/* Copyright (C) 1992-2018 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 <stddef.h>

#include <signal.h>

#include <errno.h>

#include <sigsetops.h>

/* If INTERRUPT is nonzero, make signal SIG interrupt system calls

   (causing them to fail with EINTR); if INTERRUPT is zero, make system

   calls be restarted after signal SIG.  */

int

siginterrupt (int sig, int interrupt)

{

#ifdef	SA_RESTART

  extern sigset_t _sigintr attribute_hidden;	/* Defined in signal.c.  */

  struct sigaction action;

  if (__sigaction (sig, (struct sigaction *) NULL, &action) < 0)

    return -1;

  if (interrupt)

    {

      __sigaddset (&_sigintr, sig);

      action.sa_flags &= ~SA_RESTART;

    }

  else

    {

      __sigdelset (&_sigintr, sig);

      action.sa_flags |= SA_RESTART;

    }

  if (__sigaction (sig, &action, (struct sigaction *) NULL) < 0)

    return -1;

  return 0;

#else

  __set_errno (ENOSYS);

  return -1;

#endif

}