Do not consider a receive timeout to be an error

The non-polling versions of the POSIX transport profiles shoud behave the same
as the polling versions. That means that a receive timeout, because no data was
available, is not an error.

Signed-off-by: J. S. Seldenthuis <jseldenthuis@lely.com>

Author: jseldent

src/c/profile/transport/ip/tcp/tcp_transport_posix_nopoll.c

@@ -144,6 +144,10 @@ size_t uxr_read_tcp_data_platform(
 
         remaining_time = timeout - (int)(uxr_millis() - start_timestamp);
     } while (-1 == bytes_received && EINTR == errno);
+    if (-1 == bytes_received && (EAGAIN == errno || EWOULDBLOCK == errno)) {
+        errno = errsv;
+        bytes_received = 0;
+    }
     if (-1 != bytes_received)
     {
         rv = (size_t)bytes_received;

src/c/profile/transport/ip/udp/udp_transport_posix_nopoll.c

@@ -131,6 +131,10 @@ size_t uxr_read_udp_data_platform(
 
         remaining_time = timeout - (int)(uxr_millis() - start_timestamp);
     } while (-1 == bytes_received && EINTR == errno);
+    if (-1 == bytes_received && (EAGAIN == errno || EWOULDBLOCK == errno)) {
+        errno = errsv;
+        bytes_received = 0;
+    }
     if (-1 != bytes_received)
     {
         rv = (size_t)bytes_received;