Use send/sendmsg and don't ignore SIGPIPE

tools/load_tester.cpp

@@ -300,7 +300,7 @@ struct Connection {
   bool writeBytes() {
     for (;;) {
       assert(!request.empty());
-      int w = write(fd, request.data(), request.size());
+      int w = send(fd, request.data(), request.size(), MSG_NOSIGNAL);
       if (w == -1) {
         if (errno == EINTR) {
           continue;
@@ -610,7 +610,6 @@ int main(int argc, char *argv[]) {
   }
   printf("\n");
 
-  signal(SIGPIPE, SIG_IGN);
   signal(SIGTERM, signal_handler);
   signal(SIGINT, signal_handler);