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119 lines
3.1 KiB
C
119 lines
3.1 KiB
C
/* Check if pthread_atfork handler can call dlclose (BZ#24595).
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Copyright (C) 2022-2025 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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<http://www.gnu.org/licenses/>. */
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#include <stdio.h>
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#include <pthread.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <stdbool.h>
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#include <support/check.h>
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#include <support/xthread.h>
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#include <support/capture_subprocess.h>
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#include <support/xdlfcn.h>
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/* Check if pthread_atfork handlers do not deadlock when calling a function
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that might alter the internal fork handle list, such as dlclose.
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The test registers a callback set with pthread_atfork(), dlopen() a shared
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library (nptl/tst-atfork3mod.c), calls an exported symbol from the library
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(which in turn also registers atfork handlers), and calls fork to trigger
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the callbacks. */
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static void *handler;
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static bool run_dlclose_prepare;
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static bool run_dlclose_parent;
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static bool run_dlclose_child;
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static void
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prepare (void)
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{
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if (run_dlclose_prepare)
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xdlclose (handler);
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}
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static void
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parent (void)
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{
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if (run_dlclose_parent)
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xdlclose (handler);
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}
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static void
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child (void)
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{
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if (run_dlclose_child)
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xdlclose (handler);
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}
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static void
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proc_func (void *closure)
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{
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}
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static void
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do_test_generic (bool dlclose_prepare, bool dlclose_parent, bool dlclose_child)
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{
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run_dlclose_prepare = dlclose_prepare;
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run_dlclose_parent = dlclose_parent;
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run_dlclose_child = dlclose_child;
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handler = xdlopen ("tst-atfork3mod.so", RTLD_NOW);
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int (*atfork3mod_func)(void);
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atfork3mod_func = xdlsym (handler, "atfork3mod_func");
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atfork3mod_func ();
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struct support_capture_subprocess proc
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= support_capture_subprocess (proc_func, NULL);
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support_capture_subprocess_check (&proc, "tst-atfork3", 0, sc_allow_none);
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handler = atfork3mod_func = NULL;
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support_capture_subprocess_free (&proc);
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}
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static void *
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thread_func (void *closure)
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{
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return NULL;
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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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{
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/* Make the process acts as multithread. */
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pthread_attr_t attr;
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xpthread_attr_init (&attr);
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xpthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED);
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xpthread_create (&attr, thread_func, NULL);
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}
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TEST_COMPARE (pthread_atfork (prepare, parent, child), 0);
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do_test_generic (true /* prepare */, false /* parent */, false /* child */);
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do_test_generic (false /* prepare */, true /* parent */, false /* child */);
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do_test_generic (false /* prepare */, false /* parent */, true /* child */);
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return 0;
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}
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#include <support/test-driver.c>
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