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1d0fc213 | 1 | /* Smoke test for the gettid system call. |
581c785b | 2 | Copyright (C) 2019-2022 Free Software Foundation, Inc. |
1d0fc213 FW |
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 | |
5a82c748 | 17 | <https://www.gnu.org/licenses/>. */ |
1d0fc213 FW |
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, 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 (subprocess, NULL); | |
73 | ||
74 | xpthread_join (xpthread_create (NULL, threadfunc, NULL)); | |
75 | ||
76 | return 0; | |
77 | } | |
78 | ||
79 | #include <support/test-driver.c> |