ARM Compiler toolchain ARM C and C++ Libraries and Floating-Point Support Reference: _sys_istty()

ARM Compiler toolchain ARM C and C++ Libraries and Floating-Point Support Reference

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`_sys_istty()`

Defined in rt_sys.h, this function determines if a file handle identifies a terminal.

Syntax

int _sys_istty(FILEHANDLE fh);

Usage

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

Returns

The return value is one of the following values:

0: There is no interactive device.
1: There is an interactive device.
other: An error occurred.

See also

Reference

_fisatty().

Using ARM^® C and C++ Libraries and Floating-Point Support:

Direct semihosting C library function dependencies.

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