For errno we are going to use POSIX errno values.
Found this one from open group, which I believe to be the current IEEE std:
http://pubs.opengroup.org/onlinepubs/9699919799/
Will the above reference be OK with everyone as a reference for ERRNO names?
Linux man page seem to suggest it is following that standard.
It appears the standard does not define the value only the name of the errno. I
had not look directly at the standard before :-( Just assuming the applications
must be compiled with the system it will be run. I assume we are not trying to
be binary compatible here.
After tracking down the errno values/defines on my Ubuntu 14.04 system they
really love to hide them now a days.
/usr/include/sys/errno.h —>
/usr/include/errno.h —>
/usr/include/bits/errno.h —>
/usr/include/linux/errno.h —>
/usr/include/asm/errno.h —>
/usr/include/asm-generic/errno.h —>
/usr/include/asm-generic/errno-base.h —>
/usr/include/asm-generic/errno.h
The last two define most of the defines we are interested in for ODP, but a few
of the ones above define a few extras :-(
As long as we use the same define names then we should be OK.
If ODP needs a set of defines not able to be mapped to POSIX then we need to
define a name space to hold these defines similar to what Bill was suggesting
with some type of prefix for all ODP errnos. The platform should do the same,
but this is were the problems begin for the application. The application will
need to include platform specific errno defines when building with a given
platform (ifdef's), so the applications can not be binary compatible across
different platforms.
Does this summarize the errno discussion today and hopefully add some more
definition around how ODP uses errnos?
Here is a link that someone produced by platform, which was a lot of work IMO
:-) and may not be up to date.
http://www.ioplex.com/~miallen/errcmp.html
Thanks
++Keith
Keith Wiles, Principal Technologist with CTO office, Wind River mobile
972-213-5533
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