Adding client_server NSConnection example

X. NU/custom/mach_ipc/client_server_NSConnection/Makefile

@@ -0,0 +1,15 @@
+CC = clang
+CFLAGS = -framework Foundation
+
+all: client server
+
+client: client.m
+	$(CC) $(CFLAGS) client.m -o client
+
+server: server.m
+	$(CC) $(CFLAGS) server.m -o server
+
+clean:
+	rm -f client server *.o
+
+.PHONY: all clean

X. NU/custom/mach_ipc/client_server_NSConnection/client.m

@@ -0,0 +1,17 @@
+#import <Foundation/Foundation.h>
+
+int main(int argc, char *argv[]) {
+    @autoreleasepool {
+        if (argc != 2) {
+            NSLog(@"Usage: %s <message>", argv[0]);
+            return 1;
+        }
+        
+        NSConnection *connection = [NSConnection connectionWithRegisteredName:@"com.crimson.message_service" host:nil];
+        id<NSObject> server = [connection rootProxy];
+        
+        NSString *message = [NSString stringWithUTF8String:argv[1]];
+        [server handleMessage:message];
+    }
+    return 0;
+}

X. NU/custom/mach_ipc/client_server_NSConnection/server.m

@@ -0,0 +1,22 @@
+#import <Foundation/Foundation.h>
+
+@interface MessageServer : NSObject
+- (void)handleMessage:(NSString *)message;
+@end
+
+@implementation MessageServer
+- (void)handleMessage:(NSString *)message {
+    NSLog(@"Received: %@", message);
+}
+@end
+
+int main() {
+    @autoreleasepool {
+        MessageServer *server = [[MessageServer alloc] init];
+        NSConnection *connection = [NSConnection defaultConnection];
+        [connection setRootObject:server];
+        [connection registerName:@"com.crimson.message_service"];
+        [[NSRunLoop currentRunLoop] run];
+    }
+    return 0;
+}