mirror of
https://sourceware.org/git/glibc.git
synced 2025-11-03 20:53:13 +03:00
129 lines
3.5 KiB
C
129 lines
3.5 KiB
C
/* pthread_atfork supports handlers that call pthread_atfork or dlclose.
|
|
Copyright (C) 2022-2025 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/xdlfcn.h>
|
|
#include <stdio.h>
|
|
#include <support/xthread.h>
|
|
#include <sys/types.h>
|
|
#include <sys/wait.h>
|
|
#include <support/xunistd.h>
|
|
#include <support/check.h>
|
|
#include <stdlib.h>
|
|
|
|
static void *
|
|
thread_func (void *x)
|
|
{
|
|
return NULL;
|
|
}
|
|
|
|
static unsigned int second_atfork_handler_runcount = 0;
|
|
|
|
static void
|
|
second_atfork_handler (void)
|
|
{
|
|
second_atfork_handler_runcount++;
|
|
}
|
|
|
|
static void *h = NULL;
|
|
|
|
static unsigned int atfork_handler_runcount = 0;
|
|
|
|
static void
|
|
prepare (void)
|
|
{
|
|
/* These atfork handlers are registered while atfork handlers are being
|
|
executed and thus will not be executed during the corresponding
|
|
fork. */
|
|
TEST_VERIFY_EXIT (pthread_atfork (second_atfork_handler,
|
|
second_atfork_handler,
|
|
second_atfork_handler) == 0);
|
|
|
|
/* This will de-register the atfork handlers registered by the dlopen'd
|
|
library and so they will not be executed. */
|
|
if (h != NULL)
|
|
{
|
|
xdlclose (h);
|
|
h = NULL;
|
|
}
|
|
|
|
atfork_handler_runcount++;
|
|
}
|
|
|
|
static void
|
|
after (void)
|
|
{
|
|
atfork_handler_runcount++;
|
|
}
|
|
|
|
static int
|
|
do_test (void)
|
|
{
|
|
/* Make sure __libc_single_threaded is 0. */
|
|
pthread_attr_t attr;
|
|
xpthread_attr_init (&attr);
|
|
xpthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED);
|
|
xpthread_create (&attr, thread_func, NULL);
|
|
|
|
void (*reg_atfork_handlers) (void);
|
|
|
|
h = xdlopen ("tst-atfork4mod.so", RTLD_LAZY);
|
|
|
|
reg_atfork_handlers = xdlsym (h, "reg_atfork_handlers");
|
|
|
|
reg_atfork_handlers ();
|
|
|
|
/* We register our atfork handlers *after* loading the module so that our
|
|
prepare handler is called first at fork, where we then dlclose the
|
|
module before its prepare handler has a chance to be called. */
|
|
TEST_VERIFY_EXIT (pthread_atfork (prepare, after, after) == 0);
|
|
|
|
pid_t pid = xfork ();
|
|
|
|
/* Both the parent and the child processes should observe this. */
|
|
TEST_VERIFY_EXIT (atfork_handler_runcount == 2);
|
|
TEST_VERIFY_EXIT (second_atfork_handler_runcount == 0);
|
|
|
|
if (pid > 0)
|
|
{
|
|
int childstat;
|
|
|
|
xwaitpid (-1, &childstat, 0);
|
|
TEST_VERIFY_EXIT (WIFEXITED (childstat)
|
|
&& WEXITSTATUS (childstat) == 0);
|
|
|
|
/* This time, the second set of atfork handlers should also be called
|
|
since the handlers are already in place before fork is called. */
|
|
|
|
pid = xfork ();
|
|
|
|
TEST_VERIFY_EXIT (atfork_handler_runcount == 4);
|
|
TEST_VERIFY_EXIT (second_atfork_handler_runcount == 2);
|
|
|
|
if (pid > 0)
|
|
{
|
|
xwaitpid (-1, &childstat, 0);
|
|
TEST_VERIFY_EXIT (WIFEXITED (childstat)
|
|
&& WEXITSTATUS (childstat) == 0);
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
#include <support/test-driver.c>
|