static int unix_close(COMSTACK h);
static int unix_put(COMSTACK h, char *buf, int size);
static int unix_get(COMSTACK h, char **buf, int *bufsize);
static int unix_close(COMSTACK h);
static int unix_put(COMSTACK h, char *buf, int size);
static int unix_get(COMSTACK h, char **buf, int *bufsize);