Synopsis

#include <unistd.h>

int isatty(int fildes);

Status

Partially implemented

Conformance

IEEE Std 1003.1-2017

Description

The isatty() function shall test whether fildes, an open file descriptor, is associated with a terminal device.

Return value

The isatty() function shall return 1 if fildes is associated with a terminal; otherwise, it shall return 0 and may set errno to indicate the error.

Errors

The isatty() function may fail if:

  • EBADF - The fildes argument is not a valid open file descriptor.

  • ENOTTY - The file associated with the fildes argument is not a terminal.

Tests

Untested

Known bugs

None

See Also

  1. Standard library functions
  2. Table of Contents