Path: utzoo!attcan!uunet!samsung!sdd.hp.com!wuarchive!mit-eddie!bloom-beacon!GATEWAY.MITRE.ORG!palmer
From: palmer@GATEWAY.MITRE.ORG
Newsgroups: comp.windows.x
Subject: Re: Need help to fix error in "xlock"
Message-ID: <9012112221.AA03683@gateway.mitre.org>
Date: 11 Dec 90 22:21:32 GMT
References: <1327@inews.intel.com>
Sender: daemon@athena.mit.edu (Mr Background)
Organization: The Internet
Lines: 48



>  Date: 11 Dec 90 18:47:23 GMT
>  From:
bu.edu!rpi!zaphod.mps.ohio-state.edu!samsung!olivea!orc!inews!mipos2.intel.com!j
poon@bloom-beacon.mit.edu
>  Organization: Intel Corporation, Santa Clara, CA
>  Subject: Need help to fix error in "xlock"
>  Message-Id: <1327@inews.intel.com>
>  Sender: xpert-request@expo.lcs.mit.edu
>  To: xpert@expo.lcs.mit.edu
>  
>  I am a navie user of X11.  But recently I built the X11R4 
>  on sun386i.  When i try to run 'xlock', it gives me the 
>  following error:
>  
>  > X Error of failed request:  BadValue (integer parameter out of range for
operation)
>  >   Major opcode of failed request:  26 (X_GrabPointer)
>  >   Minor opcode of failed request:  0
>  >   Resource id in failed request:  0xffff
>  >   Serial number of failed request:  32
>  >   Current serial number in output stream:  32
>  

This is an old error. There are several places in xlock.c where the
following line is executed :

    XGrabPointer(dsp, w, True, -1,
       GrabModeAsync, GrabModeAsync, None, cursor, CurrentTime);

The problem is the "-1" in the event_mask parameter. You should
replace this with something like :

ButtonPressMask | ButtonReleaseMask | PointerMotionMask |
ButtonMotionMask

(This is probably overkill but you get the idea.) Check the Xlib - C
Library Manual, Chap. 7.4 on "Pointer Grabbing".

------------------------------------------------------
Forrest Palmer                        (703) 883-5668
Internet Engineering Testbed Administrator
The MITRE Corp. - Washington Center
MS W425, McLean, VA 22102

palmer@mitre.org
------------------------------------------------------