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Checking for an open server port

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  • Devin Asay
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  • 09 November 2009
Checking for an open server port
I have several Rev apps that store data on networked MySQL databases. If I happen to be in a network environment where the port I need to access is blocked (as some restrictive public WiFi's do), or if I just lose my internet connection, any revOpenDatabase function call will hang for a long time before it times out and reports a failure. So I worked out a way to check for an open port to the server, using a shell call to netstat, that doesn't hang my app. Instead, if the port is not available it is gracefully reported in just a few seconds without hanging Rev. I think the technique could be adapted to other, similar calls that block Rev while waiting for a timeout failure. I've only tested it on OS X and Win XP.
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