Method poll

crates/test-programs/src/preview1.rs:214–237

(fd: wasip1::Fd, event: wasip1::Eventtype)

    }

    fn poll(fd: wasip1::Fd, event: wasip1::Eventtype) -> Result<(), wasip1::Errno> {
        assert!(
            unsafe {
                wasip1::poll_oneoff(
                    [wasip1::Subscription {
                        userdata: 0,
                        u: wasip1::SubscriptionU {
                            tag: event.raw(),
                            u: wasip1::SubscriptionUU {
                                fd_read: wasip1::SubscriptionFdReadwrite {
                                    file_descriptor: fd,
                                },
                            },
                        },
                    }]
                    .as_ptr(),
                    MaybeUninit::<wasip1::Event>::uninit().as_mut_ptr(),
                    1,
                )
            }? == 1
        );

        Ok(())
    }

    pub unsafe fn read(
        &self,