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/* Check if pthread_atfork handler can call dlclose (BZ#24595).
Copyright (C) 2022-2024 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
<http://www.gnu.org/licenses/>. */
#include <stdio.h>
#include <pthread.h>
#include <unistd.h>
#include <stdlib.h>
#include <stdbool.h>
#include <support/check.h>
#include <support/xthread.h>
#include <support/capture_subprocess.h>
#include <support/xdlfcn.h>
/* Check if pthread_atfork handlers do not deadlock when calling a function
that might alter the internal fork handle list, such as dlclose.
The test registers a callback set with pthread_atfork(), dlopen() a shared
library (nptl/tst-atfork3mod.c), calls an exported symbol from the library
(which in turn also registers atfork handlers), and calls fork to trigger
the callbacks. */
static void *handler;
static bool run_dlclose_prepare;
static bool run_dlclose_parent;
static bool run_dlclose_child;
static void
prepare (void)
{
if (run_dlclose_prepare)
xdlclose (handler);
}
static void
parent (void)
{
if (run_dlclose_parent)
xdlclose (handler);
}
static void
child (void)
{
if (run_dlclose_child)
xdlclose (handler);
}
static void
proc_func (void *closure)
{
}
static void
do_test_generic (bool dlclose_prepare, bool dlclose_parent, bool dlclose_child)
{
run_dlclose_prepare = dlclose_prepare;
run_dlclose_parent = dlclose_parent;
run_dlclose_child = dlclose_child;
handler = xdlopen ("tst-atfork3mod.so", RTLD_NOW);
int (*atfork3mod_func)(void);
atfork3mod_func = xdlsym (handler, "atfork3mod_func");
atfork3mod_func ();
struct support_capture_subprocess proc
= support_capture_subprocess (proc_func, NULL);
support_capture_subprocess_check (&proc, "tst-atfork3", 0, sc_allow_none);
handler = atfork3mod_func = NULL;
support_capture_subprocess_free (&proc);
}
static void *
thread_func (void *closure)
{
return NULL;
}
static int
do_test (void)
{
{
/* Make the process acts as multithread. */
pthread_attr_t attr;
xpthread_attr_init (&attr);
xpthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED);
xpthread_create (&attr, thread_func, NULL);
}
TEST_COMPARE (pthread_atfork (prepare, parent, child), 0);
do_test_generic (true /* prepare */, false /* parent */, false /* child */);
do_test_generic (false /* prepare */, true /* parent */, false /* child */);
do_test_generic (false /* prepare */, false /* parent */, true /* child */);
return 0;
}
#include <support/test-driver.c>
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