On Thu, 2014-12-18 at 15:21 +0100, Luigi Rizzo wrote:
> 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 ?
Normally I'd fix it like:
#define WARN(x,args...) locallog(LOG_WARNING, args)
static inline void
locallog(int lvl, const char *fmt, ...)
logv(level, fmt, ap);
But unfortunately we don't have a logv() function. I think maybe we
should have one. :)
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