Re: [9fans] accept in dial(2)

[Russ Cox <russcox@gmail.com>]

[I forwarded geoff's original post to Dave Presotto,
who is not reading 9fans as vigorously as usual.
I'm posting this because his gmail account is not
authorized to send to 9fans.]

From: David Presotto
To: 9fans@cse.psu.edu
Date: Tue, 17 Aug 2004 13:06:18 -0700
Subject: Fwd: [9fans] accept in dial(2)

I'm indeed only reading 9fans sporadically.

The fd used should indeed be the one returned
by listen.  aux/listen et al are wrong.  However,
since we shut off datakit, it really hasn't mattered
because we currently don't have the ability to reject
IP calls.  Should someone change that, listen et al
should be changed to use nctl.

On Mon, 16 Aug 2004 20:30:48 -0700, geoff@collyer.net <geoff@collyer.net> wrote:
> There seems to be some confusion about which file descriptor
> accept should take as its first argument: the one announce
> returned, the one listen returned, or it doesn't matter.
> A quick kernel grep suggests that only port/devsdp.c still
> recognises the word "accept", per the comment
>
>         write(ctl, buf, n); /* ignore return value, network might not need accepts */
>
> at /sys/src/libc/9sys/announce.c:148.  dial(2) says
> ``Accept accepts a call received by listen'', which
> isn't completely clear, but the example given uses
> the fd returned by listen, which makes sense to me.
> On the other hand, listen, listen1 and tftpd use the
> fd returned by announce.
>
> Does anybody know which fd accept should take, and if it
> matters?
>