Background I have a SwiftUI app that uses OSLog and the new Logger framework. In my SwiftUI views, I would like to use something like Self._logChanges() to help debug issues. After some trial and error, I can see the messages appear in the System console log for the app I am debugging using the com.apple.SwiftUI subsystem. Problem I'd like to see those same messages directly in Xcode's console window so I can filter them as needed. How do I do that? Thanks! -Patrick

We use OSLog to log message in our iOS app and retrieve logs to save into local file when app goes to background. This way we will be able to persist logs after app terminated. However, when logs become large, retrieving logs takes more than 5 seconds during background transition that cause our app being killed by the system with below info: Exception Type: EXC_CRASH (SIGKILL) Exception Codes: 0x0000000000000000, 0x0000000000000000 Termination Reason: FRONTBOARD 2343432205 <RBSTerminateContext| domain:10 code:0x8BADF00D explanation:scene-update watchdog transgression: app<com.cisco.secureclient.zta(B7AB7300-8A17-4C71-88BC-BA3D55AF6666)>:1261 exhausted real (wall clock) time allowance of 10.00 seconds ProcessVisibility: Background ProcessState: Running WatchdogEvent: scene-update WatchdogVisibility: Background WatchdogCPUStatistics: ( "Elapsed total CPU time (seconds): 13.500 (user 10.890, system 2.610), 21% CPU", "Elapsed application CPU time (seconds): 2.119, 3% CPU" ) reportType:CrashLog maxTerminationResistance:Interactive> Triggered by Thread: 0 Thread 0 name: Dispatch queue: com.apple.main-thread Thread 0 Crashed: 0 libsystem_kernel.dylib 0x1ed6e01d8 mach_msg2_trap + 8 1 libsystem_kernel.dylib 0x1ed6dff70 mach_msg2_internal + 80 2 libsystem_kernel.dylib 0x1ed6dfe88 mach_msg_overwrite + 436 3 libsystem_kernel.dylib 0x1ed6dfcc8 mach_msg + 24 4 libdispatch.dylib 0x1aea4df00 _dispatch_mach_send_and_wait_for_reply + 540 5 libdispatch.dylib 0x1aea4e2a0 dispatch_mach_send_with_result_and_wait_for_reply + 60 6 libxpc.dylib 0x20fd406d0 xpc_connection_send_message_with_reply_sync + 264 7 Foundation 0x1a5ad96c0 NSXPCCONNECTION_IS_WAITING_FOR_A_SYNCHRONOUS_REPLY + 16 8 Foundation 0x1a5ac13bc -[NSXPCConnection _sendInvocation:orArguments:count:methodSignature:selector:withProxy:] + 2160 9 Foundation 0x1a5aec6cc -[NSXPCConnection _sendSelector:withProxy:arg1:] + 116 10 Foundation 0x1a5aec604 _NSXPCDistantObjectSimpleMessageSend1 + 60 11 OSLog 0x1f4b98118 -[OSLogCurrentProcessEnumerator nextObject] + 192 12 libswiftOSLog.dylib 0x213983270 OSLogStore.PrivateIterator.next() + 32 13 libswiftOSLog.dylib 0x213983324 protocol witness for IteratorProtocol.next() in conformance OSLogStore.PrivateIterator + 28 14 libswiftCore.dylib 0x1a0050ed0 _IteratorBox.next() + 108 15 MyApp 0x104359e28 static MyLogger.getFormattedLogs() (in MyApp ) (MyLogger.swift:63) + 122408 Here is our code to retrieve logs: struct MyLogger { public var log: Logger init(subsystem: String = getSubsystem(), file: String = #file, function: String = #function, line: Int = #line, context: String = "myapp") { let category = "\(context): \(file): \(line): \(function): " log = Logger(subsystem: subsystem, category: category) } static func getFormattedLogs() -> [String] { do { // Combine log message with timestamp and category with // file/line/function information let df = DateFormatter() df.dateFormat = ZtaConstants.DATE_FORMAT let store = try OSLogStore.init(scope: .currentProcessIdentifier) let logEntries = try store.getEntries() .compactMap{ $0 as? OSLogEntryLog} .filter { $0.subsystem.contains(getSubsystem() } .map{df.string(from: $0.date) + " " + String(format:"0x%02x", $0.threadIdentifier) + " " + String(format:"0x%x", $0.activityIdentifier) + " " + String($0.processIdentifier) + " " + $0.category + " " + $0.composedMessage} return formattedLogs } catch let err { ZtaLogger().log.error("Failed to collect log: \(err)") return [] } } } It looks like getFormattedLogs() takes long time because we use filter to get message that logged by our app and format the log entry. Since compactMap is O(m+n) complexity, filter and map are O(n) that cause performance issue. Is there a better way to get logs from our app via OSLog? Could retrieving logs be called in appDidEnterBackground()? Thanks, Ying

I'm having an issue with logging on my system (Sonoma 14.3.1), in that log messages disappear after 60-90 seconds, despite logging being configured to persist. This seems to happen across all subsystems. The symptoms are: • Watching the log stream in Console.app, messages older than 60-90 seconds disappear, even if no new messages are coming in. • log show --last 2d only returns messages from the last couple of minutes. I've filed FB13616761, but wondered if anyone had any other insights or suggestions. TIA

Hi Team, I am creating an application which is based on tele communications testing where I need to retrieve the SIP logs from the device. How can we achieve? Any approach apple team suggest which will be highly appreciated. Thank You, Vijay

I'm trying to figure out how to maximize the value of structured logging in my project. The log filtering improvements in Xcode 15 are great but limited to being able to control the logging at a fine-grained level. For example, if I want to always disable some chatty debug logs for a specific category. Setting OSLogPreference solves this problem once you've installed it onto a device, but when running in debug mode on Xcode, it seems to ignore this and print everything. Is there a way to apply OSLogPreference while running Xcode, or another way to selectively disable categories?

Hi folks, For accessing the logs, I’m using OSLogStore object. I want to be able to read logs from any previous run of my application. I can of course do this: // Open the log store. var logStore = try OSLogStore(scope: .currentProcessIdentifier) But this only allows me to retrieve logs from my current running process. I can also do this: // Open the log store. var logStore = try OSLogStore(scope: .system) But this only works if my App Sandbox entitlement is false. I tried disabling the sandbox, and I was able to get to all the logs (which is good) but according to this page: https://developer.apple.com/documentation/security/app_sandbox/ it says: To distribute a macOS app through the Mac App Store, you must enable the App Sandbox capability Since we are planning on distributing our app on the store, this presents a big problem for me. (I didn't try submitting to TestFlight to see if it's really the case). I don’t know if there are exclusions or ways around this – I don’t see an entitlement that I can add which would allow access to the logs. Does anyone know a way around this? Thanks, David

Love the new console. but every time I open a new tab, it clear the console filter. I have some info level log that is from Bluetooth and other. I want to collect those logs but I don't want those in the Console. How can I keep the filter as copied to new window tab, like the search panel.

What do I miss here? root@MacBook-Pro /tmp # sw_vers ProductName: macOS ProductVersion: 13.6.1 BuildVersion: 22G313 root@MacBook-Pro /tmp # log config --mode "level: off" root@MacBook-Pro /tmp # log config --status System mode = INFO root@MacBook-Pro /tmp # log config --mode "level: debug" root@MacBook-Pro /tmp # log config --status System mode = DEBUG root@MacBook-Pro /tmp # log config --mode "level: off" root@MacBook-Pro /tmp # log config --status System mode = DEBUG

Our application (which happens to run in an admin account, thus there's no problem authenticating) collects logs calling /usr/bin/log through NSTask. Usually this works all right, but sometimes all we get is the header Timestamp Thread Type Activity PID TTL and nothing else. The tool finishes with a zero result code, we get nothing on stderr and just the header above on stdout, with a proper EOF (as determined by a zero-length availableData read from an NSFileHandle through the stdout pipe). At the same moment, if the /usr/bin/log tool is run manually in a Terminal window with precisely the same arguments in the same user account the application runs in, we get the logs all right. Any idea what might be the culprit and how to fix the problem? Thanks!

If I create a new project with the following code in main.swift and then Profile it in Instruments with the CPU Profiler template, nothing is logged in the Points of Interest category. I'm not sure if this is related to the recent macOS 14.2 update, but I'm running Xcode 15.1. import Foundation import OSLog let signposter = OSSignposter(subsystem: "hofstee.test", category: .pointsOfInterest) // os_signpost event #1 signposter.emitEvent("foo") // os_signpost event #2 signposter.withIntervalSignpost("bar") { print("Hello, World!") } If I change the template to the System Trace template and profile again, then the two os_signpost events show up as expected. This used to work before, and this is a completely clean Xcode project created from the macOS Command Line Tool template. I'm not sure what's going on and searching for answers hasn't been fruitful. Changing the Bundle ID doesn't have any effect either.

I am trying to wrap os_log for logging in my iOS app like so: import Foundation import OSLog enum LogCategory: String, CaseIterable { case viewCycle case tracking case api } struct Log { private static let logs = { return LogCategory.allCases .reduce(into: [LogCategory: OSLog]()) { dict, category in dict[category] = OSLog(subsystem: Bundle.main.bundleIdentifier ?? "BIMB", category: category.rawValue) } }() static func debug(category: LogCategory, message: StaticString, _ args: CVarArg...) { logImpl(category: category, message: message, type: .debug, args) } static func info(category: LogCategory, message: StaticString, _ args: CVarArg...) { logImpl(category: category, message: message, type: .info, args) } static func notice(category: LogCategory, message: StaticString, _ args: CVarArg...) { logImpl(category: category, message: message, type: .default, args) } static func warning(category: LogCategory, message: StaticString, _ args: CVarArg...) { logImpl(category: category, message: message, type: .default, args) } static func error(category: LogCategory, message: StaticString, _ args: CVarArg...) { logImpl(category: category, message: message, type: .error, args) } static func critical(category: LogCategory, message: StaticString, _ args: CVarArg...) { logImpl(category: category, message: message, type: .fault, args) } private static func logImpl(category: LogCategory, message: StaticString, type: OSLogType, _ args: CVarArg...) { guard let log = logs[category] else { return } os_log(message, log: log, type: type, args) } } The problem is if I did this: Log.debug(category: .tracking, message: "Device ID: %s.", UIDevice.current.identifierForVendor?.uuidString ?? "unknown") it always crashed with this error: 2023-12-13 12:33:35.173798+0700 bimb-authenticate-ios[62740:928633] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[Swift.__SwiftDeferredNSArray UTF8String]: unrecognized selector sent to instance 0x600000dcbbc0' But if I just do it with os_log like this: os_log("Device ID: %s.", log: OSLog(subsystem: Bundle.main.bundleIdentifier!, category: "tracking"), type: .debug, UIDevice.current.identifierForVendor?.uuidString ?? "unknown") it worked fine. Also if I changed %@ in my wrapper instead, it didn't crash, but the idfv is shown inside a pair of brackets like this: Device ID: ( "C0F906C8-CD73-44F6-86A1-A587248680D3" ).` But with os_log it is shown normally like this: Device ID: C0F906C8-CD73-44F6-86A1-A587248680D3. Can you tell me what's wrong here? And how do I fix this? Thanks. NOTE: This is using os_log since the minimum version is iOS 11. I don't know why people advising me with using Logger instead.

For awhile I've wrapped OSLog in my own macros to include the line number and source file the logging statement originates from in debug mode because OSLog didn't include that info in console output (until recently). Now I noticed the source code file and line number of the logging statement isn't being shown (I have all the metadata switches turned on in Xcode's console "Metadata Options" popover). Then I realized it is being shown, only on mouse hover over the logging statement in very tiny text. The text is barely readable (on mouse hover). Why would viewing the line number require me to move the mouse cursor over a logging statement? It doesn't look pretty at all (hiding information behind mouse hover) and even if it did look pretty, this is the console for programmers and we don't care about such nonsense.

I'm finding that in Xcode 15, NSLog statements (from Objective-C, in this case) will sometimes appear in Xcode's Console and sometimes will not. This is making it difficult to debug using our existing logging, which for our REST API requests and responses has been working well for about ten years and is a tough thing to lose. Is there any way I can restore reliable handling of NSLog in Xcode 15's Console without having to rewrite all (over 200) of our uses of NSLog to use OSLog? Note: I am aware that Xcode 15's Console sometimes takes more than 30 seconds to start tracking app output, but it appears that in some cases the content of individual NSLog statements never will appear. (If this 30 second delay is news to anyone, it may be related to a spam of identical warnings that are okay which occur on launch of our app. I have suspected that Xcode 15 just gets a bit flustered with identical messages and gives up for a bit.) Thank you!

I regularly talk to developers debugging hard-to-reproduce problems. I have some general advice on that topic. I’ve posted this to DevForums before, and also sent similar info to folks who’ve opened a DTS incident, but I figured I should write it down properly. If you have questions or comments, put them in a new thread here on DevForums. Put it in the Developer Tools & Services > General topic area and tag it with Debugging. Share and Enjoy — Quinn “The Eskimo!” @ Developer Technical Support @ Apple let myEmail = "eskimo" + "1" + "@" + "apple.com" Using a Sysdiagnose Log to Debug a Hard-to-Reproduce Problem Some problems are hard to reproduce in your office. These usually fall into one of two categories: Environment specific — This is where some of your users can easily reproduce the problem, but you can’t reproduce it in your environment. Intermittent — In this case the problem could affect any user, but it’s hard to predict when a given user will see the problem. A key tool in debugging such problems is the sysdiagnose log. This post explains how to make this technology work for you. IMPORTANT A sysdiagnose log might contain private information. If you ask a user to send you a log, make sure they understand the privacy impact of that. If you want to see how Apple handles this, run the sysdiagnose command on a fresh Mac and read through it’s initial prompt. Sysdiagnose Logs All Apple platforms can generate sysdiagnose logs. For instructions on how to do this, see our Bug Reporting > Profiles and Logs page. The resulting log is a .tar.gz file. Unpacking that reveals a bunch of files. The most critical of these is system_logs.logarchive, which is a snapshot of the system log. For more information about the system log, including links to the documentation, see Your Friend the System Log. This log snapshot includes many thousands of log entries (I just took a log snapshot on my Mac and it had 22.8 million log entries!). That can be rather daunting. To avoid chasing your tail, it pays to do some preparation. Preparation The goal here is to create a set of instructions that you can give to your user to capture an actionable sysdiagnose log. That takes some preparation. To help orient yourself in the log, add log points to your code to highlight the problem. For example, if you’re trying to track down a keychain problem where SecItemCopyMatching intermittently fails with errSecMissingEntitlement ( -34018 ), add a log point like this: import os.log let log = Logger(subsystem: "com.example.waffle-varnish", category: "keychain") func … { let err = SecItemCopyMatching(…) log.log("SecItemCopyMatching failed, err: \(err)") } When you look through a log, find this specific failure by searching for SecItemCopyMatching failed, err: -34018. You might also add log points at the start and end of an operation, which helps establish a time range of interest. Log points like this have a very low overhead and it’s fine to leave them enabled in your released product. However, in some cases you might want to make more extensive changes, creating a debug build specifically to help investigate your problem. Think about how you’re going to get that debug build to the affected users. You might, for example, set up a special TestFlight group for folks who’ve encountered this issue. Go to Bug Reporting > Profiles and Logs and look for debug profiles that might help your investigation. For example, if you’re investigating a Network Extension issue, the VPN (Network Extension) debug profile will enable useful debug logging. Now craft your instructions for your user. Include things like: Your take on the privacy impact on this Instructions on how to get the necessary build of your product If there’s a debug profile, instructions on how to install that Instructions on how to trigger the sysdiagnose log And on how to send it to you IMPORTANT Make sure to stress how important it is that the user triggers the sysdiagnose immediately after seeing the problem. Finally, test your steps. Do an initial test in your office, to make sure that the log captures the info you need. Then do an end-to-end test with someone who’s about as technically savvy as your users, to make sure that your instructions make sense to Real People™. Prompting for a Sysdiagnose Log In some cases it might not be obvious to the user when to trigger a sysdiagnose log. Imagine you’re hunting the above-mentioned errSecMissingEntitlement error and it only crops up when your product is performing some task in the background. The user doesn’t see that failure, they’re not even running your app!, so they don’t know that action is required. A good option here is to add code to actively monitor for the failure and post a local notification requesting that the user trigger a sysdiagnose log. Continuing the above example, you might write code like this: func … { let err = SecItemCopyMatching(…) log.log("SecItemCopyMatching failed, err: \(err)") if err == errSecMissingEntitlement { … post a local notification … } } Obviously this is quite intrusive so, depending on the market for your product, you might not want to deploy this to all users. Perhaps you can restrict it to your internal testers, or your external beta testers, or a particularly savvy set of customers. You can use the applefeedback URL scheme to make it easy for users to run Feedback Assistant. For more info about that, see Developer > Bug Reporting. Looking at the System Log Once you have your sysdiagnose log, unpack it and open the system log snapshot (system_logs.logarchive) in Console. The hardest part is knowing where to start. That’s why adding your own log entries, as discussed in Preparation, is so important. A good general process is: Search for log entries from your subsystem. An easy way to initiate that search is to paste the text subsystem:SSS, where SSS is your subsystem, into the Search field. Continuing the above example, find that log entry by pasting in subsystem:com.example.waffle-varnish. Identify the log entry that indicates the problem and select it. Then remove your search and work backwards through the log looking for system log entries related to your issue. The relevant log entries might not be within the time range shown by Console. Customise that by selecting values from the Showing popup in the pane divider. Once you have a rough idea of the timeframe involved, select Custom from that popup to focus on that range. If the log is showing stuff that’s not relevant to your problem, Console has some great facilities for filtering those out. For the details, choose Help > Console Help. Talk to Apple A key benefit of this approach is that, if your investigation suggests that this is a system bug, you can file a bug report and attach this sysdiagnose log to it. The setup described above is exactly the sort of info needed to analyse the bug. Likewise, if you start a thread here on DevForums about your issue, your friendly neighbourhood DTS engineer will find that sysdiagnose log very handy. Revision History 2024-11-14 Added a reference to the applefeedback URL scheme. Made other minor editorial changes. 2023-10-13 First posted.

Hi. I want to use OSLog. It is working as expected inside my controller. I can view all details in the console and can use "jump to source" and it jumps to the source code :) NICE If I call this inside a package in side a static func like this Package Example: import OSLog class A { static func testLog(meesage: String) { Logger(subsystem: "Test", category: "console").info("\(message)") } } I can the message inside the console but "Jump to soure" is not working. Only a ? appears on screen. Did I miss anything ?

I have os_log statements in my app. With my phone connected to the Mac, when I run the app through XCode, open Console app, those logs are shown. However, when I'm launching the app on its own, those logs don't appear in Console (phone still connected). Am I missing something very basic? Please help.

The unified system log on Apple platforms gets a lot of stick for being ‘too verbose’. I understand that perspective: If you’re used to a traditional Unix-y system log, you might expect to learn something about an issue by manually looking through the log, and the unified system log is way too chatty for that. However, that’s a small price to pay for all its other benefits. This post is my attempt to explain those benefits, broken up into a series of short bullets. Hopefully, by the end, you’ll understand why I’m best friends with the system log, and why you should be too! If you have questions or comments about this, start a new thread and tag it with OSLog so that I see it. Share and Enjoy — Quinn “The Eskimo!” @ Developer Technical Support @ Apple let myEmail = "eskimo" + "1" + "@" + "apple.com" Your Friend the System Log Apple’s unified system log is very powerful. If you’re writing code for any Apple platform, and especially if you’re working on low-level code, it pays to become friends with the system log! The Benefits of Having a Such Good Friend The public API for logging is fast and full-featured. And it’s particularly nice in Swift. Logging is fast enough to leave log points [1] enabled in your release build, which makes it easier to debug issues that only show up in the field. The system log is used extensively by the OS itself, allowing you to correlate your log entries with the internal state of the system. Log entries persist for a long time, allowing you to investigate an issue that originated well before you noticed it. Log entries are classified by subsystem, category, and type. Each type has a default disposition, which determines whether that log entry is enable and, if it is, whether it persists in the log store. You can customise this, based on the subsystem, category, and type, in four different ways: Install a configuration profile created by Apple (all platforms). Add an OSLogPreferences property to your app’s Info.plist (all platforms). Run the log tool with the config command (macOS only) Create and install a custom configuration profile with the com.apple.system.logging payload (macOS only). When you log a value, you may tag it as private. These values are omitted from the log by default but you can configure the system to include them. For information on how to do that, see Recording Private Data in the System Log. The Console app displays the system log. On the left, select either your local Mac or an attached iOS device. Console can open and work with log snapshots (.logarchive). It also supports surprisingly sophisticated searching. For instructions on how to set up your search, choose Help > Console Help. Console’s search field supports copy and paste. For example, to set up a search for the subsystem com.foo.bar, paste subsystem:com.foo.bar into the field. Console supports saved searches. Again, Console Help has the details. Console supports viewing log entries in a specific timeframe. By default it shows the last 5 minutes. To change this, select an item in the Showing popup menu in the pane divider. If you have a specific time range of interest, select Custom, enter that range, and click Apply. Instruments has os_log and os_signpost instruments that record log entries in your trace. Use this to correlate the output of other instruments with log points in your code. Instruments can also import a log snapshot. Drop a .logarchive file on to Instruments and it’ll import the log into a trace document, then analyse the log with Instruments’ many cool features. The log command-line tool lets you do all of this and more from Terminal. The log stream subcommand supports multiple output formats. The default format includes column headers that describe the standard fields. The last column holds the log message prefixed by various fields. For example: cloudd: (Network) [com.apple.network:connection] nw_flow_disconnected … In this context: cloudd is the source process. (Network) is the source library. If this isn’t present, the log came from the main executable. [com.apple.network:connection] is the subsystem and category. Not all log entries have these. nw_flow_disconnected … is the actual message. There’s a public API to read back existing log entries, albeit one with significant limitations on iOS (more on that below). Every sysdiagnose log includes a snapshot of the system log, which is ideal for debugging hard-to-reproduce problems. For more details on that, see Using a Sysdiagnose Log to Debug a Hard-to-Reproduce Problem. For general information about sysdiagnose logs, see Bug Reporting > Profiles and Logs. But you don’t have to use sysdiagnose logs. To create a quick snapshot of the system log, run the log tool with the collect subcommand. If you’re investigating recent events, use the --last argument to limit its scope. For example, the following creates a snapshot of log entries from the last 5 minutes: % sudo log collect --last 5m For more information, see: os > Logging OSLog log man page os_log man page (in section 3) os_log man page (in section 5) WWDC 2016 Session 721 Unified Logging and Activity Tracing [1] Well, most log points. If you’re logging thousands of entries per second, the very small overhead for these disabled log points add up. Foster Your Friendship Good friendships take some work on your part, and your friendship with the system log is no exception. Follow these suggestions for getting the most out of the system log. The system log has many friends, and it tries to love them the all equally. Don’t abuse that by logging too much. One key benefit of the system log is that log entries persist for a long time, allowing you to debug issues with their roots in the distant past. But there’s a trade off here: The more you log, the shorter the log window, and the harder it is to debug such problems. Put some thought into your subsystem and category choices. One trick here is to use the same category across multiple subsystems, allowing you to track issues as they cross between subsystems in your product. Or use one subsystem with multiple categories, so you can search on the subsystem to see all your logging and then focus on specific categories when you need to. Don’t use too many unique subsystem and context pairs. As a rough guide: One is fine, ten is OK, 100 is too much. Choose your log types wisely. The documentation for each OSLogType value describes the default behaviour of that value; use that information to guide your choices. Remember that disabled log points have a very low cost. It’s fine to leave chatty logging in your product if it’s disabled by default. No Friend Is Perfect The system log API is hard to wrap. The system log is so efficient because it’s deeply integrated with the compiler. If you wrap the system log API, you undermine that efficiency. For example, a wrapper like this is very inefficient: -*-*-*-*-*- DO NOT DO THIS -*-*-*-*-*- void myLog(const char * format, ...) { va_list ap; va_start(ap, format); char * str = NULL; vasprintf(&str, format, ap); os_log_debug(sLog, "%s", str); free(str); va_end(ap); } -*-*-*-*-*- DO NOT DO THIS -*-*-*-*-*- This is mostly an issue with the C API, because the modern Swift API is nice enough that you rarely need to wrap it. If you do wrap the C API, use a macro and have that pass the arguments through to the underlying os_log_xyz macro. iOS has very limited facilities for reading the system log. Currently, an iOS app can only read entries created by that specific process, using .currentProcessIdentifier scope. This is annoying if, say, the app crashed and you want to know what it was doing before the crash. What you need is a way to get all log entries written by your app (r. 57880434). There are two known bugs with the .currentProcessIdentifier scope. The first is that the .reverse option doesn’t work (r. 87622922). You always get log entries in forward order. The second is that the getEntries(with:at:matching:) method doesn’t honour its position argument (r. 87416514). You always get all available log entries. Xcode 15 beta has a shiny new console interface. For the details, watch WWDC 2023 Session 10226 Debug with structured logging. For some other notes about this change, search the Xcode 15 Beta Release Notes for 109380695. In older versions of Xcode the console pane was not a system log client (r. 32863680). Rather, it just collected and displayed stdout and stderr from your process. This approach had a number of consequences: The system log does not, by default, log to stderr. Xcode enabled this by setting an environment variable, OS_ACTIVITY_DT_MODE. The existence and behaviour of this environment variable is an implementation detail and not something that you should rely on. Xcode sets this environment variable when you run your program from Xcode (Product > Run). It can’t set it when you attach to a running process (Debug > Attach to Process). Xcode’s Console pane does not support the sophisticated filtering you’d expect in a system log client. When I can’t use Xcode 15, I work around the last two by ignoring the console pane and instead running Console and viewing my log entries there. If you don’t see the expected log entries in Console, make sure that you have Action > Include Info Messages and Action > Include Debug Messages enabled. The system log interface is available within the kernel but it has some serious limitations. Here’s the ones that I’m aware of: Prior to macOS 14.4, there was no subsystem or category support (r. 28948441). There is no support for annotations like {public} and {private}. Adding such annotations causes the log entry to be dropped (r. 40636781). Metal shaders can log using the interface described in section 6.19 of the Metal Shading Language Specification. Revision History 2024-10-22 Added some notes on interpreting the output from log stream. 2024-09-17 The kernel now includes subsystem and category support. 2024-09-16 Added a link to the the Metal logging interface. 2023-10-20 Added some Instruments tidbits. 2023-10-13 Described a second known bug with the .currentProcessIdentifier scope. Added a link to Using a Sysdiagnose Log to Debug a Hard-to-Reproduce Problem. 2023-08-28 Described a known bug with the .reverse option in .currentProcessIdentifier scope. 2023-06-12 Added a call-out to the Xcode 15 Beta Release Notes. 2023-06-06 Updated to reference WWDC 2023 Session 10226. Added some notes about the kernel’s system log support. 2023-03-22 Made some minor editorial changes. 2023-03-13 Reworked the Xcode discussion to mention OS_ACTIVITY_DT_MODE. 2022-10-26 Called out the Showing popup in Console and the --last argument to log collect. 2022-10-06 Added a link WWDC 2016 Session 721 Unified Logging and Activity Tracing. 2022-08-19 Add a link to Recording Private Data in the System Log. 2022-08-11 Added a bunch of hints and tips. 2022-06-23 Added the Foster Your Friendship section. Made other editorial changes. 2022-05-12 First posted.

XCode version 13.2.1 I enabled os_log messages using the following code:    let myLog = OSLog(subsystem: "testing", category: "exploring")   override func viewDidLoad() {     os_log("LOGGING TEST BLAH BLAH", log: myLog)     print("Starting ViewDidLoad")     super.viewDidLoad()     os_log("LOGGING TEST BLAH BLAH", log: myLog)' ... However, I do not see anything on the XCode console - just the print ("Starting ViewDidLoad"). Is there a setting in XCode to echo messages from the logger that needs to be turned on? I understand that Logger is the preferred method now instead of os_log, but both should echo the log messages on XCode debug console from what I can tell.. Thanks!

In my sandboxed MacOS app I want to access OSLogStore programmatically to fetch logs for multi-component application (app, libraries, deriver) for further analysis. According to the documentation, - https://developer.apple.com/documentation/oslog/oslogstore/3366102-local the app should have com.apple.logging.local-storeentitlement. I have added this entitlement "by hand" to the entitlement file as I I can't find a correspondent entry in the Xcode -> Sign & Capabilities interface. When I run the app, I get Unsatisfied entitlements: com.apple.logging.local-store error and the app doesn't start. If I remove the entitlement, the app can't get access to the logd subsystem. How can I add com.apple.logging.local-store to my app? Should I request this not visible via Xcode configuration UI from apple? Thanks!

I have a Swift 3 Cocoa application that uses Apple's Unified Logging, like this: - import os class MyClass { @available(OSX 10.12, *) static let scribe = OSLog(subsystem: "com.mycompany.myapp", category: "myapp") func SomeFunction(){ if #available(OSX 10.12, *){ os_log("Test Error Message", log: MyClass.scribe, type: .error) } if #available(OSX 10.12, *){ os_log("Test Info Message", log: MyClass.scribe, type: .info) } if #available(OSX 10.12, *){ os_log("Test Debug Message", log: MyClass.scribe, type: .debug) } } }Within the Console application, both Include Info Messages and Include Debug Messages are turned on.When os_log is called, only the error type message is visible in the Console application.Using Terminal, with the command, all message types are visible in the Terminal output: -sudo log stream --level debugI've tried running the Console app as root, via sudo from the command line and the same issue occurs; no debug or info messages can be seen, even though they're set to being turned on under the Action menu.Setting system-wide logging to be debug, has no effect on the Console application output:sudo log config --mode level:debugPlease can someone tell me what I'm missing and how can I view debug and info messages in the Console application?