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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 <AK/Vector.h>
28#include <assert.h>
29#include <errno.h>
30#include <fcntl.h>
31#include <stdio.h>
32#include <stdlib.h>
33#include <string.h>
34#include <unistd.h>
35
36int main(int argc, char** argv)
37{
38 if (pledge("stdio rpath", nullptr) < 0) {
39 perror("pledge");
40 return 1;
41 }
42
43 Vector<int> fds;
44 if (argc > 1) {
45 for (int i = 1; i < argc; i++) {
46 int fd;
47 if ((fd = open(argv[i], O_RDONLY)) == -1) {
48 fprintf(stderr, "Failed to open %s: %s\n", argv[i], strerror(errno));
49 continue;
50 }
51 fds.append(fd);
52 }
53 } else {
54 fds.append(0);
55 }
56
57 if (pledge("stdio", nullptr) < 0) {
58 perror("pledge");
59 return 1;
60 }
61
62 for (auto& fd : fds) {
63 for (;;) {
64 char buf[32768];
65 ssize_t nread = read(fd, buf, sizeof(buf));
66 if (nread == 0)
67 break;
68 if (nread < 0) {
69 perror("read");
70 return 2;
71 }
72 ssize_t nwritten = write(1, buf, nread);
73 if (nwritten < 0) {
74 perror("write");
75 return 3;
76 }
77 ASSERT(nwritten == nread);
78 }
79 close(fd);
80 }
81 return 0;
82}