Function do_register

tests/io_uring/register.rs:14–37

(
    fd: FD,
    registered_fd: bool,
    opcode: IoringRegisterOp,
    arg: *mut c_void,
    arg_nr: u32,
)

use rustix::mm::{MapFlags, ProtFlags};

fn do_register<FD>(
    fd: FD,
    registered_fd: bool,
    opcode: IoringRegisterOp,
    arg: *mut c_void,
    arg_nr: u32,
) -> Result<()>
where
    FD: AsFd,
{
    let flags = if registered_fd {
        IoringRegisterFlags::USE_REGISTERED_RING
    } else {
        IoringRegisterFlags::default()
    };

    // Cast `arg` to `*const c_void` to match the current API. See
    // <https://github.com/bytecodealliance/rustix/issues/1545>.
    unsafe {
        io_uring_register_with(fd, opcode, flags, arg as *const c_void, arg_nr)?;
    }

    Ok(())
}

fn register_ring(fd: BorrowedFd<'_>) -> Result<BorrowedFd<'_>> {
    let mut update = io_uring_rsrc_update::default();