Re: aio_error query

Hi Michael

Michael Kerrisk wrote, On 07/02/12 18:25:

Hi Jon,

On Sun, Jan 22, 2012 at 10:48 AM, Jon Grant[off-list ref]  wrote:

quoted

Hello

http://www.kernel.org/doc/man-pages/online/pages/man3/aio_error.3.html

Is this really positive?

Do you have some counter-evidence?

aio_return returns an int. POSIX and ISO C specifies errno as an int. 
Neither say that it is a positive number.

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

quoted

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.

Error numbers are all positive. I don't understand your last sentence above.

This may be the case in glibc/linux, but in my experience it is not a 
standard. "errno" is an int:

http://pubs.opengroup.org/onlinepubs/009604599/functions/xsh_chap02_03.html

I work on systems where the EFAULT, EINVAL etc are negative values. So 
it depends if the man page documents linux/glibc specific 
implementation, or the standards.

Do correct me if I have missed something.

Best regards, Jon
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