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Editorial Team
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Asked: 2026-05-27T20:52:48+00:00

I wrote a method to submit an error-report via HTTP POST. I run OSX-Lion

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I wrote a method to submit an error-report via HTTP POST. I run OSX-Lion and MonoDevelop. The code works when the application is called from MonoDevelop. When I run the .app it throws an exception:

System.TypeInitializationException: An exception was thrown by the type initializer for System.Net.WebRequest ---> System.DllNotFoundException: libc.dylib
  at (wrapper managed-to-native) System.Platform:uname (intptr)
  at System.Platform.get_IsMacOS () [0x00000] in <filename unknown>:0 
  at System.Net.WebRequest..cctor () [0x00000] in <filename unknown>:0 
  --- End of inner exception stack trace ---
  at ch.fangorn.LIF.Access.SubmitCrash.Submit (Int32 projectId) [0x00000] in <filename unknown>:0

At the moment I call the Submit method directly not via a catch. Since it works when a debugger is attached I’m stranded. What I so far tried:

  1. Build a mono application bundle (Create mac installer)
  2. Build everything with Platform target x86
  3. The beta version of Mono and MonoDevelop

The code that IMO causes the crash.

HttpWebRequest hwr = WebRequest.Create(turi) as HttpWebRequest;
string authInfo = user + ":" + password;
authInfo = Convert.ToBase64String(Encoding.Default.GetBytes(authInfo));
hwr.Headers["Authorization"] = "Basic " + authInfo;

hwr.Method = "POST";
hwr.ContentType = "text/xml";
hwr.ContentLength = encData.Length;

Stream send = hwr.GetRequestStream();
send.Write(encData, 0, encData.Length);
send.Close();
hwr.GetResponse();

MonoDevelop: 2.8.5
Mono: 2.10.8

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1 Answer

  1. Editorial Team

    Symptom: System libraries not found (System.DllNotFoundException: libc.dylib)
    when a mono created .app is started outside of MonoDevelop.

    In the wrapper-script created by mono develop: MyApp.app/Contents/MacOS/MyApp
    DYLD_FALLBACK_LIBRARY_PATH is set without including default. Since an empty
    DYLD_FALLBACK_LIBRARY_PATH means the default this will remove default. System
    libraries cannot be found.

    In my opition the line should be:

    export DYLD_FALLBACK_LIBRARY_PATH="$MONO_FRAMEWORK_PATH/lib:$DYLD_FALLBACK_LIBRARY_PATH:$(HOME)/lib:/usr/local/lib:/lib:/usr/lib"

    Or a check if DYLD_FALLBACK_LIBRARY_PATH is empty would be even better.

    I filed a bug-report: http://bugzilla.xamarin.com/show_bug.cgi?id=2727

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