Update signals.c: add iOS-related signal

geth/ios.go

@@ -0,0 +1,12 @@
+// +build darwin,cgo
+
+package geth
+
+/*
+#cgo CFLAGS: -x objective-c
+#cgo LDFLAGS: -framework Foundation
+#include <stddef.h>
+#include <stdbool.h>
+extern bool StatusServiceSignalEvent( const char *jsonEvent );
+*/
+import "C"

geth/signals.c

@@ -5,10 +5,43 @@
 
 #include <stddef.h>
 #include <stdbool.h>
+#include <stdlib.h>
+#include <objc/objc.h>
+#include <objc/runtime.h>
+#include <objc/message.h>
+
+static id statusServiceClassRef = nil;
+static SEL statusServiceSelector = nil;
+
+static bool initLibrary() {
+    if (statusServiceClassRef == nil) {
+        statusServiceClassRef = objc_getClass("Status");
+        if (statusServiceClassRef == nil) return false;
+    }
+
+    if (statusServiceSelector == nil) {
+        statusServiceSelector = sel_getUid("signalEvent:");
+        if (statusServiceSelector == nil) return false;
+    }
+
+    return true;
+}
+
 
+/*!
+ * @brief Calls static method signalEvent of class GethService.
+ *
+ * @param jsonEvent - UTF8 string
+ *
+ * @note Definition of signalEvent method.
+ *  + (void)signalEvent:(const char *)json
+ */
 bool StatusServiceSignalEvent(const char *jsonEvent) {
-    // code for sending JSON notification up to iOS app
-	return true;
+    if (!initLibrary()) return false;
+
+    objc_msgSend(statusServiceClassRef, statusServiceSelector, jsonEvent);
+
+    return true;
 }
 
 #elif defined(ANDROID_DEPLOYMENT)