[Bug 9231] less should fall back to stdout fd

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=9231

--- Comment #1 from Denys Vlasenko <vda.linux at googlemail.com> ---
(In reply to Mike Frysinger from comment #0)
> except this doesn't make sense -- the fd passed to it is a dup from a parent, so any changes busybox makes to the file status flags via fcntl of its copy doesn't impact other processes.  when it exits, its fd simply goes away.

O_NONBLOCK _is_ shared across processes. There is only one flag which isn't -
O_CLOEXEC.
In fcntl language, F_SETFL flags are shared, F_SETFD ones (of which there is
only one flag) are not.

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