how to know if socket is still connected

[Grant Edwards]

On 2006-07-16, nephish at xit.net <nephish at xit.net> wrote:

> serverhost = 'xxx.xxx.xxx.xxx'
> serverport = 9520
> aeris_sockobj = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
> aeris_sockobj.connect((serverhost,serverport))
>
> while 1:
>     do this or that with socket,
>     send and receive info.
>     yadda yadda yadda
>
> works well, but sometimes the server drops the connection. so,
> what i need is something that will let me know if the
> connection is still ok, if not will reconnect.

If the server has closed the connection, then a recv() on the
socket will return an empty string "", and a send() on the
socket will raise an exception.

> what i thought, since it only lets you connect on a certain
> port one at a time, that i could use a try-except to connect
> every time, if it could not connect (because it already is)
> then i would just continue on. But if it is not connected, it
> would reconnect. that is what brings me here. Seems like it
> would work, but is there a better way?

I don't see why the normal send() and recv() semantics aren't
sufficient.

-- 
Grant Edwards                   grante             Yow!  I'm an East Side
                                  at               TYPE...
                               visi.com