file: WishIntfc.hxx


/*--
  Description:

  Class WishIntfc is used to interface to a 'wish' shell
  It has functions that 'spawn' a wish shell and establish
  pipes that communicate with the wish shell

  Last Modified: 18 Jan, 1999 by Prakash Gopalakrishnan (prakashg@ece.cmu.edu)

  --*/
#ifndef WISH_INTFC_HXX___
#define WISH_INTFC_HXX___

#include "SystemStuff.hxx"
#include <iostream.h>
#include <fstream.h>
#include <assert.h>
#include <string.h>
#define MAX_TCL_COMMAND_LENGTH 300


class WishIntfc
{
public:
  
 
  WishIntfc(void) { Initialize(); }      //OVERLOAD CALL: Initialize: WishIntfc.cxx(WishIntfc), wishGui.cxx(wishGui)
  ~WishIntfc(void) {}
    
  void SetPath(const char* aPath) { strcpy(path,aPath);}
  // set the path to run wish from

  int Start(char* tcl_fname);         //OVERLOAD CALL: Start: WishIntfc.cxx(WishIntfc), wishGui.cxx(wishGui)
  // spawns wish shell &
  // source TCL script from tcl_fname

  int End(void);        //OVERLOAD CALL: End: WishIntfc.cxx(WishIntfc), wishGui.cxx(wishGui)
  // runs exit from wish

  int Kill(void);
  // kills the process
  
  int SendCommand(const char* cmd);
  // sends a wish command


  void Print(ostream& out) const {;}
  void Read(istream& in) {;}



protected:

  char TCLcommand[MAX_TCL_COMMAND_LENGTH];     
  char path[50]; // wish's path 
  int toWish, fromWish; // used for communicating with wish
  pid_t childPid; // used for spawning wish process
    
  //void Free(void) {;}
  void Initialize(void);        //OVERLOAD CALL: Initialize: WishIntfc.cxx(WishIntfc), wishGui.cxx(wishGui)
  
  friend ostream& operator<<(ostream& out, const WishIntfc& x) {
    x.Print(out);
    return out;
  }
  
  friend istream& operator>>(istream& in, WishIntfc& x) {
    x.Read(in);
    return in;
  }  



};


// function that catches the SIGALRM
void wish_catch_sig_alrm(int Signal);
void wish_catch_sig_pipe(int Signal);

#endif



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