SBIOC
#define SBIOCSTIME (SBIOC|1) /* set timeout info */
#define SBIOCGTIME (SBIOC|2) /* get timeout info */
#define SBIOCCTIME (SBIOC|3) /* clear timeout */
#define SBIOCSCHUNK (SBIOC|4) /* set chunksize */
#define SBIOCGCHUNK (SBIOC|5) /* get chunksize */
#define SBIOCSSNAP (SBIOC|6) /* set snapshot length */
#define SBIOCGSNAP (SBIOC|7) /* get snapshot length */
#define SBIOCSFLAGS (SBIOC|8) /* set buffering modes */
#define SBIOCGFLAGS (SBIOC|9) /* get buffering modes */