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80 lines
2.0 KiB
C
80 lines
2.0 KiB
C
/* Smoke test for the gettid system call.
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Copyright (C) 2019-2025 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <support/check.h>
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#include <support/namespace.h>
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#include <support/xthread.h>
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#include <support/xunistd.h>
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/* TID of the initial (main) thread. */
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static pid_t initial_tid;
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/* Check that PID and TID are the same in a subprocess. */
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static void
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subprocess (void *closure)
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{
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TEST_COMPARE (getpid (), gettid ());
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TEST_VERIFY (gettid () != initial_tid);
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}
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/* Check that the TID changes in a new thread. */
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static void *
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threadfunc (void *closure)
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{
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TEST_VERIFY (getpid () != gettid ());
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TEST_VERIFY (gettid () != initial_tid);
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return NULL;
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}
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/* Check for interactions with vfork. */
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static void
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test_vfork (void)
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{
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pid_t proc = vfork ();
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if (proc == 0)
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{
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if (getpid () != gettid ())
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_exit (1);
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if (gettid () == initial_tid)
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_exit (2);
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_exit (0);
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}
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int status;
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xwaitpid (proc, &status, 0);
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TEST_COMPARE (status, 0);
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}
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static int
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do_test (void)
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{
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initial_tid = gettid ();
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/* The main thread has the same TID as the PID. */
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TEST_COMPARE (getpid (), gettid ());
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test_vfork ();
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support_isolate_in_subprocess (subprocess, NULL);
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xpthread_join (xpthread_create (NULL, threadfunc, NULL));
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return 0;
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}
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#include <support/test-driver.c>
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