mirror of
https://github.com/espressif/binutils-gdb.git
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1d506c26d9
This commit is the result of the following actions:
- Running gdb/copyright.py to update all of the copyright headers to
include 2024,
- Manually updating a few files the copyright.py script told me to
update, these files had copyright headers embedded within the
file,
- Regenerating gdbsupport/Makefile.in to refresh it's copyright
date,
- Using grep to find other files that still mentioned 2023. If
these files were updated last year from 2022 to 2023 then I've
updated them this year to 2024.
I'm sure I've probably missed some dates. Feel free to fix them up as
you spot them.
122 lines
3.4 KiB
C
122 lines
3.4 KiB
C
/* This testcase is part of GDB, the GNU debugger.
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Copyright 2009-2024 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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The original issue we're trying to test is described in this
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thread:
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https://sourceware.org/legacy-ml/gdb-patches/2009-06/msg00802.html
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The NEW_THREAD_EVENT code the comments below refer to no longer
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exists in GDB, so the following comments are kept for historical
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reasons, and to guide future updates to the testcase.
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---
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Do not use threads as we need to exploit a bug in LWP code masked by the
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threads code otherwise.
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INFERIOR_PTID must point to exited LWP. Here we use the initial LWP as it
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is automatically INFERIOR_PTID for GDB.
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Finally we need to call target_resume (RESUME_ALL, ...) which we invoke by
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NEW_THREAD_EVENT (called from the new LWP as initial LWP is exited now). */
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#define _GNU_SOURCE
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#include <sched.h>
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#include <assert.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <sys/types.h>
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#include <sys/wait.h>
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#define STACK_SIZE 0x1000
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/* True if the 'fn_return' thread has been reached at the point after
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its parent is already gone. */
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volatile int fn_return_reached = 0;
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/* True if the 'fn' thread has exited. */
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volatile int fn_exited = 0;
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/* Wrapper around clone. */
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static int
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do_clone (int (*fn)(void *))
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{
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unsigned char *stack;
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int new_pid;
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stack = malloc (STACK_SIZE);
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assert (stack != NULL);
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new_pid = clone (fn, stack + STACK_SIZE, CLONE_FILES | CLONE_VM,
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NULL, NULL, NULL, NULL);
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assert (new_pid > 0);
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return new_pid;
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}
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static int
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fn_return (void *unused)
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{
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/* Wait until our direct parent exits. We want the breakpoint set a
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couple lines below to hit with the previously-selected thread
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gone. */
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while (!fn_exited)
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usleep (1);
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fn_return_reached = 1; /* at-fn_return */
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return 0;
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}
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static int
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fn (void *unused)
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{
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do_clone (fn_return);
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return 0;
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}
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int
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main (int argc, char **argv)
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{
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int new_pid, status, ret;
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new_pid = do_clone (fn);
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/* Note the clone call above didn't use CLONE_THREAD, so it actually
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put the new child in a new thread group. However, the new clone
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is still reported with PTRACE_EVENT_CLONE to GDB, since we didn't
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use CLONE_VFORK (results in PTRACE_EVENT_VFORK) nor set the
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termination signal to SIGCHLD (results in PTRACE_EVENT_FORK), so
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GDB thinks of it as a new thread of the same inferior. It's a
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bit of an odd setup, but it's not important for what we're
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testing, and, it let's us conveniently use waitpid to wait for
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the child, which you can't with CLONE_THREAD. */
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ret = waitpid (new_pid, &status, __WALL);
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assert (ret == new_pid);
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assert (WIFEXITED (status) && WEXITSTATUS (status) == 0);
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fn_exited = 1;
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/* Don't exit before the breakpoint at fn_return triggers. */
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while (!fn_return_reached)
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usleep (1);
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return 0;
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}
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