#include <yaz/comstack.h>
    #include <yaz/tcpip.h>  /* this is for TCP/IP and SSL support */
    #include <yaz/unix.h>   /* this is for UNIX socket support */
    COMSTACK cs_create(CS_TYPE type, int blocking, int protocol);
    COMSTACK cs_createbysocket(int s, CS_TYPE type, int blocking,
                               int protocol);
    COMSTACK cs_create_host(const char *str, int blocking,
                            void **vp);
    int cs_bind(COMSTACK handle, int mode);
    int cs_connect(COMSTACK handle, void *address);
    int cs_rcvconnect(COMSTACK handle);
    int cs_listen(COMSTACK handle);
    COMSTACK cs_accept(COMSTACK handle);
    int cs_put(COMSTACK handle, char *buf, int len);
    int cs_get(COMSTACK handle, char **buf, int *size);
    int cs_more(COMSTACK handle);
    void cs_close(COMSTACK handle);
    int cs_look(COMSTACK handle);
    void *cs_straddr(COMSTACK handle, const char *str);
    const char *cs_addrstr(COMSTACK h);