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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.

Close the specified FileDescriptor

namespace HH\Lib\OS;

function close(
  FileDescriptor $fd,
): void;

See man 2 close for details. On error, an ErrnoException will be thrown.

This function is not automatically retried on EINTR, as close() is not safe to retry on EINTR.

Parameters​

  • FileDescriptor $fd

Returns​

  • void