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 | |
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 | |