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/* Smoke test for the gettid system call.
Copyright (C) 2019-2024 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <support/check.h>
#include <support/namespace.h>
#include <support/xthread.h>
#include <support/xunistd.h>
/* TID of the initial (main) thread. */
static pid_t initial_tid;
/* Check that PID and TID are the same in a subprocess. */
static void
subprocess (void *closure)
{
TEST_COMPARE (getpid (), gettid ());
TEST_VERIFY (gettid () != initial_tid);
}
/* Check that the TID changes in a new thread. */
static void *
threadfunc (void *closure)
{
TEST_VERIFY (getpid () != gettid ());
TEST_VERIFY (gettid () != initial_tid);
return NULL;
}
/* Check for interactions with vfork. */
static void
test_vfork (void)
{
pid_t proc = vfork ();
if (proc == 0)
{
if (getpid () != gettid ())
_exit (1);
if (gettid () == initial_tid)
_exit (2);
_exit (0);
}
int status;
xwaitpid (proc, &status, 0);
TEST_COMPARE (status, 0);
}
static int
do_test (void)
{
initial_tid = gettid ();
/* The main thread has the same TID as the PID. */
TEST_COMPARE (getpid (), gettid ());
test_vfork ();
support_isolate_in_subprocess (subprocess, NULL);
xpthread_join (xpthread_create (NULL, threadfunc, NULL));
return 0;
}
#include <support/test-driver.c>
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