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 DUI0471K
Copyright © 2010-2014 ARM. All rights reserved.