Explore the core architecture of the operating system, including the kernel, memory management, and process scheduling.

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More DispatchIO problems -- cleanup handler isn't called
I create a DispatchIO object (in Swift) from a socketpair, set the low/high water marks to 1, and then call read on it. Elsewhere (multi-threaded, of course), I get data from somewhere, and write to the other side of it. Then when my data is done, I call dio?.close() The cleanup handler never gets called. What am I missing? (ETA: Ok, I can get it to work by calling dio?.close(flags: .stop) so that may be what I was missing.) (Also, I really wish it would get all the data available at once for the read, rather than 1 at a time.)
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Connect to the /dev/tty.PL2303G-USBtoUART120 from Catalyst app
Hello, there are popular USB GPS receivers from GlobalSat called BU-353N5. It's shipped with driver application and works well. Once connected GPS receiver is visible as a /dev/tty.PL2303G-USBtoUART120 and produces NMEA codes there. I'm a developer of an offline maps application which is available for iOS and macOS using Mac Catalyst. Is it possible to connect to the /dev/tty* from mac catalyst app? Is there an entitlement for that? There are also driver sources available to work directly with USB device based on Prolific 2303, but before I'll try to integrate driver into the app I wan't to be sure there is no way to use an existing one.
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Anyone who encounters "hmmtrAccessoryServerStateChange" error during Matter device commissioning?
Hello. I found that my iPhone has encountered same error continuously when I tried to commission my Eve Door & Window device. Nov 12 11:33:48 iPhone homed(Matter)[181] <Error>: Can't extract public key from certificate: src/crypto/CHIPCryptoPALOpenSSL.cpp:1911: CHIP Error 0x0000002F: Invalid argument Nov 12 11:33:48 iPhone homed(Matter)[181] <Error>: convertX509Certificate: src/credentials/CHIPCertFromX509.cpp:559: CHIP Error 0x0000002F: Invalid argument Nov 12 11:33:55 iPhone homed(HomeKitMatter)[181] <Error>: [4264877660/1(3180582119)] Couldn't get device being commissioned for network scanning: (null) Nov 12 11:33:55 iPhone homed(HomeKitDaemon)[181] <Error>: No unpaired accessory for server HMMTRAccessoryServer fa:e6:88:97:2a:ee Nov 12 11:33:55 iPhone homed(HomeKitMetrics)[181] <Error>: [4264877660/1(3180582119)] tag="hmmtrAccessoryServerStateChange" desc="Error in progress state" errorDomain="MTRErrorDomain" errorCode="1" state="19" Nov 12 11:33:55 iPhone homed(HomeKitMatter)[181] <Error>: [4264877660/1(3180582119)] CHIP Accessory pairing failed: Error Domain=MTRErrorDomain Code=1, <HMMTRAccessoryPairingEndContext, Step: HMMTRAccessoryPairingStep_GettingNetworkRequirement, Error: Error Domain=MTRErrorDomain Code=1 "The operation couldn\M-b\M^@\M^Yt be completed. (MTRErrorDomain error 1.)", Sourceerrordomain: MTRErrorDomain> Is there anyone who has experienced or solved the same error as me? Thanks.
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Finder Sync Extension turning sidebar icons into generic document icons
Not able to replicate this myself but have had a couple of users report this. I have a Finder Sync Extension. It does not, at least intentionally, change any sidebar icons. The hosting app mostly uses asset catalogs and the icon file it specifies in its info.plist is a icns file, not an iconset. Any idea what may be causing this? Seems odd to me that there isn't some explicit setting to enable this instead of requiring some set of configurations lining up.
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NetFSMountURLSync won't mount my FTP volume
I would like to replace the deprecated method FSMountServerVolumeSync with the newer one NetFSMountURLSync. I can properly mount my FTP volume using "Connect to Server" in the Finder and with FSMountServerVolumeSync (the volume comes as read only, but it's ok). When I try to mount the FTP volume with NetFSMountURLSync I get this error message: "The share does not exist on the server. Please check the share name and then try again". But as I know I can't define the share on a FTP server. How can I fix this issue?
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Capture Screen pre-login contex on macOS 15 Sequoia
Hello, Since 2017 I provide a free and open source Remote Desktop for macOS, Windows and Linux that supports macOS 10.7 to macOS 15. Screen capture is done with CGDisplayCreateImage and works fine. But there is a problem on macOS 15 Sequoia I can not capture the screen in the pre-login context (I am referring to the login screen before the user access into his account). The screen capture in pre-login context works fine for all macOS versions except macOS 15 Sequoia. In last weeks I tried to fix the issue without success: tried CGDisplayStream tried AVCaptureScreenInput tried ScreenCaptureKit tried to sign the App (and executable) None of these work before the user login, but them works only when the user is logged in. Additional info: I run the App with "launch agent" when user is connected. I run the App with "launch daemon" when user is not connected. Any help would be greatly appreciated!
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BLE Module Connection Issues with iPhone 12 – Random Disconnects Every 3 Minutes
Hello, I'm using an HMSoft Bluetooth module that connects reliably to Android devices, maintaining a stable connection. However, when I try to connect it to my iPhone 12, the connection randomly disconnects after a few minutes (usually around 3 minutes). This issue occurs even when using apps like LightBlue and other BLE-based medical equipment apps, so it doesn't seem related to my app code. Any suggestions on what I can do to prevent these unexpected disconnects? Should I change any specific settings on my iPhone or the module itself?
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Under iOS18.1 and Xcode 16.1, use Matter and MatterSupport to pair Matter devices
Under iOS18.1 and Xcode 16.1, use Matter and MatterSupport to pair Matter devices. It was found that Matter over WIFI devices could not trigger the PASE process let device = try deviceController? .deviceBeingCommissioned(withNodeID: commissioningDeviceID) After some time: func controller(_: MTRDeviceController, statusUpdate status: MTRCommissioningStatus) Return failure Device logs: E (47956) chip[ZCL]: Commissioning window is currently not open I (48789) chip[EM]: <<< [E:17954r S:13425 M:26847390 (Ack:206367876)] (S) Msg TX to 1:00000000EE53575F [AE90] [UDP:[FE80::148F:AC68:D736:CA5C%st1]:58332] --- Type 0001:09 (IM:InvokeCommandResponse) E (48798) chip[DL]: Long dispatch time: 867 ms, for event type 3 I (48804) chip[EM]: >>> [E:17954r S:13425 M:206367876 (Ack:26847387)] (S) Msg RX from 1:00000000EE53575F [AE90] --- Type 0001:08 (IM:InvokeCommandRequest) I (48819) chip[EM]: <<< [E:17954r S:13425 M:26847391 (Ack:206367876)] (S) Msg TX to 1:00000000EE53575F [AE90] [UDP:[FE80::148F:AC68:D736:CA5C%st1]:58332] --- Type 0000:10 (SecureChannel:StandaloneAck) I (48838) chip[EM]: >>> [E:17954r S:13425 M:206367876 (Ack:26847387)] (S) Msg RX from 1:00000000EE53575F [AE90] --- Type 0001:08 (IM:InvokeCommandRequest) I (48851) chip[EM]: <<< [E:17954r S:13425 M:26847392 (Ack:206367876)] (S) Msg TX to 1:00000000EE53575F [AE90] [UDP:[FE80::148F:AC68:D736:CA5C%st1]:58332] --- Type 0000:10 (SecureChannel:StandaloneAck) I (48935) chip[EM]: >>> [E:17954r S:13425 M:206367877 (Ack:26847390)] (S) Msg RX from 1:00000000EE53575F [AE90] --- Type 0000:10 (SecureChannel:StandaloneAck) I (48952) chip[EM]: >>> [E:17955r S:13425 M:206367878] (S) Msg RX from 1:00000000EE53575F [AE90] --- Type 0001:0a (IM:TimedRequest) I (48957) chip[EM]: <<< [E:17955r S:13425 M:26847393 (Ack:206367878)] (S) Msg TX to 1:00000000EE53575F [AE90] [UDP:[FE80::148F:AC68:D736:CA5C%st1]:58332] --- Type 0001:01 (IM:StatusResponse) I (48998) chip[EM]: >>> [E:17955r S:13425 M:206367879 (Ack:26847393)] (S) Msg RX from 1:00000000EE53575F [AE90] --- Type 0001:08 (IM:InvokeCommandRequest) I (49019) esp_matter_command: Received command 0x00000000 for endpoint 0x0000's cluster 0x0000003C I (49019) chip[ZCL]: Received command to open commissioning window I (49025) chip[DIS]: Updating services using commissioning mode 2 I (49087) chip[DIS]: CHIP minimal mDNS started advertising. I (49093) chip[DIS]: Advertise operational node 752B90252951AE90-000000005B4AA994 I (49094) chip[DIS]: CHIP minimal mDNS configured as 'Operational device'; instance name: 752B90252951AE90-000000005B4AA994. I (49105) chip[DIS]: mDNS service published: _matter._tcp I (49109) chip[DIS]: Advertise commission parameter vendorID=5493 productID=8228 discriminator=0741/02 cm=2 I (49120) chip[DIS]: CHIP minimal mDNS configured as 'Commissionable node device'; instance name: 1D59D05DF5376A3B. I (49137) chip[DIS]: mDNS service published: _matterc._udp I (49137) chip[ZCL]: Commissioning window is now open I (49143) chip[EM]: <<< [E:17955r S:13425 M:26847394 (Ack:206367879)] (S) Msg TX to 1:00000000EE53575F [AE90] [UDP:[FE80::148F:AC68:D736:CA5C%st1]:58332] --- Type 0001:09 (IM:InvokeCommandResponse) I (49161) app_main: Commissioning window opened I (49200) chip[EM]: >>> [E:17955r S:13425 M:206367880 (Ack:26847394)] (S) Msg RX from 1:00000000EE53575F [AE90] --- Type 0000:10 (SecureChannel:StandaloneAck) I (69380) SENSOR: Temp: 236 I (69383) ACInterface: AC event ntc :236
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iOS18 crash due to "main_executable_path_missing" and "dyld"
Our app experience the strange crash,causing the app to not launch.This crash suddenly began to happen on October 25. At present, all the Hardware Model of mobile phones that occurred were on iPhone17,1 and the iOS system version was iOS18.0.1. This crash was all from users on the appstore, and was collected via Xcode - Organizer - &gt; Crashes. I've attached the crash report.Thanks Distributor ID: com.apple.AppStore Hardware Model: iPhone17,1 Process: XxxxxxXXX [31230] Path: /private/var/containers/Bundle/Application/6E9E07EA-B7A4-4D57-B419-743DDCF7C3A6/XxxxxxXXX.app/XxxxxxXXX Identifier: com.XxxxxxXXX.XxxxxxXXX Version: 8.1.10 (811001) AppStoreTools: 16A242d AppVariant: 1:iPhone17,1:18 Code Type: ARM-64 (Native) Role: unknown Parent Process: launchd [1] Coalition: com.XxxxxxXXX.XxxxxxXXX [8069] Date/Time: 2024-10-31 03:30:38.7437 +0800 Launch Time: 2024-10-31 03:30:38.7415 +0800 OS Version: iPhone OS 18.0.1 (22A3370) Release Type: User Baseband Version: 1.00.00 Report Version: 104 Exception Type: EXC_CRASH (SIGKILL) Exception Codes: 0x0000000000000000, 0x0000000000000000 Termination Reason: GUARD 5 Triggered by Thread: 0 Thread 0 Crashed: 0 dyld 0x00000001b2da32b0 lsl::PreallocatedAllocatorLayout&lt;278528ull&gt;::init(char const**, char const**, void*) + 436 (Allocator.h:537) 1 dyld 0x00000001b2d9ca38 start + 1960 (dyldMain.cpp:1289) Thread 0 crashed with ARM Thread State (64-bit): x0: 0x2010003030100000 x1: 0x0000000fffffc0d0 x2: 0x0000000000000002 x3: 0x00000001b2d717ab x4: 0x0000000000000000 x5: 0x0000000000000000 x6: 0x0000000000000000 x7: 0x0000000000000000 x8: 0x2010003030100000 x9: 0x2010003030100000 x10: 0x000000016d1dbdfb x11: 0x00000001b2dddf30 x12: 0x0000000000000050 x13: 0x0000000000000044 x14: 0x0000000000052010 x15: 0x0000000000000000 x16: 0x0000000000000000 x17: 0x0000000000000000 x18: 0x0000000000000000 x19: 0x000000018a7e0000 x20: 0x000000016d1dbb30 x21: 0x000000016d1dbad0 x22: 0x00000001f0794050 x23: 0x000000016d1db7b8 x24: 0x0000000fffffc10c x25: 0x0000000000000000 x26: 0x0000000000000000 x27: 0x0000000000000000 x28: 0x0000000000000000 fp: 0x000000016d1db850 lr: 0x00380001b2da3130 sp: 0x000000016d1db7b0 pc: 0x00000001b2da32b0 cpsr: 0x60000000 esr: 0x92000047 (Data Abort) byte write Translation fault Binary Images: 0x102c24000 - 0x1056d3fff main_executable_path_missing arm64 &lt;086a82c13b863f4485895baddc3144ba&gt; /main_executable_path_missing 0x1b2d69000 - 0x1b2dec693 dyld arm64e &lt;5db839882ee63756bd07b8d67b1133a5&gt; /usr/lib/dyld EOF 2024-10-26_17-41-58.4222_+0800-841f6bdf4b2d436606ce55595ffc94d64e9af744.crash 2024-10-26_19-44-40.1115_+0800-7d4d654c76a10108b431acc612d6063b1edb1c3e.crash 2024-10-27_17-12-02.4926_+0800-6a4b6ec4cff928cf746162b9371a3176c3667c21.crash 2024-10-28_21-42-02.6780_+0800-c66c71c13414e7ff14ba783c883730c1361523b5.crash 2024-10-29_05-47-00.3943_+0800-ac7c1f5b6caf9aa97d71744a8f980c32d47eab80.crash 2024-10-31_03-30-38.7437_+0800-e1c54dc8879f97932cbb1520a04210bea6d7aaf4.crash 2024-11-03_07-57-18.8892_+0800-c7704569afc79ce50ac10b66e185de87425b1969.crash 2024-11-03_08-27-19.0514_+0800-c069e2f8dfa6767b8e301513aff3c3a7ea331e2c.crash
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Metal passthrough on intel VMs causes com.apple.screensharing.menuextra to crash and screensharing to exit
https://feedbackassistant.apple.com/feedback/15645457 Metal passthrough on intel VMs causes com.apple.screensharing.menuextra to crash and screensharing to exit Create a 15.1 VM with metal passthrough on 15.0.1 or 15.1 host, enable Screen Sharing, then try connecting to with VNC after restarting the machine. I'm using Anka to create the VM. You'll see VNC work (open vnc://192.168.64.3:5900), then a few seconds in show "Reconnecting...", then work, then go to "Reconnecting..." for ~5m until it eventually works consistently. You'll see launchd showing exits/failures (see screenshots) You'll see diagnostic reports showing things like: Thread 0 Crashed:: Dispatch queue: com.apple.RenderBox.Encoder 0 libsystem_kernel.dylib 0x7ff801da5b52 __pthread_kill + 10 1 libsystem_pthread.dylib 0x7ff801ddff85 pthread_kill + 262 2 libsystem_c.dylib 0x7ff801d00b19 abort + 126 3 libsystem_c.dylib 0x7ff801cffddc __assert_rtn + 314 4 Metal 0x7ff80d045d72 MTLReportFailure.cold.1 + 41 5 Metal 0x7ff80d01fa2a MTLReportFailure + 513 6 Metal 0x7ff80cfb74e0 +[MTLLoader sliceIDForDevice:legacyDriverVersion:airntDriverVersion:] + 200 7 Metal 0x7ff80cf265c9 +[_MTLBinaryArchive(MTLBinaryArchiveInternal) deserializeBinaryArchiveHeader:fileData:device:] + 89 8 Metal 0x7ff80cf10f0c -[_MTLBinaryArchive loadFromURL:error:] + 537 9 Metal 0x7ff80cf10288 -[_MTLBinaryArchive initWithOptions:device:url:error:] + 844 10 RenderBox 0x7ff9041a15fd RB::(anonymous namespace)::load_library_archive(NSBundle*,
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Install eSIM from an Universal Link
I am working on an app on which I want to develop a feature to install eSIMs. I am trying to follow the approach of installing the eSIM with the Universal Link solution by appending the activation code to the link https://esimsetup.apple.com/eSIM_QRCode_Provisioning?carddata=. I was able to successfully call the link and install the eSIM. But after installation, the user stays on the settings app. Is it possible to bring my app back to foreground after installation? Furthermore, is there a way I can listen to the installation result from my app?
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How to mock CBPeripheral data when develop with Core Bluetooth
I'm developing an app which supports for connect with an BLE device. There are some views for showing data from bluetooth. The code below for an example: @EnvironmentObject var bleManager: BLEManager // a class implemented CBCentralManagerDelegate var body: some View { // bleConnected is a CBPeripheral if let bleConnected = bleManager.bleConnected { if let services = bleConnected.services { ForEach(services, id:\.self) { service in // UI for print uuid, descriptions ... showServiceDescriptionView(services) if let characteristics = service.characteristics { ForEach(characteristics, id:\.self) { characteristic in // UI for print uuid, data for each characteristic showCharacteristicsDetailView(characteristic) } } } } } } } But it seems that Xcode Preview do not support connect to a real bluetooth device. So the preview window in Xcode will always be a empty view. I only can see the data on the real device. But it's important for me to design UI on the preview. So are there any method to mock a fake CBPeripheral in the Previewer? Or are there any other way to achieve this?
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macOS API for hardware model name?
If I go to "System Settings" -> "General" -> "About", it says "MacBook Air" and below that "M2, 2022" How can I get these strings programatically? The following C code gets me #include <stdio.h> #include <sys/sysctl.h> int main() { static const unsigned namelen = 2; int name[namelen] = {CTL_HW, HW_PRODUCT}; char buffer[256]; size_t bufferSize = sizeof(buffer); if (0 != sysctl(name, namelen, buffer, &bufferSize, NULL, 0)) { perror("sysctl"); return 1; } printf("%s\n", buffer); } the string "Mac14,2", which is the hardware model identifier. But I want to get the user-friendly model name, e.g. "MacBook Air (13-inch, M2, 2022)". How can I do this?
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MacOS 15 lost the volume label of the USB storage media
Hi. I am having trouble with the issue where the media name and storage information name, which matched in MacOS 14 and earlier, are now inconsistent with the volume label and "NO NAME" in MacOS 15. The problem is that while changing the name on macos 15 will temporarily unify the names, if you overwrite them on Windows they revert to "NO NAME". At first I thought it was reflecting BS_VolLab in the boot sector, but that doesn't seem to be the case. Do you have any ideas for writing a program for Windows to solve this problem?
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