Hi Werner,

On Sun, Mar 31, 2013 at 04:30:26PM -0300, Werner Almesberger wrote:
> Alexander Aring wrote:
> > An another Question is, is the errno available up to userspace? I mean
> > the device need to transfer this errno up to some libnl error handling code
> > which figure out a error string for the specific errno, so lowpan-tools
> > can print it out to stderr.
> 
> iz* uses nl_perror. The path should be as follows:
> 
> - the kernel error code is returned by netlink_ack "as is"
> 
> - libnl/lib/error.c:nl_syserr2nlerr converts errno (E*) error codes
>   to netlink error codes (NLE_*)
> 
> - libnl/lib/error.c:nl_perror then prints the string, according to
>   libnl/lib/error.c:errmsg
> 
> EINVAL becomes NLE_INVAL becomes
> Receive failed: Invalid input data or parameter
> 
> ENOSYS becomes NLE_FAILURE (catchall) becomes
> Receive failed: Unspecific failure
> 
> EOPNOTSUPP becomes NLE_OPNOTSUPP becomes
> Operation not supported
> 
> The list of errors can be seen here:
> https://github.com/tgraf/libnl/blob/master/lib/error.c
> 

ahhh! Wow that's good to know. And I am a little confused that they
don't use perror. Nevertheless I think EOPNOTSUPP is the best for this.

What's your opinion about this?

Alex

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