//
// WASI preview 1 includes a poll_oneoff host function that behaves similarly
// to poll(2) on Linux. Like poll(2), poll_oneoff is level triggered. It
// accepts one or more subscriptions to FD read or write events.
//
// Major differences to poll(2):
// - the events are not written to the input entries (like pollfd.revents), and
//   instead are appended to a separate events buffer. poll_oneoff writes zero

}

func (u *subscriptionUnion) subscriptionFdReadwrite() *subscriptionFdReadwrite {
	return (*subscriptionFdReadwrite)(unsafe.Pointer(&u[1]))
}

//go:wasmimport wasi_snapshot_preview1 poll_oneoff
//go:noescape
func poll_oneoff(in, out unsafe.Pointer, nsubscriptions size, nevents unsafe.Pointer) errno

func write1(fd uintptr, p unsafe.Pointer, n int32) int32 {
	iov := iovec{
		buf:    uintptr32(uintptr(p)),

package time

import (
	"errors"
	"runtime"
	"syscall"
)

// for testing: whatever interrupts a sleep
func interrupt() {
	// There is no mechanism in wasi to interrupt the call to poll_oneoff
	// used to implement runtime.usleep so this function does nothing, which
	// somewhat defeats the purpose of TestSleep but we are still better off
	// validating that time elapses when the process calls time.Sleep than