[net] Added SetSocketNoDelay() utility function

src/net.cpp

@@ -1069,12 +1069,7 @@ void CConnman::AcceptConnection(const ListenSocket& hListenSocket) {
 
     // According to the internet TCP_NODELAY is not carried into accepted sockets
     // on all platforms.  Set it again here just to be sure.
-    int set = 1;
+    SetSocketNoDelay(hSocket);
-#ifdef WIN32
-    setsockopt(hSocket, IPPROTO_TCP, TCP_NODELAY, (const char*)&set, sizeof(int));
-#else
-    setsockopt(hSocket, IPPROTO_TCP, TCP_NODELAY, (void*)&set, sizeof(int));
-#endif
 
     if (IsBanned(addr) && !whitelisted)
     {

src/netbase.cpp

@@ -428,18 +428,14 @@ bool static ConnectSocketDirectly(const CService &addrConnect, SOCKET& hSocketRe
     if (hSocket == INVALID_SOCKET)
         return false;
 
-    int set = 1;
 #ifdef SO_NOSIGPIPE
+    int set = 1;
     // Different way of disabling SIGPIPE on BSD
     setsockopt(hSocket, SOL_SOCKET, SO_NOSIGPIPE, (void*)&set, sizeof(int));
 #endif
 
     //Disable Nagle's algorithm
-#ifdef WIN32
+    SetSocketNoDelay(hSocket);
-    setsockopt(hSocket, IPPROTO_TCP, TCP_NODELAY, (const char*)&set, sizeof(int));
-#else
-    setsockopt(hSocket, IPPROTO_TCP, TCP_NODELAY, (void*)&set, sizeof(int));
-#endif
 
     // Set to non-blocking
     if (!SetSocketNonBlocking(hSocket, true))
@@ -728,6 +724,13 @@ bool SetSocketNonBlocking(SOCKET& hSocket, bool fNonBlocking)
     return true;
 }
 
+bool SetSocketNoDelay(SOCKET& hSocket)
+{
+    int set = 1;
+    int rc = setsockopt(hSocket, IPPROTO_TCP, TCP_NODELAY, (const char*)&set, sizeof(int));
+    return rc == 0;
+}
+
 void InterruptSocks5(bool interrupt)
 {
     interruptSocks5Recv = interrupt;

src/netbase.h

@@ -59,6 +59,8 @@ std::string NetworkErrorString(int err);
 bool CloseSocket(SOCKET& hSocket);
 /** Disable or enable blocking-mode for a socket */
 bool SetSocketNonBlocking(SOCKET& hSocket, bool fNonBlocking);
+/** Set the TCP_NODELAY flag on a socket */
+bool SetSocketNoDelay(SOCKET& hSocket);
 /**
  * Convert milliseconds to a struct timeval for e.g. select.
  */