prep_cmd_sock

pub fn prep_cmd_sock(
    sqe: *linux.io_uring_sqe,
    cmd_op: linux.IO_URING_SOCKET_OP,
    fd: linux.fd_t,
    level: u32,
    optname: u32,
    optval: u64,
    optlen: u32,
) void {
    sqe.prep_rw(.URING_CMD, fd, 0, 0, 0);
    // off is overloaded with cmd_op, https://github.com/axboe/liburing/blob/e1003e496e66f9b0ae06674869795edf772d5500/src/include/liburing/io_uring.h#L39
    sqe.off = @intFromEnum(cmd_op);
    // addr is overloaded, https://github.com/axboe/liburing/blob/e1003e496e66f9b0ae06674869795edf772d5500/src/include/liburing/io_uring.h#L46
    sqe.addr = @bitCast(packed struct {
        level: u32,
        optname: u32,
    }{
        .level = level,
        .optname = optname,
    });
    // splice_fd_in if overloaded u32 -> i32
    sqe.splice_fd_in = @bitCast(optlen);
    // addr3 is overloaded, https://github.com/axboe/liburing/blob/e1003e496e66f9b0ae06674869795edf772d5500/src/include/liburing/io_uring.h#L102
    sqe.addr3 = optval;
}