log like printf c++
void _proxy_log(log_level_t level, const char *fmt, ...)
__attribute__((format (printf, 2, 3)));
#define proxy_log(level, fmt, ...) _proxy_log(level, fmt"\n", ##__VA_ARGS__)
void _proxy_log(log_level_t level, const char *fmt, ...) {
va_list arg;
FILE *log_file = (level == LOG_ERROR) ? err_log : info_log;
/* Check if the message should be logged */
if (level > log_level)
return;
/* Write the error message */
va_start(arg, fmt);
vfprintf(log_file, fmt, arg);
va_end(arg);
#ifdef DEBUG
fflush(log_file);
fsync(fileno(log_file));
#endif
}