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/* The initlock routine initializes the locking mechanism and all atoms */
/* needed for Figaro/PGPLOT applications to communicate with the display */
/* server. */
/* Return Values: */
/* ALREADY_RUNNING A copy of the display server is already running on */
/* the requested screen. */
/* FAIL The initialization failed for some reason. */
/* SUCCEED Everything went fine. */
/* Sam Southard, Jr. */
/* Created: 01-Nov-1990 */
/* Modification History: */
/* 10-May-1991 SNS/CIT Modified for use in the Lick Xvideo program */
/* 15-Aug-1991 SNS/CIT No longer includes hooks for Xvideo */
/* 6-Sep-1991 SNS/CIT Changes from SSL::TENNANT included */
/* 8-Oct-1991 SNS/CIT Globals now in globals.h */
/* 14-Feb-1992 SNS/CIT Now uses the id resource to allow multiple figdisps */
/* 14-Apr-1992 SNS/CIT Now compiles under VMS. */
/* The system include files */
#include <stdio.h>
/* The X windows include files */
#include <X11/Xlib.h>
/* The program include files */
#include "commands.h"
#include "figdisp.h"
#include "globals.h"
#include "messages.h"
int initlock()
{
char lockatomstr[MAXSTRLEN]; /* the name of the locking atom */
/* here we check to make sure that no other copy of this */
/* program is running on the selected display. */
(void)sprintf(&lockatomstr[0],"%s_%d_%d",NAME_PROG,screen,res.id);
if ((lock=XInternAtom(display,&lockatomstr[0],False)) == None)
{
(void)fprintf(stderr,MSG_BADLOCKATOM);
return(FAIL);
}
/* if the atom is owned by someone other than this program */
/* than another copy of this program is running and we */
/* should go away */
if (XGetSelectionOwner(display,lock) != None)
{ /* if the atom is owned, another display process is running */
(void)fprintf(stderr,MSG_ALREADYRUNNING);
return(ALREADY_RUNNING);
}
/* now we set up the atom for incremental transfers */
(void)sprintf(&lockatomstr[0],"%s_%d_%d",NAME_INCRATOM,screen,res.id);
if ((incrtype=XInternAtom(display,&lockatomstr[0],False)) == None)
{
(void)fprintf(stderr,MSG_BADINCRATOM);
return(FAIL);
}
/* now we set up the atom for data */
(void)sprintf(&lockatomstr[0],"%s_%d_%d",NAME_DATAATOM,screen,res.id);
if ((dataatom=XInternAtom(display,&lockatomstr[0],False)) == None)
{
(void)fprintf(stderr,MSG_BADDATAATOM);
return(FAIL);
}
/* now we set up the atom to use for selections */
(void)sprintf(&lockatomstr[0],"%s_%d_%d",NAME_SELATOM,screen,res.id);
if ((selatom=XInternAtom(display,&lockatomstr[0],False)) == None)
{
(void)fprintf(stderr,MSG_BADSELATOM);
return(FAIL);
}
return(SUCCEED);
}
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