Ttyname

:::info[Note] This is a point-in-time snapshot of the API documentation from January 2026. Going forward, we will not be maintaining a public copy of these references, and recommend users to refer to the built-in signature helpers available in the Hack LSP instead for complete and up-to-date information. :::

Get the name of the terminal associated with a file descriptor, if any

namespace HH\Lib\OS;

function ttyname(
  FileDescriptor $fd,
): string;

This function will throw if an error occurs; you may want to specifically handle ENOTTY.

Parameters

• FileDescriptor $fd

Returns

• string