file: job.t package: muf status: alpha
This is the fundamental non-root function for reading a
message stream: It returns all information stored in
the message stream for a particular packet, plus the
value of @$s.actingUser in the job that sent
the packet at the time the packet was sent, as an
anti-spoofing measure.
(see section |writeStreamPacket.)
One normally supplies t for noFragments, meaning
that only completed packets should be read: Supplying
nil for this parameter will result in even
incomplete packets being returned, which is
occasionally useful.
If no input is available, the job blocks until something
arrives, unless both stream$s.dead
and @$s.readNilFromDeadStreams are non-nil,
in which case an empty block plus two nils are returned.
See section |readAnyStreamPacket.
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