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Power 6/32 Unix version 1.2b

/*	tftp.h	4.2	83/06/11	*/

/*
 * Trivial File Transfer Protocol (IEN-133)
 */
#define	SEGSIZE		512		/* data segment size */

/*
 * Packet types.
 */
#define	RRQ	01			/* read request */
#define	WRQ	02			/* write request */
#define	DATA	03			/* data packet */
#define	ACK	04			/* acknowledgement */
#define	ERROR	05			/* error code */


#if defined(vax)
struct	tftphdr {
	short	th_opcode;		/* packet type */
	union {
		short	tu_block;	/* block # */
		short	tu_code;	/* error code */
		char	tu_stuff[1];	/* request packet stuff */
	} th_u;
	char	th_data[1];		/* data or error string */
};

#define	th_block	th_u.tu_block
#define	th_code		th_u.tu_code
#define	th_stuff	th_u.tu_stuff
#define	th_msg		th_data
#endif

#if defined(tahoe)
struct 	tftphdr {
	union {
		short	opcode;			/* packet type */
		struct {
			short	dummy;
			short	block;		/* block #  OR error code */
		}u1;
		struct {
			short	dummy;
			char	stuff[1];	/* request packet stuff */
		}u2;
	}u;
	char	th_data[1];			/* data or error string */
};
#define th_opcode	u.opcode
#define	th_block	u.u1.block
#define	th_code		u.u1.block
#define	th_stuff	u.u2.stuff
#define	th_msg		th_data
#endif

/*
 * Error codes.
 */
#define	EUNDEF		0		/* not defined */
#define	ENOTFOUND	1		/* file not found */
#define	EACCESS		2		/* access violation */
#define	ENOSPACE	3		/* disk full or allocation exceeded */
#define	EBADOP		4		/* illegal TFTP operation */
#define	EBADID		5		/* unknown transfer ID */
#define	EEXISTS		6		/* file already exists */
#define	ENOUSER		7		/* no such user */

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