the file descriptor returned by a call to io_uring_setup(2)
code of operation to execute on args
Args used by specified operation. See RegisterOpCode for usage details.
number of provided arguments
On success, io_uring_register() returns 0. On error, -1 is returned, and errno is set accordingly.
`io_uring_register(2)
Register files or user buffers for asynchronous I/O.
The io_uring_register() system call registers user buffers or files for use in an io_uring(7) instance referenced by fd. Registering files or user buffers allows the kernel to take long term references to internal data structures or create long term mappings of application memory, greatly reducing per-I/O overhead.