Replace select by poll

packet-exchange/src/send_packet.c

@@ -127,7 +127,7 @@ void send_udp_packet(int use_etf, int use_timestamps, uint64_t txtime,
   struct iovec iov;
   int sendmsgerr;
   int res;
-  fd_set readfs;
+  struct pollfd poll_fd = {fd, POLLPRI, 0};
 
   memset(&sin, 0, sizeof(sin));
   sin.sin_family = AF_INET;
@@ -162,10 +162,7 @@ void send_udp_packet(int use_etf, int use_timestamps, uint64_t txtime,
 
   if(use_timestamps) {
 
-    FD_ZERO(&readfs);
-    FD_SET(fd, &readfs);
-
-    res = select(fd + 1, &readfs, 0, NULL, NULL);
+    res = poll(&poll_fd, 1, 0);
     if (res > 0)
       process_timestamps();
     else