| 60 | } |
| 61 | |
| 62 | func echo(wq *waiter.Queue, ep tcpip.Endpoint) { |
| 63 | defer ep.Close() |
| 64 | |
| 65 | // Create wait queue entry that notifies a channel. |
| 66 | waitEntry, notifyCh := waiter.NewChannelEntry(waiter.ReadableEvents) |
| 67 | wq.EventRegister(&waitEntry) |
| 68 | defer wq.EventUnregister(&waitEntry) |
| 69 | |
| 70 | for { |
| 71 | var buf bytes.Buffer |
| 72 | if _, err := ep.Read(&buf, tcpip.ReadOptions{}); err != nil { |
| 73 | if _, ok := err.(*tcpip.ErrWouldBlock); ok { |
| 74 | <-notifyCh |
| 75 | continue |
| 76 | } |
| 77 | |
| 78 | return |
| 79 | } |
| 80 | |
| 81 | log.Printf("received %q", buf.String()) |
| 82 | } |
| 83 | } |
| 84 | |
| 85 | func Main() error { |
| 86 | var args struct { |