I'm having a brain cramp and for some reason nothing I find online fixes
it. When I'm doing a RCVMSG, is the variable I specify in MSGDTALEN an
input or an output? Does it tell the API how long my buffer is, or does
it tell me how much data it put in there? If I specify MSGDTA but don't
specify MSGDTALEN can I overrun my buffer?
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