
34#include <utime.h>
35
36static bool file_exists(const char* path)
37{
38 struct stat st;
39 int rc = stat(path, &st);
40 if (rc < 0) {
41 if (errno == ENOENT)
42 return false;
43 }
44 if (rc == 0) {
45 return true;
46 }
47 perror("stat");
48 exit(1);
49}
50
51int main(int argc, char** argv)
52{
53 if (pledge("stdio rpath cpath fattr", nullptr)) {
54 perror("pledge");
55 return 1;
56 }
57
58 if (argc != 2) {
59 fprintf(stderr, "usage: touch <path>\n");
60 return 1;
61 }
62 if (file_exists(argv[1])) {
63 int rc = utime(argv[1], nullptr);
64 if (rc < 0)
65 perror("utime");
66 } else {
67 int fd = open(argv[1], O_CREAT, 0100644);
68 if (fd < 0) {
69 perror("open");
70 return 1;
71 }
72 int rc = close(fd);
73 if (rc < 0) {
74 perror("close");
75 return 1;
76 }
77 }
78 return 0;
79}