X-Git-Url: http://nitlanguage.org

diff --git a/lib/signals.nit b/lib/signals.nit
index d704d3f..440fd39 100644
--- a/lib/signals.nit
+++ b/lib/signals.nit
@@ -14,7 +14,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-# Module to manage standard C signals
+# ANSI C signal handling
 #
 # Common usage imply 5 steps:
 #
@@ -64,6 +64,7 @@ module signals
 	#define _POSIX_SOURCE 1
 	#include <signal.h>
 	#include <stdio.h>
+	#include <unistd.h>
 
 	/*
 	*/
@@ -78,7 +79,7 @@ module signals
 		char raised; /* !=0 if has been raised */
 		void* handler; /* instance to receive call */
 		char safely; /* if !=0 then manage signal safely, otherwise react when raised */
-	} nit_signals_list[32] = {0x0};
+	} nit_signals_list[32] = {{0}};
 
 	/* Receiver to all signals
 		If unsafe, it calls directly the Nit receiver,
@@ -107,10 +108,10 @@ interface SignalHandler
 	#
 	#     class MyReceiver
 	#         super SignalHandler
-	#     
+	#
 	#         redef fun receive_signal(signal) do print "received safely {signal}"
 	#     end
-	#     
+	#
 	#     var r = new MyReceiver
 	#     r.handle_signal(sigint, true) # will call back when "check_signals" is called
 	#     # ...
@@ -127,10 +128,10 @@ interface SignalHandler
 	#
 	#     class MyReceiver
 	#         super SignalHandler
-	#     
+	#
 	#         redef fun receive_signal_unsafe(signal) do print "received unsafely {signal}"
 	#     end
-	#     
+	#
 	#     var r = new MyReceiver
 	#     r.handle_signal(sigsegv, false) # `r.receive_signal_unsafe` will be invoked on sigsegv
 	fun receive_signal_unsafe(signal: Int) do end
@@ -140,9 +141,7 @@ interface SignalHandler
 	# If `safely`, receiver will be called when `check_signals` in invoked
 	# otherwise the receiver is invoked when the signal is raised, it may
 	# crash the Nit system but is unavoidable for unstoppable signals.
-	fun handle_signal(signal: Int, safely: Bool) import
-		receive_signal `{
-		SignalHandler last_handler;
+	fun handle_signal(signal: Int, safely: Bool) import receive_signal `{
 		if (signal < 32 && signal >=0) {
 			struct sigaction act;
 			sigemptyset(&act.sa_mask);
@@ -151,21 +150,26 @@ interface SignalHandler
 
 			sigaction(signal, &act, NULL);
 
-			last_handler = (SignalHandler)nit_signals_list[signal].handler;
+		#ifdef SignalHandler_decr_ref
+			SignalHandler last_handler = (SignalHandler)nit_signals_list[signal].handler;
 			if (last_handler != NULL)
 				SignalHandler_decr_ref(last_handler);
+		#endif
 
 			nit_signals_list[signal].handler = self;
+
+		#ifdef SignalHandler_incr_ref
 			SignalHandler_incr_ref(self);
+		#endif
 
 			nit_signals_list[signal].safely = safely;
+
 			nit_SignalHandler_receive_signal = SignalHandler_receive_signal;
 		}
 	`}
 
 	# Set to ignore the signal
 	fun ignore_signal(signal: Int) `{
-		SignalHandler last_handler;
 		if (signal < 32 && signal >=0) {
 			struct sigaction act;
 			sigemptyset(&act.sa_mask);
@@ -173,15 +177,16 @@ interface SignalHandler
 			act.sa_handler = SIG_IGN;
 			sigaction(signal, &act, NULL);
 
-			last_handler = (SignalHandler)nit_signals_list[signal].handler;
+		#ifdef SignalHandler_decr_ref
+			SignalHandler last_handler = (SignalHandler)nit_signals_list[signal].handler;
 			if (last_handler != NULL)
 				SignalHandler_decr_ref(last_handler);
+		#endif
 		}
 	`}
 
 	# Set default action for the signal
 	fun default_signal(signal: Int) `{
-		SignalHandler last_handler;
 		if (signal < 32 && signal >=0) {
 			struct sigaction act;
 			sigemptyset(&act.sa_mask);
@@ -189,9 +194,11 @@ interface SignalHandler
 			act.sa_handler = SIG_DFL;
 			sigaction(signal, &act, NULL);
 
-			last_handler = (SignalHandler)nit_signals_list[signal].handler;
+		#ifdef SignalHandler_decr_ref
+			SignalHandler last_handler = (SignalHandler)nit_signals_list[signal].handler;
 			if (last_handler != NULL)
 				SignalHandler_decr_ref(last_handler);
+		#endif
 		}
 	`}
 end
@@ -227,7 +234,7 @@ redef class Process
 
 	# Send the kill signal to the process
 	fun kill do signal(sigkill)
-	
+
 	# Native implementation of `signal`
 	private fun native_kill(pid, signal: Int) `{ kill(pid, signal); `}
 end
@@ -304,7 +311,7 @@ fun sigvtalrm: Int do return 26
 # Profiling timer expired
 fun sigprof: Int do return 27
 
-# Sent to a process when its controlling terminal changes its window size 
+# Sent to a process when its controlling terminal changes its window size
 fun sigwinch: Int do return 28
 
 # Sent to a process when the system experiences a power failure