unix/SystemInterpreter.cpp

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/*----------------------------------------------------------------------------*/
/*                                                                            */
/* Copyright (c) 1995, 2004 IBM Corporation. All rights reserved.             */
/* Copyright (c) 2005-2012 Rexx Language Association. All rights reserved.    */
/*                                                                            */
/* This program and the accompanying materials are made available under       */
/* the terms of the Common Public License v1.0 which accompanies this         */
/* distribution. A copy is also available at the following address:           */
/* http://www.ibm.com/developerworks/oss/CPLv1.0.htm                          */
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/* Redistribution and use in source and binary forms, with or                 */
/* without modification, are permitted provided that the following            */
/* conditions are met:                                                        */
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/* notice, this list of conditions and the following disclaimer.              */
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/* the documentation and/or other materials provided with the distribution.   */
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/* of its contributors may be used to endorse or promote products             */
/* derived from this software without specific prior written permission.      */
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/* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS        */
/* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT          */
/* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS          */
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/*****************************************************************************/
/* REXX Windows Support                                                      */
/*                                                                           */
/* Main Windows interpreter control.  This is the preferred location for     */
/* all platform dependent global variables.                                  */
/* The interpreter does not instantiate an instance of this                  */
/* class, so most variables and methods should be static.                    */
/*                                                                           */
/*                                                                           */
/*****************************************************************************/
 
#include <stdio.h>
#include <termios.h>
#include "RexxCore.h"
#include "SystemInterpreter.hpp"
#include "Interpreter.hpp"
 
sigset_t SystemInterpreter::oldmask;
sigset_t SystemInterpreter::newmask;
 
class InterpreterInstance;
 
void SystemInterpreter::processStartup()
{
    // now do the platform independent startup
    Interpreter::processStartup();
}
 
 
void SystemInterpreter::processShutdown()
{
    // now do the platform independent shutdown
    Interpreter::processStartup();
}
 
#define ORXAP_DEBUG
void signalHandler(int sig)
{
 
#ifdef ORXAP_DEBUG
    switch (sig)
    {
        case (SIGINT):
            printf("\n*** Rexx interrupted.\n");
            break;
        case (SIGTERM):
            printf("\n*** Rexx terminated.\n*** Closing Rexx !\n");  /* exit(0); */
            break;
        case (SIGSEGV):
            printf("\n*** Segmentation fault.\n*** Closing Rexx !\n");
            break;
        case (SIGFPE):
            printf("\n*** Floating point error.\n*** Closing Rexx\n");
            break;
        case (SIGBUS):
            printf("\n*** Bus error.\n*** Closing Rexx\n");
            break;
        case (SIGPIPE):
            printf("\n*** Broken pipe.\n*** Closing Rexx\n");
            break;
        default:
            printf("\n*** Error,closing REXX !\n");
            break;
    }
#endif
 
    // if the signal is a ctrl-C, we perform a halt operation
    if (sig == SIGINT)
    {
        Interpreter::haltAllActivities(OREF_SIGINT_STRING);
        return;
    }
    else if (sig == SIGTERM)
    {
        Interpreter::haltAllActivities(OREF_SIGTERM_STRING);
        return;
    }
    else if (sig == SIGHUP)
    {
        Interpreter::haltAllActivities(OREF_SIGHUP_STRING);
        return;
    }
    else
    {
        exit(0);
    }
}
 
 
void SystemInterpreter::startInterpreter()
{
 
    /* Set the cleanup handler for unconditional process termination          */
    struct sigaction new_action;
    struct sigaction old_action;
 
    /* Set up the structure to specify the new action                         */
    new_action.sa_handler = signalHandler;
    old_action.sa_handler = NULL;
    sigfillset(&new_action.sa_mask);
//    new_action.sa_flags = SA_RESTART;
    new_action.sa_flags = 0; // do not use SA_RESTART or ctrl-c will not work as expected!
 
/* Termination signals are set by Object REXX whenever the signals were not set */
/* from outside (calling C-routine). The SIGSEGV signal is not set any more, so */
/* that we now get a coredump instead of a hang up                              */
 
    sigaction(SIGINT, NULL, &old_action);
    sigaction(SIGTERM, NULL, &old_action);
    sigaction(SIGHUP, NULL, &old_action);
    if (old_action.sa_handler == NULL)           /* not set by ext. exit handler*/
    {
        sigaction(SIGINT, &new_action, NULL);  /* exitClear on SIGINT signal    */
        sigaction(SIGTERM, &new_action, NULL); /* exitClear on SIGTERM signal   */
        sigaction(SIGHUP, &new_action, NULL);  /* exitClear on SIGHUP signal    */
    }
}
 
 
void SystemInterpreter::terminateInterpreter()
{
// revert stdin and stdout back to their original states
    setvbuf(stdin, (char *)NULL, _IOLBF, 0);
    setvbuf(stdout, (char *)NULL, _IOLBF, 0);
}
 
 
 
void SystemInterpreter::live(size_t liveMark)
{
}
 
void SystemInterpreter::liveGeneral(int reason)
{
  if (!memoryObject.savingImage())
  {
  }
}
 
 
/**
 * Get the current working directory for the process.
 *
 * @return The current working directory as a Rexx string.
 */
void SystemInterpreter::getCurrentWorkingDirectory(char *buf)
{
    if (!getcwd(buf, PATH_MAX)) /* Get current working direct */
    {
       strncpy(buf, getenv("PWD"), PATH_MAX);
       // if we don't result in a real directory here, make it a null string.
       if (buf[0] != '/' )
       {
           buf[0] = '\0';
       }
    }
}