Re: [rfc] Allow xfer_partial to signal EOF out of band

[Mark Kettenis <mark.kettenis@xs4all.nl>]

> Date: Wed, 21 Jun 2006 23:36:09 -0400
> From: Daniel Jacobowitz <drow@false.org>
> 
> This patch adds a mechanism for to_xfer_partial to signal that it's done.
> I didn't implement the new mechanism for any other targets besides remote;
> it could easily be done for e.g. procfs_read_auxv, but the turnaround time
> is such that it's not a big deal either way.  For the remote protocol,
> where there's an extra round trip to the remote link, I set *no_more if
> the target tells me to.

I don't like this at all.  I think target_read_partial already has
enough arguments.  And having read-like function calls return zero on
EOF is a well-established practice.

> Any comments on this?  Otherwise, I'll commit it after qXfer:auxv:read. 
> This is the patch which actually saves one packet whenever a remote object
> is transferred.

Does that really impact performance?  If it does, I think you should
add some state to the remote protocol and use that to prevent it from
sending a packet.

Mark