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/* Test case for forgotten hw-watchpoints after fork()-off of a process.
Copyright 2012-2024 Free Software Foundation, Inc.
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, see <http://www.gnu.org/licenses/>. */
#include "watchpoint-fork.h"
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include <assert.h>
#include <signal.h>
#include <stdio.h>
/* `pid_t' may not be available. */
static volatile int usr1_got;
static void
handler_usr1 (int signo)
{
usr1_got++;
}
void
forkoff (int nr)
{
int child, save_parent = getpid ();
int i;
struct sigaction act, oldact;
#ifdef THREAD
void *thread_result;
#endif
memset (&act, 0, sizeof act);
act.sa_flags = SA_RESTART;
act.sa_handler = handler_usr1;
sigemptyset (&act.sa_mask);
i = sigaction (SIGUSR1, &act, &oldact);
assert (i == 0);
child = fork ();
switch (child)
{
case -1:
assert (0);
default:
#if DEBUG
printf ("parent%d: %d\n", nr, (int) child);
#endif
/* Sleep for a while to possibly get incorrectly ATTACH_THREADed by GDB
tracing the child fork with no longer valid thread/lwp entries of the
parent. */
i = sleep (2);
assert (i == 0);
/* We must not get caught here (against a forgotten breakpoint). */
var++;
marker ();
#ifdef THREAD
/* And neither got caught our thread. */
step = 99;
i = pthread_join (thread, &thread_result);
assert (i == 0);
assert (thread_result == (void *) 99UL);
#endif
/* Be sure our child knows we did not get caught above. */
i = kill (child, SIGUSR1);
assert (i == 0);
/* Sleep for a while to check GDB's `info threads' no longer tracks us in
the child fork. */
i = sleep (2);
assert (i == 0);
_exit (0);
case 0:
#if DEBUG
printf ("child%d: %d\n", nr, (int) getpid ());
#endif
/* Let the parent signal us about its success. Be careful of races. */
for (;;)
{
/* Parent either died (and USR1_GOT is zero) or it succeeded. */
if (getppid () != save_parent)
break;
if (kill (getppid (), 0) != 0)
break;
/* Parent succeeded? */
if (usr1_got)
break;
#ifdef THREAD
i = pthread_yield ();
assert (i == 0);
#endif
}
assert (usr1_got);
/* We must get caught here (against a false watchpoint removal). */
marker ();
}
i = sigaction (SIGUSR1, &oldact, NULL);
assert (i == 0);
}
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