#include <unistd.h>
#include <assert.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <stdlib.h>
#include <sched.h>
#include <sys/mman.h>

#define FLAGS (CLONE_VM | CLONE_FS | CLONE_FILES | CLONE_SIGHAND \
	       | CLONE_THREAD | CLONE_SYSVSEM)

static int
child_func (void *arg)
{
  sleep (60);
  _exit (EXIT_SUCCESS);
  abort ();
}

int
main (void)
{
#ifndef PAGE_SIZE
#define PAGE_SIZE 0x1000
#endif
  const size_t stack_size = PAGE_SIZE;
  unsigned char *stack = mmap (NULL, stack_size, PROT_READ | PROT_WRITE,
			       MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
  int child_tid;

  assert (stack != NULL);
  assert (stack != MAP_FAILED);
  stack[0] = 0;
  stack[stack_size - 1] = 0;

#ifdef __ia64__
  extern int __clone2 (int (*fn) (void *arg), void *child_stack,
		       size_t stack_size, int flags, void *arg);
  child_tid = __clone2 (child_func, stack + stack_size, stack_size,
			FLAGS, NULL);
#else	/* !__ia64__ */
  child_tid = clone (child_func, stack + stack_size, FLAGS, NULL);
#endif	/* !__ia64__ */

  sleep (60);

  return EXIT_SUCCESS;
}