213516ef31
This commit is the result of running the gdb/copyright.py script, which automated the update of the copyright year range for all source files managed by the GDB project to be updated to include year 2023.
121 lines
3.4 KiB
C
121 lines
3.4 KiB
C
/* This testcase is part of GDB, the GNU debugger.
|
|
|
|
Copyright 2009-2023 Free Software Foundation, Inc.
|
|
|
|
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/>.
|
|
|
|
|
|
The original issue we're trying to test is described in this
|
|
thread:
|
|
|
|
https://sourceware.org/legacy-ml/gdb-patches/2009-06/msg00802.html
|
|
|
|
The NEW_THREAD_EVENT code the comments below refer to no longer
|
|
exists in GDB, so the following comments are kept for historical
|
|
reasons, and to guide future updates to the testcase.
|
|
|
|
---
|
|
|
|
Do not use threads as we need to exploit a bug in LWP code masked by the
|
|
threads code otherwise.
|
|
|
|
INFERIOR_PTID must point to exited LWP. Here we use the initial LWP as it
|
|
is automatically INFERIOR_PTID for GDB.
|
|
|
|
Finally we need to call target_resume (RESUME_ALL, ...) which we invoke by
|
|
NEW_THREAD_EVENT (called from the new LWP as initial LWP is exited now). */
|
|
|
|
#define _GNU_SOURCE
|
|
#include <sched.h>
|
|
#include <assert.h>
|
|
#include <unistd.h>
|
|
#include <stdlib.h>
|
|
#include <sys/types.h>
|
|
#include <sys/wait.h>
|
|
|
|
#define STACK_SIZE 0x1000
|
|
|
|
/* True if the 'fn_return' thread has been reached at the point after
|
|
its parent is already gone. */
|
|
volatile int fn_return_reached = 0;
|
|
|
|
/* True if the 'fn' thread has exited. */
|
|
volatile int fn_exited = 0;
|
|
|
|
/* Wrapper around clone. */
|
|
|
|
static int
|
|
do_clone (int (*fn)(void *))
|
|
{
|
|
unsigned char *stack;
|
|
int new_pid;
|
|
|
|
stack = malloc (STACK_SIZE);
|
|
assert (stack != NULL);
|
|
|
|
new_pid = clone (fn, stack + STACK_SIZE, CLONE_FILES | CLONE_VM,
|
|
NULL, NULL, NULL, NULL);
|
|
assert (new_pid > 0);
|
|
|
|
return new_pid;
|
|
}
|
|
|
|
static int
|
|
fn_return (void *unused)
|
|
{
|
|
/* Wait until our direct parent exits. We want the breakpoint set a
|
|
couple lines below to hit with the previously-selected thread
|
|
gone. */
|
|
while (!fn_exited)
|
|
usleep (1);
|
|
|
|
fn_return_reached = 1; /* at-fn_return */
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
fn (void *unused)
|
|
{
|
|
do_clone (fn_return);
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
main (int argc, char **argv)
|
|
{
|
|
int new_pid, status, ret;
|
|
|
|
new_pid = do_clone (fn);
|
|
|
|
/* Note the clone call above didn't use CLONE_THREAD, so it actually
|
|
put the new child in a new thread group. However, the new clone
|
|
is still reported with PTRACE_EVENT_CLONE to GDB, since we didn't
|
|
use CLONE_VFORK (results in PTRACE_EVENT_VFORK) nor set the
|
|
termination signal to SIGCHLD (results in PTRACE_EVENT_FORK), so
|
|
GDB thinks of it as a new thread of the same inferior. It's a
|
|
bit of an odd setup, but it's not important for what we're
|
|
testing, and, it let's us conveniently use waitpid to wait for
|
|
the child, which you can't with CLONE_THREAD. */
|
|
ret = waitpid (new_pid, &status, __WALL);
|
|
assert (ret == new_pid);
|
|
assert (WIFEXITED (status) && WEXITSTATUS (status) == 0);
|
|
|
|
fn_exited = 1;
|
|
|
|
/* Don't exit before the breakpoint at fn_return triggers. */
|
|
while (!fn_return_reached)
|
|
usleep (1);
|
|
|
|
return 0;
|
|
}
|