With the same file it throws on Mac OS X with this exception <div class="snippet-c

Try this commit: <a class="commit-link" data-hovercard-type="commit" data-hovercard-ur

ModuleDefMD.Load works on Windows throws on Mac OS X Yosemite about dnlib HOT 6 CLOSED

0xd4d commented on July 25, 2024

ModuleDefMD.Load works on Windows throws on Mac OS X Yosemite

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Comments (6)

commented on July 25, 2024

errno = 22 = EINVAL so whence (SEEK_END) is invalid according to the doc.

The code works on Linux last time I checked but I don't have a Mac to test it on but they both should support the same API.

Could you test replacing https://github.com/0xd4d/dnlib/blob/master/src/IO/MemoryMappedFileStreamCreator.cs#L119

with

off_t size = new off_t(new FileInfo(creator.theFileName).Length);

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swellfr commented on July 25, 2024

Thanks for your quick response,

After replacing I have this exception:

Unhandled Exception:
System.NullReferenceException: Object reference not set to an instance of an object
  at dnlib.IO.UnmanagedMemoryImageStream.ReadUInt16 () [0x00000] in <filename unknown>:0 
  at dnlib.PE.ImageDosHeader..ctor (IImageStream reader, Boolean verify) [0x00000] in <filename unknown>:0 
  at dnlib.PE.PEInfo..ctor (IImageStream reader, Boolean verify) [0x00000] in <filename unknown>:0 
  at dnlib.PE.PEImage..ctor (IImageStreamCreator imageStreamCreator, ImageLayout imageLayout, Boolean verify) [0x00000] in <filename unknown>:0 
[ERROR] FATAL UNHANDLED EXCEPTION: System.NullReferenceException: Object reference not set to an instance of an object
  at dnlib.IO.UnmanagedMemoryImageStream.ReadUInt16 () [0x00000] in <filename unknown>:0 
  at dnlib.PE.ImageDosHeader..ctor (IImageStream reader, Boolean verify) [0x00000] in <filename unknown>:0 
  at dnlib.PE.PEInfo..ctor (IImageStream reader, Boolean verify) [0x00000] in <filename unknown>:0 
  at dnlib.PE.PEImage..ctor (IImageStreamCreator imageStreamCreator, ImageLayout imageLayout, Boolean verify) [0x00000] in <filename unknown>:0

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commented on July 25, 2024

Seems like mmap on Mac returns 0 on error. Linux returns -1. Since I don't have a Mac, I can't even try to figure out why lseek and mmap doesn't work as expected.

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commented on July 25, 2024

Try this commit: 8775c00

mmap'd IO gets disabled if those funcs fail.

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commented on July 25, 2024

BTW, if you manage to figure out why those funcs fail on MacOSX, let me know (or add a pull request).

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swellfr commented on July 25, 2024

Thanks 0xd4d, dnlib is not throwing anymore.

I will investigate this issue and let you!

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