ChildProcessWithoutNullStreams

Properties

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The subprocess.channel property is a reference to the child's IPC channel. If no IPC channel exists, this property is undefined.

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The subprocess.connected property indicates whether it is still possible to send and receive messages from a child process. When subprocess.connected is false, it is no longer possible to send or receive messages.

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The subprocess.exitCode property indicates the exit code of the child process. If the child process is still running, the field will be null.

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The subprocess.killed property indicates whether the child process successfully received a signal from subprocess.kill(). The killed property does not indicate that the child process has been terminated.

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val pid: Double?

Returns the process identifier (PID) of the child process. If the child process fails to spawn due to errors, then the value is undefined and error is emitted.

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abstract var requiredStderr: Readable
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abstract var requiredStdin: Writable
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abstract var requiredStdout: Readable
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The subprocess.signalCode property indicates the signal received by the child process if any, else null.

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The subprocess.spawnargs property represents the full list of command-line arguments the child process was launched with.

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The subprocess.spawnfile property indicates the executable file name of the child process that is launched.

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open var stderr: Readable?

A Readable Stream that represents the child process's stderr.

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open var stdin: Writable?

A Writable Stream that represents the child process's stdin.

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A sparse array of pipes to the child process, corresponding with positions in the stdio option passed to {@link spawn} that have been set to the value 'pipe'. subprocess.stdio[0], subprocess.stdio[1], and subprocess.stdio[2] are also available as subprocess.stdin, subprocess.stdout, and subprocess.stderr, respectively.

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open var stdout: Readable?

A Readable Stream that represents the child process's stdout.

Functions

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fun addListener(event: String, listener: Function<Unit>)

events.EventEmitter

fun addListener(event: ChildProcessEvent.CLOSE, listener: (code: Double?, signal: Signals?) -> Unit)
fun addListener(event: ChildProcessEvent.DISCONNECT, listener: () -> Unit)
fun addListener(event: ChildProcessEvent.ERROR, listener: (JsError) -> Unit)
fun addListener(event: ChildProcessEvent.EXIT, listener: (code: Double?, signal: Signals?) -> Unit)
fun addListener(event: ChildProcessEvent.SPAWN, listener: () -> Unit)
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Closes the IPC channel between parent and child, allowing the child to exit gracefully once there are no other connections keeping it alive. After calling this method the subprocess.connected and process.connected properties in both the parent and child (respectively) will be set to false, and it will be no longer possible to pass messages between the processes.

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fun emit(event: Symbol, vararg args: Any?): Boolean
fun emit(event: String, vararg args: Any?): Boolean
fun emit(event: ChildProcessEvent.SPAWN, listener: () -> Unit): Boolean
fun emit(event: ChildProcessEvent.CLOSE, code: Double?, signal: Signals?): Boolean
fun emit(event: ChildProcessEvent.EXIT, code: Double?, signal: Signals?): Boolean
fun emit(event: ChildProcessEvent.MESSAGE, message: Serializable, sendHandle: SendHandle): Boolean
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Returns an array listing the events for which the emitter has registered listeners. The values in the array are strings or Symbols.

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Returns the current max listener value for the EventEmitter which is either set by emitter.setMaxListeners(n) or defaults to {@link defaultMaxListeners}.

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fun kill(): Boolean
fun kill(signal: Double = definedExternally): Boolean
fun kill(signal: Signals = definedExternally): Boolean

The subprocess.kill() method sends a signal to the child process. If no argument is given, the process will be sent the 'SIGTERM' signal. See signal(7) for a list of available signals. This function returns true if kill(2) succeeds, and false otherwise.

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fun on(event: String, listener: Function<Unit>)
fun on(event: ChildProcessEvent.CLOSE, listener: (code: Double?, signal: Signals?) -> Unit)
fun on(event: ChildProcessEvent.DISCONNECT, listener: () -> Unit)
fun on(event: ChildProcessEvent.ERROR, listener: (JsError) -> Unit)
fun on(event: ChildProcessEvent.EXIT, listener: (code: Double?, signal: Signals?) -> Unit)
fun on(event: ChildProcessEvent.SPAWN, listener: () -> Unit)
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fun once(event: String, listener: Function<Unit>)
fun once(event: ChildProcessEvent.CLOSE, listener: (code: Double?, signal: Signals?) -> Unit)
fun once(event: ChildProcessEvent.DISCONNECT, listener: () -> Unit)
fun once(event: ChildProcessEvent.ERROR, listener: (JsError) -> Unit)
fun once(event: ChildProcessEvent.EXIT, listener: (code: Double?, signal: Signals?) -> Unit)
fun once(event: ChildProcessEvent.SPAWN, listener: () -> Unit)
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fun prependListener(event: String, listener: Function<Unit>)
fun prependListener(event: ChildProcessEvent.CLOSE, listener: (code: Double?, signal: Signals?) -> Unit)
fun prependListener(event: ChildProcessEvent.EXIT, listener: (code: Double?, signal: Signals?) -> Unit)
fun prependListener(event: ChildProcessEvent.SPAWN, listener: () -> Unit)
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fun prependOnceListener(event: String, listener: Function<Unit>)
fun prependOnceListener(event: ChildProcessEvent.CLOSE, listener: (code: Double?, signal: Signals?) -> Unit)
fun prependOnceListener(event: ChildProcessEvent.EXIT, listener: (code: Double?, signal: Signals?) -> Unit)
fun prependOnceListener(event: ChildProcessEvent.SPAWN, listener: () -> Unit)
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fun ref()

Calling subprocess.ref() after making a call to subprocess.unref() will restore the removed reference count for the child process, forcing the parent to wait for the child to exit before exiting itself.

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fun send(message: Serializable, callback: (JsError?) -> Unit = definedExternally): Boolean

When an IPC channel has been established between the parent and child ( i.e. when using {@link fork}), the subprocess.send() method can be used to send messages to the child process. When the child process is a Node.js instance, these messages can be received via the 'message' event.

fun send(message: Serializable, sendHandle: SendHandle = definedExternally, callback: (JsError?) -> Unit = definedExternally): Boolean
fun send(message: Serializable, sendHandle: SendHandle = definedExternally, options: MessageOptions = definedExternally, callback: (JsError?) -> Unit = definedExternally): Boolean
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By default EventEmitters will print a warning if more than 10 listeners are added for a particular event. This is a useful default that helps finding memory leaks. The emitter.setMaxListeners() method allows the limit to be modified for this specific EventEmitter instance. The value can be set to Infinity (or 0) to indicate an unlimited number of listeners.

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fun unref()

By default, the parent will wait for the detached child to exit. To prevent the parent from waiting for a given subprocess to exit, use the subprocess.unref() method. Doing so will cause the parent's event loop to not include the child in its reference count, allowing the parent to exit independently of the child, unless there is an established IPC channel between the child and the parent.