On Thu, 2014-12-18 at 15:21 +0100, Luigi Rizzo wrote:
> Hi,
> in the porting of some kernel code to FreeBSD, i need to remap one
> function with a variable number of arguments to the log() function
> from the freebsd kernel.
> Normally i would do
>       #define WARN(x, args...)        log(LOG_WARNING, args)
> but this does not work in my case because the function is called in
> (many) blocks where there is already a local variable with the same name
>       bool log;
> which is used a ton of times.
> I was wondering if there is some C compiler magic i can use to do the
> remapping without going through a macro; I haven't found any direct one,
> though perhaps something like
>       extern void (*freebsd_log)(int level, const char *fmt, ...);
>       #define WARN(x, args...)    freebsd_log(LOG_WARNING, args)
> followed somewhere in a safe place by
>               freebsd_log = log;
> may do the job.
> Any other option ?
>       cheers
>       luigi

Normally I'd fix it like:

 #define WARN(x,args...) locallog(LOG_WARNING, args)

 static inline void
 locallog(int lvl, const char *fmt, ...)
        va_list ap;

        va_start(ap, fmt);
        logv(level, fmt, ap);

But unfortunately we don't have a logv() function.  I think maybe we
should have one.  :)

-- Ian

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