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[nit.git] / lib / signals.nit

diff --git a/lib/signals.nit b/lib/signals.nit
index 91015da..89f4a1b 100644 (file)
--- a/lib/signals.nit
+++ b/lib/signals.nit
@@ -24,6 +24,21 @@ module signals
        #include <stdio.h>
 
        /*
+               This guard prevents errors by the C compiler when the Nit code imports this
+               module but do not use handle_signal. When it is _not_ used, the C type
+               SignalHandler and C function SignalHandler_receive_signal are not generated.
+               Which does not please the C compiler. This guard ensure that we compile this
+               code only if the type SignalHandler has been defined.
+
+               This is a HACK, FIXME by:
+               * Adding the macro to the FFI spec, or
+               * Attach the callbacks to this code block (or the module itself)
+               * Avoid using Nit types and callbacks or use them only in the C implementation
+                 of Nit method.
+       */
+       #ifdef NIT_TYPE_SignalHandler
+
+       /*
                Structure to manage each possible signals
                are used in an array of 32 maximum signals.
                This array is global to the software.
@@ -49,6 +64,8 @@ module signals
                        }
                }
        }
+
+       #endif
 `}
 
 # Receives the callback from system when a given signal arise
@@ -69,8 +86,7 @@ interface SignalHandler
        #     r.handle_signal(sigint, true) # will call back when "check_signals" is called
        #     # ...
        #     check_signals # if a signal was received, it will invoke `r.receive_signal`
-       fun receive_signal(signal: Int) `{
-       `}
+       fun receive_signal(signal: Int) do end
 
        # Called immediatly on receiving an unsafe signal (should be redefed by subclasses)
        #
@@ -88,8 +104,7 @@ interface SignalHandler
        #     
        #     var r = new MyReceiver
        #     r.handle_signal(sigsegv, false) # `r.receive_signal_unsafe` will be invoked on sigsegv
-       fun receive_signal_unsafe(signal: Int) `{
-       `}
+       fun receive_signal_unsafe(signal: Int) do end
 
        # Set the receiver as the handler of the signal
        #