Subject: Re: libssh2_sftp_init() blocks and does not return

Re: libssh2_sftp_init() blocks and does not return

From: Daniel Stenberg <>
Date: Fri, 20 Mar 2009 19:56:18 +0100 (CET)

On Fri, 20 Mar 2009, Heiner Steven wrote:

>> I've done quite a lot of tests with non-blocking and I've not seen this,
>> and I've also got reports from others who've done the libcurl-based (~30)
>> tests without experiencing this. It might indicate that the problem happens
>> only in more specific situations, like with a particular server on a
>> particular OS or something else...
> This could be the case, but on the other hand version 0.18 and 1.0 both run
> without problems on the same system.

What other alternatives can you think of? Did you try this against other SFTP

> I wonder what the error code "ERESTARTSYS" means, which recvfrom() returns
> on the SIGQUIT signal.

I'm personally more stunned by the fact it blocks in the first place. Why does
it do so when set non-blocking?

Anyway, can you build libssh2 debug-enabled and call libssh2_trace(~0) before
the libssh2_sftp_init() call to give us a dump of debug info to look at?

Apps built with the Adobe(R) Flex(R) framework and Flex Builder(TM) are
powering Web 2.0 with engaging, cross-platform capabilities. Quickly and
easily build your RIAs with Flex Builder, the Eclipse(TM)based development
software that enables intelligent coding and step-through debugging.
Download the free 60 day trial.
libssh2-devel mailing list
Received on 2009-03-20