/* Copyright (C) 2002, 2003, 2004 Free Software Foundation, Inc.   This file is part of the GNU C Library.   Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.   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 <pthreadP.h>#include <sysdep.h>intpthread_sigmask (how, newmask, oldmask)     int how;     const sigset_t *newmask;     sigset_t *oldmask;{  sigset_t local_newmask;  /* The only thing we have to make sure here is that SIGCANCEL and     SIGSETXID is not blocked.  */  if (newmask != NULL      && (__builtin_expect (__sigismember (newmask, SIGCANCEL), 0)	  || __builtin_expect (__sigismember (newmask, SIGSETXID), 0)))    {      local_newmask = *newmask;      __sigdelset (&local_newmask, SIGCANCEL);      __sigdelset (&local_newmask, SIGSETXID);      newmask = &local_newmask;    }#ifdef INTERNAL_SYSCALL  /* We know that realtime signals are available if NPTL is used.  */  INTERNAL_SYSCALL_DECL (err);  int result = INTERNAL_SYSCALL (rt_sigprocmask, err, 4, how, newmask,				 oldmask, _NSIG / 8);  return (INTERNAL_SYSCALL_ERROR_P (result, err)	  ? INTERNAL_SYSCALL_ERRNO (result, err)	  : 0);#else  return sigprocmask (how, newmask, oldmask) == -1 ? errno : 0;#endif}