/*----------------------------------------------------------------------+|									||  Copyright (c) 1990 Entropic Research Laboratory, Inc.		||									||  Permission to use, copy, modify, distribute, and sell this software	||  and its documentation for any purpose is hereby granted without	||  fee, provided that the above copyright notice appear in all copies	||  and that both that copyright notice and this permission notice	||  appear in supporting documentation.  Neither Entropic Research	||  Laboratory nor the author makes any representations about the	||  suitability of this software for any purpose.  It is provided "as	||  is" without express or implied warranty.				||									||  ENTROPIC RESEARCH LABORATORY AND THE AUTHOR DISCLAIM ALL WARRANTIES	||  WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF	||  MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL ENTROPIC RESEARCH	||  LABORATORY OR THE AUTHOR BE LIABLE FOR ANY SPECIAL, INDIRECT, OR	||  CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS	||  OF USE, DATA, OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,		||  NEGLIGENCE, OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN		||  CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.		||									|+-----------------------------------------------------------------------+|									||  Program:  next_slide							||									||  This program causes the program xloadimage, if invoked with the	||  -prog_slideshow option, to advance to the next image.  The two	||  programs communicate by using a one-byte property on the root	||  window as a semaphore.						||									||  Module:  next_slide.c						||									||  Main program.							||									||  Rod Johnson, Entropic Research Laboratory, Inc.  90/09/25		||									|+----------------------------------------------------------------------*/#ifdef SCCS    static char *sccs_id = "@(#)next_slide.c	1.2  11/8/90";#endifstatic char *Copyright =	"Copyright (c) 1990 Entropic Research Laboratory, Inc.";#include <stdio.h>#include <X11/Xlib.h>#include <X11/Xutil.h>#include "ready.h"#define LIM	60main(argc, argv)    int		argc;    char	**argv;{    Display	*disp;    int		scrn;    int		delay;    int		lim;    switch (argc)    {    case 1:	lim = LIM;	break;    case 2:	lim = atoi(argv[1]);	break;    default:	fprintf(stderr, "Usage: next_slide [max_wait]\n");	exit(1);	break;    }    disp = XOpenDisplay((char *) NULL);    if (!disp)    {	fprintf(stderr, "Can't open display.\n");	exit(1);    }    scrn = DefaultScreen(disp);    intern_ready(disp);    if (lim <= 0)    {	set_ready(disp, scrn, RDY_BUSY);	exit(0);    }    for (delay = 0; delay < lim; )    {	switch (get_ready(disp, scrn))	{	case RDY_BUSY:	    delay++;	    break;	case RDY_READY:	    set_ready(disp, scrn, RDY_BUSY);	    exit(0);	    break;	case RDY_PAUSE:	    break;	case RDY_QUIT:	    set_ready(disp, scrn, RDY_BUSY);	    exit(1);	}	sleep(1);    }    fprintf(stderr, "xloadimage timed out.\n");    exit(1);}