FIO*

Updated: April 19, 2023

This chapter describes the ioctl() commands that apply to file I/O.

FIOASYNC
Set or clear asynchronous I/O
FIOCLEX
Set “close on exec” on a file descriptor
FIOGETOWN
Get the owner of a file
FIONBIO
Set or clear nonblocking I/O
FIONCLEX
Clear “close on exec” on a file descriptor
FIONREAD
Determine the number of characters waiting to be read
FIONSPACE
Get the amount of space in the send queue
FIONWRITE
Get the number of bytes outstanding in the send queue.
FIOSETOWN
Set the owner of a file