No apparent way to read both main channel and error channel

[d3zd3z]

Aside from setting a short timeout, I don't see any way of reading from multiple channels. Programs will often write to both stdout and stderr, and it'd be nice to be able to capture both. The channel and/or stream aren't Sync so threads can't be used, and there doesn't seem to be any way of blocking on multiple streams in order to multiplex them.

[alexcrichton]

Unfortunately it looks like this is actually a limitation of libssh2 itself. These methods in libssh2 aren't synchronized (e.g. no mutexes) so it's not safe to concurrently call the underlying libssh2_channel_read_ex function. I think the way libssh2 expects multiplexing cases like this to be handled is to set the sockets into nonblocking mode and then handle the errors via select. That definitely seems a little painful, but unfortunately I don't think there's much else that can be done in this regard :(.

Perhaps I can investigate a binding via mio using ssh2-rs to provide nonblocking support, but that may be a bit of aways off!

[d3zd3z]

Thanks, fortunately, I think my use case either prints to stdout or stderr, and the prints to stderr won't overflow any buffers, so I can just read stderr after exhausting stdout.

At least rust made it obvious that it wasn't safe to use the Stream in another thread :-)