openssh unix dev - Jul 2013 - connection_in and connection_out

Hi, 


I'm a newbie to openssh and was trying to read the source code recently.
Could anyone tell me why in sshd the connection_in and connection_out are the
same(seems to be integer 3 in my machine).
connection_in is used in process_input(readset), and connection_out is used in
process_output(writeset);
But how does it work if it tries to read and write from the same file
descriptor?


/Bob

On Wed, 10 Jul 2013, Bob Chen wrote:
> Hi, 
> 
> 
> I'm a newbie to openssh and was trying to read the source code
> recently. Could anyone tell me why in sshd the connection_in and
> connection_out are the same(seems to be integer 3 in my machine).
> connection_in is used in process_input(readset), and connection_out is
> used in process_output(writeset); But how does it work if it tries to
> read and write from the same file descriptor?
sockets are bidirectional. If the connection was via a proxy command then they
would point to different file descriptors.

-d