/******************************************************************************
 *
 * PROJECT: Carnegie Mellon Planetary Rover Project
 *          Task Control Architecture 
 * 
 * (c) Copyright 1991 Christopher Fedor and Reid Simmons.  All rights reserved.
 * 
 * MODULE: communications
 *
 * FILE: globalVar.c
 *
 * ABSTRACT:
 * 
 * Provides a system global variables.
 *
 * Copyright (c) 2008, Carnegie Mellon University
 *     This software is distributed under the terms of the 
 *     Simplified BSD License (see ipc/LICENSE.TXT)
 *
 * REVISION HISTORY
 *
 * $Log: globalVar.h,v $
 * Revision 2.3  2009/01/12 15:54:56  reids
 * Added BSD Open Source license info
 *
 * Revision 2.2  2000/07/03 17:03:24  hersh
 * Removed all instances of "tca" in symbols and messages, plus changed
 * the names of all other symbols which conflicted with TCA.  This new
 * version of IPC should be able to interoperate TCA fully.  Client
 * programs can now link to both tca and ipc.
 *
 * Revision 2.1.1.1  1999/11/23 19:07:34  reids
 * Putting IPC Version 2.9.0 under local (CMU) CVS control.
 *
 * Revision 1.1  1996/05/09 01:01:28  reids
 * Moved all the X_IPC files over to the IPC directory.
 * Fixed problem with sending NULL data.
 * Added function IPC_setCapacity.
 * VxWorks m68k version released.
 *
 * Revision 1.1  1996/03/03 04:31:34  reids
 * First release of IPC files.  X_IPC code (8.5), modified to support NM-DS1 IPC.
 *
 * Revision 1.4  1995/04/04  19:42:25  rich
 * Added sgi support.
 * Split low level com routines out to be used in devUtils.
 * Improved some error messages.
 * Added central switch to default to direct connections.  Does not work yet.
 * Fixed the vectorization code.
 *
 * Revision 1.3  1995/03/30  15:43:13  rich
 * DBMALLOC works.  To use "gmake -k -w DBMALLOC=DBMALLOC install"
 * Added simple list of strings data structure that can be passed via x_ipc
 * messages.
 * Use the string list to maintain a global variable of messages with taps.
 * Tapped messages are not sent via direct connections.
 * Implemented code to vectorize data to be sent so that it does not have
 * to be copied.  Currently, only flat, packed data structures are
 * vectored.  This can now be easily extended.
 * Changed Boolean -> BOOLEAN for consistency and to avoid conflicts with x11.
 * Fixed bug were central would try and free the "***New Module***" and
 * "*** Unkown Host***" strings when a module crashed on startup.
 * Fixed a bug reported by Jay Gowdy where the code to find the size of a
 * variable lenght array would access already freed data when called from
 * x_ipcFreeData.
 *
 * Revision 1.2  1995/03/28  01:14:41  rich
 * - Added ability to log data with direct connections.  Also fixed some
 * problems with global variables. It now uses broadcasts for watching variables.
 * - Added preliminary memory recovery routines to handle out of memory
 * conditions.  It currently purges items from resource queues.  Needs to
 * be tested.
 * - If the CENTRALHOST environment variable is not set, try the current
 * host.
 * - Fixed a problem with central registered messages that caused the parsed
 * formatters to be lost.
 * - Added const declarations where needed to the prototypes in x_ipc.h.
 * - x_ipcGetConnections: Get the fd_set.  Needed for direct connections.
 * - Added x_ipcExecute and x_ipcExecuteWithConstraints.  Can "execute" a goal
 *   or command.
 * - x_ipcPreloadMessage: Preload the definition of a message from the
 *   central server.
 *
 * Revision 1.1  1994/05/17  23:16:02  rich
 * Added global variables and associated routines.
 * Added some error checking.  The central connection is now set to -1
 * rather than zero to prevent x_ipc messages from being send to stdout.
 * Now compiles on the sgi machines.  Still need to have the endian and
 * alignment figured out automatically.
 *
 *
 * $Revision: 2.3 $
 * $Date: 2009/01/12 15:54:56 $
 * $Author: reids $
 *
 *****************************************************************************/


#ifndef INCglobalVar
#define INCglobalVar

void globalVarInitialize(void);
void centralSetVar(const char *varName, const char *value);
void centralRegisterVar(const char *varName, const char *format);
void centralIgnoreVarLogging(const char *varName);

#endif /* INCglobalVar */