ecere/net/network (Linux): Fixed race condition

- On Linux, the polling file descriptors were a pointer to memory that still
  gets updated (e.g., by clrSocket()) while the network mutex is not locked and poll() is running.
  Prior to switching to poll(), there was still an issue in directly selecting
  on the socket file descriptors directly in the network object.

ecere/src/net/network.ec

@@ -207,6 +207,11 @@ static class NetworkThread : Thread
 {
    uint Main()
    {
+#if !defined(__WIN32__)
+      struct pollfd * pollFDs = null;
+      int nAllocatedFDs = 0;
+#endif
+
       network.mutex.Wait();
       while(!network.networkTerminated)
       {
@@ -220,8 +225,13 @@ static class NetworkThread : Thread
 
             fd_set selectRS = network.readSet, selectWS = network.writeSet, selectES = network.exceptSet;
 #else
-            struct pollfd * pollFDs = network.pollFDs;
             int nPollFDs = network.numPollFDs;
+            if(nPollFDs > nAllocatedFDs)
+            {
+               nAllocatedFDs = nPollFDs;
+               pollFDs = renew pollFDs struct pollfd[nAllocatedFDs];
+            }
+            memcpy(pollFDs, network.pollFDs, sizeof(struct pollfd) * nPollFDs);
 #endif
 
             network.mutex.Release();
@@ -265,6 +275,7 @@ static class NetworkThread : Thread
 
       }
       network.mutex.Release();
+      delete pollFDs;
       return 0;
    }
 }