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
main(void)25 int 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