[Bug 11691] New: "udhcpc -n -b" still exits after backgrounding on no lease

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=11691

            Bug ID: 11691
           Summary: "udhcpc -n -b" still exits after backgrounding on no
                    lease
           Product: Busybox
           Version: 1.30.x
          Hardware: All
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P5
         Component: Networking
          Assignee: unassigned at busybox.net
          Reporter: ahippo at yandex.com
                CC: busybox-cvs at busybox.net
  Target Milestone: ---

Running "udhcpc -n -b" causes udhcpc to go into background and then exit after
some timeout unless a lease is obtained.
It's probably arguable what's the proper behavior is,
but I expect "-b" switch to override "-n" switch.

A particular use-case is managing udhcpc from ifupdown.
Currently, ifupdown passes "-n" to udhcpc by default (unless compiled with
other options), and there is no way to override this without recompiling
busybox.

It looks like, the code actually tries to favor "-b" over "-n", but doesn't
clear "-n" flag while clearing "-b" before backgrounding.

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