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 /proc/thread-self gives correct TGID/PID. |
17 | #undef NDEBUG |
18 | #include <assert.h> |
19 | #include <sched.h> |
20 | #include <stdio.h> |
21 | #include <unistd.h> |
22 | #include <sys/mman.h> |
23 | #include <sys/wait.h> |
24 | |
25 | #include "proc.h" |
26 | |
27 | int f(void *arg) |
28 | { |
29 | char buf1[64], buf2[64]; |
30 | pid_t pid, tid; |
31 | ssize_t rv; |
32 | |
33 | pid = sys_getpid(); |
34 | tid = sys_gettid(); |
35 | snprintf(buf1, sizeof(buf1), "%u/task/%u" , pid, tid); |
36 | |
37 | rv = readlink("/proc/thread-self" , buf2, sizeof(buf2)); |
38 | assert(rv == strlen(buf1)); |
39 | buf2[rv] = '\0'; |
40 | assert(streq(buf1, buf2)); |
41 | |
42 | if (arg) |
43 | exit(0); |
44 | return 0; |
45 | } |
46 | |
47 | int main(void) |
48 | { |
49 | const int PAGE_SIZE = sysconf(_SC_PAGESIZE); |
50 | pid_t pid; |
51 | void *stack; |
52 | |
53 | /* main thread */ |
54 | f(arg: (void *)0); |
55 | |
56 | stack = mmap(NULL, 2 * PAGE_SIZE, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0); |
57 | assert(stack != MAP_FAILED); |
58 | /* side thread */ |
59 | pid = clone(f, stack + PAGE_SIZE, CLONE_THREAD|CLONE_SIGHAND|CLONE_VM, (void *)1); |
60 | assert(pid > 0); |
61 | pause(); |
62 | |
63 | return 0; |
64 | } |
65 | |