sigstack.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 45 行

/* Copyright (C) 1992,97,98,2000 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 <hurd.h>

/* Run signals handlers on the stack specified by SS (if not NULL).
   If OSS is not NULL, it is filled in with the old signal stack status.  */
int
sigstack (struct sigstack *ss, struct sigstack *oss)
{
  struct sigaltstack as, oas;

  as.ss_sp = ss->ss_sp;
  as.ss_size = 0;
  as.ss_flags = 0;

  if (__sigaltstack (&as, &oas) < 0)
    return -1;

  if (oss != NULL)
    {
      oss->ss_sp = oas.ss_sp;
      oss->ss_onstack = oas.ss_flags & SS_ONSTACK;
    }

  return 0;
}