1#ifndef _ARPA_TFTP_H
 2#define _ARPA_TFTP_H
 3#define SEGSIZE 512
 4#define RRQ 01
 5#define WRQ 02
 6#define DATA 03
 7#define ACK 04
 8#define ERROR 05
 9struct tftphdr {
10	short th_opcode;
11	union {
12		unsigned short tu_block;
13		short tu_code;
14		char tu_stuff[1];
15	} th_u;
16	char th_data[1];
17};
18#define th_block th_u.tu_block
19#define th_code th_u.tu_code
20#define th_stuff th_u.tu_stuff
21#define th_msg th_data
22#define EUNDEF 0
23#define ENOTFOUND 1
24#define EACCESS 2
25#define ENOSPACE 3
26#define EBADOP 4
27#define EBADID 5
28#define EEXISTS 6
29#define ENOUSER 7
30#endif
31