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128 lines
2.9 KiB
C
128 lines
2.9 KiB
C
/* Test case for forgotten hw-watchpoints after fork()-off of a process.
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Copyright 2012-2014 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program 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
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, see <http://www.gnu.org/licenses/>. */
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#include <string.h>
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#include <errno.h>
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#include <unistd.h>
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#include <assert.h>
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#include <signal.h>
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#include <stdio.h>
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#include "watchpoint-fork.h"
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/* `pid_t' may not be available. */
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static volatile int usr1_got;
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static void
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handler_usr1 (int signo)
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{
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usr1_got++;
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}
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void
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forkoff (int nr)
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{
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int child, save_parent = getpid ();
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int i;
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struct sigaction act, oldact;
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#ifdef THREAD
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void *thread_result;
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#endif
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memset (&act, 0, sizeof act);
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act.sa_flags = SA_RESTART;
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act.sa_handler = handler_usr1;
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sigemptyset (&act.sa_mask);
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i = sigaction (SIGUSR1, &act, &oldact);
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assert (i == 0);
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child = fork ();
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switch (child)
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{
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case -1:
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assert (0);
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default:
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printf ("parent%d: %d\n", nr, (int) child);
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/* Sleep for a while to possibly get incorrectly ATTACH_THREADed by GDB
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tracing the child fork with no longer valid thread/lwp entries of the
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parent. */
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i = sleep (2);
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assert (i == 0);
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/* We must not get caught here (against a forgotten breakpoint). */
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var++;
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marker ();
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#ifdef THREAD
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/* And neither got caught our thread. */
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step = 99;
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i = pthread_join (thread, &thread_result);
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assert (i == 0);
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assert (thread_result == (void *) 99UL);
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#endif
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/* Be sure our child knows we did not get caught above. */
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i = kill (child, SIGUSR1);
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assert (i == 0);
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/* Sleep for a while to check GDB's `info threads' no longer tracks us in
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the child fork. */
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i = sleep (2);
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assert (i == 0);
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_exit (0);
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case 0:
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printf ("child%d: %d\n", nr, (int) getpid ());
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/* Let the parent signal us about its success. Be careful of races. */
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for (;;)
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{
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/* Parent either died (and USR1_GOT is zero) or it succeeded. */
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if (getppid () != save_parent)
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break;
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if (kill (getppid (), 0) != 0)
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break;
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/* Parent succeeded? */
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if (usr1_got)
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break;
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#ifdef THREAD
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i = pthread_yield ();
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assert (i == 0);
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#endif
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}
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assert (usr1_got);
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/* We must get caught here (against a false watchpoint removal). */
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marker ();
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}
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i = sigaction (SIGUSR1, &oldact, NULL);
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assert (i == 0);
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}
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