1 /* 2 * This file is part of strace test suite. 3 * 4 * Copyright (c) 2016 Dmitry V. Levin <ldv (at) 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 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
