Hi Jon, On Sun, Feb 19, 2012 at 2:06 AM, Jon Grant <jg@xxxxxxxx> wrote: > Hi Michael > > Michael Kerrisk wrote, On 07/02/12 18:25: > >> Hi Jon, >> >> On Sun, Jan 22, 2012 at 10:48 AM, Jon Grant<jg@xxxxxxxx> wrote: >>> >>> 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. Okay. > http://pubs.opengroup.org/onlinepubs/009604599/functions/xsh_chap02_03.html > http://www.cl.cam.ac.uk/cgi-bin/manpage?3+errno > >>> 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? >> 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. 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. Thanks, Michael -- Michael Kerrisk Linux man-pages maintainer; http://www.kernel.org/doc/man-pages/ Author of "The Linux Programming Interface"; http://man7.org/tlpi/ -- To unsubscribe from this list: send the line "unsubscribe linux-man" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
