CallNamedPipe when server does not exist yet....

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A client app is calling CallNamedPipe to connect to a server app. The timeout is set for 3 seconds.

If, at that moment, the pipe-server does not exist yet. Will CallNamedPipe wait 3 seconds for the server-side pipe to get created?

Or, would it fail immediately?

Posted 5-Jan-11 13:20pm

Peter Weyzen

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Sergey Alexandrovich Kryukov 5-Jan-11 23:52pm

Peter, may I ask you why waiting, especially 3 seconds :-)

If the pipe is not created on server path in 3 seconds, it may well be not created another hour. If the server was started in advance, then the client will be connected anyway. Perhaps you want to start client and server "almost at the same time"? Then, this would be bad design...

Peter Weyzen 6-Jan-11 3:47am

The client is a windows shell extension (on explorer.exe)... It actually starts long before the server starts up.

The concern wasn't really about that, but about a loop inside the server which accepts connections. There's a small window between when the incoming pipe is connected, before the next connection can happen. My concern was about what happens to the caller inside that window -- is it possible that the call from the shell could fail inside that window of time.

I know little about the ins and outs of pipes -- code was received from a contractor...

Thanks for confirming this.

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HimanshuJoshi · Accepted Answer · 2011-01-05T15:31:00

Solution 1

According to this[^] it waits if the pipe being called is not available.

Posted 5-Jan-11 15:31pm

HimanshuJoshi

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Peter Weyzen 5-Jan-11 22:12pm

Thanks -- just looking for confirmation!