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Date: Wed, 26 Aug 2009 00:20:57 -0400
From: "Mikhail T." <mi+thun@aldan.algebra.com>
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Subject: semantics of fcntl() with l_len being 0
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Hello!

I'm curious, whether a file, that's locked (via fcntl) with l_start and
l_len being 0 is supposed to be appendable...

I would think so, but I notice, that when spamprobe (see mail/spamprobe)
chews on my spam mailbox, I can not append a new piece of spam to the
file -- my imap-server is waiting for spamprobe to finish.

The fcntl(2) says: ``len = 0 means until end of file''. Is that ``until
the end of file AT THE TIME OF LOCKING'' or simply ``no other lock until
we are done''? Thanks. Yours,

    -mi