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launch due to a background fetch event does not work when debug in iOS17. it work correctly in iOS16, even though debug with xcode15.0.1

i does not implementation background push notification in my app. however i found my app launch in background(applicationState is equal to background inapplicationDidFinishLaunch method) and launchOptions contained UIApplicationLaunchOptionsRemoteNotificationKey. the value of UIApplicationLaunchOptionsRemoteNotificationKey does not contained content-available : 1 is it a bug or sepcial case ?

there are some crash in my app. WatchdogVisibility: Foreground WatchdogCPUStatistics: ( "Elapsed total CPU time (seconds): 3.670 (user 2.300, system 1.370), 3% CPU", "Elapsed application CPU time (seconds): 0.404, 0% CPU" ) reportType:CrashLog maxTerminationResistance:Interactive>} Thread 0 Crashed: 0 681B06A0-7F6B-3FA3-A2CE-063DC1DA7B1B0x27e00 __ulock_wait 1 5D16936B-4E4C-3276-BA7A-69C9BC760ABA0xa0ff4 _dlock_wait 2 5D16936B-4E4C-3276-BA7A-69C9BC760ABA0xa0f24 _dispatch_once_wait 3 BFBF140A-DB1B-3B5B-ACE4-1C990763332A0x6e7c8 +[AVAudioSession sharedInstance] And i found another [AVAudioSession sharedInstance] symbol in other thread ProcessVisibility: Foreground ProcessState: Running WatchdogEvent: scene-create WatchdogVisibility: Foreground WatchdogCPUStatistics: ( "Elapsed total CPU time (seconds): 3.670 (user 2.300, system 1.370), 3% CPU", "Elapsed application CPU time (seconds): 0.404, 0% CPU" ) reportType:CrashLog maxTerminationResistance:Interactive>} 0 681B06A0-7F6B-3FA3-A2CE-063DC1DA7B1B0x272c8 mach_msg2_trap 1 681B06A0-7F6B-3FA3-A2CE-063DC1DA7B1B0x3a194 mach_msg2_internal 2 681B06A0-7F6B-3FA3-A2CE-063DC1DA7B1B0x3a46c mach_msg_overwrite 3 681B06A0-7F6B-3FA3-A2CE-063DC1DA7B1B0x27808 mach_msg 4 5D16936B-4E4C-3276-BA7A-69C9BC760ABA0xbb964 _dispatch_mach_send_and_wait_for_reply 5 5D16936B-4E4C-3276-BA7A-69C9BC760ABA0xbbcf4 dispatch_mach_send_with_result_and_wait_for_reply 6 A0D322A3-D772-3260-9690-71F28737C43C0x8ea8c xpc_connection_send_message_with_reply_sync 7 1715DE5D-0893-3AF0-B0C0-550BB14F91EC0x4dc3b4 __NSXPCCONNECTION_IS_WAITING_FOR_A_SYNCHRONOUS_REPLY__ 8 1715DE5D-0893-3AF0-B0C0-550BB14F91EC0x46f760 -[NSXPCConnection _sendInvocation:orArguments:count:methodSignature:selector:withProxy:] 9 A900B459-0127-379E-9CBA-0EAB9C5D559F0x1214a0 ___forwarding___ 10 A900B459-0127-379E-9CBA-0EAB9C5D559F0x187ef8 __forwarding_prep_0___ 11 BFBF140A-DB1B-3B5B-ACE4-1C990763332A0x7d700 -[AVAudioSession privateCreateSessionInServerUsingXPC] 12 BFBF140A-DB1B-3B5B-ACE4-1C990763332A0x7e874 -[AVAudioSession initWithSpecification:] 13 BFBF140A-DB1B-3B5B-ACE4-1C990763332A0x6e1b8 -[AVAudioSession initWithSessionType:] 14 BFBF140A-DB1B-3B5B-ACE4-1C990763332A0x6e158 __32+[AVAudioSession sharedInstance]_block_invoke 15 5D16936B-4E4C-3276-BA7A-69C9BC760ABA0xa0604 _dispatch_client_callout 16 5D16936B-4E4C-3276-BA7A-69C9BC760ABA0xa1e44 _dispatch_once_callout 17 BFBF140A-DB1B-3B5B-ACE4-1C990763332A0x6e7c8 +[AVAudioSession sharedInstance] why deadlock happend to [AVAudioSession sharedInstance]? i try get volume of [AVAudioSession sharedInstance] in my didFinishLaunchingWithOptions

recently, i receive some feebacks There are two domain names in my app, the first domain name always reports error -1003(NRURLErrorCannotFindHost) ,at the same time the sencond domain does not report any error. what is the problem? how to resolve this problem? in documention, -1003 means host name can not be resolved. but the second domain has no error at the same thime

In my app, I want to resolve an address with a DNS server address of my choice (the DNS isn't mine, I just want to resolve domain of my app with other dns server). i have try this code. #include <dns.h> #include <dns_sd.h> #include <sys/socket.h> static NSData * synchronousDNSQuery() { NSData * result; NSURL * confURL; dns_handle_t dns; uint8_t responseBuffer[4096]; struct sockaddr_storage fromAddr; uint32_t fromAddrLen; int32_t queryResult; confURL = [[NSBundle mainBundle] URLForResource:@"resolv" withExtension:@"conf"]; dns = dns_open(confURL.fileSystemRepresentation); fromAddrLen = sizeof(fromAddr); queryResult = dns_query( dns, "example.com.", kDNSServiceClass_IN, kDNSServiceType_A, (char *) responseBuffer, sizeof(responseBuffer), (struct sockaddr *) &fromAddr, &fromAddrLen ); if (queryResult > 0) { result = [NSData dataWithBytes:responseBuffer length:(NSUInteger) queryResult]; NSLog(@"response %@ from %@", result, [NSData dataWithBytes:&fromAddr length:(NSUInteger) fromAddrLen] ); } else { result = nil; NSLog(@"error"); } dns_free(dns); return result; } However, this code can not compile success . here is the error message Undefined symbols for architecture x86_64 _dns_free _dns_open _dns_query how to resolve this compiler error? or Is there any other way to customize dns service?