Bug 19991 - Calling Syscall.GetLastError() throws ArgumentOutOfRange for 93
Summary: Calling Syscall.GetLastError() throws ArgumentOutOfRange for 93
Alias: None
Product: MonoMac
Classification: Desktop
Component: Bindings ()
Version: unspecified
Hardware: Macintosh Mac OS
: --- normal
Target Milestone: ---
Assignee: Bugzilla
Depends on:
Reported: 2014-05-22 08:32 UTC by Till Lorentzen
Modified: 2014-05-23 13:45 UTC (History)
2 users (show)

Is this bug a regression?: ---
Last known good build:

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Description Till Lorentzen 2014-05-22 08:32:12 UTC
The following code produces a System.ArgumentOutOfRangeException:
"Current platform doesn't support this value.
Parameter name: value


byte[] value;
Mono.Unix.Native.Syscall.getxattr(System.IO.Directory.GetCurrentDirectory(), "test", out value);

MacOS Version 10.9.3

But it works on Linux.

Version PublicKeyToken=0738eb9f132ed756
Comment 1 Jonathan Pryor 2014-05-23 12:23:13 UTC
The Errno enum values are based on the Linux values. On Linux, ENOATTR is an alias for ENODATA, and thus the Errno enum doesn't contain an entry for ENOATTR.

On OS X, ENOATTR is NOT an alias for ENODATA, and in this case getxattr() is setting errno to 93, which is ENOATTR. Since there's no mapping for ENOATTR, the exception is thrown.

Reviewing the OS X errno.h, I find that there are 20 error values which aren't yet bound in the Errno enum.

The fix is both simple and complicated: we need to add the missing constants to the Errno enum. The complication comes in adding the values without complicating the addition of future Linux error values; I see that Errno is also missing 7 new values from Linux as well.
Comment 2 Jonathan Pryor 2014-05-23 13:45:40 UTC
Fixed in mono/d2b52794.