@typedef void (*dvb_logfunc)(int level, const char *fmt, ...) @brief typedef used by dvb_fe_open2 for the log function @ingroup ancillary
@typedef void (*dvb_logfunc)(void *logpriv, int level, const char *fmt, ...) @brief typedef used by dvb_fe_open2 for the log function with private context @ingroup ancillary
@brief This is the prototype of the internal log function that it is used, if the library client doesn't desire to override with something else. @ingroup ancillary
@brief retrieve the logging function with private data from the private fe params.