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/* Copyright (C) 2003-2025 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 <dlfcn.h>
#include <errno.h>
#include <mcheck.h>
#include <pthread.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/wait.h>
/* Must be exported. */
int val;
static void
prepare (void)
{
val *= 2;
}
static void
parent (void)
{
val += 4;
}
static void
child (void)
{
val += 8;
}
static int
do_test (void)
{
mtrace ();
if (pthread_atfork (prepare, parent, child) != 0)
{
puts ("do_test: atfork failed");
exit (1);
}
void *h = dlopen ("tst-atfork2mod.so", RTLD_LAZY);
if (h == NULL)
{
printf ("dlopen failed: %s\n", dlerror ());
exit (1);
}
/* First trial of fork. */
pid_t pid = fork ();
if (pid == -1)
{
puts ("1st fork failed");
exit (1);
}
if (pid == 0)
{
/* Child. */
if (val != 80)
{
printf ("1st: expected val=%d, got %d\n", 80, val);
exit (2);
}
exit (0);
}
/* Parent. */
if (val != 24)
{
printf ("1st: expected val=%d, got %d\n", 24, val);
exit (1);
}
int status;
if (TEMP_FAILURE_RETRY (waitpid (pid, &status, 0)) != pid)
{
puts ("1st waitpid failed");
exit (1);
}
if (status != 0)
exit (status);
puts ("unloading now");
/* Unload the module. */
if (dlclose (h) != 0)
{
puts ("dlclose failed");
exit (1);
}
puts ("2nd fork");
/* Second fork trial. */
val = 1;
pid = fork ();
if (pid == -1)
{
puts ("2nd fork failed");
exit (1);
}
if (pid == 0)
{
/* Child. */
if (val != 10)
{
printf ("2nd: expected val=%d, got %d\n", 10, val);
exit (3);
}
exit (0);
}
/* Parent. */
if (val != 6)
{
printf ("2nd: expected val=%d, got %d\n", 6, val);
exit (1);
}
if (TEMP_FAILURE_RETRY (waitpid (pid, &status, 0)) != pid)
{
puts ("2nd waitpid failed");
exit (1);
}
if (status != 0)
exit (status);
return 0;
}
#define TEST_FUNCTION do_test ()
#include "../test-skeleton.c"
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