1 files changed, 39 insertions, 0 deletions
diff --git a/src/event_tap.c b/src/event_tap.c
new file mode 100644
index 0000000..5f44ff4
--- /dev/null
+++ b/src/event_tap.c
@@ -0,0 +1,39 @@
+#include "event_tap.h"
+
+bool event_tap_enabled(struct event_tap *event_tap)
+{
+    bool result = (event_tap->handle && CGEventTapIsEnabled(event_tap->handle));
+    return result;
+}
+
+bool event_tap_begin(struct event_tap *event_tap, event_tap_callback *callback)
+{
+    event_tap->handle = CGEventTapCreate(kCGSessionEventTap,
+                                         kCGHeadInsertEventTap,
+                                         kCGEventTapOptionDefault,
+                                         event_tap->mask,
+                                         callback,
+                                         event_tap);
+
+    bool result = event_tap_enabled(event_tap);
+    if(result) {
+        event_tap->runloop_source = CFMachPortCreateRunLoopSource(kCFAllocatorDefault,
+                                                                  event_tap->handle,
+                                                                  0);
+        CFRunLoopAddSource(CFRunLoopGetMain(), event_tap->runloop_source, kCFRunLoopCommonModes);
+    }
+
+    return result;
+}
+
+void event_tap_end(struct event_tap *event_tap)
+{
+    if(event_tap_enabled(event_tap)) {
+        CGEventTapEnable(event_tap->handle, false);
+        CFMachPortInvalidate(event_tap->handle);
+        CFRunLoopRemoveSource(CFRunLoopGetMain(), event_tap->runloop_source, kCFRunLoopCommonModes);
+        CFRelease(event_tap->runloop_source);
+        CFRelease(event_tap->handle);
+        event_tap->handle = NULL;
+    }
+}