Re: [Qemu-devel] [PATCHv2] Fix virtio-console failure on unconnected pty

[Amit Shah]

On (Thu) 29 Dec 2011 [15:32:14], Christian Borntraeger wrote:
> > port->throttled never becomes true for qemu.  
> 
> Huh? What did I miss below?
> 
>             if (ret == -EAGAIN || (ret >= 0 && ret < buf_size)) {
>                 virtio_serial_throttle_port(port, true);

Ah; I see what's happening.  pty_chr_write() returns 0 if a client
isn't yet connected.

This is different from the buggy tcp_chr_write() code, which just
returns 'len', i.e. a successful write.  And since I've only tested
with tcp/unix sockets, I couldn't see why throttling could get
enabled.

                Amit