usr/src/lib/libc/port/sys/bsd_signal.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21
  22 /*
  23  * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  */
  26
  27 #pragma ident   "%Z%%M% %I%     %E% SMI"
  28
  29 #pragma weak _bsd_signal = bsd_signal
  30
  31 #include "lint.h"
  32 #include <sys/types.h>
  33 #include <errno.h>
  34 #include <signal.h>
  35 #include <wait.h>
  36
  37 /*
  38  * Check for valid signal number
  39  */
  40 #define CHECK_SIG(s, code) \
  41         if ((s) <= 0 || (s) >= NSIG || (s) == SIGKILL || (s) == SIGSTOP) { \
  42                 errno = EINVAL; \
  43                 return (code); \
  44         }
  45
  46 void (*
  47 bsd_signal(int sig, void(*func)(int)))(int)
  48 {
  49         struct sigaction nact;
  50         struct sigaction oact;
  51
  52         CHECK_SIG(sig, SIG_ERR);
  53
  54         nact.sa_handler = func;
  55         nact.sa_flags = SA_RESTART;
  56         (void) sigemptyset(&nact.sa_mask);
  57         (void) sigaddset(&nact.sa_mask, sig);
  58
  59         if (sigaction(sig, &nact, &oact) == -1)
  60                 return (SIG_ERR);
  61
  62         return (oact.sa_handler);
  63 }