[sr #107464] Secure Connections on AIX using non blocking socket

Bjørn Christensen bhc at insight.dk
Thu Aug 26 13:31:52 CEST 2010

Hello Nikos

From www.opengroup.org

Upon successful completion, recv() shall return the length of the message in bytes. If no messages are available to be received and the peer has performed an orderly shutdown, recv() shall return 0. Otherwise, -1 shall be returned and errno set to indicate the error

This means that the AIX have a problem.

The specification says that errno should be set when returning -1 from recv. This means that the error can not be fatal.

What happens if I let _gnutls_read return 0 in this case??

Returning GNUTLS_E_AGAIN makes the handshake complete


-----Original Message-----
From: n.mavrogiannopoulos at gmail.com [mailto:n.mavrogiannopoulos at gmail.com] On Behalf Of Nikos Mavrogiannopoulos
Sent: 26. august 2010 11:53
To: Bjørn Christensen
Cc: gnutls-devel at gnu.org
Subject: Re: [sr #107464] Secure Connections on AIX using non blocking socket

2010/8/26 Bjørn Christensen <bhc at insight.dk>:
> Hello Nikos!
> The code in _gnutls_read fires a gnutls_assert if  recv return -1 and the errno is different from EAGAIN and EINTR. _gnutls_read function returns GNUTLS_E_PULL_ERROR.
> I think the assertion leads to the HandShake being terminated.
> In the _gnutls_read when recv returns -1 and no errno it is treated as a fatal error assert and GNUTLS_E_PULL_ERROR.
> Mayby is would be enough to not return the GNUTLS_E_PULL_ERROR if the errno is zero?

This doesn't sound correct. It will break systems where recv() returns
-1 for a fatal error without errno.


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