STREAMS Messages

STREAMS provides a basic message-passing scheme.

STREAMS provides a basic message-passing scheme based on the following concepts:

Message Blocks
A STREAMS message consists of one or more linked message blocks. That is, the first message block of a message may be attached to other message blocks that are part of the same message.
Message Types
All STREAMS messages are assigned message types to indicate their intended use by modules and drivers and to determine their handling by the stream head.
Message Queue Priority
The STREAMS scheduler operates strictly in a first-in-first-out (FIFO) manner so that each QUEUE service procedure receives control in the order it was scheduled.
Sending and Receiving Messages
This section describes the STREAMS-related system call that sends and receive messages.

Parent topic: STREAMS