I am trying to pass an array of C-structs to an XPC Service, but the service receives only the first element. Following is the C struct struct MyStruct { char *name; unsigned char v1; unsigned char v2; Status status; // a c-style enum }; and I am using it like this struct MyStruct structs[3] = {{"name1", 0, 0, success}, {"name2", 1,1, success}, {0}}; [[_connectionToService remoteObjectProxy] doSomething:structs]; and doSomething is declared as - (void)doSomething: (struct MyStruct[]) structs; The document Creating XPC Services mentions that C structures and arrays containing only the types listed above are supported, but I am unable to get it to work even for an array of c-strings or ints. Also, there's an API for making synchronous RPC calls but there is no documentation available for it. - (id)synchronousRemoteObjectProxyWithErrorHandler:(void (^)(NSError *error))handler It does seem to block but only if the remote method has a reply block. Is this the expected behaviour? And is it safe to cache the proxy object returned by this method?

I refer to this article： https://developer.apple.com/forums/thread/129752 extension Cmd {   static func launch(tool: URL, arguments: [String], completionHandler: @escaping (Int32, Data) -> Void) throws {     let group = DispatchGroup()     let pipe = Pipe()     var standardOutData = Data()     group.enter()     let proc = Process()     proc.executableURL = tool     proc.arguments = arguments     proc.standardOutput = pipe.fileHandleForWriting     proc.terminationHandler = { _ in       proc.terminationHandler = nil       group.leave()     }     group.enter()     DispatchQueue.global().async {       // Doing long-running synchronous I/O on a global concurrent queue block       // is less than ideal, but I’ve convinced myself that it’s acceptable       // given the target ‘market’ for this code.       let data = pipe.fileHandleForReading.readDataToEndOfFile()       pipe.fileHandleForReading.closeFile()       DispatchQueue.main.async {         standardOutData = data         group.leave()       }     }     group.notify(queue: .main) {       completionHandler(proc.terminationStatus, standardOutData)     }     try proc.run()     // We have to close our reference to the write side of the pipe so that the     // termination of the child process triggers EOF on the read side.     pipe.fileHandleForWriting.closeFile()   } } run shell : try Cmd.launch(tool: URL(fileURLWithPath: "/usr/bin/which"), arguments: ["docker"]) { (status, outputData) in         let output = String(data: outputData, encoding: .utf8) ?? ""         print("done, status: \(status), output: \(output)")       } the result print： done, status: 1, output:  i had remove sandbox and use this code in my mac app. and return value is empty string. I tried running this script using https://github.com/kareman/SwiftShell and got the same result

We are noticing a strange behavior with our app and launchctl, not sure yet if it is only in M1 Monterey Macos. We have a launchctl plist that has not changed for a while that allows the app to restart after a crash via the Keepalive key <key>KeepAlive</key> <dict> <key>SuccessfulExit</key> <false/> What we are noticing is that the app crashes and instead of the app reopening via launchctl , an Apple crash report window opens. The app is used in several headless environments and we are trying to understand asap how to deal with this change of behavior. Any input will be helpful. Is there an option in xcode to modify this kind of behavior ? For example set the app to show a crash report instead of launchctl executing. Is there a way to trace why launchctl did not reopen the app ? Does it make a difference if the app is a debug version ? We have noticed no difference between Release and Debug versions, same behavior.

I have a few questions regarding daemons. Indeed, even the macos developer center has limited information resources. I want to develop an application daemon that runs after system boot without login. a) a Daemon; Is it a simple console application combined with a plist? Because there are almost no tutorials on daemon development related to xcode. If there is a code sample reference, can you share it here? b) Can daemons be downloaded from the app store? Because there must be a software that I can offer to everyone through the app store. Is the installation automatic like other app store apps? If anyone has experience and can share it, I would be very grateful. c) I am working on an api related to mirroring the screen to android phone. Do you think a daemon has full access to wifi/ble and screen capture APIs? I would be very happy to hear your suggestions.

Hi, I have a macOS application say Main.app which uses Helper App say Helper.app with UI support. Helper.app is placed inside Main.app/Contents/Library/LoginItems/Helper.app. Helper.app is launched using NSWorkSpace and when user opts to launch Helper.app on login, SMLoginItemSetEnabled is turned ON for Helper.app. Main.app and Helper.app communicate with each other via NSConnection.  Helper app supports set of features based on some Condition and same condition is used to validate a feature in Main.app. Hence, Main.app talks to Helper.app to check if a feature can be validated. 1) Can someone write their version of Helper.app with same bundle identifier as my Helper.app and expose a connection with same name (when my Main.app and Helper.app is not running). 2) Now when Main.app is launched, it get connected to 3rd party Helper.app. There are two versions of Main.app Main.app and Helper.app both are sandboxed and Belong to same group. Main.app and Helper.app both are not sandboxed (But, hardened run time is enabled). Groups are not defined. Thank you. Regards, Deepa

Hi! I wrote a backup console application. It does use ssh/sshfs to access a web server via public key. Also it does send an SMTP-mail when finished. If the process is started via launchctl load DAEMON it works always properly (RunAtLoad is true). But when the daemon is called automatically at night it does not always work. In my log I get these errors: ssh: connect to host SERVERURL port 22: Undefined error: 0 and Failed sending: NIOConnectionError(host: "mail.mydomain", port: 25, dnsAError: Optional(NIOCore.SocketAddressError.unknown(host: "mail.mydomain", port: 25)), dnsAAAAError: Optional(NIOCore.SocketAddressError.unknown(host: "mail.mydomain", port: 25)), connectionErrors: []) it does run on a MacMini M1 with macOS 12.2. Any clue what's wrong or how to find the reason of this issue? PS. On another MacMini (Intel) with macOS 11.6 the backup works since a year but there is always an admin user logged in.

We define an event handler for OpenURL NSAppleEventManager *appleEventManager = [NSAppleEventManager sharedAppleEventManager]; [appleEventManager setEventHandler:self andSelector:@selector(handleGetURLEvent:withReplyEvent:) forEventClass:kInternetEventClass andEventID:kAEGetURL]; And we handle it here: (void)handleGetURLEvent:(NSAppleEventDescriptor *)event            withReplyEvent:(NSAppleEventDescriptor *)replyEvent { // Handler type stuff } If I'm debugging in Xcode, I see a SIGCONT before the handler is called. When I continue from the SIGCONT, I enter the handler and everything is fine. This causes automated tests to break, and is generally a pain in the you-know-where. Outside of Xcode it's fine. How can I make it stop doing this? Is there some Xcode setting I've overlooked?

and how to access the metadata ?

This question came from https://developer.apple.com/forums/thread/695826, where I saw crashes in AppKit if called without a GUI session. What troubles me from there is that our code is registered as a LaunchAgent (under /Library/LaunchAgents), and I was under the impression that a LaunchAgent only runs if a user logs into a GUI session. I tried at least ssh-only sessions and didn't see it launch automatically (I had to manually launch it through ssh to reproduce the crash). But the fact that we see thousands of crash reports coming from a few devices means somehow our LaunchAgent is trying to launch itself automatically & repeatedly on these devices, while there is no GUI session so it keeps crashing. So, maybe there is a legit way to reproduce the scenario, to launch a LaunchAgent without a GUI session that I'm not aware of?

As per my research I found that there is no way to open general settings app but it is possible with openSettingsURLString. Can I use openURL API with options to open general settings? And also how can we request iOS API team to provide such support in future as this is so many time generated request.

I have a use case in which I have a launch daemon (as the XPC service) than needs to communicate with two XPC clients. Each of these clients has different functional cases for communication that do not overlap. Therefore, the NSXPCInterface for client A would be configured with a different protocol than the NSXPCInterface that would be configured for client B. Client A and Client B do not need to talk to each other; they each just need to communicate with the daemon. I am confused how to appropriately set up the NSXPCListener and NSXPCListenerDelegate on the daemon to support NSXPCConnections with proxy objects that adhere to varying interfaces to support these two clients. Is there a way for a single NSXPCListener (and associated delegate) to listen for connections requiring the exportedInterface to be different? Is there a way to send data through the NSXPCConnection that will allow the NSXPCListenerDelegate to conditionally determine which exported interface and object to configure? One idea I had was to have the daemon contain two NSXPCListeners. Each listener would be responsible for connections coming from the respective clients. Will this option work? If so, it is the advisable approach?

I'd like to get an indication about the context in which my process is running from. I'd like to distinguish between the following cases : It runs as a persistent scheduled task (launchDaemon/launchAgent) It was called on-demand and created by launchd using open command-line or double-click. It was called directly from command-line terminal (i.e. > /bin/myProg from terminal ) Perhaps is there any indication about the process context using Objective-c/swift framework or any other way ? I wish to avoid inventing the wheel here :-) thanks

Hi, In our system we have a launch daemon that manages a child process that performs networking. We also have launch agents that perform GUI work in each user session. We'd like those agents to connect to the child process of the launch daemon via XPC. In the launchd.plist we can expose a MachServices port for the launch daemon itself but how do we expose a port for the child process? Is it possible for the Launch daemon to smuggle a declared port to its child process? Thanks! Johan

Hi, We are creating a macOS application that is built as a 'Bundle' and NOT as a Unix-style application. In a specific flow, we need to attach this process to a terminal session by creating one. Now, on this attached terminal, stdin/stdout etc would happen. We are using Objective C. Any pointers on how to go about this would be helpful.

I had my daemon service registered ( with keepalive true) to Mac OS and running in Catalina, after I upgraded to Bigsur the daemon did not start. when I tried to start manually I found that the daemon has been disabled. I had to load the daemon service with '-w' to enable it. in a customer machine, we cant ask them to do it manually. is there any way to stop disabling a daemon service during an upgrade to bigsur?

I have a Safari Web Extension that communicates with its native App through UserDefaults within an App Group. The WebExtensionHandler is also used to carry out other functions for the Web Extension on request. I am currently troubleshooting a bug where a request from the Extension to the WebExtensionHandler remains unanswered. The bug only occurs on physical devices, in the simulator, it always behaves as expected. When XCode is attached to the App or App Extension process, the bug also does not trigger. When the Console App is used to monitor events on the device, the bug also does not trigger. Here is the code for the WebExtensionHandler: import SafariServices func respondWith(_ context: NSExtensionContext, string: String) { let response = NSExtensionItem() response.userInfo = [ SFExtensionMessageKey: string ] context.completeRequest(returningItems: [response], completionHandler: nil) } class SafariWebExtensionHandler: NSObject, NSExtensionRequestHandling { var sharedPrefs = UserDefaults.init(suiteName: "group.eu.waiyu.app")! func beginRequest(with context: NSExtensionContext) { let item = context.inputItems[0] as! NSExtensionItem let message = item.userInfo?[SFExtensionMessageKey] as! Dictionary<String,Any> switch message["type"] as! String { // other cases... case "get_config": if let config = sharedPrefs.string(forKey: "config") { respondWith(context, string: config) } else { let defaultConfig = message["defaultConfig"]! respondWith(context, string: defaultConfig as! String) } default: respondWith(context, string: "Unknown Message type") } } } Even though it appears that something goes wrong when accessing sharedPrefs when the bug is triggered, other requests are answered correctly (before and after triggering the bug). As per some solutions to similar issues (https://stackoverflow.com/questions/38275395/failed-to-read-values-in-cfprefsplistsource-ios-10) I have tried different App Group IDs: the main Bundle ID, prefixed with "group." an ID different from both main bundle and extension bundle, prefixed with "group." "group.TEAMID." prefix (TEAMID being the developer team id) Is there anything I can try with regards to the code? Are there any other debugging workflows I can try that do not involve attaching to the device, that might allow me to capture more information about the bug?