[package] base-files: kill possibly existing udhcpc instance when bringing up a dhcp...

Based on patch by Stijn Tintel. Possibly related to #7314

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@23092 3c298f89-4303-0410-b956-a3cf2f4a3e73

diff --git a/package/base-files/files/lib/network/config.sh b/package/base-files/files/lib/network/config.sh
index a5bc9ac..c948c83 100755 (executable)
--- a/package/base-files/files/lib/network/config.sh
+++ b/package/base-files/files/lib/network/config.sh
@@ -340,40 +340,32 @@ setup_interface() {
                        setup_interface_static "$iface" "$config"
                ;;
                dhcp)
-                       local lockfile="/var/lock/dhcp-$iface"
-                       lock "$lockfile"
-
-                       # prevent udhcpc from starting more than once
+                       # kill running udhcpc instance
                        local pidfile="/var/run/dhcp-${iface}.pid"
-                       local pid="$(cat "$pidfile" 2>/dev/null)"
-                       if [ -d "/proc/$pid" ] && grep -qs udhcpc "/proc/${pid}/cmdline"; then
-                               lock -u "$lockfile"
-                       else
-                               local ipaddr netmask hostname proto1 clientid broadcast
-                               config_get ipaddr "$config" ipaddr
-                               config_get netmask "$config" netmask
-                               config_get hostname "$config" hostname
-                               config_get proto1 "$config" proto
-                               config_get clientid "$config" clientid
-                               config_get_bool broadcast "$config" broadcast 0
-
-                               [ -z "$ipaddr" ] || \
-                                       $DEBUG ifconfig "$iface" "$ipaddr" ${netmask:+netmask "$netmask"}
-
-                               # don't stay running in background if dhcp is not the main proto on the interface (e.g. when using pptp)
-                               local dhcpopts
-                               [ ."$proto1" != ."$proto" ] && dhcpopts="-n -q"
-                               [ "$broadcast" = 1 ] && broadcast="-O broadcast" || broadcast=
-
-                               $DEBUG eval udhcpc -t 0 -i "$iface" \
-                                       ${ipaddr:+-r $ipaddr} \
-                                       ${hostname:+-H $hostname} \
-                                       ${clientid:+-c $clientid} \
-                                       -b -p "$pidfile" $broadcast \
-                                       ${dhcpopts:- -O rootpath -R &}
-
-                               lock -u "$lockfile"
-                       fi
+                       service_kill udhcpc "$pidfile"
+
+                       local ipaddr netmask hostname proto1 clientid broadcast
+                       config_get ipaddr "$config" ipaddr
+                       config_get netmask "$config" netmask
+                       config_get hostname "$config" hostname
+                       config_get proto1 "$config" proto
+                       config_get clientid "$config" clientid
+                       config_get_bool broadcast "$config" broadcast 0
+
+                       [ -z "$ipaddr" ] || \
+                               $DEBUG ifconfig "$iface" "$ipaddr" ${netmask:+netmask "$netmask"}
+
+                       # don't stay running in background if dhcp is not the main proto on the interface (e.g. when using pptp)
+                       local dhcpopts
+                       [ ."$proto1" != ."$proto" ] && dhcpopts="-n -q"
+                       [ "$broadcast" = 1 ] && broadcast="-O broadcast" || broadcast=
+
+                       $DEBUG eval udhcpc -t 0 -i "$iface" \
+                               ${ipaddr:+-r $ipaddr} \
+                               ${hostname:+-H $hostname} \
+                               ${clientid:+-c $clientid} \
+                               -b -p "$pidfile" $broadcast \
+                               ${dhcpopts:- -O rootpath -R &}
                ;;
                none)
                        setup_interface_none "$iface" "$config"
@@ -401,12 +393,7 @@ stop_interface_dhcp() {
        remove_dns "$config"
 
        local pidfile="/var/run/dhcp-${ifname}.pid"
-       local pid="$(cat "$pidfile" 2>/dev/null)"
-       [ -d "/proc/$pid" ] && {
-               grep -qs udhcpc "/proc/$pid/cmdline" && kill -TERM $pid && \
-                       while grep -qs udhcpc "/proc/$pid/cmdline"; do sleep 1; done
-               rm -f "$pidfile"
-       }
+       service_kill udhcpc "$pidfile"
 
        uci -P /var/state revert "network.$config"
 }