NSConnection is a Foundation API. You should ask the Cocoa list. -- Damien Sorresso BSD Engineering Apple Inc. On Aug 28, 2009, at 12:21 PM, Steve Gehrman wrote:
I got a launchd tool working using ServiceManagement framework. It runs as root.
The tool is setup to run for a few seconds after the last request and it will keep alive as long as requests are coming in using MachServices.
When idle, the tool exits.
If I try to run the tool a second time, it crashes. I found out the problem was on the application side I was using an NSConnection that connected to the tool that has already died. I didn't get any NSConnectionDied notifications or anything, so there's no way for me to know on the application side when the connection has gone down. If I try to use that connection, I get crashes, and I'm afraid there since this launchd stuff is so crash prone that it won't be reliable.
I'm also sending an object "byRef" using DO from the application to my tool so the tool can talk back to my application. I'm using the same connection I get from connectionWithRegisteredName.
My application does this to connect to the tool:
NSConnection* connection = [NSConnection connectionWithRegisteredName:[self hostServerName] host:nil];
Do I need to invalidate the NSConnection before the tool dies? I think I just delete it.
The crash is 100% repeatable. If I don't reuse the NSConnection on the app side for the next incoming request, it works fine. Should I always tear down the NSConnection and get it fresh for every call I make to my tool?
// the crash
Process: com.cocoatech.pathfinder.SMHelper [36457] Path: /Library/PrivilegedHelperTools/ com.cocoatech.pathfinder.SMHelper Identifier: com.cocoatech.pathfinder.SMHelper Version: ??? (???) Code Type: X86 (Native) Parent Process: launchd [1]
Date/Time: 2009-08-28 00:25:47.754 -0700 OS Version: Mac OS X 10.6 (10A432) Report Version: 6
Exception Type: EXC_BREAKPOINT (SIGTRAP) Exception Codes: 0x0000000000000002, 0x0000000000000000 Crashed Thread: 0 Dispatch queue: com.apple.main-thread
Application Specific Information: *** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: '*** - [NSConcretePortCoder decodeInvocation]: no local target' *** Call stack at first throw: ( 0 CoreFoundation 0x9447b58a __raiseError + 410 1 libobjc.A.dylib 0x94304f49 objc_exception_throw + 56 2 CoreFoundation 0x9447b2b8 +[NSException raise:format:arguments:] + 136 3 CoreFoundation 0x9447b22a +[NSException raise:format:] + 58 4 Foundation 0x9352619f - [NSConcretePortCoder decodeInvocation] + 130 5 Foundation 0x935207ae - [NSConcretePortCoder decodeRetainedObject] + 794 6 Foundation 0x934ff805 _NSWalkData2 + 1098 7 Foundation 0x93525aa9 -[NSConnection handleRequest:sequence:] + 76 8 Foundation 0x9351fdfe -[NSConnection handlePortCoder:] + 951 9 Foundation 0x9351fa2d - [NSConcretePortCoder dispatch] + 160 10 Foundation 0x93507039 __NSFireMachPort + 325 11 CoreFoundation 0x943eadf2 __CFMachPortPerform + 338 12 CoreFoundation 0x943eab8e __CFRunLoopDoSource1 + 366 13 CoreFoundation 0x943e69e9 __CFRunLoopRun + 5561 14 CoreFoundation 0x943e4d34 CFRunLoopRunSpecific + 452 15 CoreFoundation 0x943e4b61 CFRunLoopRunInMode + 97 16 Foundation 0x934df3e4 -[NSRunLoop (NSRunLoop) runMode:beforeDate:] + 279 17 Foundation 0x935343c8 -[NSRunLoop (NSRunLoop) runUntilDate:] + 79 18 com.cocoatech.pathfinder.SMHelper 0x00002bb6 - [NTSMHelperToolConnection(Private) startRunloop] + 198 19 com.cocoatech.pathfinder.SMHelper 0x00002633 + [NTSMHelperToolConnection connect] + 179 20 com.cocoatech.pathfinder.SMHelper 0x00002556 main + 102 21 com.cocoatech.pathfinder.SMHelper 0x000024e5 start + 53 )
Thread 0 Crashed: Dispatch queue: com.apple.main-thread 0 com.apple.CoreFoundation 0x944c5b07 ___TERMINATING_DUE_TO_UNCAUGHT_EXCEPTION___ + 7 1 libobjc.A.dylib 0x94304f49 objc_exception_throw + 56 2 com.apple.CoreFoundation 0x943e4fbc CFRunLoopRunSpecific + 1100 3 com.apple.CoreFoundation 0x943e4b61 CFRunLoopRunInMode + 97 4 com.apple.Foundation 0x934df3e4 -[NSRunLoop(NSRunLoop) runMode:beforeDate:] + 279 5 com.apple.Foundation 0x935343c8 -[NSRunLoop(NSRunLoop) runUntilDate:] + 79 6 ...coatech.pathfinder.SMHelper 0x00002bb6 - [NTSMHelperToolConnection(Private) startRunloop] + 198 7 ...coatech.pathfinder.SMHelper 0x00002633 + [NTSMHelperToolConnection connect] + 179 8 ...coatech.pathfinder.SMHelper 0x00002556 main + 102 (NTSMHelperTool.m:19) 9 ...coatech.pathfinder.SMHelper 0x000024e5 start + 53
Thread 1: Dispatch queue: com.apple.libdispatch-manager 0 libSystem.B.dylib 0x9634b10a kevent + 10 1 libSystem.B.dylib 0x9634b824 _dispatch_mgr_invoke + 215 2 libSystem.B.dylib 0x9634ace1 _dispatch_queue_invoke + 163 3 libSystem.B.dylib 0x9634aa86 _dispatch_worker_thread2 + 234 4 libSystem.B.dylib 0x9634a511 _pthread_wqthread + 390 5 libSystem.B.dylib 0x9634a356 start_wqthread + 30
Thread 2: 0 libSystem.B.dylib 0x9634a1a2 __workq_kernreturn + 10 1 libSystem.B.dylib 0x9634a738 _pthread_wqthread + 941 2 libSystem.B.dylib 0x9634a356 start_wqthread + 30
Thread 0 crashed with X86 Thread State (32-bit): eax: 0x00000000 ebx: 0x94304f25 ecx: 0xa06ef500 edx: 0x0000003b edi: 0xa046eab0 esi: 0x00201a90 ebp: 0xbffffb18 esp: 0xbffffb00 ss: 0x0000001f efl: 0x00000286 eip: 0x944c5b07 cs: 0x00000017 ds: 0x0000001f es: 0x0000001f fs: 0x00000000 gs: 0x00000037 cr2: 0x00032000
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