|  | 
 | // | 
 | union ip2breadcrumb  | 
 | { | 
 | 	struct {  | 
 | 		unsigned char port, cat, codes, label; | 
 | 	} __attribute__ ((packed)) hdr; | 
 | 	unsigned long value; | 
 | }; | 
 |  | 
 | #define ITRC_NO_PORT 	0xFF | 
 | #define CHANN	(pCh->port_index) | 
 |  | 
 | #define	ITRC_ERROR	'!' | 
 | #define	ITRC_INIT 	'A' | 
 | #define	ITRC_OPEN	'B' | 
 | #define	ITRC_CLOSE	'C' | 
 | #define	ITRC_DRAIN	'D' | 
 | #define	ITRC_IOCTL	'E' | 
 | #define	ITRC_FLUSH	'F' | 
 | #define	ITRC_STATUS	'G' | 
 | #define	ITRC_HANGUP	'H' | 
 | #define	ITRC_INTR 	'I' | 
 | #define	ITRC_SFLOW	'J' | 
 | #define	ITRC_SBCMD	'K' | 
 | #define	ITRC_SICMD	'L' | 
 | #define	ITRC_MODEM	'M' | 
 | #define	ITRC_INPUT	'N' | 
 | #define	ITRC_OUTPUT	'O' | 
 | #define	ITRC_PUTC	'P' | 
 | #define	ITRC_QUEUE	'Q' | 
 | #define	ITRC_STFLW	'R' | 
 | #define	ITRC_SFIFO	'S' | 
 | #define	ITRC_VERIFY	'V' | 
 | #define	ITRC_WRITE	'W' | 
 |  | 
 | #define	ITRC_ENTER	0x00 | 
 | #define	ITRC_RETURN	0xFF | 
 |  | 
 | #define	ITRC_QUEUE_ROOM	2 | 
 | #define	ITRC_QUEUE_CMD	6 | 
 |  |