#elif defined __EMX__ /* emx+gcc */
return (fp->_flags & (_IORW | _IOWRT)) != 0;
#elif defined _IOERR /* AIX, HP-UX, IRIX, OSF/1, Solaris, OpenServer, mingw */
return (fp->_flag & (_IORW | _IOWRT)) != 0;
#elif defined __QNX__ /* QNX */
return (fp->_Mode & 0x2 /* _MOPENW */) != 0;
#elif defined __EMX__ /* emx+gcc */
return (fp->_flags & (_IORW | _IOWRT)) != 0;
#elif defined _IOERR /* AIX, HP-UX, IRIX, OSF/1, Solaris, OpenServer, mingw */
return (fp->_flag & (_IORW | _IOWRT)) != 0;
#elif defined __QNX__ /* QNX */
return (fp->_Mode & 0x2 /* _MOPENW */) != 0;