[2732] in linux-net channel archive
Re: tcp.c, FIONREAD bug?
daemon@ATHENA.MIT.EDU (Alan Cox)
Mon Apr 29 19:27:17 1996
From: Alan Cox <alan@cymru.net>
To: stefan@iandi.demon.co.uk (Stefan Magdalinski)
Date: Mon, 29 Apr 1996 11:19:46 +0100 (BST)
Cc: LINUX-NET@vger.rutgers.edu
In-Reply-To: <Pine.LNX.3.91.960429003704.128A-100000@iandi.demon.co.uk> from "Stefan Magdalinski" at Apr 29, 96 00:38:24 am
> case TIOCINQ:
> #ifdef FIXME /* FIXME: */
> case FIONREAD:
> #endif
Thats ok.. its just naming
> {
> unsigned long amount;
>
> if (sk->state == TCP_LISTEN)
> return(-EINVAL);
A listening socket doesnt have bytes queued so the request is silly
> lock_sock(sk);
Stop people changing it
> amount = tcp_readable(sk);
Actually work out what is there to read - that is the routine to check
> release_sock(sk);
Undo the lock sock
> err=verify_area(VERIFY_WRITE,(void *)arg,
> sizeof(int));
> if(err)
> return err;
Check we can write to user space here
> put_user(amount, (int *)arg);
> return(0);
Stuff it in and return
Alan
