For your first problem, is this behavior different from using recv directly? In my experience, disconnections can be tricky. A connection can be silent for a long time yet still be connected. Without a graceful shutdown, the connection can linger as a zombie. Although this also makes it possible (theoretically) for the connection to be reestablished, for the most part that is irrelevant. The usual answers involve using timeouts or keepalives, either application-level or socket-level. This will at least enable your application to detect the abnormal socket state in a more timely fashion. Note that if you enable SO_KEEPALIVE, the default timeout will be no less than 2hrs, and should be modified. I don't believe asio has a portable way to do this, but there are socket options on posix systems and iocontrol functions for windows. Docs should lead you in the right direction. I imagine your second issue is the same; my only suggestion is a shorter connection timeout. While it seems logical that the disconnection of the network adapter would lead to notification of the disconnected sockets, this has never been the case for me (with Windows at least). Others may have further insight into these issues as well. Best of luck, Adam D. Walling On Aug 18, 2010, at 8:16 AM, Gözde Bahar KOŞ <gkos@aselsan.com.tr> wrote:

Hello,

I'm using synchronous TCP communication via asio sockets. I have following problems:

First problem; When I unplug ethernet cable, "eth0: Link is Down" is written in the console, but socket.write_some command does not detect link down failure.

Second problem; During socket.connect command, if I plug ethernet cable, connect command does not detect this till "Connection timed out" error occurs. If I run socket.connect again, it detects the connection.

How can I detect these plug/unplug events as soon as the event occurs?

Best Regards, Gözde Koş ###################################################################### Dikkat:

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