Re: [Boost-users] [asio]Does the function of async_read can find the tcp connection has closed?

Subject: Re: [Boost-users] [asio]Does the function of async_read can find the tcp connection has closed?
From: Gavin Lambert (gavinl_at_[hidden])
Date: 2014-04-15 03:37:12

On 15/04/2014 16:04, quoth lx:
>       I want to know async_read or async_write can detect the tcp
> connection has closed, or not?

Try it and see.

Generally you should get an error callback for write if the connection 
has closed.  You may or may not get one for read, depending on how the 
connection was closed.  (Graceful shutdown or local connections 
typically will, unexpected remote disconnection typically won't.)

This is not unique to ASIO; it's how pretty much all TCP sockets work.