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d01e823438
This updates the copyright headers to include 2025. I did this by running gdb/copyright.py and then manually modifying a few files as noted by the script. Approved-By: Eli Zaretskii <eliz@gnu.org>
106 lines
2.4 KiB
C
106 lines
2.4 KiB
C
/* This testcase is part of GDB, the GNU debugger.
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Copyright 2023-2025 Free Software Foundation, Inc.
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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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#define _GNU_SOURCE
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#include <assert.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <sys/ptrace.h>
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#include <pthread.h>
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#include <stdlib.h>
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#include <errno.h>
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int fds[2];
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_Atomic pid_t bg_tid = 0;
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pthread_barrier_t barrier;
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#define FIVE_MINUTES (5 * 60)
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/* One thread of the child process. This is traced by the parent
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process. */
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void *
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block (void *ignore)
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{
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bg_tid = gettid ();
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pthread_barrier_wait (&barrier);
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sleep (FIVE_MINUTES);
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return 0;
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}
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/* The parent process blocks in this function. */
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void
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parent_stop (pid_t child_thread_pid)
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{
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sleep (FIVE_MINUTES);
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}
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int
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main ()
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{
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int result;
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pthread_barrier_init (&barrier, NULL, 2);
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result = pipe (fds);
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assert (result != -1);
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pid_t child = fork ();
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if (child != 0)
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{
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/* Parent. */
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close (fds[1]);
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pid_t the_tid;
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result = read (fds[0], &the_tid, sizeof (the_tid));
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assert (result == sizeof (the_tid));
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/* Trace a single, non-main thread of the child. This should
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prevent gdb from attaching to the child at all. The bug here
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was that gdb would get into an infinite loop repeatedly
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trying to attach to this thread. */
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result = ptrace (PTRACE_SEIZE, the_tid, (void *) 0, (void *) 0);
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if (result == -1)
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perror ("ptrace");
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parent_stop (child);
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}
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else
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{
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/* Child. */
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close (fds[0]);
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pthread_t thr;
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result = pthread_create (&thr, 0, block, 0);
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assert (result == 0);
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/* Wait until the TID has been assigned. */
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pthread_barrier_wait (&barrier);
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assert (bg_tid != 0);
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result = write (fds[1], &bg_tid, sizeof (bg_tid));
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assert (result == sizeof (bg_tid));
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sleep (FIVE_MINUTES);
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}
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exit (0);
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}
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