Set socket reuse flag in socket creation (#161)

Summary:
Pull Request resolved: #161

set the socket reuse flag for the communication agent to avoid timeouts

Reviewed By: RuiyuZhu

Differential Revision: D35207812

fbshipit-source-id: 4bb516db98f963e29165a873f889a5f24fde0840

fbpcf/engine/communication/SocketPartyCommunicationAgent.cpp

@@ -130,6 +130,12 @@ int SocketPartyCommunicationAgent::connectToHost(
     throw std::runtime_error("error opening socket");
   }
 
+  int enable = 1;
+
+  if (setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, &enable, sizeof(int)) < 0) {
+    XLOG(INFO) << "setsockopt(SO_REUSEADDR) failed";
+  }
+
   while (connect(sockfd, addrs->ai_addr, addrs->ai_addrlen) < 0) {
     // wait a second and retry
     usleep(1000);
@@ -147,6 +153,11 @@ int SocketPartyCommunicationAgent::receiveFromClient(int portNo) {
   if (sockfd < 0) {
     throw std::runtime_error("error opening socket");
   }
+  int enable = 1;
+
+  if (setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, &enable, sizeof(int)) < 0) {
+    XLOG(INFO) << "setsockopt(SO_REUSEADDR) failed";
+  }
 
   struct sockaddr_in servAddr;