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Terminal device control

Packet mode

The STREAMS-based pseudo-terminal subsystem also supports a feature called packet mode. This is used to inform the process on the master-side when ``state'' changes have occurred in the pseudo-tty. Packet mode is enabled by pushing the pckt module on the master-side. Data written on the master-side is processed normally. When data is written on the slave-side or when other messages are encountered by the pckt module, a header is added to the message so it can be retrieved later by the master-side with a getmsg operation.

The pckt module does the following:


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