---
layout: default
title: PTY
parent: API
nav_order: 1
permalink: /api/pty
---
# PTY
**Inherits:** [Node] < [Object]
_Linux and macOS only._
Node for forking processes (e.g. bash, nodejs, python) with pseudoterminal file descriptors.
Can be used with the [Terminal] node to get an actual shell.
Not currently supported on Windows, but it could be in the future using [ConPTY](https://docs.microsoft.com/en-us/windows/console) or [WinPTY](https://github.com/rprichard/winpty).
See issue [\#25](https://github.com/lihop/godot-xterm/issues/25).
## Overview
<sub>"PTY Diagram" is a derivative of [Termios-script-diagram.svg](https://commons.wikimedia.org/wiki/File:Termios-script-diagram.svg) by [Krishnavedala](https://en.wikipedia.org/wiki/User:Krishnavedala?rdfrom=commons:User:Krishnavedala), used under [CC0](https://creativecommons.org/share-your-work/public-domain/cc0/).
## Properties
| Type | Name | Default |
| ------------ | ------------------------------------ | ------------------------------------------------------ |
| [NodePath] | [terminal_path](#prop-terminal_path) | None |
| [int] | [cols](#prop-cols) | `80` |
| [int] | [rows](#prop-rows) | `24` |
| [Dictionary] | [env](#prop-env) | `{ COLORTERM = "truecolor", TERM = "xterm-256color" }` |
| [bool] | [use_os_env](#prop-use_os_env) | `true` |
## Methods
| Returns | Signature |
| ------- | ----------------------------------------------------------------------------------------------------------------------------------- |
| [Error] | [fork](#mthd-fork) **(** [String] file=`$SHELL`, [PoolStringArray] args=[], [String] cwd=`$PWD`, [int] cols=80, [int] rows=24 **)** |
| void | [kill](#mthd-kill) **(** [int] signum **)** |
| [Error] | [open](#mthd-open) **(** [int] cols=80, [int] rows=24 **)** |
| void | [resize](#mthd-resize) **(** [int] cols, [int] rows **)** |
| void | [resizev](#mthd-resizev) **(** [Vector2] size **)** |
| void | [write](#mthd-write) **(** [String]\|[PoolByteArray] data **)** |
## Signals
- <a name="sgnl-data_received" /> **data_received** **(** [PoolByteArray] data **)**
Emitted when data is read from the pseudoterminal master device.
---
- <a name="sgnl-exited" /> **exited** **(** [int] exit_code, [int] signum **)**
Emitted when the child program exits. `exit_code` is the exit status of the child program and `signum` is the number of the signal that terminated the child program.
## Enumerations
### <a name="enum-signal" /> enum **Signal**:
- **SIGHUP** = 1 --- Hangup.
- **SIGINT** = 2 --- Terminal interrupt signal.
- **SIGQUIT** = 3 --- Terminal quit signal.
- **SIGILL** = 4 --- Illegal instruction.
- **SIGTRAP** = 5 --- Trace/breakpoint trap.
- **SIGABRT** = 6 --- Process abort signal.
- **SIGFPE** = 8 --- Erroneous arithmetic operation.
- **SIGKILL** = 9 --- Kill (cannot be caught or ignored).
- **SIGSEGV** = 11 --- Invalid memory reference.
- **SIGPIPE** = 13 --- Write on a pipe with no one to read it.
- **SIGALRM** = 14 --- Alarm clock.
- **SIGTERM** = 15 --- Termination signal.
## Property Descriptions
### <a name="prop-terminal_path" /> [NodePath] **terminal_path**
| | |
| --------- | ------------------------ |
| _Default_ | None |
| _Setter_ | set_terminal_path(value) |
| _Getter_ | None |
[NodePath] to a [Terminal]. Setting this path will automatically connect the appropriate signals of both nodes for standard operation. It will also disconnected the signals of the previously set terminal, if any.
---
- <a name="prop-cols" /> [int] **cols**
| | |
| --------- | --------------- |
| _Default_ | `80` |
| _Setter_ | set_cols(value) |
| _Getter_ | None |
The column size in characters.
---
- <a name="prop-rows" /> [int] **rows**
| | |
| --------- | --------------- |
| _Default_ | `24` |
| _Setter_ | set_rows(value) |
| _Getter_ | None |
The row size in characters.
---
- <a name="prop-env" /> [Dictionary] **env**
| | |
| --------- | ------------------------------------------------------ |
| _Default_ | `{ COLORTERM = "truecolor", TERM = "xterm-256color" }` |
| _Setter_ | None |
| _Getter_ | None |
Environment variables to be set for the child program.
---
- <a name="prop-use_os_env" /> [bool] **use_os_env**
| | |
| --------- | ------ |
| _Default_ | `true` |
| _Setter_ | None |
| _Getter_ | None |
If `true` the environment variables from `env` will be merged with the environment variables of the current program (i.e. Godot), with the variables from `env` taking precedence over the environment variables of the current program.
## Method Descriptions
- <a name="mthd-fork" /> [Error] **fork** **(** [String] file=`$SHELL`, [PoolStringArray] args=[], [String] cwd=`$PWD`, [int] cols=80, [int] rows=24 **)**
Opens a pseudoterminal and starts a new process using the program specified by `file`.
`file` defaults to the value of the `SHELL` environment variable, falling back to `sh`.
The arguments specified in `args` are passed to the program.
`cwd` is the directory in which the program will be executed. Defaults to the working directory of the current program (typically the project directory, when running from editor).
`cols` is the initial number of columns and `rows` is the initial number of rows.
Returns [OK] if successful.
See also Godot's [OS.execute()](https://docs.godotengine.org/en/stable/classes/class_os.html#class-os-method-execute) method.
---
- <a name="mthd-kill" /> void **kill** **(** [int] signum=1 **)**
Sends the specified signal (`signum`) to the PTY's child process, if any. Defaults to 1 (SIGHUP).
See also Godot's [OS.kill()](https://docs.godotengine.org/en/stable/classes/class_os.html#class-os-method-kill) method.
---
- <a name="mthd-open" /> [Error] **open** **(** [int] cols=80, [int] rows=24 **)**
Opens a pseudoterminal but does not start any process. Returns [OK] if successful.
---
- <a name="mthd-resize" /> void **resize** **(** [int] cols, [int] rows **)**
Resizes the dimensions of the pseudoterminal.
---
- <a name="mthd-resizev" /> void **resizev** **(** [Vector2] size **)**
Same as resize, but accepts a [Vector2] where `x` is cols and `y` is rows.
---
- <a name="mthd-write" /> void **write** **(** [String] \| [PoolByteArray] data **)**
Writes data to the pseudoterminal master device.
[Dictionary]: https://docs.godotengine.org/en/stable/classes/class_dictionary.html
[Error]: https://docs.godotengine.org/en/stable/classes/class_%40globalscope.html#enum-globalscope-error
[Node]: https://docs.godotengine.org/en/stable/classes/class_node.html
[NodePath]: https://docs.godotengine.org/en/stable/classes/class_nodepath.html
[Object]: https://docs.godotengine.org/en/stable/classes/class_object.html
[OK]: https://docs.godotengine.org/en/stable/classes/class_%40globalscope.html#class-globalscope-constant-ok
[PoolByteArray]: https://docs.godotengine.org/en/stable/classes/class_poolbytearray.html
[PoolStringArray]: https://docs.godotengine.org/en/stable/classes/class_poolstringarray.html
[String]: https://docs.godotengine.org/en/stable/classes/class_string.html
[Terminal]: /api/terminal
[Vector2]: https://docs.godotengine.org/en/stable/classes/class_vector2.html
[bool]: https://docs.godotengine.org/en/stable/classes/class_bool.html
[int]: https://docs.godotengine.org/en/stable/classes/class_int.html