sigprocmask.c

来自「glibc 库, 不仅可以学习使用库函数,还可以学习函数的具体实现,是提高功力的」· C语言 代码 · 共 42 行

/* Copyright (C) 2001, 2003 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.  */

/* 64 bit Linux for S/390 only has rt signals, thus we do not even want to try
   falling back to the old style signals as the default Linux handler does. */

#include <errno.h>
#include <signal.h>
#include <unistd.h>

#include <sysdep.h>
#include <sys/syscall.h>

/* Get and/or change the set of blocked signals.  */
int
__sigprocmask (how, set, oset)
     int how;
     const sigset_t *set;
     sigset_t *oset;
{

  /* XXX The size argument hopefully will have to be changed to the
     real size of the user-level sigset_t.  */
  return INLINE_SYSCALL (rt_sigprocmask, 4, how, set, oset, _NSIG / 8);
}
weak_alias (__sigprocmask, sigprocmask)