lib/libc/gen/siginterrupt.c

   1 /*
   2  * Copyright (c) 1989, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  *
  29  * $FreeBSD: src/lib/libc/gen/siginterrupt.c,v 1.2.8.1 2001/03/05 09:34:53 obrien Exp $
  30  * $DragonFly: src/lib/libc/gen/siginterrupt.c,v 1.4 2005/11/13 00:07:42 swildner Exp $
  31  *
  32  * @(#)siginterrupt.c   8.1 (Berkeley) 6/4/93
  33  */
  34
  35 #include "namespace.h"
  36 #include <signal.h>
  37 #include "un-namespace.h"
  38 #include "libc_private.h"
  39
  40 /*
  41  * Set signal state to prevent restart of system calls
  42  * after an instance of the indicated signal.
  43  */
  44 int
  45 siginterrupt(int sig, int flag)
  46 {
  47         extern sigset_t _sigintr;
  48         struct sigaction sa;
  49         int ret;
  50
  51         if ((ret = _sigaction(sig, NULL, &sa)) < 0)
  52                 return (ret);
  53         if (flag) {
  54                 sigaddset(&_sigintr, sig);
  55                 sa.sa_flags &= ~SA_RESTART;
  56         } else {
  57                 sigdelset(&_sigintr, sig);
  58                 sa.sa_flags |= SA_RESTART;
  59         }
  60         return (_sigaction(sig, &sa, NULL));
  61 }