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129 lines
3.5 KiB
C
129 lines
3.5 KiB
C
/* pthread_atfork supports handlers that call pthread_atfork or dlclose.
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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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<https://www.gnu.org/licenses/>. */
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#include <support/xdlfcn.h>
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#include <stdio.h>
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#include <support/xthread.h>
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#include <sys/types.h>
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#include <sys/wait.h>
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#include <support/xunistd.h>
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#include <support/check.h>
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#include <stdlib.h>
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static void *
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thread_func (void *x)
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{
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return NULL;
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}
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static unsigned int second_atfork_handler_runcount = 0;
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static void
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second_atfork_handler (void)
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{
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second_atfork_handler_runcount++;
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}
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static void *h = NULL;
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static unsigned int atfork_handler_runcount = 0;
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static void
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prepare (void)
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{
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/* These atfork handlers are registered while atfork handlers are being
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executed and thus will not be executed during the corresponding
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fork. */
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TEST_VERIFY_EXIT (pthread_atfork (second_atfork_handler,
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second_atfork_handler,
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second_atfork_handler) == 0);
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/* This will de-register the atfork handlers registered by the dlopen'd
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library and so they will not be executed. */
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if (h != NULL)
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{
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xdlclose (h);
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h = NULL;
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}
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atfork_handler_runcount++;
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}
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static void
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after (void)
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{
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atfork_handler_runcount++;
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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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/* Make sure __libc_single_threaded is 0. */
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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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void (*reg_atfork_handlers) (void);
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h = xdlopen ("tst-atfork4mod.so", RTLD_LAZY);
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reg_atfork_handlers = xdlsym (h, "reg_atfork_handlers");
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reg_atfork_handlers ();
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/* We register our atfork handlers *after* loading the module so that our
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prepare handler is called first at fork, where we then dlclose the
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module before its prepare handler has a chance to be called. */
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TEST_VERIFY_EXIT (pthread_atfork (prepare, after, after) == 0);
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pid_t pid = xfork ();
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/* Both the parent and the child processes should observe this. */
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TEST_VERIFY_EXIT (atfork_handler_runcount == 2);
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TEST_VERIFY_EXIT (second_atfork_handler_runcount == 0);
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if (pid > 0)
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{
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int childstat;
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xwaitpid (-1, &childstat, 0);
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TEST_VERIFY_EXIT (WIFEXITED (childstat)
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&& WEXITSTATUS (childstat) == 0);
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/* This time, the second set of atfork handlers should also be called
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since the handlers are already in place before fork is called. */
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pid = xfork ();
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TEST_VERIFY_EXIT (atfork_handler_runcount == 4);
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TEST_VERIFY_EXIT (second_atfork_handler_runcount == 2);
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if (pid > 0)
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{
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xwaitpid (-1, &childstat, 0);
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TEST_VERIFY_EXIT (WIFEXITED (childstat)
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&& WEXITSTATUS (childstat) == 0);
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}
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}
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return 0;
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}
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#include <support/test-driver.c>
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