I'm getting "unsatisfied (Local network prohibited)" when trying accessing my local http server running on mac (http://192.168.0.12:8000/test.txt) from an app running on iPhone with iOS 18.4. That's using URLSession, nothing fancy. This is the contents of the plist file of the app: NSAppTransportSecurity NSExceptionAllowsInsecureHTTPLoads true NSAllowsArbitraryLoads true NSAllowsLocalNetworking true NSExceptionDomains 192.168.0.12 NSIncludesSubdomains true NSAllowsLocalNetworking true NSExceptionAllowsInsecureHTTPLoads true NSLocalNetworkUsageDescription Hello The app correctly "prompts" the alert on the first app run, asking if I want to access local network, to which I say yes. Afterwards I could see that Local Network is enabled in iOS settings for the app, yet getting those "Local network prohibited" errors. From testing other global IP + 'http only" sites it feels like NSAllowsArbitraryLoads no longer works as it used to work before. But specifying other test "global" HTTP-only IP addresses in NSExceptionDomains work alright, it's just the local address doesn't. I could access that IP from iOS safari with no problem. The local web site is HTTP only. Googling reveals tons of relevant hits including FAQ articles from Quinn, but whatever I tried so far based on those hits doesn't seem to work.

I'm experiencing some rare crash but only if I enable Xcode's "thread performance checker". The crash typically ends with these lines: std::_1::hash_table<std::_1::hash_value_type<long qosWaiterSignallerInvariantCheck ... and sometimes with "findPrimitiveInfoNoAssert" on the second line. I wonder if I am doing anything wrong, or is it a (hopefully known) issue in thread performance checker itself? It does look like some sort of data race bug, if to guess there's some internal dictionary that's not properly protected with a mutex or something. I'm using Xcode 16.4 running on macOS 15.5, building and running an app on iPhone with iOS 18.5. Cheers!

is this a bug that NSDateFormatter knows about leap days but not about leap seconds? let f = DateFormatter() f.timeZone = TimeZone(identifier: "UTC") f.dateFormat = "yyyy/MM/dd HH:mm:ss" // last leap year let t1 = f.date(from: "2020/02/29 00:00:00") // 2020-02-29 00:00:00 UTC // last leap second let t2 = f.date(from: "2016/12/31 23:59:60") // nil

https://developer.apple.com/documentation/foundation/urlcache has this: "Although URLCache instance methods can safely be called from multiple execution contexts at the same time, be aware that methods like  cachedResponse(for:) and storeCachedResponse(_:for:) have an unavoidable race condition when attempting to read or write responses for the same request." What does it mean "unavoidable"? If I put a lock (mutex / NSLock, or similar) in my wrappers on top of "cachedResponse" / "storeCachedResponse" would that avoid the mentioned race condition? Also, what do they mean by "the same request"? A few examples below: let url = URL(string: "https://www.apple.com")! let req1 = URLRequest(url: url) let req2 = req1 // perhaps "the same" let req3 = URLRequest(url: url) // "the same"? let req4 = URLRequest(url: req1.url!) // "the same"? let req5 = URLRequest(url: url, cachePolicy: req1.cachePolicy, timeoutInterval: req1.timeoutInterval) // "the same"? let req6 = URLRequest(url: url, cachePolicy: req1.cachePolicy, timeoutInterval: 1234) // "the same"? let req7 = URLRequest(url: url, cachePolicy: .reloadIgnoringCacheData, timeoutInterval: req1.timeoutInterval) // "the same"? assert(req1 == req2) assert(req1 == req3) assert(req1 == req4) assert(req1 == req5) assert(req1 == req6) // this is ok assert(req1 == req7) // this fails

Given an arbitrary memory address how do I find (in runtime) the nature of memory block it belongs to? For stack addresses I guess there's some "stack start" and "stack end" of the current thread. For other threads' stacks - I guess I'd have to enumerate all threads to get those ranges. I also found that I can use malloc_size and sometimes it gives me correct result (the size if non zero at least), although it doesn't give me the beginning of the block memory address belongs to. For anything else I have no clue at the moment. Ideal method I am looking for: struct MemoryBlock { let type: MemoryBlockType // stack, heap, unmapped, etc let start: UnsafeRawPointer let size: Int let attributes // e.g. red / write } func findMemoryBlock(_ address: UnsafeRawPointer) -> MemoryBlock PS. the language doesn't matter (e.g. can be C) so long as this method works in a swift/obj-c app.

Using CoreBluetooth I am getting these values from CBCentralManagerDelegate's didDiscover peripheral delegate method: kCBAdvDataTxPowerLevel: 12 (could be other number like 7, 0 or a small negative number) This one is taken from advertisementData parameter. This key might be absent. rssi: -68 (or -60, -100, etc) this is taken from the "rssi" parameter (always present). I am looking for a formula to calculate approximate distance based on these two numbers. Is that possible? I know that ideally I need to know rssi0 (rssi at 1 meter), but I don't see how I can get that via CoreBluetooth API or other means (without actually measuring rssi at one meter distance which is not good for me). How could I approximate rssi0 value with "kCBAdvDataTxPowerLevel"?

While playing with this app I found something odd: let dylib1 = dlopen("/System/Library/Frameworks/CreateMLComponents.framework/CreateMLComponents", O_RDONLY)! let s1 = dlsym(dylib1, "CreateMLComponentsVersionString")! var info1 = Dl_info() let success1 = dladdr(s1, &info1) precondition(success1 != 0) print(String(cString: info1.dli_sname!)) // CreateMLComponentsVersionString let path1 = String(cString: info1.dli_fname!) print(path1) // /System/Library/Frameworks/CreateMLComponents.framework/Versions/A/CreateMLComponents let exists1 = FileManager.default.fileExists(atPath: path1) print(exists1) // true let dylib2 = dlopen("/System/Library/Frameworks/Foundation.framework/Foundation", O_RDONLY)! let s2 = dlsym(dylib2, "NSAllocateMemoryPages")! // var info2 = Dl_info() let success2 = dladdr(s2, &info2) precondition(success2 != 0) print(String(cString: info2.dli_sname!)) // NSAllocateMemoryPages let path2 = String(cString: info2.dli_fname!) print(path2) // /System/Library/Frameworks/Foundation.framework/Versions/C/Foundation let exists2 = FileManager.default.fileExists(atPath: path2) print(exists2) // false The app runs fine and prints true for exists1 and false for exists2. That means that while both dlsym calls succeed and both dladdr calls return paths (within CreateMLComponents.framework and Foundation.framework correspondingly) the first file exists while the second file doesn't exist. This raises quite a few questions: Why some of the dylib files (in fact – most dylibs inside /System/Library/Frameworks hirerarchy) don't exist at the expected locations? Why do we have symbolic link files (like Foundation.framework/Foundation) that point to those non-existent locations? What is the purpose of those symbols links? Where are those missing dylib files in fact? They must be somewhere, no?! I guess to figure out the answer I could search the whole disk raw bytes for a particular byte pattern to know the answer but hope there's an easier way to know the truth! Why do we have some exceptional cases like "CreateMLComponents.framework" and a couple of others that don't follow the rules established by the rest? Thanks!

hello, how do i create a virtual microphone on macOS that can be selected as a default input device in System Settings or in apps like FaceTime / QuickTime Player / Skype, etc? is Audio HAL plugin the way to go? i've seen this macOS 10.15 note: "Legacy Core Audio HAL audio hardware plug-ins are no longer supported. Use Audio Server plug-ins for audio drivers." though i am not sure if that's applicable, as i can think of these interpretations: 1 "Legacy Core Audio HAL audio hardware plug-ins are no longer supported (but you can still use non-legacy ones.) 2 "Legacy Core Audio HAL audio hardware plug-ins are no longer supported." (but you can still use non-hardware ones".) 3 "Legacy Core Audio HAL audio hardware plug-ins are no longer supported". (if you used that functionality to implement audio hardware drivers then your you can use Audio Server plug-ins instead, otherwise you are screwed.) The "Audio Server plugin" documentation is minimalistic: https://developer.apple.com/library/archive/qa/qa1811/_index.html which leads to a 2013 sample code: https://developer.apple.com/library/archive/samplecode/AudioDriverExamples/Introduction/Intro.html and contains a "nullAudio" plugin and a kernel extension backed plugin - neither of those i wasn't able to resurrect (i'm on macOS Catalina now). any hints?

Am I calling this right? host_priv_t hostPriv = 0; int err = host_get_host_priv_port(mach_host_self(), &amp;hostPriv); err = host_processors(hostPriv, &amp;processorList, &amp;processorCount); host_get_host_priv_port above returns 4 "(os/kern) invalid argument". Tried with App Sandbox enabled and disabled.

I'm trying to reproduce a case when there are more dispatch queues than there are threads serving them. Is that a possible scenario?

The man page for getifaddrs states: The ifa_data field references address family specific data. For AF_LINK addresses it contains a pointer to the struct if_data (as defined in include file <net/if.h>) which contains various interface attributes and statistics. For all other address families, it contains a pointer to the struct ifa_data (as defined in include file <net/if.h>) which contains per-address interface statistics. I assume that "AF_LINK address" is the one that has AF_LINK in the p.ifa_addr.sa_family field. However I do not see "struct ifa_data" anywehere. Is this a documentation bug and if so how do I read this documentation right?

I have an iOS app that allows user to select a folder (from local Files). User is seemingly capable selecting the "On My iPhone" folder (the "Open" button is enabled, clickable and when it is tapped the app gets the relevant URL) although there's nothing in that folder apart from ".trash" item. Is selecting that folder not supported? If not why is the "Open" button enabled on that level to begin with?

Hi, Given pthread_id (†), is there a way to find the associated NSThread (when the one exists)? Perhaps using an undocumented / unsupported method – I don't mind. Thank you! (†) the pthread_id is neither of the current nor of the main thread.

Why is "fork" prohibited in sandboxed apps?

hello, i don't think it is provided by the system already so i'd like to implement a smart version of DispatchQueue.async function - the one that will not reschedule the block if i am already on the queue in question and call the block directly instead in this case.  extension DispatchQueue { func asyncSmart(execute: @escaping () -> Void) { if DispatchQueue.current === self { // ????? execute() } else { async(execute: execute) } } } the immediate problem is that there is no way to get the current queue (in order to compare it with the queue parameter and do the logic branch). anyone've been through it and solved this puzzle?