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calling an external process
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calling an external process


  • Subject: calling an external process
  • From: Carlos Maldonado <email@hidden>
  • Date: Sat, 24 Oct 2009 17:49:36 -0700

Hi List,

I'm debugging this code where there's a call to an external tool that converts some audio files. This tool is in an obj-c/c mix code and as far as I can tell it leaks memory but this is not the real issue.
The problem is that sometimes this tool crashes with the following output to its own crash report:


***************************************************************************
Process:         theConverter [7329]
Path:            /Users/theT/theConverter
Identifier:      theConverter
Version:         ??? (???)
Code Type:       X86 (Native)
Parent Process:  java [39338]

Date/Time:       2009-10-24 16:35:34.648 -0700
OS Version:      Mac OS X Server 10.5.8 (9L34)
Report Version:  6
Anonymous UUID:  C60F98EE-37EA-4542-AF4E-71677F76441E

Exception Type:  EXC_BAD_ACCESS (SIGBUS)
Exception Codes: KERN_PROTECTION_FAILURE at 0x0000000000000004
Crashed Thread:  0

Thread 0 Crashed:
0 ...ple.ApplicationServices.ATS 0x91ae2307 GetDataChunkPtr(OpaqueStringLookupStruct*) + 15
1 ...ple.ApplicationServices.ATS 0x91ae21c4 FindKeyForPString + 40
2 ...ple.ApplicationServices.ATS 0x91ae20ba _eFOGetFontFamilyFromName + 244
3 ...ple.ApplicationServices.ATS 0x91ae1fac FOGetFontFamilyFromName + 62
4 com.apple.QD 0x97142e75 GetFNum + 17
5 com.apple.HIToolbox 0x921845a6 HLTBGetFontNumber + 24
6 com.apple.HIToolbox 0x921842b8 SetCustomizedFields + 991
7 com.apple.HIToolbox 0x92143809 InitIntlValue + 74
8 ...ple.CoreServices.CarbonCore 0x95372d50 IntlIsInitIntlValueDone + 34
9 ...ple.CoreServices.CarbonCore 0x95387af1 GetCachedItlbValue + 21
10 ...ple.CoreServices.CarbonCore 0x95397b68 GetScriptVariable_FontValue + 444
11 ...ple.CoreServices.CarbonCore 0x953720dd GetScriptVariable + 589
12 ...ple.CoreServices.CarbonCore 0x953977d9 InitLowMemFonts + 65
13 ...ple.CoreServices.CarbonCore 0x95397788 _LMGetSysFontFam + 27
14 ...ple.CoreServices.CarbonCore 0x953976c3 _IntlScript + 50
15 ...ple.CoreServices.CarbonCore 0x9539768e IntlScript + 11
16 com.apple.QuickTime 0x90054dfa PrivateGetMoviePublicMovieComplete_priv + 400
17 com.apple.QuickTime 0x9019a4da NewMovieFromHandlePriv + 467
18 com.apple.QuickTime 0x9019a95d NewMovieFromHandle_priv + 47
19 com.apple.QuickTime 0x9019a921 NewMovieFromHandle + 45
20 ...le.QuickTimeMPEG4.component 0x94fbabca SpitMP4_FromProceduresToDataRef + 6711
21 ...le.QuickTimeMPEG4.component 0x94fb4237 SpitMP4_ComponentDispatch + 123
22 ...ple.CoreServices.CarbonCore 0x95380935 CallComponentDispatch + 29
23 com.apple.QuickTime 0x90299332 MovieExportFromProceduresToDataRef + 49
24 ...le.QuickTimeMPEG4.component 0x94fb871b SpitMP4_ToDataRef + 3066
25 ...ple.CoreServices.CarbonCore 0x95380fcf CallComponentFunctionCommon + 1403
26 ...le.QuickTimeMPEG4.component 0x94fb4237 SpitMP4_ComponentDispatch + 123
27 ...ple.CoreServices.CarbonCore 0x95380935 CallComponentDispatch + 29
28 com.apple.QuickTime 0x9029966f MovieExportToDataRef + 73
29 com.apple.QuickTime 0x901ccd0b ConvertMovieToDataRef_priv + 1727
30 com.apple.QuickTime 0x901cc63e ConvertMovieToDataRef + 71
31 com.apple.QTKit 0x962e7fce -[QTMovie writeToDataReference:withAttributes:error:] + 1592
32 com.apple.QTKit 0x962f257a -[QTMovie writeToFile:withAttributes:error:] + 111
33 com.apple.QTKit 0x962f2505 -[QTMovie writeToFile:withAttributes:] + 56
34 theConverter 0x00005dee -[FlashPlugin processAudioFileWithPath:] + 913
35 theConverter 0x0000583e -[FlashPlugin process] + 679
36 theConverter 0x00005ecf -[BasePlugin loadWithDocument:] + 67
37 theConverter 0x000025f8 main + 686
38 theConverter 0x0000231e start + 54
***************************************************************************
The difficult part has been trying to catch this in a consistent way, as sometimes fails at first attempt and others fails later on, you can't never tell when it's going to fail. This worked on 10.4 before, but it's crashing on 10.5. The worst part is that though my WOApp still runs and can serve requests, theConverter keeps crashing. Is not until I restart my WOApp that theConverter can --with luck-- keep converting files.


I've read technical note TN2083 but it really doesn't say much to me, as I really want to launch the tool by request and not run it as a deamon or agent or anything the like. I'm starting to think in recoding the converter in java but I don't know if this will solve the problem or will behave the same way.
I've modified my woapp to launch theConverter using threads, wating for the process, freeing resources consumed by java due to launching the tool, but still crashes randomly in the same way, so it must be something with the tool or how woapp should handle external faceless tools.


Anybody has have this kind of issue when interacting WOApps with faceless tools?


thanks! -Carlos _______________________________________________ Do not post admin requests to the list. They will be ignored. Webobjects-dev mailing list (email@hidden) Help/Unsubscribe/Update your Subscription: This email sent to email@hidden
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    • Re: calling an external process
      • From: Miguel Arroz <email@hidden>
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