nixpkgs-suyu/system/etc/dhclient-exit-hooks

echo "$reason" >> /tmp/dhcp-exit
echo "$exit_status" >> /tmp/dhcp-exit

if test "$reason" = BOUND -o "$reason" = REBOOT; then
    @glibc@/sbin/nscd --invalidate hosts
    @upstart@/sbin/initctl emit ip-up
fi

if test "$reason" = EXPIRE -o "$reason" = RELEASE; then
    @upstart@/sbin/initctl emit ip-down
fi
* Emit ip-up / ip-down events when we get or lose a DHCP lease. * ntpd: start on ip-up, not when the network interfaces are up, otherwise it will fail because it can't find any servers right away. svn path=/nixos/trunk/; revision=7461 2006-12-22 18:28:25 +01:00			`echo "$reason" >> /tmp/dhcp-exit`
			`echo "$exit_status" >> /tmp/dhcp-exit`

			`if test "$reason" = BOUND -o "$reason" = REBOOT; then`
* Flush the nscd hosts table after we've acquired an DHCP lease to prevent problems with negative caching (NIXOS-45). svn path=/nixos/trunk/; revision=7763 2007-01-23 11:22:00 +01:00			`@glibc@/sbin/nscd --invalidate hosts`
* Emit ip-up / ip-down events when we get or lose a DHCP lease. * ntpd: start on ip-up, not when the network interfaces are up, otherwise it will fail because it can't find any servers right away. svn path=/nixos/trunk/; revision=7461 2006-12-22 18:28:25 +01:00			`@upstart@/sbin/initctl emit ip-up`
			`fi`

			`if test "$reason" = EXPIRE -o "$reason" = RELEASE; then`
			`@upstart@/sbin/initctl emit ip-down`
			`fi`