Dmitry V. Levin
c6782f144a
strace test suite is now provided under the terms of the GNU General Public License version 2 or later, see tests/COPYING for more details.
41 lines
1017 B
C
41 lines
1017 B
C
/*
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* This file is part of strace test suite.
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*
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* Copyright (c) 2016 Dmitry V. Levin <ldv@altlinux.org>
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* Copyright (c) 2016-2018 The strace developers.
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* All rights reserved.
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*
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* SPDX-License-Identifier: GPL-2.0-or-later
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*/
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#include "tests.h"
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#include <assert.h>
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#include <limits.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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unsigned long
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inode_of_sockfd(const int fd)
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{
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assert(fd >= 0);
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char linkpath[sizeof("/proc/self/fd/%u") + sizeof(int) * 3];
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assert(snprintf(linkpath, sizeof(linkpath), "/proc/self/fd/%u", fd)
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< (int) sizeof(linkpath));
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char path[PATH_MAX + 1];
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const ssize_t path_len = readlink(linkpath, path, sizeof(path) - 1);
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if (path_len < 0)
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perror_msg_and_fail("readlink: %s", linkpath);
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path[path_len] = '\0';
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static const char prefix[] = "socket:[";
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const size_t prefix_len = sizeof(prefix) - 1;
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assert(strncmp(path, prefix, prefix_len) == 0
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&& path[path_len - 1] == ']');
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return strtoul(path + prefix_len, NULL, 10);
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}
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