Make EiffelWeb standalone easier to debug by using in some locations error instead of exception for network error.

- Added C external to use C `recv` feature with error (as opposed to have exception raised on network error).

library/server/ewsgi/connectors/standalone/lib/httpd/httpd_request_handler_i.e

@@ -279,8 +279,7 @@ feature -- Execution
 				if a_is_reusing_connection then
 						--| set by default 5 seconds.
 					l_socket.set_recv_timeout (keep_alive_timeout) -- in seconds!
-						-- FIXME: check if both are really needed.
+					l_is_ready := socket_has_incoming_data (l_socket)
-					l_is_ready := l_socket.ready_for_reading and then l_socket.has_incoming_data
 				else
 					l_is_ready := True
 				end
@@ -396,9 +395,6 @@ feature -- Parsing
 				not has_error and then
 				a_socket.readable
 			then
-				if not a_socket.has_incoming_data then
-					dbglog ("analyze_request_message: NO INCOMING DATA !!!")
-				end
 				if
 					attached next_line (a_socket) as l_request_line and then
 					not l_request_line.is_empty
@@ -501,7 +497,11 @@ feature -- Parsing
 			if retried then
 				report_error ("Rescue in next_line")
 				Result := Void
-			elseif a_socket.readable then
+			elseif
+				a_socket.readable and then
+				socket_has_incoming_data (a_socket)
+			then
+
 				a_socket.read_line_thread_aware
 				Result := a_socket.last_string
 					-- Do no check `socket_ok' before socket operation,
@@ -550,6 +550,17 @@ feature -- Output
 			end
 		end
 
+feature {NONE} -- Helpers
+
+	socket_has_incoming_data (a_socket: HTTPD_STREAM_SOCKET): BOOLEAN
+			-- Is there any data to read on `a_socket' ?
+		require
+			a_socket.readable
+		do
+				-- FIXME: check if both are really needed.			
+			Result := a_socket.ready_for_reading and then a_socket.has_incoming_data
+		end
+
 invariant
 	request_header_attached: request_header /= Void
 

library/server/ewsgi/connectors/standalone/lib/httpd/network/tcp_stream_socket.e

@@ -67,7 +67,7 @@ feature -- Basic operation
 			l: like last_string
 		do
 			create ext.make_empty (nb_char + 1)
-			retval := c_receive (descriptor, ext.item, nb_char, c_peekmsg)
+			retval := clib_recv (descriptor, ext.item, nb_char, c_peekmsg)
 			if retval = 0 then
 				last_string.wipe_out
 				socket_error := Void
@@ -124,6 +124,19 @@ feature -- Status report
 			Result := (retval > 0)
 		end
 
+feature {NONE} -- C implementation
+
+	clib_recv (a_fd: INTEGER; buf: POINTER; len: INTEGER; flags: INTEGER): INTEGER
+			-- External routine to receive at most `len' number of
+			-- bytes into buffer `buf' from socket `fd' with `flags' options.
+		external
+			"C inline"
+		alias
+			"[
+			return (EIF_INTEGER) recv ((int) $a_fd, (char *) $buf, (int) $len, (int) $flags);
+			]"
+		end
+
 note
 	copyright: "2011-2015, Jocelyn Fiat, Javier Velilla, Eiffel Software and others"
 	license: "Eiffel Forum License v2 (see http://www.eiffel.com/licensing/forum.txt)"

library/server/ewsgi/connectors/standalone/lib/httpd/network/until_16_05/tcp_stream_socket_ext.e

@@ -56,15 +56,6 @@ feature {NONE} -- Externals
 		deferred
 		end
 
---	set_so_rcvtimeo (a_timeout_seconds: INTEGER)
---			-- Set the receive timeout in seconds on Current socket.
---			-- if `0' the related operations will never timeout.
---		require
---			positive_timeout: a_timeout_seconds >= 0
---		do
---			c_set_sock_recv_timeout (descriptor, level_sol_socket, a_timeout_seconds)
---		end
-
 	c_set_sock_recv_timeout (a_fd, a_level: INTEGER; a_timeout_seconds: INTEGER)
 			-- C routine to set socket option `SO_RCVTIMEO' with `a_timeout_seconds' seconds.
 		external