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1/*2 * Copyright © 2018 Alexey Dobriyan <adobriyan@gmail.com>3 *4 * Permission to use, copy, modify, and distribute this software for any5 * purpose with or without fee is hereby granted, provided that the above6 * copyright notice and this permission notice appear in all copies.7 *8 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES9 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF10 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR11 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES12 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN13 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF14 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.15 */16// Test that open(/proc/*/fd/*) opens the same file.17#undef NDEBUG18#include <assert.h>19#include <stdio.h>20#include <sys/types.h>21#include <sys/stat.h>22#include <fcntl.h>23#include <unistd.h>24 25int main(void)26{27 int fd0, fd1, fd2;28 struct stat st0, st1, st2;29 char buf[64];30 int rv;31 32 fd0 = open("/", O_DIRECTORY|O_RDONLY);33 assert(fd0 >= 0);34 35 snprintf(buf, sizeof(buf), "/proc/self/fd/%u", fd0);36 fd1 = open(buf, O_RDONLY);37 assert(fd1 >= 0);38 39 snprintf(buf, sizeof(buf), "/proc/thread-self/fd/%u", fd0);40 fd2 = open(buf, O_RDONLY);41 assert(fd2 >= 0);42 43 rv = fstat(fd0, &st0);44 assert(rv == 0);45 rv = fstat(fd1, &st1);46 assert(rv == 0);47 rv = fstat(fd2, &st2);48 assert(rv == 0);49 50 assert(st0.st_dev == st1.st_dev);51 assert(st0.st_ino == st1.st_ino);52 53 assert(st0.st_dev == st2.st_dev);54 assert(st0.st_ino == st2.st_ino);55 56 return 0;57}58