Re: [Xen-devel] [PATCH] libxen-3.0 (libxc rewrite)

[Anthony Liguori <aliguori@xxxxxxxxxx>]

Christian Limpach wrote:

> > You're right.  Some of the interfaces are a little awkward (especially 
> > the memory mapping ones).  It seemed like a reasonable trade-off to make 
> > though.
> >    
> What about perror, warn, err and the likes, I really like to use those.
> It seems very illogical having to stick the returned value into errno to be
> able to use those...
>  
You're not going to like this answer but I don't think I would use any 
of those functions in a real management application.  Management tools 
should be using standard logging suites (like syslog).
strerror() still works with these return codes btw.  My test code 
usually likes like this:
domid_t domid;
int ret = dom_create_domain(3000, 0, &domid);

if (ret < 0) error("dom_create_domain: failed %s", strerror(-ret));

This would be even easier if the library returned errno instead of 
-errno ;-)
Regards,
Anthony Liguori


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