usr/src/cmd/lp/include/msgs.h - illumos-gate - Gitiles

 /*
  * CDDL HEADER START
  *
  * The contents of this file are subject to the terms of the
  * Common Development and Distribution License (the "License").
  * You may not use this file except in compliance with the License.
  *
  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
  * or http://www.opensolaris.org/os/licensing.
  * See the License for the specific language governing permissions
  * and limitations under the License.
  *
  * When distributing Covered Code, include this CDDL HEADER in each
  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  * If applicable, add the following below this CDDL HEADER, with the
  * fields enclosed by brackets "[]" replaced with your own identifying
  * information: Portions Copyright [yyyy] [name of copyright owner]
  *
  * CDDL HEADER END
  */
 /*
  * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
  * Use is subject to license terms.
  */

 /*	Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T	*/
 /*	  All Rights Reserved  	*/


 #pragma ident	"%Z%%M%	%I%	%E% SMI"	/* SVr4.0 1.18	*/

 # include	<sys/types.h>
 # include	<poll.h>
 # include	<stdarg.h>
 # include	<stropts.h>

 #if	!defined(_LP_MSGS_H)
 # define	_LP_MSGS_H

 /*
  * THE DISPATCH TABLE DEPENDS ON EACH R_... MESSAGE FOLLOWING
  * IMMEDIATELY AFTER ITS CORRESPONDING S_... COUNTERPART.
  * I.E R_... MESSAGE FOR A S_... MESSAGE IS (S_... + 1)
  */
 # define	R_BAD_MESSAGE			0
 # define	S_NEW_QUEUE			1
 # define	R_NEW_QUEUE			2
 # define	S_ALLOC_FILES			3
 # define	R_ALLOC_FILES			4
 # define	S_PRINT_REQUEST			5
 # define	R_PRINT_REQUEST			6
 # define	S_START_CHANGE_REQUEST		7
 # define	R_START_CHANGE_REQUEST		8
 # define	S_END_CHANGE_REQUEST		9
 # define	R_END_CHANGE_REQUEST		10
 # define	S_CANCEL_REQUEST		11
 # define	R_CANCEL_REQUEST		12
 # define	S_INQUIRE_REQUEST		13
 # define	R_INQUIRE_REQUEST		14
 # define	S_LOAD_PRINTER			15
 # define	R_LOAD_PRINTER			16
 # define	S_UNLOAD_PRINTER		17
 # define	R_UNLOAD_PRINTER		18
 # define	S_INQUIRE_PRINTER_STATUS	19
 # define	R_INQUIRE_PRINTER_STATUS	20
 # define	S_LOAD_CLASS			21
 # define	R_LOAD_CLASS			22
 # define	S_UNLOAD_CLASS			23
 # define	R_UNLOAD_CLASS			24
 # define	S_INQUIRE_CLASS			25
 # define	R_INQUIRE_CLASS			26
 # define	S_MOUNT				27
 # define	R_MOUNT				28
 # define	S_UNMOUNT			29
 # define	R_UNMOUNT			30
 # define	S_MOVE_REQUEST			31
 # define	R_MOVE_REQUEST			32
 # define	S_MOVE_DEST			33
 # define	R_MOVE_DEST			34
 # define	S_ACCEPT_DEST			35
 # define	R_ACCEPT_DEST			36
 # define	S_REJECT_DEST			37
 # define	R_REJECT_DEST			38
 # define	S_ENABLE_DEST			39
 # define	R_ENABLE_DEST			40
 # define	S_DISABLE_DEST			41
 # define	R_DISABLE_DEST			42
 # define	S_LOAD_FILTER_TABLE		43
 # define	R_LOAD_FILTER_TABLE		44
 # define	S_UNLOAD_FILTER_TABLE		45
 # define	R_UNLOAD_FILTER_TABLE		46
 # define	S_LOAD_PRINTWHEEL		47
 # define	R_LOAD_PRINTWHEEL		48
 # define	S_UNLOAD_PRINTWHEEL		49
 # define	R_UNLOAD_PRINTWHEEL		50
 # define	S_LOAD_USER_FILE		51
 # define	R_LOAD_USER_FILE		52
 # define	S_UNLOAD_USER_FILE		53
 # define	R_UNLOAD_USER_FILE		54
 # define	S_LOAD_FORM			55
 # define	R_LOAD_FORM			56
 # define	S_UNLOAD_FORM			57
 # define	R_UNLOAD_FORM			58
 # define	S_GETSTATUS			59
 # define	R_GETSTATUS			60
 # define	S_QUIET_ALERT			61
 # define	R_QUIET_ALERT			62
 # define	S_SEND_FAULT			63
 # define	R_SEND_FAULT			64
 # define	S_SHUTDOWN			65
 # define	R_SHUTDOWN			66
 # define	S_GOODBYE			67
 # define	S_CHILD_DONE			68

 /*
 **	These are for use by the scheduler only
 */
 # define	I_GET_TYPE			69
 # define	I_QUEUE_CHK			70
 # define	R_CONNECT			71

 # define	S_GET_STATUS			72
 # define	R_GET_STATUS			73
 # define	S_INQUIRE_REQUEST_RANK		74
 # define	R_INQUIRE_REQUEST_RANK		75
 # define	S_CANCEL			76
 # define	R_CANCEL			77
 # define	S_NEW_CHILD			78
 # define	R_NEW_CHILD			79
 # define	S_SEND_JOB			80
 # define	R_SEND_JOB			81
 # define	S_JOB_COMPLETED			82
 # define	R_JOB_COMPLETED			83
 # define	S_INQUIRE_REMOTE_PRINTER	84
 # define	R_INQUIRE_REMOTE_PRINTER	20
 # define	S_CHILD_SYNC			85
 # define	S_LOAD_SYSTEM			86
 # define	R_LOAD_SYSTEM			87
 # define	S_UNLOAD_SYSTEM			88
 # define	R_UNLOAD_SYSTEM			89
 /* new messages */
 # define	S_CLEAR_FAULT			90
 # define	R_CLEAR_FAULT			91
 # define	S_MOUNT_TRAY			92
 # define	R_MOUNT_TRAY			93
 # define	S_UNMOUNT_TRAY			94
 # define	R_UNMOUNT_TRAY			95
 # define	S_MAX_TRAYS			96
 # define	R_MAX_TRAYS			97
 # define	S_PAPER_CHANGED			98
 # define	R_PAPER_CHANGED			99
 # define	S_PAPER_ALLOWED			100
 # define	R_PAPER_ALLOWED			101
 # define	S_PASS_PEER_CONNECTION		102
 # define	R_PASS_PEER_CONNECTION		103
 /*
 **	Last available message
 */
 # define	LAST_MESSAGE			104

 /*
 **      These are the possible status codes returned by the scheduler
 */
 # define	MOK		 0
 # define	MOKMORE		 1
 # define	MOKREMOTE	 2
 # define	MMORERR		 3
 # define	MNODEST		 4
 # define	MERRDEST	 5
 # define	MDENYDEST	 6
 # define	MNOMEDIA	 7
 # define	MDENYMEDIA	 8
 # define	MNOFILTER	 9
 # define	MNOINFO		10
 # define	MNOMEM		11
 # define	MNOMOUNT	12
 # define	MNOOPEN		13
 # define	MNOPERM		14
 # define	MNOSTART	15
 # define	MUNKNOWN	16
 # define	M2LATE		17
 # define	MNOSPACE	18
 # define	MBUSY		19
 # define	MTRANSMITERR	20
 # define	MNOMORE		21
 # define	MGONEREMOTE	22
 # define	MNOTRAY		23

 /*
 ** Offsets and lengths of the various elements of the message header.
 **
 **	Macro		Data Type	Size	Comment
 **
 **	HEAD_RESYNC	2 bytes		(2)	*
 **	HEAD_AUTHCODE	short + long	(6)	*
 **
 **	HEAD_SIZE	4 bytes		(4)	\
 **	HEAD_TYPE	4 bytes		(4)	 > message propper
 **	HEAD_DATA	n bytes		(n)	/
 **
 **	TAIL_CHKSUM	4 bytes		(4)	*
 **	TAIL_ENDSYNC	2 bytes		(2)	*
 **
 **	Items marked with an asterisk are only used with the 3.2
 **	Spooler protocol.
 */

 /*
 **	3.2 Protocol Header Information:
 **		2-byte message introduction
 **		6-byte client authorization data
 */
 #define	HEAD_RESYNC		(0)
 #define HEAD_RESYNC_LEN		2
 #define HEAD_AUTHCODE		(HEAD_RESYNC + HEAD_RESYNC_LEN)
 #define HEAD_AUTHCODE_LEN		(sizeof(short) + sizeof(long))

 /*
 **	3.2 Protocol Message Information:
 **		4-byte message size
 **		4-byte message type
 **		n-byte message data
 */
 #define HEAD_SIZE		(HEAD_AUTHCODE + HEAD_AUTHCODE_LEN)
 #define HEAD_SIZE_LEN			4
 #define HEAD_TYPE		(HEAD_SIZE + HEAD_SIZE_LEN)
 #define HEAD_TYPE_LEN			4
 #define HEAD_DATA		(HEAD_TYPE + HEAD_TYPE_LEN)

 /*
 **	3.2 Protocol Size of non-data header information
 */
 #define HEAD_LEN		HEAD_DATA

 /*
 **	Equivalents for 4.0 protocol
 */
 #define MESG_SIZE		(0)
 #define MESG_SIZE_LEN			4
 #define MESG_TYPE		(MESG_SIZE + MESG_SIZE_LEN)
 #define MESG_TYPE_LEN			4
 #define MESG_DATA		(MESG_TYPE + MESG_TYPE_LEN)

 #define MESG_LEN		MESG_DATA

 /*
 **	3.2 Protocol Trailer Information:
 **		4-byte message check sum
 **		2-byte message closing identifier
 **
 **	"N" is the decoded value of buffer[HEAD_SIZE].  This must
 **	be provided because messages are variable length.
 */
 #define	TAIL_ENDSYNC_LEN		2
 #define	TAIL_ENDSYNC(N)		(N - TAIL_ENDSYNC_LEN)
 #define TAIL_CHKSUM_LEN			4
 #define TAIL_CHKSUM(N)		(TAIL_ENDSYNC(N) - TAIL_CHKSUM_LEN)

 /*
 **	3.2 Protocol Size of non-data trailer information
 */
 #define	TAIL_LEN		(TAIL_CHKSUM_LEN + TAIL_ENDSYNC_LEN)

 /*
 **	3.2 Protocol Size of all non-data information
 **	(This is also the minimum size for 3.2 protocol messages)
 */
 #define	CONTROL_LEN		(HEAD_LEN + TAIL_LEN)

 /*
 **	Size of excess data induced by 3.2 Protocol.
 **	(This is also the size differance between 3.2 & 4.0 protocols)
 */
 #define	EXCESS_3_2_LEN		(HEAD_SIZE + TAIL_LEN)
 /**
  ** Checksum:
  **/
 #define CALC_CHKSUM(B,SZ,RC) \
 if (SZ >= CONTROL_LEN) \
 { \
     register unsigned char	*p = (unsigned char *)B, \
 			    *pend = p + SZ - TAIL_LEN; \
     RC = 0; \
     while (p < pend) \
 	RC += *p++;  /* let it overflow */ \
 } \
 else \
     return ((errno = EINVAL, -1))

 /*
 **      Largest size permitted for any given message
 */
 # define	MSGMAX		2048

 /*
 **      Possible values of the type field of S_QUIET_ALERT
 */
 # define	QA_FORM		1
 # define	QA_PRINTER	2
 # define	QA_PRINTWHEEL	3

 typedef	struct	strbuf	strbuf_t;	/*  STREAMS buffer */

 typedef	struct mque
 {
     struct mque	  *next;
     struct strbuf *dat;
 } MQUE;

 /*
 **	Definition of a message descriptor
 */
 typedef struct
 {
     short	type;			/* type of connection */
     int		readfd;			/* STREAM fd to read from */
     int		writefd;		/* STREAM fd to write to */
     int		wait;			/* number of systems waiting for */
     char	*file;			/* pipe name if type==MD_FIFO */
     short	state;			/* Current state of client */
     short	admin;			/* Non zero if admin  */
     short	event;			/* Event returned from poll */
     MQUE *	mque;			/* backlogged message ptr */
     uid_t	uid;			/* Clients UID */
     gid_t	gid;			/* Clients GID */
     char *	slabel;			/* Clients SLABEL */
     void	(**on_discon)();	/* Clean up functions */
 } MESG;

 # define	MDSIZE	(sizeof(MESG))

 /*
 **	Possible values of MESG.state
 */
 # define	MDS_IDLE	0

 # define	MDS_32PROTO	320
 # define	MDS_32CONNECT	321

 /*
 **	Possible values of MESG.type
 */
 # define	MD_UNKNOWN	0	/* We don't know just yet */
 # define	MD_STREAM	1	/* 4.0 STREAMS pipe protocol */
 # define	MD_BOUND	2	/* 4.0 STREAMS fd protocol */
 # define	MD_SYS_FIFO	3	/* 3.2 named-pipe protocol */
 # define	MD_USR_FIFO	4	/* 3.2 named-pipe protocol */
 # define	MD_MASTER	5	/* MD_STREAM used by lpsched */
 # define	MD_CHILD	6	/* MD_STREAM to a child process */

 /*
 **	Definition for a FIFO buffer (used
 **	in read_fifo.
 */
 typedef struct
 {
 	int	full;
 	char	save [MSGMAX],
 		*psave,
 		*psave_end;
 } fifobuffer_t;

 /*
 **      Definitions for the rest of the world and lint
 */
 /*
 **	Server functions in order of usage
 */
 MESG		* mcreate ( char * );
 int		mlisteninit ( MESG * );
 MESG		* mlisten ( void );
 int		mlistenadd ( MESG *, short );
 int		mon_discon ( MESG *, void (*)());
 MESG		* mlistenreset ( void );
 int		mdestroy ( MESG * );

 /*
 **	Client functions in order of typical usage
 */
 MESG		* mconnect ( char *, int, int );
 int		mgetm ( MESG *, int, ... );
 int		mwrite ( MESG *, char * );
 int		mputm ( MESG *, int, ... );
 int		mread ( MESG *, char *, int );
 short		msize ( char * );
 short		mpeek ( MESG * );
 int		mdisconnect ( MESG * );

 /*
 **	This may be called to deallocate internal buffers allocated
 **	by mgetm and mputm.  Probably not useful except right before
 **	a fork().
 */
 void		__mbfree ( void );

 /*
 **	Client functions for pre-4.0 compatability
 */
 int		mclose ( void );
 int		mneeds ( void );
 int		mopen ( void );
 int		mrecv ( char *, int );
 int		msend ( char * );

 int		Putmsg (MESG *, strbuf_t *, strbuf_t *, int);
 int		Getmsg (MESG *, strbuf_t *, strbuf_t *, int *);
 int		read3_2 (MESG * md, char *msgbuf, int size);
 int		write3_2 (MESG *, char *, int);
 int		read_fifo (int, char *, unsigned int);
 int		write_fifo (int, char *, unsigned int);
 int		ResetFifoBuffer (int);
 fifobuffer_t	*GetFifoBuffer (int);

 /*
 **	General purpose message manipulating functions
 */
 char		* htos ( char *, unsigned short );
 char		* ltos ( char *, unsigned long );
 unsigned long	stol ( char * );
 unsigned short	stoh ( char * );
 int		_getmessage ( char *, short, va_list );
 int		_putmessage ( char *, short, va_list );
 int		getmessage ( char *, short, ... );
 int		putmessage ( char *, short, ... );

 /*
 **	This will yield the type of a message
 */
 # define	mtype(buffer)	(getmessage(buffer, I_GET_TYPE))

 /*
 **	This will yeild the size of a message
 */
 # define	msize(buffer)	(stoh(buffer))

 /*
 **	Pass this for the request-id argument of S_CANCEL
 **	to obtain the effect of the 3.2 S_CANCEL_REQUEST.
 */
 # define	CURRENT_REQ	"current"

 #endif	/* !defined (_LP_MSGS_H) */
	/*
	* CDDL HEADER START
	*
	* The contents of this file are subject to the terms of the
	* Common Development and Distribution License (the "License").
	* You may not use this file except in compliance with the License.
	*
	* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
	* or http://www.opensolaris.org/os/licensing.
	* See the License for the specific language governing permissions
	* and limitations under the License.
	*
	* When distributing Covered Code, include this CDDL HEADER in each
	* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
	* If applicable, add the following below this CDDL HEADER, with the
	* fields enclosed by brackets "[]" replaced with your own identifying
	* information: Portions Copyright [yyyy] [name of copyright owner]
	*
	* CDDL HEADER END
	*/
	/*
	* Copyright 2006 Sun Microsystems, Inc. All rights reserved.
	* Use is subject to license terms.
	*/

	/* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
	/* All Rights Reserved */


	#pragma ident "%Z%%M% %I% %E% SMI" /* SVr4.0 1.18 */

	# include <sys/types.h>
	# include <poll.h>
	# include <stdarg.h>
	# include <stropts.h>

	#if !defined(_LP_MSGS_H)
	# define _LP_MSGS_H

	/*
	* THE DISPATCH TABLE DEPENDS ON EACH R_... MESSAGE FOLLOWING
	* IMMEDIATELY AFTER ITS CORRESPONDING S_... COUNTERPART.
	* I.E R_... MESSAGE FOR A S_... MESSAGE IS (S_... + 1)
	*/
	# define R_BAD_MESSAGE 0
	# define S_NEW_QUEUE 1
	# define R_NEW_QUEUE 2
	# define S_ALLOC_FILES 3
	# define R_ALLOC_FILES 4
	# define S_PRINT_REQUEST 5
	# define R_PRINT_REQUEST 6
	# define S_START_CHANGE_REQUEST 7
	# define R_START_CHANGE_REQUEST 8
	# define S_END_CHANGE_REQUEST 9
	# define R_END_CHANGE_REQUEST 10
	# define S_CANCEL_REQUEST 11
	# define R_CANCEL_REQUEST 12
	# define S_INQUIRE_REQUEST 13
	# define R_INQUIRE_REQUEST 14
	# define S_LOAD_PRINTER 15
	# define R_LOAD_PRINTER 16
	# define S_UNLOAD_PRINTER 17
	# define R_UNLOAD_PRINTER 18
	# define S_INQUIRE_PRINTER_STATUS 19
	# define R_INQUIRE_PRINTER_STATUS 20
	# define S_LOAD_CLASS 21
	# define R_LOAD_CLASS 22
	# define S_UNLOAD_CLASS 23
	# define R_UNLOAD_CLASS 24
	# define S_INQUIRE_CLASS 25
	# define R_INQUIRE_CLASS 26
	# define S_MOUNT 27
	# define R_MOUNT 28
	# define S_UNMOUNT 29
	# define R_UNMOUNT 30
	# define S_MOVE_REQUEST 31
	# define R_MOVE_REQUEST 32
	# define S_MOVE_DEST 33
	# define R_MOVE_DEST 34
	# define S_ACCEPT_DEST 35
	# define R_ACCEPT_DEST 36
	# define S_REJECT_DEST 37
	# define R_REJECT_DEST 38
	# define S_ENABLE_DEST 39
	# define R_ENABLE_DEST 40
	# define S_DISABLE_DEST 41
	# define R_DISABLE_DEST 42
	# define S_LOAD_FILTER_TABLE 43
	# define R_LOAD_FILTER_TABLE 44
	# define S_UNLOAD_FILTER_TABLE 45
	# define R_UNLOAD_FILTER_TABLE 46
	# define S_LOAD_PRINTWHEEL 47
	# define R_LOAD_PRINTWHEEL 48
	# define S_UNLOAD_PRINTWHEEL 49
	# define R_UNLOAD_PRINTWHEEL 50
	# define S_LOAD_USER_FILE 51
	# define R_LOAD_USER_FILE 52
	# define S_UNLOAD_USER_FILE 53
	# define R_UNLOAD_USER_FILE 54
	# define S_LOAD_FORM 55
	# define R_LOAD_FORM 56
	# define S_UNLOAD_FORM 57
	# define R_UNLOAD_FORM 58
	# define S_GETSTATUS 59
	# define R_GETSTATUS 60
	# define S_QUIET_ALERT 61
	# define R_QUIET_ALERT 62
	# define S_SEND_FAULT 63
	# define R_SEND_FAULT 64
	# define S_SHUTDOWN 65
	# define R_SHUTDOWN 66
	# define S_GOODBYE 67
	# define S_CHILD_DONE 68

	/*
	** These are for use by the scheduler only
	*/
	# define I_GET_TYPE 69
	# define I_QUEUE_CHK 70
	# define R_CONNECT 71

	# define S_GET_STATUS 72
	# define R_GET_STATUS 73
	# define S_INQUIRE_REQUEST_RANK 74
	# define R_INQUIRE_REQUEST_RANK 75
	# define S_CANCEL 76
	# define R_CANCEL 77
	# define S_NEW_CHILD 78
	# define R_NEW_CHILD 79
	# define S_SEND_JOB 80
	# define R_SEND_JOB 81
	# define S_JOB_COMPLETED 82
	# define R_JOB_COMPLETED 83
	# define S_INQUIRE_REMOTE_PRINTER 84
	# define R_INQUIRE_REMOTE_PRINTER 20
	# define S_CHILD_SYNC 85
	# define S_LOAD_SYSTEM 86
	# define R_LOAD_SYSTEM 87
	# define S_UNLOAD_SYSTEM 88
	# define R_UNLOAD_SYSTEM 89
	/* new messages */
	# define S_CLEAR_FAULT 90
	# define R_CLEAR_FAULT 91
	# define S_MOUNT_TRAY 92
	# define R_MOUNT_TRAY 93
	# define S_UNMOUNT_TRAY 94
	# define R_UNMOUNT_TRAY 95
	# define S_MAX_TRAYS 96
	# define R_MAX_TRAYS 97
	# define S_PAPER_CHANGED 98
	# define R_PAPER_CHANGED 99
	# define S_PAPER_ALLOWED 100
	# define R_PAPER_ALLOWED 101
	# define S_PASS_PEER_CONNECTION 102
	# define R_PASS_PEER_CONNECTION 103
	/*
	** Last available message
	*/
	# define LAST_MESSAGE 104

	/*
	** These are the possible status codes returned by the scheduler
	*/
	# define MOK 0
	# define MOKMORE 1
	# define MOKREMOTE 2
	# define MMORERR 3
	# define MNODEST 4
	# define MERRDEST 5
	# define MDENYDEST 6
	# define MNOMEDIA 7
	# define MDENYMEDIA 8
	# define MNOFILTER 9
	# define MNOINFO 10
	# define MNOMEM 11
	# define MNOMOUNT 12
	# define MNOOPEN 13
	# define MNOPERM 14
	# define MNOSTART 15
	# define MUNKNOWN 16
	# define M2LATE 17
	# define MNOSPACE 18
	# define MBUSY 19
	# define MTRANSMITERR 20
	# define MNOMORE 21
	# define MGONEREMOTE 22
	# define MNOTRAY 23

	/*
	** Offsets and lengths of the various elements of the message header.
	**
	** Macro Data Type Size Comment
	**
	** HEAD_RESYNC 2 bytes (2) *
	** HEAD_AUTHCODE short + long (6) *
	**
	** HEAD_SIZE 4 bytes (4) \
	** HEAD_TYPE 4 bytes (4) > message propper
	** HEAD_DATA n bytes (n) /
	**
	** TAIL_CHKSUM 4 bytes (4) *
	** TAIL_ENDSYNC 2 bytes (2) *
	**
	** Items marked with an asterisk are only used with the 3.2
	** Spooler protocol.
	*/

	/*
	** 3.2 Protocol Header Information:
	** 2-byte message introduction
	** 6-byte client authorization data
	*/
	#define HEAD_RESYNC (0)
	#define HEAD_RESYNC_LEN 2
	#define HEAD_AUTHCODE (HEAD_RESYNC + HEAD_RESYNC_LEN)
	#define HEAD_AUTHCODE_LEN (sizeof(short) + sizeof(long))

	/*
	** 3.2 Protocol Message Information:
	** 4-byte message size
	** 4-byte message type
	** n-byte message data
	*/
	#define HEAD_SIZE (HEAD_AUTHCODE + HEAD_AUTHCODE_LEN)
	#define HEAD_SIZE_LEN 4
	#define HEAD_TYPE (HEAD_SIZE + HEAD_SIZE_LEN)
	#define HEAD_TYPE_LEN 4
	#define HEAD_DATA (HEAD_TYPE + HEAD_TYPE_LEN)

	/*
	** 3.2 Protocol Size of non-data header information
	*/
	#define HEAD_LEN HEAD_DATA

	/*
	** Equivalents for 4.0 protocol
	*/
	#define MESG_SIZE (0)
	#define MESG_SIZE_LEN 4
	#define MESG_TYPE (MESG_SIZE + MESG_SIZE_LEN)
	#define MESG_TYPE_LEN 4
	#define MESG_DATA (MESG_TYPE + MESG_TYPE_LEN)

	#define MESG_LEN MESG_DATA

	/*
	** 3.2 Protocol Trailer Information:
	** 4-byte message check sum
	** 2-byte message closing identifier
	**
	** "N" is the decoded value of buffer[HEAD_SIZE]. This must
	** be provided because messages are variable length.
	*/
	#define TAIL_ENDSYNC_LEN 2
	#define TAIL_ENDSYNC(N) (N - TAIL_ENDSYNC_LEN)
	#define TAIL_CHKSUM_LEN 4
	#define TAIL_CHKSUM(N) (TAIL_ENDSYNC(N) - TAIL_CHKSUM_LEN)

	/*
	** 3.2 Protocol Size of non-data trailer information
	*/
	#define TAIL_LEN (TAIL_CHKSUM_LEN + TAIL_ENDSYNC_LEN)

	/*
	** 3.2 Protocol Size of all non-data information
	** (This is also the minimum size for 3.2 protocol messages)
	*/
	#define CONTROL_LEN (HEAD_LEN + TAIL_LEN)

	/*
	** Size of excess data induced by 3.2 Protocol.
	** (This is also the size differance between 3.2 & 4.0 protocols)
	*/
	#define EXCESS_3_2_LEN (HEAD_SIZE + TAIL_LEN)
	/**
	** Checksum:
	**/
	#define CALC_CHKSUM(B,SZ,RC) \
	if (SZ >= CONTROL_LEN) \
	{ \
	register unsigned char p = (unsigned char )B, \
	*pend = p + SZ - TAIL_LEN; \
	RC = 0; \
	while (p < pend) \
	RC += p++; / let it overflow */ \
	} \
	else \
	return ((errno = EINVAL, -1))

	/*
	** Largest size permitted for any given message
	*/
	# define MSGMAX 2048

	/*
	** Possible values of the type field of S_QUIET_ALERT
	*/
	# define QA_FORM 1
	# define QA_PRINTER 2
	# define QA_PRINTWHEEL 3

	typedef struct strbuf strbuf_t; /* STREAMS buffer */

	typedef struct mque
	{
	struct mque *next;
	struct strbuf *dat;
	} MQUE;

	/*
	** Definition of a message descriptor
	*/
	typedef struct
	{
	short type; /* type of connection */
	int readfd; /* STREAM fd to read from */
	int writefd; /* STREAM fd to write to */
	int wait; /* number of systems waiting for */
	char file; / pipe name if type==MD_FIFO */
	short state; /* Current state of client */
	short admin; /* Non zero if admin */
	short event; /* Event returned from poll */
	MQUE * mque; /* backlogged message ptr */
	uid_t uid; /* Clients UID */
	gid_t gid; /* Clients GID */
	char * slabel; /* Clients SLABEL */
	void (*on_discon)(); / Clean up functions */
	} MESG;

	# define MDSIZE (sizeof(MESG))

	/*
	** Possible values of MESG.state
	*/
	# define MDS_IDLE 0

	# define MDS_32PROTO 320
	# define MDS_32CONNECT 321

	/*
	** Possible values of MESG.type
	*/
	# define MD_UNKNOWN 0 /* We don't know just yet */
	# define MD_STREAM 1 /* 4.0 STREAMS pipe protocol */
	# define MD_BOUND 2 /* 4.0 STREAMS fd protocol */
	# define MD_SYS_FIFO 3 /* 3.2 named-pipe protocol */
	# define MD_USR_FIFO 4 /* 3.2 named-pipe protocol */
	# define MD_MASTER 5 /* MD_STREAM used by lpsched */
	# define MD_CHILD 6 /* MD_STREAM to a child process */

	/*
	** Definition for a FIFO buffer (used
	** in read_fifo.
	*/
	typedef struct
	{
	int full;
	char save [MSGMAX],
	*psave,
	*psave_end;
	} fifobuffer_t;

	/*
	** Definitions for the rest of the world and lint
	*/
	/*
	** Server functions in order of usage
	*/
	MESG * mcreate ( char * );
	int mlisteninit ( MESG * );
	MESG * mlisten ( void );
	int mlistenadd ( MESG *, short );
	int mon_discon ( MESG , void ()());
	MESG * mlistenreset ( void );
	int mdestroy ( MESG * );

	/*
	** Client functions in order of typical usage
	*/
	MESG * mconnect ( char *, int, int );
	int mgetm ( MESG *, int, ... );
	int mwrite ( MESG , char );
	int mputm ( MESG *, int, ... );
	int mread ( MESG , char , int );
	short msize ( char * );
	short mpeek ( MESG * );
	int mdisconnect ( MESG * );

	/*
	** This may be called to deallocate internal buffers allocated
	** by mgetm and mputm. Probably not useful except right before
	** a fork().
	*/
	void __mbfree ( void );

	/*
	** Client functions for pre-4.0 compatability
	*/
	int mclose ( void );
	int mneeds ( void );
	int mopen ( void );
	int mrecv ( char *, int );
	int msend ( char * );

	int Putmsg (MESG , strbuf_t , strbuf_t *, int);
	int Getmsg (MESG , strbuf_t , strbuf_t , int );
	int read3_2 (MESG * md, char *msgbuf, int size);
	int write3_2 (MESG , char , int);
	int read_fifo (int, char *, unsigned int);
	int write_fifo (int, char *, unsigned int);
	int ResetFifoBuffer (int);
	fifobuffer_t *GetFifoBuffer (int);

	/*
	** General purpose message manipulating functions
	*/
	char * htos ( char *, unsigned short );
	char * ltos ( char *, unsigned long );
	unsigned long stol ( char * );
	unsigned short stoh ( char * );
	int _getmessage ( char *, short, va_list );
	int _putmessage ( char *, short, va_list );
	int getmessage ( char *, short, ... );
	int putmessage ( char *, short, ... );

	/*
	** This will yield the type of a message
	*/
	# define mtype(buffer) (getmessage(buffer, I_GET_TYPE))

	/*
	** This will yeild the size of a message
	*/
	# define msize(buffer) (stoh(buffer))

	/*
	** Pass this for the request-id argument of S_CANCEL
	** to obtain the effect of the 3.2 S_CANCEL_REQUEST.
	*/
	# define CURRENT_REQ "current"

	#endif /* !defined (_LP_MSGS_H) */