misc/150175: misc/dahdi rc script should not allow it to stop while in use

[Kalidarn]

>Number:         150175
>Category:       misc
>Synopsis:       misc/dahdi rc script should not allow it to stop while in use
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Wed Sep 01 05:50:01 UTC 2010
>Closed-Date:
>Last-Modified:
>Originator:     Kalidarn
>Release:        FreeBSD 8.1-RELEASE
>Organization:
>Environment:
FreeBSD localhost.local 8.1-RELEASE FreeBSD 8.1-RELEASE #0: Mon Jul 19 02:36:49 UTC 2010 root at mason.cse.buffalo.edu:/usr/obj/usr/src/sys/GENERIC  amd64
>Description:
I believe there should be some error handling in the rc script for dahdi to not allow a user to stop it if other things, like asterisk are using the devices ie /dev/dahdi/x

If a user does stop dahdi without stopping other services, the system will kernel panic.
>How-To-Repeat:
Stop dahdi before stopping asterisk.
>Fix:
Check to see if other processes using dahdi are running.

>Release-Note:
>Audit-Trail:
>Unformatted: