text: /* @(#)rpc_msg.h	2.1 88/07/29 4.0 RPCSRC */
  /*
   * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
   * unrestricted use provided that this legend is included on all tape
   * media and as a part of the software program in whole or part.  Users
   * may copy or modify Sun RPC without charge, but are not authorized
   * to license or distribute it to anyone else except as part of a product or
   * program developed by the user.
   * 
   * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
   * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
   * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
   * 
   * Sun RPC is provided with no support and without any obligation on the
   * part of Sun Microsystems, Inc. to assist in its use, correction,
   * modification or enhancement.
   * 
   * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
   * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
   * OR ANY PART THEREOF.
   * 
   * In no event will Sun Microsystems, Inc. be liable for any lost revenue
   * or profits or other special, indirect and consequential damages, even if
   * Sun has been advised of the possibility of such damages.
   * 
   * Sun Microsystems, Inc.
   * 2550 Garcia Avenue
   * Mountain View, California  94043
   */
  /*      @(#)rpc_msg.h 1.7 86/07/16 SMI      */
  
  /*
   * rpc_msg.h
   * rpc message definition
   *
   * Copyright (C) 1984, Sun Microsystems, Inc.
   */
  
  #define RPC_MSG_VERSION		((u_long) 2)
  #define RPC_SERVICE_PORT	((u_short) 2048)
  
  /*
   * Bottom up definition of an rpc message.
   * NOTE: call and reply use the same overall stuct but
   * different parts of unions within it.
   */
  
  enum msg_type {
  	CALL=0,
  	REPLY=1
  };
  
  enum reply_stat {
  	MSG_ACCEPTED=0,
  	MSG_DENIED=1
  };
  
  enum accept_stat {
  	SUCCESS=0,
  	PROG_UNAVAIL=1,
  	PROG_MISMATCH=2,
  	PROC_UNAVAIL=3,
  	GARBAGE_ARGS=4,
  	SYSTEM_ERR=5
  };
  
  enum reject_stat {
  	RPC_MISMATCH=0,
  	AUTH_ERROR=1
  };
  
  /*
   * Reply part of an rpc exchange
   */
  
  /*
   * Reply to an rpc request that was accepted by the server.
   * Note: there could be an error even though the request was
   * accepted.
   */
  struct accepted_reply {
  	struct opaque_auth	ar_verf;
  	enum accept_stat	ar_stat;
  	union {
  		struct {
  			u_long	low;
  			u_long	high;
  		} AR_versions;
  		struct {
  			caddr_t	where;
  			xdrproc_t proc;
  		} AR_results;
  		/* and many other null cases */
  	} ru;
  #define	ar_results	ru.AR_results
  #define	ar_vers		ru.AR_versions
  };
  
  /*
   * Reply to an rpc request that was rejected by the server.
   */
  struct rejected_reply {
  	enum reject_stat rj_stat;
  	union {
  		struct {
  			u_long low;
  			u_long high;
  		} RJ_versions;
  		enum auth_stat RJ_why;  /* why authentication did not work */
  	} ru;
  #define	rj_vers	ru.RJ_versions
  #define	rj_why	ru.RJ_why
  };
  
  /*
   * Body of a reply to an rpc request.
   */
  struct reply_body {
  	enum reply_stat rp_stat;
  	union {
  		struct accepted_reply RP_ar;
  		struct rejected_reply RP_dr;
  	} ru;
  #define	rp_acpt	ru.RP_ar
  #define	rp_rjct	ru.RP_dr
  };
  
  /*
   * Body of an rpc request call.
   */
  struct call_body {
  	u_long cb_rpcvers;	/* must be equal to two */
  	u_long cb_prog;
  	u_long cb_vers;
  	u_long cb_proc;
  	struct opaque_auth cb_cred;
  	struct opaque_auth cb_verf; /* protocol specific - provided by client */
  };
  
  /*
   * The rpc message
   */
  struct rpc_msg {
  	u_long			rm_xid;
  	enum msg_type		rm_direction;
  	union {
  		struct call_body RM_cmb;
  		struct reply_body RM_rmb;
  	} ru;
  #define	rm_call		ru.RM_cmb
  #define	rm_reply	ru.RM_rmb
  };
  #define	acpted_rply	ru.RM_rmb.ru.RP_ar
  #define	rjcted_rply	ru.RM_rmb.ru.RP_dr
  
  
  /*
   * XDR routine to handle a rpc message.
   * xdr_callmsg(xdrs, cmsg)
   * 	XDR *xdrs;
   * 	struct rpc_msg *cmsg;
   */
  extern bool_t	xdr_callmsg();
  
  /*
   * XDR routine to pre-serialize the static part of a rpc message.
   * xdr_callhdr(xdrs, cmsg)
   * 	XDR *xdrs;
   * 	struct rpc_msg *cmsg;
   */
  extern bool_t	xdr_callhdr();
  
  /*
   * XDR routine to handle a rpc reply.
   * xdr_replymsg(xdrs, rmsg)
   * 	XDR *xdrs;
   * 	struct rpc_msg *rmsg;
   */
  extern bool_t	xdr_replymsg();
  
  /*
   * Fills in the error part of a reply message.
   * _seterr_reply(msg, error)
   * 	struct rpc_msg *msg;
   * 	struct rpc_err *error;
   */
  extern void	_seterr_reply();
  