isatty ...... Synopsis: int isatty(int fd); Request: 'Fisatty,FD' Return value: Returns 1 if FD refers to the GDB console, 0 otherwise. Errors: 'EINTR' The call was interrupted by the user. Note that the 'isatty' call is treated as a special case: it returns 1 to the target if the file descriptor is attached to the GDB console, 0 otherwise. Implementing through system calls would require implementing 'ioctl' and would be more complex than needed.