1 /*
2 * Copyright (c) 2015 Gleb Fotengauer-Malinovskiy <glebfm@altlinux.org>
3 * Copyright (c) 2015 Dmitry V. Levin <ldv@altlinux.org>
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * 3. The name of the author may not be used to endorse or promote products
15 * derived from this software without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29 #ifdef HAVE_CONFIG_H
30 # include "config.h"
31 #endif
32
33 #include <stdio.h>
34 #include <unistd.h>
35 #include <sys/syscall.h>
36
37 int
main(void)38 main(void)
39 {
40 #ifdef __NR_readlinkat
41 static const char fname[] = "readlinkat.link";
42 unsigned char buf[31];
43 long rc;
44 unsigned int i;
45
46 rc = syscall(__NR_readlinkat, -100, fname, buf, sizeof(buf));
47 if (rc < 0)
48 return 77;
49
50 printf("readlinkat(AT_FDCWD, \"");
51 for (i = 0; fname[i]; ++i)
52 printf("\\x%02x", (int) (unsigned char) fname[i]);
53 printf("\", \"");
54 for (i = 0; i < 3; ++i)
55 printf("\\x%02x", (int) buf[i]);
56 printf("\"..., %zu) = %ld\n", sizeof(buf), rc);
57
58 puts("+++ exited with 0 +++");
59 return 0;
60 #else
61 return 77;
62 #endif
63 }
64