Re: application error codes

[mrk@aps.anl.gov (Marty Kraimer)]

> 
>   Jim's and my messages crossed. Just fyi, what I am considering proposing
> takes the current "subsys(16:31) | code(0:15)" error code and refines
> "subsys(16:31)" into "severity(28:31) | subsys(16:27)". I was also going
> to propose that the top two bits of severity have the SEVR encoding, which
> neatly means that MAJOR and INVALID give negative error codes (Jeff warned
> us off negative error codes but I would think that it would be easy to
> avoid "-errno"-type codes?).

Should allow for errno codes. Note that existing system does this. A subsystem
number of 0 means Unix (Posix.1) error codes.

Marty