Function watchContextForEventFD

src/cmd/utils.go:545–569

(ctx context.Context, eventFD int)

}

func watchContextForEventFD(ctx context.Context, eventFD int) {
	done := ctx.Done()
	if done == nil {
		return
	}

	if eventFD < 0 {
		panic("invalid file descriptor for eventfd")
	}

	go func() {
		defer unix.Close(eventFD)

		select {
		case <-done:
			buffer := make([]byte, 8)
			binary.PutUvarint(buffer, 1)

			if _, err := unix.Write(eventFD, buffer); err != nil {
				panicMsg := fmt.Sprintf("write(2) to eventfd failed: %s", err)
				panic(panicMsg)
			}
		}
	}()
}