updated vendor

vendor/github.com/tetratelabs/wazero/experimental/sys/poll.go

@@ -0,0 +1,48 @@
+package sys
+
+// Pflag are bit flags used for polling. Values, including zero, should not
+// be interpreted numerically. Instead, use by constants prefixed with 'POLL'.
+//
+// # Notes
+//
+//   - This is like `pollfd.events` flags for `poll` in POSIX. See
+//     https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/poll.h.html
+type Pflag uint32
+
+// Only define bitflags we support and are needed by `poll_oneoff` in wasip1
+// See https://github.com/WebAssembly/WASI/blob/snapshot-01/phases/snapshot/docs.md#eventrwflags
+const (
+	// POLLIN is a read event.
+	POLLIN Pflag = 1 << iota
+
+	// POLLOUT is a write event.
+	POLLOUT
+)
+
+// Pollable is implemented by custom readers that support polling for
+// readiness. If a custom io.Reader passed to WithStdin implements this
+// interface, poll_oneoff will use it for asynchronous I/O instead of
+// returning "always ready".
+//
+// # Parameters
+//
+// The `flag` parameter determines which event to await, such as POLLIN,
+// POLLOUT, or a combination like `POLLIN|POLLOUT`.
+//
+// The `timeoutMillis` parameter is how long to block for an event, or
+// interrupted, in milliseconds. There are two special values:
+//   - zero returns immediately
+//   - any negative value blocks any amount of time
+//
+// # Results
+//
+// `ready` means there was data ready to read or written. False can mean no
+// event was ready or `errno` is not zero.
+//
+// A zero `errno` is success. The below are expected otherwise:
+//   - ENOSYS: the implementation does not support this function.
+//   - ENOTSUP: the implementation does not support the flag combination.
+//   - EINTR: the call was interrupted prior to an event.
+type Pollable interface {
+	Poll(flag Pflag, timeoutMillis int32) (ready bool, errno Errno)
+}