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/* This testcase is part of GDB, the GNU debugger.

   Copyright 2009, 2010 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;

}