Article ID: 140263 - Last Review: March 8, 1999 - Revision: 1.0

PRB: recv() w/MSG_PEEK Always Returns Wrong Buffer Size

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This article was previously published under Q140263

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SYMPTOMS

An Application that uses the Winsock 1.1 call recv(..., MSG_PEEK) repeatedly, will always receive the amount of data as in the first call. This amount only changes when you call recv without MSG_PEEK.

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CAUSE

This is the result of a performance optimization within AFD.SYS.

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RESOLUTION

recv() with MSG_PEEK should generally be avoided. It is a very inefficient way to retrieve data and definitely not recommended if you care about performance. A much better solution would be to simply receive the data into user buffers and use it directly from there.

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