1 /* 2 * This file is part of strace test suite. 3 * 4 * Copyright (c) 2016 Dmitry V. Levin <ldv@altlinux.org> 5 * Copyright (c) 2016-2018 The strace developers. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. The name of the author may not be used to endorse or promote products 17 * derived from this software without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 20 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 21 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 22 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 23 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 24 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 28 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29 */ 30 31 #include "tests.h" 32 #include <assert.h> 33 #include <limits.h> 34 #include <stdio.h> 35 #include <stdlib.h> 36 #include <string.h> 37 #include <unistd.h> 38 39 unsigned long 40 inode_of_sockfd(const int fd) 41 { 42 assert(fd >= 0); 43 44 char linkpath[sizeof("/proc/self/fd/%u") + sizeof(int) * 3]; 45 assert(snprintf(linkpath, sizeof(linkpath), "/proc/self/fd/%u", fd) 46 < (int) sizeof(linkpath)); 47 48 char path[PATH_MAX + 1]; 49 const ssize_t path_len = readlink(linkpath, path, sizeof(path) - 1); 50 if (path_len < 0) 51 perror_msg_and_fail("readlink: %s", linkpath); 52 path[path_len] = '\0'; 53 54 static const char prefix[] = "socket:["; 55 const size_t prefix_len = sizeof(prefix) - 1; 56 assert(strncmp(path, prefix, prefix_len) == 0 57 && path[path_len - 1] == ']'); 58 59 return strtoul(path + prefix_len, NULL, 10); 60 } 61