text: /*!\file arpa/tftp.h
   * TFTP definitions.
   */
  
  /*
   * Copyright (c) 1983, 1993
   *      The Regents of the University of California.  All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in the
   *    documentation and/or other materials provided with the distribution.
   * 3. All advertising materials mentioning features or use of this software
   *    must display the following acknowledgement:
   *      This product includes software developed by the University of
   *      California, Berkeley and its contributors.
   * 4. Neither the name of the University nor the names of its contributors
   *    may be used to endorse or promote products derived from this software
   *    without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   * SUCH DAMAGE.
   *
   *      @(#)tftp.h      8.1 (Berkeley) 6/2/93
   * $FreeBSD: /repoman/r/ncvs/src/include/arpa/tftp.h,v 1.3.6.1 2002/08/14 21:59:26 peter Exp $
   */
  
  #ifndef __ARPA_TFTP_H
  #define __ARPA_TFTP_H
  
  /*
   * 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 */
  #undef  ERROR                           /* In <wingdi.h> */
  #define ERROR   05                      /* error code */
  #define OACK    06                      /* option acknowledgement */
  
  W32_CLANG_PACK_WARN_OFF()
  
  #include <sys/pack_on.h>
  
  struct tftphdr {
         unsigned short   th_opcode;      /* packet type */
         union {
           unsigned short tu_block;       /* block # */
           unsigned short tu_code;        /* error code */
           char           tu_stuff[1];    /* request packet stuff */
         } th_u;
         char             th_data[1];     /* data or error string */
       };
  
  #include <sys/pack_off.h>
  
  W32_CLANG_PACK_WARN_DEF()
  
  #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
  
  /*
   * 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 */
  #define EOPTNEG         8               /* option negotiation failed */
  
  #endif
  