bin/98577: the link check by dhclient slows down booting on a laptop

[Nick Hibma]

>Number:         98577
>Category:       bin
>Synopsis:       the link check by dhclient slows down booting on a laptop
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          change-request
>Submitter-Id:   current-users
>Arrival-Date:   Tue Jun 06 05:30:17 GMT 2006
>Closed-Date:
>Last-Modified:
>Originator:     Nick Hibma
>Release:        FreeBSD 6.1-RC i386
>Organization:
>Environment:
System: FreeBSD hind.van-laarhoven.org 6.1-RC FreeBSD 6.1-RC #15: Tue May 30 12:01:11 CEST 2006 root at hind.van-laarhoven.org:/usr/src/sys/i386/compile/HIND i386

>Description:

Dhclient is nowadays waiting for the link to come up before continuing. That
makes the -b (become a daemon immediately) less useful. Ctrl-C at that point
makes the whole rc.d script fail.

>How-To-Repeat:

Set
	background_dhclient="YES"
in rc.conf, remove ethernet plug (I assume that it is a rl0 iface) and run
	/etc/rc.d/netif restart rl0
Notice the long wait.

>Fix:

Move the checking for link (/usr/src/sbin/dhclient/dhclient.c) after the first
go_daemon case. Problems might be chroot and fork_privchild. Untested.
>Release-Note:
>Audit-Trail:
>Unformatted: