kern/38562: FIOSETOWN on ttys seems broken

[yamt%mwd.biglobe.ne.jp@localhost]

>Number:         38562
>Category:       kern
>Synopsis:       FIOSETOWN on ttys seems broken
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Fri May 02 09:00:00 +0000 2008
>Originator:     YAMAMOTO Takashi <yamt%mwd.biglobe.ne.jp@localhost>
>Release:        NetBSD 4.99.62
>Organization:
        
>Environment:
        
        
Architecture: i386
Machine: i386
>Description:
        - FIOSETOWN on a tty always associate a pgrp, even if a process is
          specified by a user.
        
        - FIOSETOWN on a tty stores a pgrp pointer to t_pgrp.
          when pgrp disappears, the pointer will be left stale.
>How-To-Repeat:
        
>Fix:
        stop abusing t_pgrp for FIOSETOWN.

>Unformatted: