Add a hack to fix the dhcpcd rc.d script to work with a single

interface specified in dhcpcd_flags in rc.conf(5).
Fixes PR bin/43490

etc/rc.d/dhcpcd

@@ -9,7 +9,27 @@ $_rc_subr_loaded . /etc/rc.subr
 name=dhcpcd
 rcvar=$name
 command=/sbin/$name
-pidfile=/var/run/$name.pid
 
 load_rc_config $name
+
+# If the last argument to dhcpcd is a valid interface and the prior argument
+# is not then dhcpcd will start on one interface only and create a pidfile
+# based on the interface name. See PR bin/43490.
+if [ -n "$flags" ]; then
+	myflags=$flags
+else
+	eval myflags=\$${name}_flags
+fi
+ifname="${myflags##* }"
+myflags="${myflags%% $ifname}"
+last_flag="${myflags##* }"
+if /sbin/ifconfig "$ifname" >/dev/null 2>&1 && 
+    ! /sbin/ifconfig "$last_flag" >/dev/null 2>&1
+then
+	pidfile=/var/run/$name-"$ifname".pid
+else
+	pidfile=/var/run/$name.pid
+fi
+unset myflags ifname last_flag
+
 run_rc_command "$1"