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94 lines
2.3 KiB
Plaintext
94 lines
2.3 KiB
Plaintext
The "svc-t" program / "x.svc.t"
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permission makes up the terminal
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subsystem for KittenOS NEO.
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--- THEORETICAL TERMINALS MODEL ---
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The theoretical model for terminals
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in KittenOS NEO is that of a stack
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of processes controlling a player's
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connection to a MUD, where text is
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provided to the server and to the
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player in a line-by-line format,
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with no "flow control"/ttyattrs.
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A process starting another process
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connected to the same terminal is
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advised to wait for that process to
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die before continuing in terminal
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activities, unless some sort of
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'in-band notification' functionality
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is intended.
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The controlling process is whichever
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process is supposed to be accepting
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user input. This is contextual, and
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there is no mechanism to control
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this explicitly.
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The controlling process should show
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text in response to any user input,
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or at least provide some form of
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acknowledgement that user input has
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been received.
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User input IS NOT automatically
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echoed by the terminal.
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--- ACTUAL USAGE OF TERMINALS ---
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Access control on terminals is looser
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than for most permissions, as it has
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to be able to be 'sublet' in some
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cases, including events.
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A terminal program is given a string
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argument for the ID of the terminal
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to connect to.
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A terminal always has an ID beginning
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with "x.svc.t/". ALWAYS CHECK THIS.
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Requiring the responsible access
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connects to the terminal. All
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terminal programs SHOULD check for
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the death of their parent terminal
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(via the k.procdie event) and
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self-destruct accordingly.
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A program may start svc-t directly.
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In this case, it must pass a function
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(resTbl) and may pass a title.
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When the terminal has shown, the
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function provided is called with a
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table as follows:
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access = "x.svc.t/<...>"
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close = function (): close terminal
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The k.kill permission and the close
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function are the only ways for a
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program to kill a terminal, and the
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close function is only given to the
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creating process.
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In either case, when the access has
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been acquired, the following API is
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presented:
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id = "x.svc.t/<...>"
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pid = <The terminal's PID.>
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line = function (text): Shows a line.
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When the user sends a line, an event
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of: <id>, "line", <text>
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is provided.
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-- This is released into
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the public domain.
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-- No warranty is provided,
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implied or otherwise.
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