[Bug 8601] New: ifdown doesn't work if dhcp client is not running

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=8601

            Bug ID: 8601
           Summary: ifdown doesn't work if dhcp client is not running
           Product: Busybox
           Version: 1.24.x
          Hardware: All
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P5
         Component: Networking
          Assignee: unassigned at busybox.net
          Reporter: d.zanni at signal-elettronica.it
                CC: busybox-cvs at busybox.net

I have configured the wlan0 interface to work with wpa_supplicant and udhcpc.
In case of wrong wireless key, the dhcp client terminate so when I try to force
the shutdown of the interface, the command ifdown exit with status 1. And then
the daemon wpa_supplicant still active because the scripts inside
if-post-down.d aren't executed.

To solve the problem in file ifupdown.c I have modified the command line for
stopping the dhcp client. In this case if the pid file is not present the kill
command is not executed and the return value is correct. The modification is
for both external dhcpc and udhcpc

test ! -f /var/run/udhcpc.%iface%.pid || kill `cat /var/run/udhcpc.%iface%.pid`
2>/dev/null

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