usr/src/cmd/ttymon/tmsig.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, Version 1.0 only
   6  * (the "License").  You may not use this file except in compliance
   7  * with the License.
   8  *
   9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
  10  * or http://www.opensolaris.org/os/licensing.
  11  * See the License for the specific language governing permissions
  12  * and limitations under the License.
  13  *
  14  * When distributing Covered Code, include this CDDL HEADER in each
  15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  16  * If applicable, add the following below this CDDL HEADER, with the
  17  * fields enclosed by brackets "[]" replaced with your own identifying
  18  * information: Portions Copyright [yyyy] [name of copyright owner]
  19  *
  20  * CDDL HEADER END
  21  */
  22 /*
  23  * Copyright 2004 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  */
  26 /*      Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
  27 /*        All Rights Reserved   */
  28
  29
  30 #pragma ident   "%Z%%M% %I%     %E% SMI"
  31
  32 #include        <stdio.h>
  33 #include        <signal.h>
  34 #include        "tmextern.h"
  35
  36 /*
  37  * catch_signals:
  38  *      ttymon catch some signals and ignore the rest.
  39  *
  40  *      SIGTERM - killed by somebody
  41  *      SIGPOLL - got message on pmpipe, probably from sac
  42  *                         or on PCpipe
  43  *      SIGCLD  - tmchild died
  44  */
  45 void
  46 catch_signals()
  47 {
  48         sigset_t cset;
  49         struct sigaction sigact;
  50         extern void sigterm();
  51         extern void sigchild();
  52         extern void sigpoll_catch();
  53 #ifdef  DEBUG
  54         extern void dump_pmtab();
  55         extern void dump_ttydefs();
  56
  57         debug("in catch_signals");
  58 #endif
  59
  60         cset = Origmask;
  61         (void)sigdelset(&cset, SIGTERM);
  62         (void)sigdelset(&cset, SIGCLD);
  63         (void)sigdelset(&cset, SIGPOLL);
  64 #ifdef  DEBUG
  65         (void)sigdelset(&cset, SIGUSR1);
  66         (void)sigdelset(&cset, SIGUSR2);
  67 #endif
  68         (void)sigprocmask(SIG_SETMASK, &cset, NULL);
  69         sigact.sa_flags = 0;
  70         sigact.sa_handler = sigterm;
  71         (void)sigemptyset(&sigact.sa_mask);
  72         (void)sigaddset(&sigact.sa_mask, SIGTERM);
  73         (void)sigaction(SIGTERM, &sigact, NULL);
  74         sigact.sa_flags = 0;
  75         sigact.sa_handler = sigchild;
  76         (void)sigemptyset(&sigact.sa_mask);
  77         (void)sigaction(SIGCLD, &sigact, NULL);
  78         sigact.sa_flags = 0;
  79         sigact.sa_handler = sigpoll_catch;
  80         (void)sigemptyset(&sigact.sa_mask);
  81         (void)sigaddset(&sigact.sa_mask, SIGPOLL);
  82         (void)sigaction(SIGPOLL, &sigact, NULL);
  83 #ifdef  DEBUG
  84         sigact.sa_flags = 0;
  85         sigact.sa_handler = dump_pmtab;
  86         (void)sigemptyset(&sigact.sa_mask);
  87         (void)sigaddset(&sigact.sa_mask, SIGUSR1);
  88         (void)sigaction(SIGUSR1, &sigact, NULL);
  89         sigact.sa_flags = 0;
  90         sigact.sa_handler = dump_ttydefs;
  91         (void)sigemptyset(&sigact.sa_mask);
  92         (void)sigaddset(&sigact.sa_mask, SIGUSR2);
  93         (void)sigaction(SIGUSR2, &sigact, NULL);
  94 #endif
  95 }
  96
  97 /*
  98  * child_sigcatch() - tmchild inherits some signal_catch from parent
  99  *                    and need to reset them
 100  */
 101 void
 102 child_sigcatch()
 103 {
 104         struct  sigaction       sigact;
 105         sigset_t cset;
 106         extern  void    sigpoll();
 107         extern  void    sigint();
 108
 109         cset = Origmask;
 110         (void)sigdelset(&cset, SIGINT);
 111         (void)sigdelset(&cset, SIGPOLL);
 112         (void)sigprocmask(SIG_SETMASK, &cset, NULL);
 113         sigact.sa_flags = 0;
 114         sigact.sa_handler = sigpoll;
 115         (void)sigemptyset(&sigact.sa_mask);
 116         (void)sigaddset(&sigact.sa_mask, SIGPOLL);
 117         (void)sigaction(SIGPOLL, &sigact, NULL);
 118         sigact.sa_flags = 0;
 119         sigact.sa_handler = sigint;
 120         (void)sigemptyset(&sigact.sa_mask);
 121         (void)sigaddset(&sigact.sa_mask, SIGINT);
 122         (void)sigaction(SIGINT, &sigact, NULL);
 123 }