extern int vppcom_session_read (uint32_t session_handle, void *buf, size_t n);
extern int vppcom_session_write (uint32_t session_handle, void *buf,
size_t n);
extern int vppcom_session_write_msg (uint32_t session_handle, void *buf,
size_t n);
extern int vppcom_session_read (uint32_t session_handle, void *buf, size_t n);
extern int vppcom_session_write (uint32_t session_handle, void *buf,
size_t n);
extern int vppcom_session_write_msg (uint32_t session_handle, void *buf,
size_t n);