char *(*f_addrstr)(COMSTACK handle);
void *(*f_straddr)(COMSTACK handle, const char *str);
int (*f_set_blocking)(COMSTACK handle, int blocking);
char *(*f_addrstr)(COMSTACK handle);
void *(*f_straddr)(COMSTACK handle, const char *str);
int (*f_set_blocking)(COMSTACK handle, int blocking);