sysError values...

[Paul Dupuis]

Thank you Trevor!


On 1/30/2019 8:57 AM, Trevor DeVore via use-livecode wrote:
> On Wed, Jan 30, 2019 at 7:11 AM Paul Dupuis via use-livecode <
> use-livecode at lists.runrev.com> wrote:
>
>> But absolutely no mention of where the OSX sysError value comes from.
>> For Linux and Windows you can do a targeted search and find information.
>> It was easy to find
>> https://docs.microsoft.com/en-us/windows/desktop/debug/system-error-codes
>> (even if there is 15999 codes!)
>>
> I think that sysError() on macOS is just returning the OSErr or OSStatus
> codes returned by macOS API calls. I found this document on error handling
> which is informative:
>
> https://developer.apple.com/library/archive/documentation/Cocoa/Conceptual/ErrorHandlingCocoa/ErrorObjectsDomains/ErrorObjectsDomains.html#//apple_ref/doc/uid/TP40001806-CH202-CJBGAIBJ
>
>
> While the document discusses NSError (Cocoa) it does bring up the concept
> of domains. In Listing 1-1 it lists the POSIX domain errors with "13" being
> a "Permission Denied" error. Table 1-1 lists the various domains  with
> information on which header files contain the error codes. I searched the
> non-Cocoa headers on opensource.apple.com and found these urls:
>
> https://opensource.apple.com/source/xnu/xnu-792/osfmk/mach/kern_return.h
> https://opensource.apple.com/source/xnu/xnu-4570.71.2/bsd/sys/errno.h.auto.html
> https://opensource.apple.com/source/CarbonHeaders/CarbonHeaders-18.1/MacErrors.h
>