/* Copyright (C) 1991-2018 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or

   modify it under the terms of the GNU Lesser General Public

   License as published by the Free Software Foundation; either

   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library 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

   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public

   License along with the GNU C Library; if not, see

   <http://www.gnu.org/licenses/>.  */

#include <errno.h>

#include <signal.h>

#include <hurd.h>

#include <hurd/signal.h>

#include <hurd/msg.h>

/* If SET is not NULL, modify the current set of blocked signals

   according to HOW, which may be SIG_BLOCK, SIG_UNBLOCK or SIG_SETMASK.

   If OSET is not NULL, store the old set of blocked signals in *OSET.  */

int

__sigprocmask (int how, const sigset_t *set, sigset_t *oset)

{

  struct hurd_sigstate *ss;

  sigset_t old, new;

  sigset_t pending;

  if (set != NULL)

    new = *set;

  ss = _hurd_self_sigstate ();

  __spin_lock (&ss->lock);

  old = ss->blocked;

  if (set != NULL)

    {

      switch (how)

	{

	case SIG_BLOCK:

	  __sigorset (&ss->blocked, &ss->blocked, &new;;

	  break;

	case SIG_UNBLOCK:

	  ss->blocked &= ~new;

	  break;

	case SIG_SETMASK:

	  ss->blocked = new;

	  break;

	default:

	  __spin_unlock (&ss->lock);

	  errno = EINVAL;

	  return -1;

	}

      ss->blocked &= ~_SIG_CANT_MASK;

    }

  pending = ss->pending & ~ss->blocked;

  __spin_unlock (&ss->lock);

  if (oset != NULL)

    *oset = old;

  if (pending)

    /* Send a message to the signal thread so it

       will wake up and check for pending signals.  */

    __msg_sig_post (_hurd_msgport, 0, 0, __mach_task_self ());

  return 0;

}

libc_hidden_def (__sigprocmask)

weak_alias (__sigprocmask, sigprocmask)