void sys_error(int severity, const char *msg, ...);
void sys_verror (std::string& strOutput, int severity, const char *msg, va_list arg);
void sys_error_level(int severity);
void sys_error(int severity, const char *msg, ...);
void sys_verror (std::string& strOutput, int severity, const char *msg, va_list arg);
void sys_error_level(int severity);