| /* Test case for forgotten hw-watchpoints after fork()-off of a process. |
| |
| Copyright 2012-2018 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: |
| printf ("parent%d: %d\n", nr, (int) child); |
| |
| /* 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| tracing the child fork with no longer valid thread/lwp entries of the |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: |
| printf ("child%d: %d\n", nr, (int) getpid ()); |
| |
| /* 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); |
| } |