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Plan 9 - man page for flush (plan9 section 5)

FLUSH(5)					 File Formats Manual					     FLUSH(5)

flush - abort a message
Tflush tag[2] oldtag[2] Rflush tag[2]
When the response to a request is no longer needed, such as when a user interrupts a process doing a read(2), a Tflush request is sent to the server to purge the pending response. The message being flushed is identified by oldtag. The semantics of flush depends on messages arriving in order. The server must answer the flush message immediately. If it recognizes oldtag as the tag of a pending trans- action, it should abort any pending response and discard that tag. In either case, it should respond with an Rflush echoing the tag (not oldtag) of the Tflush message. A Tflush can never be responded to by an Rerror message. When the client sends the Tflush, it should disregard all messages received with tag oldtag until the corre- sponding Rflush is received, at which point oldtag may be recycled for subsequent messages. Several exceptional conditions are handled correctly by the above specification: sending multiple flushes for a single tag, flushing a Tflush, and flushing an invalid tag. FLUSH(5)

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