Generic file-descriptor ioctl's. set close on exec on fd .
FIONCLEX
Generic file-descriptor ioctl's. remove close on exec.
FIONREAD
Generic file-descriptor ioctl's. get n bytes to read On a socket of type SOCK_DGRAM, the FIONREAD request returns the length of the data plus the length of the address.
FIONBIO
Generic file-descriptor ioctl's. set or clear non-blocking input or output.
FIOASYNC
Generic file-descriptor ioctl's. set or clear async input or output.
FIOSETOWN
Generic file-descriptor ioctl's. set owner.
FIOGETOWN
Generic file-descriptor ioctl's. get owner.
FIODTYPE
Generic file-descriptor ioctl's. get d_flags type part.