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_fisatty()
Defined in stdio.h, the _fisatty() function determines whether the given stdio stream is attached to a terminal device or a normal file.
It calls the _sys_istty() low-level
function on the underlying file handle.
This function is not part of the C library standard, but the Arm® C library supports it as an extension.
Syntax
int_fisatty(FILE *stream);
The return value indicates the stream destination:
- 0
A file.
- 1
A terminal.
- Negative
An error.