Switching between blocking and non-blocking mode

[James Wrigley <james@xxxxxxxxxxxxxx>]

Hi there,
I nominally use LibSSH in non-blocking mode, however in some cases I want
to perform SFTP operations. Because the SFTP API does not support
non-blocking mode right now my approach is to switch the session to
blocking mode, do the SFTP operation, and then switch back to non-blocking
mode. In my application I've noticed that this can sometimes lead to
sftp_new() just failing for some reason. I haven't started debugging this
properly, but my initial question is basically, is it safe to switch a
session from blocking to non-blocking mode and back like this? Or is a
session meant to be in a single mode for its entire lifetime?

For context I'm using LibSSH in Julia, hence the session usually needs to
be in non-blocking mode to play nicely with Julia's event loop.

Thanks,
James