Re: Reading data from a file descriptor

[<tomas@tuxteam.de>]

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On Tue, Nov 17, 2015 at 01:55:17PM +0000, Chris Vine wrote:
> On Tue, 17 Nov 2015 13:52:21 +0100
> <tomas@tuxteam.de> wrote:
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> > On Tue, Nov 17, 2015 at 12:59:56PM +0000, Chris Vine wrote:
> > > On Tue, 17 Nov 2015 10:53:19 +0100  
> > 
> > [...]
> > 
> > > guile's R6RS implementation has get-bytevector-some, which will do
> > > that for you, with unix-read-like behaviour.  
> > 
> > Thank you a thousand. You made me happy :-)
> 
> I suppose it is worth adding that it might not be optimally efficient
> for all uses, as there is no get-bytevector-some! procedure which
> modifies an existing bytevector and takes a maximum length value.  I
> guess it is a matter of 'suck it and see', efficiency-wise.
> 
> If you are sending/receiving binary packets, it might be better to make
> them of fixed size and use get-bytevector-n!.  (Unfortunately,
> get-bytevector-n! does block until n is fulfilled according to R6RS:
> "The get-bytevector-n! procedure reads from binary-input-port, blocking
> as necessary, until count bytes are available from binary-input-port or
> until an end of file is reached".)

:-(

As I noted before, it's a while since I attempted that. I was looking
for an equivalent of read(2) and write(2): simple, efficient, easy to
understand semantics (if you discount the EOF problem for now).

Perhaps the limitations you mention above steered me towards
read-string!/partial and friends, then.

Thanks & regards
- -- tomás
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