TestSelect

gistfile1.txt

        rr, ww, err := os.Pipe()
        if err != nil {
                t.Fatal(err)
        }
        defer rr.Close()
        defer ww.Close()

        if _, err := ww.Write([]byte("HELLO GOPHER")); err != nil {
                t.Fatal(err)
        }

        rFdSet := &unix.FdSet{}
        fd := rr.Fd()
        // FD_SET(fd, rFdSet)
        rFdSet.Bits[fd/unix.NFDBITS] |= (1 << (fd % unix.NFDBITS))

        n, err = unix.Select(int(fd+1), rFdSet, nil, nil, nil)
        if err != nil {
                t.Fatalf("Select: %v", err)
        }
        if n != 1 {
                t.Fatalf("Select: expected 1 ready file descriptors, got %v", n)
        }