PipeEndState.closeInternal

void closeInternal(PipeCloseReason reason, int errorNumber, bool invokeCallback) @trusted nothrow

Internal close implementation.

Unregisters the wakeup watcher, closes the handle (which cancels pending I/O), resets state, and optionally invokes the close callback.

`reason`	The reason for closing.
`errorNumber`	Error code if closing due to error, or `0`.
`invokeCallback`	Whether to invoke the close callback.