Interface SubprocessProtocol

Interface for protocol for subprocess calls.

Name	Description
`pipeConnectionLost`	Called when one of the pipes communicating with the child process is closed.
`pipeDataReceived`	Called when the child process writes `data` into its stdout or stderr pipe.
`processExited`	Called when the child process has exited.
`connectionLost`	Called when the connection is lost or closed.
`connectionMade`	`connectionMade`() and `connectionLost`() are called exactly once per successful connection. All other callbacks will be called between those two methods, which allows for easier resource management in your protocol implementation.
`pauseWriting`	`pauseWriting`() and `resumeWriting`() calls are paired – `pauseWriting`() is called once when the buffer goes strictly over the high-water mark (even if subsequent writes increases the buffer size even more), and eventually `resumeWriting`() is called once when the buffer size reaches the low-water mark.
`resumeWriting`	Called when the transport’s buffer drains below the low-water mark.

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