fd-002-posix-eq.c (1629B)
1/* 2 * Copyright © 2018 Alexey Dobriyan <adobriyan@gmail.com> 3 * 4 * Permission to use, copy, modify, and distribute this software for any 5 * purpose with or without fee is hereby granted, provided that the above 6 * copyright notice and this permission notice appear in all copies. 7 * 8 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 9 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 10 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 11 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 12 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 13 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 14 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 15 */ 16// Test that open(/proc/*/fd/*) opens the same file. 17#undef NDEBUG 18#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}