_real_isatty       19 native_client_sdk/src/libraries/nacl_io/kernel_wrap_real.h int _real_isatty(int fd, int* result);
_real_isatty       99 native_client_sdk/src/libraries/nacl_io/passthroughfs/passthrough_fs.cc     int err = _real_isatty(real_fd_, &result);