Read does not return when FD is closed for UIO

uio_test.go

package foo

import (
	"io"
	"os"
	"testing"
	"time"
)

func TestReadClosed(t *testing.T) {
	f, err := os.OpenFile(
		"/dev/uio0", // Replace this with a regular file, and this test will work just fine
		os.O_SYNC|os.O_RDWR,
		0600,
	)

	if err != nil {
		t.Fatal("Error opening", err)
	}

	done := make(chan int)

	go func() {
		buff := make([]byte, 4)
		n, err := f.Read(buff)
		switch err {
		case io.EOF:
			// expected
		case nil:
			t.Fatalf("Expected eof.  Instead got no error, read %d bytes with the contents: %+v", n, buff[:n])
		default:
			t.Fatal("Got unexpected error:", err)
		}
		done <- 1
	}()

	// Need to give the goroutine enough time to start the read.

	time.Sleep(time.Millisecond)

	if err = f.Close(); err != nil {
		t.Fatal("Got unexpected error:", err)
	}

	timeout := time.After(time.Millisecond * 100)

	select {
	case <-timeout:
		t.Fatal("Timeout waiting for goroutine to end")
	case <-done:
		// Expected
	}
}