2.11BSD#431 - /usr/src/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: 
  34: #if defined(LIBC_SCCS) && !defined(lint)
  35: static char sccsid[] = "@(#)siginterrupt.c	8.1 (Berkeley) 6/4/93";
  36: #endif /* LIBC_SCCS and not lint */
  37: 
  38: #include <signal.h>
  39: 
  40: /*
  41:  * Set signal state to prevent restart of system calls
  42:  * after an instance of the indicated signal.
  43:  */
  44: siginterrupt(sig, flag)
  45:     int sig, flag;
  46: {
  47:     extern sigset_t _sigintr;
  48:     struct sigaction sa;
  49:     int ret;
  50: 
  51:     if ((ret = sigaction(sig, (struct sigaction *)0, &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, (struct sigaction *)0));
  61: }

Defined functions

Defined variables