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Re: [Bug-wget] gnutls_handshake can return GNUTLS_E_INTERRUPTED

From: Daniel Stenberg
Subject: Re: [Bug-wget] gnutls_handshake can return GNUTLS_E_INTERRUPTED
Date: Thu, 30 Jun 2016 17:18:36 +0200 (CEST)
User-agent: Alpine 2.20 (DEB 67 2015-01-07)

On Thu, 30 Jun 2016, Tim Ruehsen wrote:

I believe, we already handle that case. If GNUTLS_E_INTERRUPTED occurs, we restart the loop and re-enter gnutls_handshake(). This happens for all non-fatal errors.

Right, but then it won't wait for the socket and just busy-loop. The gnutls_record_get_direction man page[*] seems to suggest that waiting for the socket is the appropriate way:

 This function provides information about the internals of the record protocol
 and is only useful if a prior gnutls function call (e.g. gnutls_handshake())
 was interrupted for some reason, that is, if a function returned
 GNUTLS_E_INTERRUPTED or GNUTLS_E_AGAIN. In such a case, you might want to
 call select() or poll() before calling the interrupted gnutls function again

[*] = http://linux.die.net/man/3/gnutls_record_get_direction


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