Function main

src/tests/test_linkee.cpp:96–203

* This process provides a target for testing remote link semantics * in libprocess. * * When this process starts up, it sends a message to the provided UPID. * This message is a notification that the test-linkee is ready to be * linked against and also allows the parent to discover the linkee's UPID. * * In order to test "stale" links, this process will exit upon receiving * a message. Thi

 * a message. This gives a clear signal that a message was received.
 */
int main(int argc, char** argv)
{
  if (argc <= 1) {
    EXIT(EXIT_FAILURE) << "Usage: test-linkee <UPID>";
  }

  // NOTE: On Windows, this initialization must take place before creating a
  // `Socket`, otherwise the IOCP handle will be uninitialized. See MESOS-9097.
  process::initialize();

  // Create a server socket.
  Try<Socket> create = Socket::create();
  if (create.isError()) {
    EXIT(EXIT_FAILURE)
      << "Failed to create server socket: " << create.error();
  }
  __s__ = new Socket(create.get());

  // Allow address reuse.
  // NOTE: We cast to `char*` here because the function prototypes on Windows
  // use `char*` instead of `void*`.
  int on = 1;
  if (::setsockopt(
          __s__->get(),
          SOL_SOCKET,
          SO_REUSEADDR,
          reinterpret_cast<char*>(&on),
          sizeof(on)) < 0) {
    EXIT(EXIT_FAILURE)
      << "Failed to setsockopt(SO_REUSEADDR): " << ErrnoError().message;
  }

  // Bind to some random port.
  Try<Address> bind = __s__->bind(inet4::Address::ANY_ANY());
  if (bind.isError()) {
    EXIT(EXIT_FAILURE) << "Failed to bind: " << bind.error();
  }

  Address address = bind.get();

  // Resolve the hostname if the IP is 0.0.0.0 in case we actually have
  // a valid external IP address. Note that we need only one IP address,
  // so that other processes can send and receive and don't get confused
  // as to whom they are sending to.
  //
  // This code is copied from process::initialize(), so it matches
  // how libprocess proper sets up its listening socket.
  if (address.ip.isAny()) {
    char hostname[512];

    if (gethostname(hostname, sizeof(hostname)) < 0) {
      PLOG(FATAL) << "Failed to get the local hostname";
    }

    // Lookup an IP address of local hostname, taking the first result.
    Try<net::IP> ip = net::getIP(hostname, address.ip.family());

    if (ip.isError()) {