SVR4_IOW           40 compat/svr4/svr4_filio.h #define	SVR4_FIOSETOWN	SVR4_IOW('f', 124, int)
SVR4_IOW           41 compat/svr4/svr4_filio.h #define	SVR4_FIOASYNC	SVR4_IOW('f', 125, int)
SVR4_IOW           42 compat/svr4/svr4_filio.h #define	SVR4_FIONBIO	SVR4_IOW('f', 126, int)