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/* Test case for forgotten hw-watchpoints after fork()-off of a process.
Copyright 2012-2019 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 <assert.h>
#include <unistd.h>
#include <sys/wait.h>
#include <stdio.h>
#include <stdlib.h>
#include <pthread.h>
#include <asm/unistd.h>
#include <unistd.h>
#define gettid() syscall (__NR_gettid)
/* Non-atomic `var++' should not hurt as we synchronize the threads by the STEP
variable. Hit-comments need to be duplicated there to catch both at-stops
and behind-stops, depending on the target. */
volatile int var;
void
marker (void)
{
}
static void
empty (void)
{
}
static void
mark_exit (void)
{
}
pthread_t thread;
volatile int step;
static void *
start (void *arg)
{
int i;
if (step >= 3)
goto step_3;
while (step != 1)
{
i = pthread_yield ();
assert (i == 0);
}
var++; /* validity-thread-B */
empty (); /* validity-thread-B */
step = 2;
while (step != 3)
{
if (step == 99)
goto step_99;
i = pthread_yield ();
assert (i == 0);
}
step_3:
if (step >= 5)
goto step_5;
var++; /* after-fork1-B */
empty (); /* after-fork1-B */
step = 4;
while (step != 5)
{
if (step == 99)
goto step_99;
i = pthread_yield ();
assert (i == 0);
}
step_5:
var++; /* after-fork2-B */
empty (); /* after-fork2-B */
return (void *) 5UL;
step_99:
/* We must not get caught here (against a forgotten breakpoint). */
var++;
marker ();
return (void *) 99UL;
}
int
main (void)
{
int i;
void *thread_result;
setbuf (stdout, NULL);
printf ("main: %d\n", (int) gettid ());
/* General hardware breakpoints and watchpoints validity. */
marker ();
var++; /* validity-first */
empty (); /* validity-first */
i = pthread_create (&thread, NULL, start, NULL);
assert (i == 0);
var++; /* validity-thread-A */
empty (); /* validity-thread-A */
step = 1;
while (step != 2)
{
i = pthread_yield ();
assert (i == 0);
}
/* Hardware watchpoints got disarmed here. */
forkoff (1);
var++; /* after-fork1-A */
empty (); /* after-fork1-A */
step = 3;
#ifdef FOLLOW_CHILD
/* Spawn new thread as it was deleted in the child of FORK. */
i = pthread_create (&thread, NULL, start, NULL);
assert (i == 0);
#endif
while (step != 4)
{
i = pthread_yield ();
assert (i == 0);
}
/* A sanity check for double hardware watchpoints removal. */
forkoff (2);
var++; /* after-fork2-A */
empty (); /* after-fork2-A */
step = 5;
#ifdef FOLLOW_CHILD
/* Spawn new thread as it was deleted in the child of FORK. */
i = pthread_create (&thread, NULL, start, NULL);
assert (i == 0);
#endif
i = pthread_join (thread, &thread_result);
assert (i == 0);
assert (thread_result == (void *) 5UL);
mark_exit ();
return 0;
}
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