Re: bin/47129: mouse won't move diagonally in i386 X11 on amd64 kernel

[David Laight <david%l8s.co.uk@localhost>]

The following reply was made to PR bin/47129; it has been noted by GNATS.

From: David Laight <david%l8s.co.uk@localhost>
To: gnats-bugs%NetBSD.org@localhost
Cc: gnats-admin%netbsd.org@localhost, netbsd-bugs%netbsd.org@localhost, 
apb%cequrux.com@localhost
Subject: Re: bin/47129: mouse won't move diagonally in i386 X11 on amd64 kernel
Date: Sun, 28 Oct 2012 15:10:28 +0000

 On Sat, Oct 27, 2012 at 05:45:03PM +0000, Alan Barrett wrote:
 >  
 >  This problem is traceable to the change in struct timespec between i386
 >  and amd64.  struct timespec is embedded in struct wscons_event, which
 >  is used for data read from the mouse.  struct timespec contains "long
 >  tv_nsec", which is 32 bits on i386, and 64 bits on amd64.  (Defining
 >  tv_nsec as long doesn't really make sense, because there is no need to
 >  represent values larger than 1000000000, so 32 bits would have been
 >  plenty, but POSIX specifies long and NetBSD apparently chose not to
 >  deviate from POSIX here.)
 
 That wouldn't have helped, the 'seconds' part is 64bit, so the amd64
 timespec would contain 4 bytes of padding - total 16 bytes.
 The i386 one is 12 bytes.
 
        David
 
 -- 
 David Laight: david%l8s.co.uk@localhost