gdb: isatty

 
 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.