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Re: io_select support for netfs

From: Thomas Bushnell, BSG
Subject: Re: io_select support for netfs
Date: 28 Jul 2004 13:53:47 -0700
User-agent: Gnus/5.09 (Gnus v5.9.0) Emacs/21.3

Marco Gerards <metgerards@student.han.nl> writes:

> In libnetfs/mutations.h the macro IO_SELECT_REPLY_PORT is not
> defined.  That means that the netfs_S_io_select function does not get
> the reply port.
> If someone wants to override netfs_S_io_select, the function simply
> won't work correctly because the reply port is required.  The patch
> for the console client I sent in yesterday overrides netfs_S_io_select
> so this change is required in order to make it work correctly.

Be very careful in general with select on network thingies.  This
doesn't apply to your use, but I want it on the record.  To return
select true means that you can immediately do I/O with no waiting.

That means that you certainly already have the data to read here on
the local computer, you cannot reliably expect to read something over
a network, ever.


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