7.15 SYS_ISTTY (0x09)

Checks whether a file is connected to an interactive device.

Entry

On entry, R1 contains a pointer to a one-word argument block:

word 1

A handle for a previously opened file object.

Return

On exit, R0 contains:

  • 1 if the handle identifies an interactive device

  • 0 if the handle identifies a file

  • a value other than 1 or 0 if an error occurs.

Non-ConfidentialPDF file icon PDF versionARM DUI0471M
Copyright © 2010-2016 ARM Limited or its affiliates. All rights reserved.