/* * Copyright © 2018 Alexey Dobriyan <adobriyan@gmail.com> * * Permission to use, copy, modify, and distribute this software for any * purpose with or without fee is hereby granted, provided that the above * copyright notice and this permission notice appear in all copies. * * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */ // Test that open(/proc/*/fd/*) opens the same file. #undef NDEBUG #include <assert.h> #include <stdio.h> #include <sys/types.h> #include <sys/stat.h> #include <fcntl.h> #include <unistd.h> int main(void) { int fd0, fd1, fd2; struct stat st0, st1, st2; char buf[64]; int rv; fd0 = open("/", O_DIRECTORY|O_RDONLY); assert(fd0 >= 0); snprintf(buf, sizeof(buf), "/proc/self/fd/%u", fd0); fd1 = open(buf, O_RDONLY); assert(fd1 >= 0); snprintf(buf, sizeof(buf), "/proc/thread-self/fd/%u", fd0); fd2 = open(buf, O_RDONLY); assert(fd2 >= 0); rv = fstat(fd0, &st0); assert(rv == 0); rv = fstat(fd1, &st1); assert(rv == 0); rv = fstat(fd2, &st2); assert(rv == 0); assert(st0.st_dev == st1.st_dev); assert(st0.st_ino == st1.st_ino); assert(st0.st_dev == st2.st_dev); assert(st0.st_ino == st2.st_ino); return 0; }