1 | /* Smoke test for the gettid system call. |
2 | Copyright (C) 2019-2022 Free Software Foundation, Inc. |
3 | This file is part of the GNU C Library. |
4 | |
5 | The GNU C Library is free software; you can redistribute it and/or |
6 | modify it under the terms of the GNU Lesser General Public |
7 | License as published by the Free Software Foundation; either |
8 | version 2.1 of the License, or (at your option) any later version. |
9 | |
10 | The GNU C Library is distributed in the hope that it will be useful, |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
13 | Lesser General Public License for more details. |
14 | |
15 | You should have received a copy of the GNU Lesser General Public |
16 | License along with the GNU C Library; if not, see |
17 | <https://www.gnu.org/licenses/>. */ |
18 | |
19 | #include <support/check.h> |
20 | #include <support/namespace.h> |
21 | #include <support/xthread.h> |
22 | #include <support/xunistd.h> |
23 | |
24 | /* TID of the initial (main) thread. */ |
25 | static pid_t initial_tid; |
26 | |
27 | /* Check that PID and TID are the same in a subprocess. */ |
28 | static void |
29 | subprocess (void *closure) |
30 | { |
31 | TEST_COMPARE (getpid (), gettid ()); |
32 | TEST_VERIFY (gettid () != initial_tid); |
33 | } |
34 | |
35 | /* Check that the TID changes in a new thread. */ |
36 | static void * |
37 | threadfunc (void *closure) |
38 | { |
39 | TEST_VERIFY (getpid () != gettid ()); |
40 | TEST_VERIFY (gettid () != initial_tid); |
41 | return NULL; |
42 | } |
43 | |
44 | /* Check for interactions with vfork. */ |
45 | static void |
46 | test_vfork (void) |
47 | { |
48 | pid_t proc = vfork (); |
49 | if (proc == 0) |
50 | { |
51 | if (getpid () != gettid ()) |
52 | _exit (1); |
53 | if (gettid () == initial_tid) |
54 | _exit (2); |
55 | _exit (0); |
56 | } |
57 | int status; |
58 | xwaitpid (proc, status: &status, flags: 0); |
59 | TEST_COMPARE (status, 0); |
60 | } |
61 | |
62 | static int |
63 | do_test (void) |
64 | { |
65 | initial_tid = gettid (); |
66 | |
67 | /* The main thread has the same TID as the PID. */ |
68 | TEST_COMPARE (getpid (), gettid ()); |
69 | |
70 | test_vfork (); |
71 | |
72 | support_isolate_in_subprocess (callback: subprocess, NULL); |
73 | |
74 | xpthread_join (thr: xpthread_create (NULL, thread_func: threadfunc, NULL)); |
75 | |
76 | return 0; |
77 | } |
78 | |
79 | #include <support/test-driver.c> |
80 | |