1 /*
2 * This file is part of strace test suite.
3 *
4 * Copyright (c) 2016 Dmitry V. Levin <ldv@altlinux.org>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. The name of the author may not be used to endorse or promote products
16 * derived from this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 */
29
30 #include "tests.h"
31 #include <assert.h>
32 #include <stdio.h>
33 #include <stdlib.h>
34 #include <string.h>
35 #include <unistd.h>
36 #include <sys/param.h>
37
38 unsigned long
inode_of_sockfd(const int fd)39 inode_of_sockfd(const int fd)
40 {
41 assert(fd >= 0);
42
43 char linkpath[sizeof("/proc/self/fd/%u") + sizeof(int) * 3];
44 assert(snprintf(linkpath, sizeof(linkpath), "/proc/self/fd/%u", fd)
45 < (int) sizeof(linkpath));
46
47 char path[PATH_MAX + 1];
48 const ssize_t path_len = readlink(linkpath, path, sizeof(path) - 1);
49 if (path_len < 0)
50 perror_msg_and_fail("readlink: %s", linkpath);
51 path[path_len] = '\0';
52
53 static const char prefix[] = "socket:[";
54 const size_t prefix_len = sizeof(prefix) - 1;
55 assert(strncmp(path, prefix, prefix_len) == 0
56 && path[path_len - 1] == ']');
57
58 return strtoul(path + prefix_len, NULL, 10);
59 }
60