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tests/inode_of_sockfd.c
40 строк
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Dmitry V. Levin
Update copyright headers
16 фев 2021, 11:00
16 фев 2021, 11:00
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/* * This file is part of strace test suite. * * Copyright (c) 2016 Dmitry V. Levin <ldv@strace.io> * Copyright (c) 2016-2021 The strace developers. * All rights reserved. * * SPDX-License-Identifier: GPL-2.0-or-later */ #include "tests.h" #include <assert.h> #include <limits.h> #include <stdio.h> #include <stdlib.h> #include <string.h> #include <unistd.h> unsigned long inode_of_sockfd(const int fd) { assert(fd >= 0); char linkpath[sizeof("/proc/self/fd/%u") + sizeof(int) * 3]; assert(snprintf(linkpath, sizeof(linkpath), "/proc/self/fd/%u", fd) < (int) sizeof(linkpath)); char path[PATH_MAX + 1]; const ssize_t path_len = readlink(linkpath, path, sizeof(path) - 1); if (path_len < 0) perror_msg_and_fail("readlink: %s", linkpath); path[path_len] = '\0'; static const char prefix[] = "socket:["; const size_t prefix_len = sizeof(prefix) - 1; assert(strncmp(path, prefix, prefix_len) == 0 && path[path_len - 1] == ']'); return strtoul(path + prefix_len, NULL, 10); }