1/*
2 * Copyright (c) 2015 Gleb Fotengauer-Malinovskiy <glebfm@altlinux.org>
3 * Copyright (c) 2015-2016 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#include "tests.h"
30#include <asm/unistd.h>
31
32#ifdef __NR_readlink
33
34# include <stdio.h>
35# include <unistd.h>
36
37# define PREFIX "test.readlink"
38# define TARGET (PREFIX ".target")
39# define LINKPATH (PREFIX ".link")
40
41int
42main(void)
43{
44	const char * const fname = tail_memdup(LINKPATH, sizeof(LINKPATH));
45	const char * const hex_fname =
46		hexquote_strndup(fname, sizeof(LINKPATH) - 1);
47
48	const unsigned int size = sizeof(TARGET) - 1;
49	char * const buf = tail_alloc(size);
50
51	(void) unlink(fname);
52
53	long rc = syscall(__NR_readlink, fname, buf, size);
54	printf("readlink(\"%s\", %p, %u) = -1 ENOENT (%m)\n",
55	       hex_fname, buf, size);
56
57	if (symlink(TARGET, fname))
58		perror_msg_and_fail("symlink");
59
60	rc = syscall(__NR_readlink, fname, buf, size);
61	if (rc < 0) {
62		perror("readlink");
63		(void) unlink(fname);
64		return 77;
65	}
66	const char * const hex_buf = hexquote_strndup(buf, size);
67	printf("readlink(\"%s\", \"%s\", %u) = %u\n",
68	       hex_fname, hex_buf, size, size);
69
70	if (unlink(fname))
71		perror_msg_and_fail("unlink");
72
73	puts("+++ exited with 0 +++");
74	return 0;
75}
76
77#else
78
79SKIP_MAIN_UNDEFINED("__NR_readlink")
80
81#endif
82