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. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  *
  33  * $FreeBSD: src/lib/libc/gen/siginterrupt.c,v 1.2.8.1 2001/03/05 09:34:53 obrien Exp $
  34  * $DragonFly: src/lib/libc/gen/siginterrupt.c,v 1.4 2005/11/13 00:07:42 swildner Exp $
  35  *
  36  * @(#)siginterrupt.c   8.1 (Berkeley) 6/4/93
  37  */
  38
  39 #include "namespace.h"
  40 #include <signal.h>
  41 #include "un-namespace.h"
  42 #include "libc_private.h"
  43
  44 /*
  45  * Set signal state to prevent restart of system calls
  46  * after an instance of the indicated signal.
  47  */
  48 int
  49 siginterrupt(int sig, int flag)
  50 {
  51         extern sigset_t _sigintr;
  52         struct sigaction sa;
  53         int ret;
  54
  55         if ((ret = _sigaction(sig, NULL, &sa)) < 0)
  56                 return (ret);
  57         if (flag) {
  58                 sigaddset(&_sigintr, sig);
  59                 sa.sa_flags &= ~SA_RESTART;
  60         } else {
  61                 sigdelset(&_sigintr, sig);
  62                 sa.sa_flags |= SA_RESTART;
  63         }
  64         return (_sigaction(sig, &sa, NULL));
  65 }