Esempi in C++ (Cpp) per _hurd_critical_section_lock

Esempio n. 1

File: getgroups.c Progetto: riscv/riscv-glibc

int
__getgroups (int n, gid_t *gidset)
{
  error_t err;
  int ngids;
  void *crit;

  if (n < 0)
    return __hurd_fail (EINVAL);

  crit = _hurd_critical_section_lock ();
  __mutex_lock (&_hurd_id.lock);

  if (err = _hurd_check_ids ())
    {
      __mutex_unlock (&_hurd_id.lock);
      _hurd_critical_section_unlock (crit);
      return __hurd_fail (err);
    }

  ngids = _hurd_id.gen.ngids;

  if (n != 0)
    {
      /* Copy the gids onto stack storage and then release the idlock.  */
      gid_t gids[ngids];
      memcpy (gids, _hurd_id.gen.gids, sizeof (gids));
      __mutex_unlock (&_hurd_id.lock);
      _hurd_critical_section_unlock (crit);

      /* Now that the lock is released, we can safely copy the
	 group set into the user's array, which might fault.  */
      if (ngids > n)
	return __hurd_fail (EINVAL);
      memcpy (gidset, gids, ngids * sizeof (gid_t));
    }
  else
    {
      __mutex_unlock (&_hurd_id.lock);
      _hurd_critical_section_unlock (crit);
    }

  return ngids;
}

Esempio n. 2

File: geteuids.c Progetto: AdvancedC/glibc

int
geteuids (int n, uid_t *uidset)
{
  error_t err;
  int nuids;
  void *crit;

  crit = _hurd_critical_section_lock ();
  __mutex_lock (&_hurd_id.lock);

  if (err = _hurd_check_ids ())
    {
      __mutex_unlock (&_hurd_id.lock);
      _hurd_critical_section_unlock (crit);
      return __hurd_fail (err);
    }

  nuids = _hurd_id.gen.nuids;

  if (n != 0)
    {
      /* Copy the uids onto stack storage and then release the idlock.  */
      uid_t uids[nuids];
      memcpy (uids, _hurd_id.gen.uids, sizeof (uids));
      __mutex_unlock (&_hurd_id.lock);
      _hurd_critical_section_unlock (crit);

      /* Now that the lock is released, we can safely copy the
	 uid set into the user's array, which might fault.  */
      if (nuids > n)
	nuids = n;
      memcpy (uidset, uids, nuids * sizeof (uid_t));
    }
  else
    {
      __mutex_unlock (&_hurd_id.lock);
      _hurd_critical_section_unlock (crit);
    }

  return nuids;
}