4.10.10. _sys_istty()

This function determines if a file handle identifies a terminal.

Syntax

int _sys_istty(FILE *f);

Implementation

When a file is connected to a terminal device, this functionis used to provide unbuffered behavior by default (in the absence of a call to set(v)buf) and to disallow seeking.

Returns

The return value is:

0

There is not an interactive device

1

There is an interactive device

other

An error occurred.

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