__plogp
#define __plog(p, l, fmt, ...) __plogp(p, (p)->prefix, l, fmt, ## __VA_ARGS__)
__plogp((&(fc)->log), prefix, 'i', fmt, ## __VA_ARGS__)
__plogp((&(fc)->log), prefix, 'w', fmt, ## __VA_ARGS__)
__plogp((&(fc)->log), prefix, 'e', fmt, ## __VA_ARGS__)