26.02.2019, 11:20, "Denys Vlasenko" <[email protected]>: > On Fri, Feb 22, 2019 at 10:46 PM <[email protected]> wrote: >> From: Andrey Mazo <[email protected]> >> >> Currently, running "udhcpc -n -b" causes udhcpc to go to background and >> then exit after some time unless a lease is obtained. >> >> It's not very useful to do so >> as the calling process doesn't know >> if the lease was obtained or not anyway. >> >> The code actually tries to favor "-b" over "-n", >> but doesn't clear "-n" flag while clearing "-b" after backgrounding. >> >> So, clear "-n" flag after going into background. >> This effectively makes "-b" override "-n" completely >> and "-n -b" behave the same as "-b". >> >> This allows to override default "-n" option, passed to udhcpc by ifupdown, >> without recompiling busybox. > > To clarify: the goal is to deal with this situation: > > config IFUPDOWN_UDHCPC_CMD_OPTIONS > string "ifup udhcpc command line options" > default "-R -n" > > And %udhcpc_opts% only can _add_ options, not remove -n > > Thus, with default IFUPDOWN_UDHCPC_CMD_OPTIONS, -n is always passed? > This is the problem?
Yes, exactly. An alternative solution is obviously to recompile busybox with IFUPDOWN_UDHCPC_CMD_OPTIONS="-R -b", but it may not be always feasible (like in my case). Would changing the defaults for IFUPDOWN_UDHCPC_CMD_OPTIONS to "-R -b" be a reasonable thing to do? For example, yocto uses "-R -b" [1, 2]. If so, I can quickly cook up the patch. [1] http://git.yoctoproject.org/cgit/cgit.cgi/poky/tree/meta/recipes-core/busybox/busybox.inc#n131 [2] https://bugzilla.yoctoproject.org/show_bug.cgi?id=6339 Thank you, Andrey. _______________________________________________ busybox mailing list [email protected] http://lists.busybox.net/mailman/listinfo/busybox
