Re: aio_error query

Hi Jon

On Sun, Feb 19, 2012 at 9:37 AM, Jon Grant [off-list ref] wrote:

Hi Michael

Michael Kerrisk wrote, On 18/02/12 18:18:
[...]

quoted

quoted

http://pubs.opengroup.org/onlinepubs/009604599/functions/xsh_chap02_03.html
http://www.cl.cam.ac.uk/cgi-bin/manpage?3+errno

quoted

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errno is an int, and the values I think are not
guaranteed to be positive (like with glibc). I work on a system where
they
are all negative.

What is the system?

http://www.mpcdata.com/mediasdk/

Is this actually a UNIX system?

[..]

quoted

What you say is now clearer to me, and sounds reasonable. Still, I'm
curious about this other system you are using; I think on every system
I encountered, error numbers are positive.

Perhaps errno macros as positive numbers are a de facto convention.

It appears to be so, but AFAICS you're correct about POSIX not
mandating it. I'll check into this some more.

Cheers,

Michael


-- 
Michael Kerrisk
Linux man-pages maintainer; http://www.kernel.org/doc/man-pages/
Author of "The Linux Programming Interface"; http://man7.org/tlpi/
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