/* BSD-like signal function.   Copyright (C) 1991, 1992, 1996, 1997, 2000 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, write to the Free   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA   02111-1307 USA.  */#include <errno.h>#include <signal.h>#include <machine/weakalias.h>sigset_t _sigintr;		/* Set by siginterrupt.  *//* Set the handler for the signal SIG to HANDLER,   returning the old handler, or SIG_ERR on error.  */__sighandler_t__bsd_signal (sig, handler)     int sig;     __sighandler_t handler;{  struct sigaction act, oact;  /* Check signal extents to protect __sigismember.  */  if (handler == SIG_ERR || sig < 1 || sig >= NSIG)    {      errno = (EINVAL);      return SIG_ERR;    }  act.sa_handler = handler;  if (sigemptyset (&act.sa_mask) < 0      || sigaddset (&act.sa_mask, sig) < 0)    return SIG_ERR;  act.sa_flags = sigismember (&_sigintr, sig) ? 0 : SA_RESTART;  if (sigaction (sig, &act, &oact) < 0)    return SIG_ERR;  return oact.sa_handler;}weak_alias (__bsd_signal, bsd_signal)weak_alias (__bsd_signal, signal)weak_alias (__bsd_signal, ssignal)