usr/src/lib/efcode/engine/alarm.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 (c) 1999 by Sun Microsystems, Inc.
  24  * All rights reserved.
  25  */
  26
  27 #pragma ident   "%Z%%M% %I%     %E% SMI"
  28
  29 #include <stdio.h>
  30 #include <stdlib.h>
  31 #include <string.h>
  32 #include <signal.h>
  33 #include <unistd.h>
  34 #include <fcode/private.h>
  35
  36 /*
  37  * 'user-abort' Fcode
  38  */
  39 void
  40 user_abort(fcode_env_t *env)
  41 {
  42         forth_abort(env, "user-abort called");
  43 }
  44
  45 static fstack_t alarm_xt;
  46 static fstack_t alarm_ms;
  47 static fcode_env_t *alarm_env;
  48
  49 static void
  50 catch_alarm(int signo)
  51 {
  52         fcode_env_t *env = alarm_env;
  53
  54         if (env && alarm_xt && alarm_ms) {
  55                 PUSH(DS, alarm_xt);
  56                 execute(env);
  57                 signal(SIGALRM, catch_alarm);
  58                 alarm((alarm_ms + 999)/1000);
  59         }
  60 }
  61
  62 /*
  63  * 'alarm' Fcode
  64  */
  65 void
  66 do_alarm(fcode_env_t *env)
  67 {
  68         fstack_t ms, xt;
  69
  70         CHECK_DEPTH(env, 2, "alarm");
  71         ms = POP(DS);
  72         xt = POP(DS);
  73         if (ms == 0) {
  74                 alarm(0);
  75                 signal(SIGALRM, SIG_DFL);
  76                 alarm_xt = 0;
  77                 alarm_ms = 0;
  78                 alarm_env = 0;
  79         } else {
  80                 signal(SIGALRM, catch_alarm);
  81                 alarm_xt = xt;
  82                 alarm_ms = ms;
  83                 alarm_env = env;
  84                 alarm((ms + 999)/1000);
  85         }
  86 }
  87
  88 #pragma init(_init)
  89
  90 static void
  91 _init(void)
  92 {
  93         fcode_env_t *env = initial_env;
  94
  95         ASSERT(env);
  96         NOTICE;
  97
  98         P1275(0x213, 0,         "alarm",                do_alarm);
  99
 100         P1275(0x219, 0,         "user-abort",           user_abort);
 101 }