1 files changed, 99 insertions, 0 deletions
diff --git a/src/internal/poll/fd_poll_js.go b/src/internal/poll/fd_poll_js.go
new file mode 100644
index 0000000..d6b28e5
--- /dev/null
+++ b/src/internal/poll/fd_poll_js.go
@@ -0,0 +1,99 @@
+// Copyright 2013 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build js,wasm
+
+package poll
+
+import (
+	"syscall"
+	"time"
+)
+
+type pollDesc struct {
+	fd      *FD
+	closing bool
+}
+
+func (pd *pollDesc) init(fd *FD) error { pd.fd = fd; return nil }
+
+func (pd *pollDesc) close() {}
+
+func (pd *pollDesc) evict() {
+	pd.closing = true
+	if pd.fd != nil {
+		syscall.StopIO(pd.fd.Sysfd)
+	}
+}
+
+func (pd *pollDesc) prepare(mode int, isFile bool) error {
+	if pd.closing {
+		return errClosing(isFile)
+	}
+	return nil
+}
+
+func (pd *pollDesc) prepareRead(isFile bool) error { return pd.prepare('r', isFile) }
+
+func (pd *pollDesc) prepareWrite(isFile bool) error { return pd.prepare('w', isFile) }
+
+func (pd *pollDesc) wait(mode int, isFile bool) error {
+	if pd.closing {
+		return errClosing(isFile)
+	}
+	if isFile { // TODO(neelance): wasm: Use callbacks from JS to block until the read/write finished.
+		return nil
+	}
+	return ErrDeadlineExceeded
+}
+
+func (pd *pollDesc) waitRead(isFile bool) error { return pd.wait('r', isFile) }
+
+func (pd *pollDesc) waitWrite(isFile bool) error { return pd.wait('w', isFile) }
+
+func (pd *pollDesc) waitCanceled(mode int) {}
+
+func (pd *pollDesc) pollable() bool { return true }
+
+// SetDeadline sets the read and write deadlines associated with fd.
+func (fd *FD) SetDeadline(t time.Time) error {
+	return setDeadlineImpl(fd, t, 'r'+'w')
+}
+
+// SetReadDeadline sets the read deadline associated with fd.
+func (fd *FD) SetReadDeadline(t time.Time) error {
+	return setDeadlineImpl(fd, t, 'r')
+}
+
+// SetWriteDeadline sets the write deadline associated with fd.
+func (fd *FD) SetWriteDeadline(t time.Time) error {
+	return setDeadlineImpl(fd, t, 'w')
+}
+
+func setDeadlineImpl(fd *FD, t time.Time, mode int) error {
+	d := t.UnixNano()
+	if t.IsZero() {
+		d = 0
+	}
+	if err := fd.incref(); err != nil {
+		return err
+	}
+	switch mode {
+	case 'r':
+		syscall.SetReadDeadline(fd.Sysfd, d)
+	case 'w':
+		syscall.SetWriteDeadline(fd.Sysfd, d)
+	case 'r' + 'w':
+		syscall.SetReadDeadline(fd.Sysfd, d)
+		syscall.SetWriteDeadline(fd.Sysfd, d)
+	}
+	fd.decref()
+	return nil
+}
+
+// IsPollDescriptor reports whether fd is the descriptor being used by the poller.
+// This is only used for testing.
+func IsPollDescriptor(fd uintptr) bool {
+	return false
+}