io_uring_setup

fnint io_uring_setup(uint entries, io_uring_params * params) @system

Set up an io_uring instance.

Creates a new io_uring instance with the specified number of submission queue entries. The params structure is filled by the kernel with ring configuration details needed for subsequent mmap() calls.

Parameters

`entries`	Requested number of submission queue entries (will be rounded up to power of 2).
`params`	Parameters struct; `flags` may be set by caller, rest filled by kernel on success.

Returns

File descriptor for the io_uring instance on success, or -1 on error (check errno).

Throws

Does not throw. Returns -1 on error and sets errno.

Returns ENOSYS if the kernel does not support io_uring (Linux < 5.1).