Adding client_server NSMachPort example

X. NU/custom/mach_ipc/client_server_NSMachPort/Makefile

@@ -0,0 +1,13 @@
+CC=clang
+FRAMEWORKS=-framework Foundation
+
+all: server client
+
+server: server.m
+	$(CC) $(FRAMEWORKS) server.m -o server
+
+client: client.m
+	$(CC) $(FRAMEWORKS) client.m -o client
+
+clean:
+	rm -f server client

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

@@ -0,0 +1,19 @@
+// client.m
+#import <Foundation/Foundation.h>
+#import <servers/bootstrap.h>
+
+int main(int argc, char *argv[]) {
+    @autoreleasepool {
+        if (argc != 2) return 1;
+        
+        mach_port_t bp, port;
+        task_get_bootstrap_port(mach_task_self(), &bp);
+        bootstrap_look_up(bp, "com.crimson.message_service", &port);
+        
+        NSMachPort *machPort = [[NSMachPort alloc] initWithMachPort:port];
+        NSData *data = [[NSString stringWithUTF8String:argv[1]] dataUsingEncoding:NSUTF8StringEncoding];
+        NSMutableArray *components = [NSMutableArray arrayWithObject:data];
+        [machPort sendBeforeDate:[NSDate date] msgid:0 components:components from:nil reserved:0];
+    }
+    return 0;
+}

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

@@ -0,0 +1,31 @@
+// server.m
+#import <Foundation/Foundation.h>
+#import <servers/bootstrap.h>
+
+@interface Server : NSObject <NSMachPortDelegate>
+@end
+
+@implementation Server
+- (void)handlePortMessage:(NSPortMessage *)message {
+    NSData *data = [[message components] firstObject];
+    NSString *msg = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
+    NSLog(@"Received: %@", msg);
+}
+@end
+
+int main() {
+    @autoreleasepool {
+        Server *server = [[Server alloc] init];
+        mach_port_t bp;
+        task_get_bootstrap_port(mach_task_self(), &bp);
+        mach_port_t servicePort;
+        kern_return_t kr = bootstrap_check_in(bp, "com.crimson.message_service", &servicePort);
+        if (kr != KERN_SUCCESS) return 1;
+        
+        NSMachPort *port = [[NSMachPort alloc] initWithMachPort:servicePort];
+        port.delegate = server;
+        [[NSRunLoop currentRunLoop] addPort:port forMode:NSDefaultRunLoopMode];
+        [[NSRunLoop currentRunLoop] run];
+    }
+    return 0;
+}