Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!uunet!snorkelwacker!bloom-beacon!ncd.COM!dimick
From: dimick@ncd.COM (Kim Dimick)
Newsgroups: comp.windows.x
Subject: Re: locking X terminals
Message-ID: <9009201527.AA03324@bryant.com>
Date: 20 Sep 90 15:27:47 GMT
References: <13077@june.cs.washington.edu>
Sender: root@athena.mit.edu (Wizard A. Root)
Organization: The Internet
Lines: 94



>xlock doesn't work on my NCD 16 and 17c X terminals.  Is this because
>	1) I need to give some arguments to xlock.
>	2) The server software from NCD doesn't support locking the screen.
>	3) I need something other than xlock.
>	4) It's infeasible with X11R4.
>	5) You tell me.
>


I think you are running in to a difference between running xlock on a work
station where a xhost list is save locally and running it on a X Display
Station that obtains its xhost list from a remote host via a remote
configuration file.

The main problem is xlock does the equivalent to a xhost - and once the xhost -
is performed the X Display Station that does not keep it xhost list locally
will not be able to perform the xhost + when the user tries to return to their
work. 
So the X Display Station will not accept any more connections and the user will
get a error similar to this 'Client is not authorized to connect to Server'.

I have made some changes to the X11R4 xlock source so it will work correctly on
the NCDs and other X Display Station. I have attached the diffs'.



------------------Imakefile differences----------------------


19c19
<        CDEBUGFLAGS = -O -DNDS
---
>        CDEBUGFLAGS = -g


----------------------xlock.c differences---------------------

179,180c179
< /* #define DEFAULT_FONTNAME        "LucidaSans-24" */
< #define DEFAULT_FONTNAME	"*-courier-bold-r-normal--14-*"
---
> #define DEFAULT_FONTNAME	"LucidaSans-24"
228c227
< /*void*/
---
> void
232d230
< #ifndef NDS
234,236c232,233
< /*    XRemoveHosts(dsp, XHosts, HostAccessCount);*/
< /*    XEnableAccessControl(dsp);*/
< #endif
---
>     XRemoveHosts(dsp, XHosts, HostAccessCount);
>     XEnableAccessControl(dsp);
239c236
< /*void*/
---
> void
243d239
< #ifndef NDS
248d243
< #endif
252c247
< /*void*/
---
> void
285d279
<     XSetScreenSaver(dsp, timeout, interval, blanking, exposures);
613d606
< #ifndef NDS
622d614
< #endif
753c745
< /*    XSetScreenSaver(dsp, 0, 0, 0, 0);*/	/* disable screen saver */
---
>     XSetScreenSaver(dsp, 0, 0, 0, 0);	/* disable screen saver */
757c749
< /*	XGrabHosts(dsp);*/
---
> 	XGrabHosts(dsp);



--------------------life.c differences---------------------


433d432
<     /*
435,436d433
<     */
<     sleep(delay * 1000);