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/* This testcase is part of GDB, the GNU debugger.
Copyright 2009-2021 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/>.
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 <features.h>
#ifdef __UCLIBC__
#if !(defined(__UCLIBC_HAS_MMU__) || defined(__ARCH_HAS_MMU__))
#define HAS_NOMMU
#endif
#endif
#define STACK_SIZE 0x1000
static int
fn_return (void *unused)
{
return 0; /* at-fn_return */
}
static int
fn (void *unused)
{
int i;
unsigned char *stack;
int new_pid;
i = sleep (1);
assert (i == 0);
stack = malloc (STACK_SIZE);
assert (stack != NULL);
new_pid = clone (fn_return, stack + STACK_SIZE, CLONE_FILES
#if defined(__UCLIBC__) && defined(HAS_NOMMU)
| CLONE_VM
#endif /* defined(__UCLIBC__) && defined(HAS_NOMMU) */
, NULL, NULL, NULL, NULL);
assert (new_pid > 0);
return 0;
}
int
main (int argc, char **argv)
{
unsigned char *stack;
int new_pid;
stack = malloc (STACK_SIZE);
assert (stack != NULL);
new_pid = clone (fn, stack + STACK_SIZE, CLONE_FILES
#if defined(__UCLIBC__) && defined(HAS_NOMMU)
| CLONE_VM
#endif /* defined(__UCLIBC__) && defined(HAS_NOMMU) */
, NULL, NULL, NULL, NULL);
assert (new_pid > 0);
return 0;
}
|
