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Trailing-Edge - PDP-10 Archives - BB-J713A-BM - language-sources/glxipc.mac
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TITLE GLXIPC  --  IPCF INTERFACE FOR GALAXY PROGRAMS
SUBTTL Cliff Romash & Irwin L. Goverman/CER/PJT/DC/MLB  11-JUN-79

;
;
;                COPYRIGHT (c) 1975,1976,1977,1978,1979
;                    DIGITAL EQUIPMENT CORPORATION
;
;     THIS SOFTWARE IS FURNISHED UNDER A LICENSE AND MAY  BE  USED
;     AND COPIED ONLY IN ACCORDANCE WITH THE TERMS OF SUCH LICENSE
;     AND WITH THE INCLUSION OF THE ABOVE COPYRIGHT NOTICE.   THIS
;     SOFTWARE  OR ANY OTHER COPIES THEREOF MAY NOT BE PROVIDED OR
;     OTHERWISE MADE AVAILABLE TO ANY OTHER PERSON.  NO  TITLE  TO
;     AND OWNERSHIP OF THE SOFTWARE IS HEREBY TRANSFERRED.
;
;     THE INFORMATION  IN  THIS  SOFTWARE  IS  SUBJECT  TO  CHANGE
;     WITHOUT  NOTICE  AND SHOULD NOT BE CONSTRUED AS A COMMITMENT
;     BY DIGITAL EQUIPMENT CORPORATION.
;
;     DIGITAL ASSUMES NO RESPONSIBILITY FOR THE USE OR RELIABILITY
;     OF  ITS  SOFTWARE  ON  EQUIPMENT  WHICH  IS  NOT SUPPLIED BY
;     DIGITAL.

	SEARCH	GLXMAC			;SEARCH SUBSYSTEMS SYMBOLS
	PROLOG(GLXIPC,IPC)		;PRODUCE PROLOG CODE

;THE PURPOSE OF THIS MODULE IS TO PROVIDE AN OPERATING SYSTEM INDEPENDENT
;	IPCF INTERFACE TO GALAXY PROGRAMS (OR ANY OTHER PROGRAM WHICH
;	WANTS TO USE IT).

;ALL SUBROUTINES IN THIS MODULE USE ACS S1 AND S2 (1 AND 2) AND GUARANTEE
;	THAT ALL OTHER ACS WILL BE PRESERVED.


	IPCEDT==43			;VERSION NUMBER
SUBTTL Table of contents

;               TABLE OF CONTENTS FOR GLXIPC
;
;
;                        SECTION                                   PAGE
;    1. Table of contents.........................................   2
;    2. Revision History..........................................   3
;    3. Entry Points found in GLXIPC..............................   4
;    4. Global Storage............................................   5
;    5. C%INIT - Initialize the IPCF interface....................   6
;    6. C%CPID - Create a PID.....................................   6
;    7. CHKNAM - See if PIB has a name attached...................  10
;    8. CHKAND - Check PIB to see if account and node pointers specified  10
;    9. C%KPID, C%SPID............................................  11
;   10. C%SEND Routine to send an IPCF Message....................  12
;   11. SNDMSG - Work routine to do actual IPCF send..............  14
;   12. C%INTR - Interrupt level routine to flag message available  16
;   13. C%RECV - Non-blocking IPCF receive........................  16
;   14. C%BRCV - Blocking IPCF Receive............................  16
;   15. RCVMSG - Work routine to do an actual IPCF receive........  17
;   16. C%REL  - Release the last message received................  20
;   17. C%RPRM  Routine to read IPCF Parameters...................  20
;   18. GETPID - Acquire a PID for this job.......................  21
;   19. KILPID  Routine to delete a pid...........................  22
;   20. SPID   - Set a system PID.................................  23
;   21. RSPIDS  Routine to read System Pid tables.................  24
;   22. RSPID Routine to return a system pid......................  25
;   23. C%MAXP  - Read maximum short packet size..................  27
;   24. CPIDI  - Connect PID to specified interrupt channel.......  28
;   25. IPRM Read/Write IPCF parameters...........................  29
;   26. MNPRED/MNPWRT - Read/Write maximum number of PIDS.........  30
;   27. QTARED/QTAWRT - Read/Write the Send and Receive Quotas....  31
;   28. SETNAM - Routine to declare our name to INFO..............  32
;   29. SNDSYS - Routine to converse with [SYSTEM]INFO & IPCC.....  33
;   30. STAC   - Routine to build INFO messages...................  35
;   31. C%PIDJ  Returb PID owners job number......................  36
SUBTTL Revision History

COMMENT \

Edit	  GCO	Reason
----    ------- -------------------------------------------------------
0001		Initial version of GLXIPC
0002		Make sending to PID 0 illegal
0003		Convert to new OTS format
0004		Add better send failure recovery code
		  Also, receive packets .GT. short packet size if they come
0005	G012	Change the definition of the 'capabilties' word in the MDB
		to contain a canonical set of capabilities rather than the
		operating-system specific capabilities.  It also contains
		the senders job number.
0006	G016	On the -10, don't try to determine the length of the System
		PID table before doing the GETTABs.  Just do SZ.PID GETTABs.

0007		Change the debugging system so that 'alternates' are used
		only if DEBUGW is set.
0010	G025	Change the DEBUGW so that  a non-zero value enables
		the DEBUGGING System while a negative value will
		declare a private component to SYSTEM[INFO].
		Also fix C%RECV so that MD%PWH is only turned on with
		JACCT on the -10.
0011	G026	FIX RSEFLG ACTION TO RETURN ON ERRORS AND LOOP THE
		PROPER NUMBER OF TIMES IF NOT SET
0012	G027	MAKE C%RECV USE THE ASSOCIATED VARIABLE NAD DO PAGE 
		CHECK FIRST
0013	G052	Fix C%RECV to Destroy non-existent page if failed on 
		page mode due to wrong mode
0014		Remove DEBUGW test to set quotas and job wide pid
		Also -- convert some$STOP messages to $FATAL and
		some $TEXT to $WARN
0015		Made extensive changes to Debugging code and initializtion
		code.  Added error code ERICA$ to use in range checks.
		Modified RSPIDS to do alternate search based on DEBUGW
		and a special name table.  
		Modified C%SEND to clear the internal pid table entry
		if a send to a system pid fails.
0016		Fixed TOPS20 code in KILPID and SNDSYS to work properly
0017		Fixed SNDSYS to save SNDFLG
0020		Cosmetic cleanup.  Changed ERICA$ to ERARG$ for
		errors which are caused by bad calling args.
		Corrected spelling.
		Added "PULSAR" name for SP.TLP
0021		Use SPIDS macro to make up SPDNAM
0022		Change C%INIT to setup debugging names based on SPIDS,
		Not on contents of the IB
		The degugging flag DEBUGW (135) now has 2, not 3 meanings
		0== off, -1 == on.  If it is ON, and the IB says to become
		a system PID, then C%INIT uses the name in the SPIDS table
		to declare [p,pn]NAME to system info
0023		Install PIB and multiple PID support
0024		Print Becomming PID message only if Debugging. Make getting
		of maximum packet size a Library entry Point (C%MAXP)
0025		Make getting maximum packet size a part of C%INIT
		even if no PIB is specified in IB
0026		Preserve RCVMDB+MDB.MS durring SNDSYS so C%REL will
		always work after sending to a system component in
		in DEBUG mode
0027		Make C%PIDJ entry to return Pid's job number
0030		Make C%KPID work for -10.  Kill named PIDs via INFO only,
		and unnamed PIDs via IPCC, then INFO if that fails.
0031		Fix setting of Maximum number of Pids to first
		Read the number then increment and write it out
0032		Change SAVE to $SAVE
0033		Fix Maximum PID setting Bug
0034		Make MAXPAK a global variable
0035		Return ARG if sending a 0 length message
0036		Return ARG if attempting to SNDMSG with a 0 PID
0037		TOPS10 - Set job # as PID when conversing with
		INFO or IPCC to get a PID.
0040		Write system PID table after setting MYPID
0041		Fix a bug in wait logic if debugging and the component
		does not yet exist.
0042		-10, Set Job number as PID
0043		CHANGE THE SEND QUOTA SETTINGS TO READ THE CURRENT
		SETTING AND THEN ADD TO IT
		while asking INFO for PIDs of debugging
		system components
\  ;END OF REVISION HISTORY
SUBTTL Entry Points found in GLXIPC

	ENTRY	C%INIT			;INITIALIZE THE MODULE
	ENTRY	C%CPID			;CREATE A PID
	ENTRY	C%SPID			;SET DEFAULT SENDER PID
	ENTRY	C%KPID			;KILL A PID
	ENTRY	C%RPRM			;READ IPCF PARAMETERS
	ENTRY	C%INTR			;POST AND IPCF INTERRUPT
	ENTRY	C%SEND			;SEND AN IPCF MESSAGE
	ENTRY	C%RECV			;NON-BLOCKING IPCF RECEIVE
	ENTRY	C%BRCV			;BLOCKING IPCF RECEIVE
	ENTRY	C%REL			;RELEASE LAST IPCF MESSAGE
	ENTRY	C%MAXP			;MAX PACKET SIZE ENTRY POINT
	ENTRY	C%PIDJ			;RETURN PID OWNERS JOB NUMBER
SUBTTL Global Storage

	EXT	IIB			;USE GLOBAL IB
	EXT	MYJOB			;JOB NUMBER FROM GLXINT
	$GDATA	MYPID			;PROCESS IDENTIFIER
	$DATA	DEFPID			;Default (ie first) PID
	$DATA	FSTPFG			;Set after we define first PID
	$GDATA	IMOPR			;Set if we are ORION
	
	$DATA	PSIFLG			;FLAG SET IF IPCF IS CONNECT TO PSI SYSTEM
	$DATA	SNDFLG			;FLAGS TO USE FOR SEND
	$DATA	RCVFLG			;FLAGS TO USE FOR RECIEVE
	$DATA	RCVPAG			;PAGSIZ,,PAGADR RESERVED FOR RECV
	$DATA	MSGFLG			;SET AT INTERRUPT LEVEL (IF PSI USED)
	$GDATA	RSEFLG			;RETURN SEND ERROR FLAG
	$GDATA	MAXPAK			;LARGEST SIZE OF A SHORT MESSAGE


	$DATA	IPCINT			;INTERRUPT ADDRESS FOR IPCF STATUS
	$DATA	IPCSTS			;IPCF STATUS..ASSOCIATED VARIABLE
	$DATA	PIDTAB,SZ.PID		;TABLE OF SYSTEM PIDS
	$DATA	ALTNAM,SZ.PID		;Table of alternate names for system
					;components.  Debuggers can poke
					;a slot to -1 to force a debugging library
					;to talk to that system component.
					;Or, the address of an ASCIZ string can
					;be poked in to force a debugging
					;library to talk to that named component
					;instead of the standard library
					;debugging conventions.

	$DATA	STACP			;BYTE POINTER FOR NAME CREATION

	$DATA	MTLBLK,3		;MUTIL BLOCK

	SYSPRM	(IPCSLN,4,.IPCFP+1)	;Length of a send block
	SYSPRM	(IPCRLN,.IPCFC+1,.IPCLL+1) ;Length of a receive block
	$DATA	SNDBLK,IPCSLN		;IPCF SEND PACKET DESCRIPTOR BLOCK
	$DATA	RCVBLK,IPCRLN		;IPCF RECEIVE PDB

	$DATA	SNDSAB,SAB.SZ		;PLACE TO BUILD A SAB INTO
	$DATA	RCVMDB,MDB.SZ		;PLACE TO BUILD MDB INTO
	$DATA	ACTPTR			;POINTER TO USER AREA FOR ACCT STRING
	$DATA	NODPTR			;POINTER TO USER AREA FOR NODE STRING
	$DATA	PACKET,SZ.PAK		;PLACE TO RECEIVE SHORT MESSAGE INTO
TOPS10 <
	$DATA	OPRPPN			;PPN OF THE OPERATOR
>  ;END TOPS10 CONDITIONAL

;SPDNAM TABLE TO SETUP SEARCH FOR SPECIAL SYSTEM PIDS BY NAME

DEFINE .SPID(CANNAM,T10IDX,T20IDX,SYMNAM),<
IFNB <SYMNAM>,<
	$SET	(CANNAM,,<SIXBIT/SYMNAM/>)
>;;END IFNB SYMNAM
>;End DEFINE .SPID

SPDNAM:	$BUILD	(SZ.PID)
	SPIDS				;Generate the Special names
	$EOB


; INDIRECT TEXT STRING TO USE FOR BUILDING INFO NAME

TOPS10 <
NAMTXT:	ITEXT(<^U/[-1]/^W/S1/>) 	;OUR NAME+CUSP+NULL 
>
TOPS20 <
NAMTXT:	ITEXT(<[^U/[-1]/]^W/S1/>)
> ;END TOPS20 CONDITIONAL



	DEFINE	$SLEEP(TIME),<
	XLIST
	TOPS10 <MOVEI S1,TIME		;;GET THE TIME TO SLEEP IN SECONDS
		SLEEP S1,		;;GO TO SLEEP
	>
	TOPS20 <MOVEI S1,TIME*^D1000	;;GET THE TIME TO SLEEP IN MILLISECONDS
		DISMS			;;GO TO SLEEP
	>
	LIST>
SUBTTL	C%INIT - Initialize the IPCF interface

; Initializes IPCF interface, acquires PID and does alternate search.

;CALL IS:	IIB setup by I%INI1 in GLXINT
	
;TRUE RETURN:	Always, PID stored in the IIB

C%INIT:	SETZM	FSTPFG			;Clear first PID flag
	SETZM	IMOPR			;Say that I'm not ORION
	SETZM	MYPID			;We don't have a PID
	SETZM	ACTPTR			;Clear out the acct string ptr
	SETZM	NODPTR			;And clear out nod pointer, too
	SETOM	ALTNAM+SP.INF		;Always use real system info
	PUSHJ	P,C%MAXP			;READ MAXIMUM PACKET SIZE
	CAXLE	S1,SZ.PAK		;IS IT TOO LARGE?
	$WARN <Packet size (^D/[SZ.PAK]/) too small.  MAXPAK (^D/S1/).>
	CAXLE	S1,SZ.PAK		;PACKET SIZE OK?
	MOVX	S1,SZ.PAK		;NO -- GET OUR MAXIMUM
	MOVEM	S1,MAXPAK		;STORE FOR C%SEND
TOPS10<
	SETOM	ALTNAM+SP.IPC		;Always use real IPCC, too
>;End TOPS10 conditional
	SKIPN	S2,IIB+IB.PIB		;Does the caller want to use IPCF?
	$RETT				;No, nothing to do here!
	LOAD	S1,PB.HDR(S2),PB.LEN	;Yes, get length of block in S1
	PUSHJ	P,C%CPID		;Get the PID
	JUMPT	.RETT			;OK
	$STOP	(CGP,Can't Get a PID)

SUBTTL	C%CPID - Create a PID
;This routine will create a PID, give it a name, connect it to
; the interrupt system, set its quotas, etc, etc, based on the PIB passed.
;Arguments:
;	S1-Length of block
;	S2-Addr of PIB
;Returns:
;	True, all set
;	False,	ERARG$
C%CPID:	CAIL	S1,PB.MNS		;Small PIB?
	CAILE	S1,PB.MXS		;.. or big PIB
	$RETE	(ARG)			;No good
	$SAVE	<P1,P2>			;Save some work regs
	DMOVE	P1,S1			;Copy the input args
	SKIPE	FSTPFG			;Has our data base been intialized?
	JRST	CPID.1			;Yes, charge on!
	SETOM	MSGFLG			;SET MESSAGE AVAILABLE FLAG
	SETZM	SNDFLG			;INIT SEND FLAGS
	MOVX	S1,IP.TTL		;GET TRUNCATE LONG MESSAGE FLAG
	MOVEM	S1,RCVFLG		;INIT RECIEVE FLAGS
	PUSHJ	P,RSPIDS		;READ THE SYSTEM PIDS
TOPS10 <
	MOVX	S1,%LDFFA		;WE NEED OPR PPN FOR PRIV CHECK
	GETTAB	S1,			;SO GET IT
	  MOVX	S1,<1,,2>		;USE A SUITABLE DEFAULT
	MOVEM	S1,OPRPPN		;SAVE IT
>  ;END TOPS10 CONDITIONAL

;C%INIT	CONTINUED ON NEXT PAGE
;C%INIT CONTINUED FROM PREVIOUS PAGE
CPID.1:	LOAD	S2,PB.INT(P2),IP.SPI	;GET REQUESTED INDEX
	JUMPE	S2,CPID.3		;JUMP IF WE ARE NOT SYSTEM TO JUST GET A PID
	CAXN	S2,SP.OPR		;Becoming ORION?
	SETOM	IMOPR			;Set flag for .STOP
	SKIPN	S1,PIDTAB(S2)		;IS THERE A PID THERE?
	JRST	CPID.2			;NAME NOT THERE -- MUST GET A PID
	MOVEM	S1,PB.PID(P2)		;Save as ours
	PUSHJ	P,C%PIDJ		;GET PID'S JOB NUMBER
	JUMPF	CPID.2			;NO OWNER -- MUST GET A PID
	CAME	S1,MYJOB		;IS IT MINE?
	 $FATAL (Requested Pid belongs to JOB ^D/S1/) ;NOPE
	JRST	CPID.7			;NO NEED TO GET A PID
					;We already own that PID

CPID.2:	SKIPN	DEBUGW			;Are we debugging?
	JRST	CPID.4			;No, never bother INFO in production
	PUSHJ	P,CHKNAM		;Set up the name pointer
	JUMPT	CPID.5			;All set, caller has special debug name
					;Otherwise, set up library convention
	LOAD	S2,PB.INT(P2),IP.SPI	;Get back special index
	SKIPN	S1,SPDNAM(S2)		;Get debugging name from table
	$FATAL	(No debugging name for special index ^O/S2/)	;None there
	MOVEI	S2,NAMTXT		;Aim at ITEXT to convert debug name
	JRST	CPID.5			;Go setup the name, get the PID

;Here if we're not becoming a system PID
CPID.3:	PUSHJ	P,CHKNAM		;Set up name pointers
	JUMPT	CPID.5			;All set, use callers name
					;otherwise, use noname
CPID.4:	SETZ	S2,			;Indicate no name desired
CPID.5:	PUSHJ	P,SETNAM		;Set name in message to IPCC or IPCF
	LOAD	S1,PB.FLG(P2),IP.JWP	;Get desired job-wide flag
	PUSHJ	P,GETPID		;GET A PID FOR MY JOB
	MOVEM	S1,PB.PID(P2)		;SAVE ACQUIRED PID
;C%INIT	CONTINUED ON NEXT PAGE
;C%INIT CONTINUED FROM PREVIOUS PAGE

;Here when the PID and requisite name have been set up.
CPID.7:	LOAD	S2,PB.PID(P2)		;Get back pid
	SKIPE	FSTPFG			;First time 'round?
	JRST	CPID.8			;No, the defaults were set last time
	MOVEM	S2,DEFPID		;Save as default for -1 to C%SPID
	MOVEM	S2,MYPID		;That's mine!
	SETOM	FSTPFG			;Note that we've been here
CPID.8:	LOAD	S1,PB.INT(P2),IP.SPI	;GET SPECIAL INDEX FIELD
	SKIPE	S1			;WANT TO BE SYSTEM PID?
	PUSHJ	P,SPID			;YES -- GO SET IT
	SETO	S1,			;SET TO WRITE IPCF PARAMETERS
	SKIPE	S2,PB.SYS(P2)		;GET IPCF PARAMETER WORD
	PUSHJ	P,IPRM			;MAKE CHANGES
	LOAD	S1,PB.FLG(P2),IP.RSE	;WANT SEND FAILURES RETURNED?
	MOVNM	S1,RSEFLG		;SET OR CLEAR THE FLAG
	LOAD	S1,PB.FLG(P2),IP.SPB	;GET SENDER'S PRIV FLAG
	SKIPN	DEBUGW			;DEBUGGING?
	STORE	S1,RCVFLG,IP.CFP	;NO -- STORE IN RECIEVE FLAGS
	LOAD	S1,PB.INT(P2),IP.CHN	;GET CHANNEL OR OFFSET FOR PSI
	LOAD	S2,PB.FLG(P2),IP.PSI	;SEE WHETHER PSI IS TO BE USED
	MOVNM	S2,PSIFLG		;SET OR CLEAR THE FLAG
	LOAD	S2,PB.PID(P2)		;Get desired PID
	SKIPE	PSIFLG			;IS IPCF CONNECTION WANTED?
	PUSHJ	P,CPIDI			;YES, CONNECT PID TO INTERRUPT SYSTEM
	PUSHJ	P,CHKAND		;Check out account and node pointers
	$RETT				;All done
SUBTTL	CHKNAM - See if PIB has a name attached
;Call - P1/ length of PIB
;	P2/ addr of PIB
;Returns - FALSE if PIB is too short or no name pointer in PIB
;	TRUE - S1 has pointer, S2 has ITEXT to it (suitable for SETNAM)

CHKNAM:	CAILE	P1,PB.NAM		;Was a name supplied?
	SKIPN	S1,PB.NAM(P2)		;Was one?
	$RETF				;No, Tell caller there's none

	TLCE	S1,-1			;0 left half
	TLCN	S1,-1			; or -1 left half?
	HRLI	S1,(POINT 7,)		;Yes, make a pointer
	MOVEI	S2,[ITEXT (<^Q/S1/>)]	;Aim at the pointer just built
	$RETT				;Return S1,S2 setup

SUBTTL	CHKAND - Check PIB to see if account and node pointers specified
;Call -	P1/ length of PIB
;	P2/ addr of PIB
;Returns - TRUE (always)

CHKAND:	CAIG	P1,PB.ACT		;Is there an act ptr on the block?
	$RETT				;No, quit
	SKIPE	S1,PB.ACT(P2)		;Get ptr, if any
	MOVEM	S1,ACTPTR		;Save it if there is one
	CAIG	P1,PB.LOC		;Is there a logical location pointer
	$RETT				;No
	SKIPE	S1,PB.LOC(P2)		;Maybe, get it
	MOVEM	S1,NODPTR		;Yes there is, save it
	$RETT				;All done
SUBTTL	C%KPID, C%SPID
;C%KPID - Kill a PID
;	Call - S1/addr of  PIB describing PID to be killed
;	Return, TRUE - PID has been killed, and removed from system tables
;			(if appilicable)
;		FALSE - PID wasn't killed,perhaps because
;			insufficient privs, or no such PID
C%KPID:	$SAVE	<P1>			;Save work reg
	MOVE	P1,S1			;Copy input arg
	SKIPN	S1,PB.PID(P1)		;Get PID, if any
	$RETT				;None there, all done!
TOPS10<
	LOAD	S2,PB.INT(P1),IP.SPI	;Get special PID index
	SKIPE	S2			;If special index
	SKIPN	DEBUGW			; ... and we're debugging,
	SKIPA				;(Not special, or not debug) skipa
	JRST	KPID.N			; ... must be named, kill via INFO
	$SAVE	<P2>			;Preserve another AC
	PUSH	P,S1			;Save PID to be killed
	MOVE	P2,P1			;Setup addr of PIB
	LOAD	P1,PB.HDR(P2),PB.LEN	;Get length of the PIB
	PUSHJ	P,CHKNAM		;See if this PIB is named
	JUMPF	[POP	P,S1		;No name, Get back PID
		JRST	KPID.U]		;And kill it either way
	POP	P,S1			;There is a name, must kill via INFO
KPID.N:	PUSHJ	P,KILPDN		;Kill via INFO
	SKIPA				;Reenter common flow
KPID.U:>;End TOPS10
	PUSHJ	P,KILPID		;Give it the gong
	JUMPF	.RETF			;Couldn't do it
	MOVE	S2,PB.PID(P1)		;Get back PID just killed
	MOVSI	S1,-SZ.PID		;Get AOBJN ptr for PIDTAB
KPID.1:	CAMN	S2,PIDTAB(S1)		;Does this one match?
	SETZM	PIDTAB(S1)		;Yes, kill it
	AOBJN	S1,KPID.1		;Check all the pids in our table
	$RETT				;Back to caller

;C%SPID - A routine to set the default send PID
;Call  S1/addr of PIB describing new default or -1 to set original default
;Return - TRUE always
C%SPID:	SKIPGE	S1			;Skip if a PIB is there, otherwise...
	SKIPA	S2,DEFPID		;Get original default PID
	SKIPE	S2,PB.PID(S1)		;Get PID to be set
	MOVEM	S2,MYPID		;Set as our sender default
	$RETT
SUBTTL	C%SEND Routine to send an IPCF Message

;CALL	S1/ Length of SAB
;	S2/ Address of SAB

;TRUE Return if message is sent Successfully

;FALSE Return if message cannot be sent for any reason

;POSSIBLE ERRORS

;	ERARG$		Invalid Calling Argument
;	ERNSP$		No Such Pid
;	ERRQF$		Recievers Quota Full
;	ERSQF$		Senders Quota Full
;	ERSLE$		System Limits Exceeded
;	ERUSE$		Unexpected System Error

C%SEND:	CAXGE	S1,SAB.SZ		;PROPER SAB?
	 $RETE(ARG)			;NO -- RETURN ERROR
	PUSHJ	P,.SAVE2		;PRESERVE P1-P2
	LOAD	P1,SAB.LN(S2)		;P1 IS MESSAGE LENGTH
	MOVE	P2,S2			;P2 IS SAB ADDRESS
	CAIL	P1,1			;MESSAGE LENGTH OK?
	CAILE	P1,PAGSIZ
	 $RETE(ARG)			;NO -- RETURN ERROR
	LOAD	S2,SAB.MS(P2)		;GET MESSAGE ADDRESS
	CAMG	P1,MAXPAK		;LARGR THAN A PACKET?
	JRST	SEND.4			;NO -- SEND A PACKET
	CAIN	P1,PAGSIZ		;EXACTLY ONE PAGE?
	JRST	SEND.2			;YES -- GO SEND IT
SEND.1:	$CALL	M%GPAG			;NO -- CREATE A PAGE AND COPY MESSAGE
	HRL	S1,SAB.MS(P2)		;FORM BLT POINTER
	HRRZ	S2,S1			;GET NEW PAGE ADDRESS
	ADDI	S2,0(P1)		;ADDRESS + MESSAGE SIZE
	BLT	S1,-1(S2)		;MOVE ENTIRE MESSAGE TO NEW PAGE
	SUBI	S2,0(P1)		;RECLAIM NEW MESSAGE ADDRESS
;HERE TO SEND A PAGE

SEND.2:	TRNE	S2,PAGSIZ-1		;IS PAGE ON PAGE BOUNDRY?
	 $RETE(ARG)			;NO -- RETURN ERROR
	ADR2PG	S2			;YES -- CONVERT TO PAGE NUMBER
	HRLI	S2,PAGSIZ		;SEND A FULL PAGE
	MOVX	S1,IP.CFV		;GET THE PAGE MODE FLAG
	IORM	S1,SNDFLG		;AND SET IT
	MOVE	S1,P2			;POINT TO SAB
	MOVEI	P2,(S2)			;REMEMBER THE PAGE NUMBER
	PUSHJ	P,SNDMSG		;GO SEND THE MESSAGE
	$SAVE	<TF,S1>			;SAVE FOR FINAL RETURN
	MOVE	S1,P2			;RECLAIM PAGE NUMBER
	JUMPF	SEND.3			;ANY ERRORS?
	$CALL	M%IPSN			;NO -- MARK SENT BY IPC
	SKIPA	S1,P2			;RECLAIM NUMBER AND RELEASE
SEND.3:	CAIE	P1,PAGSIZ		;IS THIS MY CREATED PAGE?
	$CALL	M%RELP			;YES -- RELEASE IT
	$RET				;RETURN TF AND S1 FROM SNDMSG

;HERE TO SEND A PACKET

SEND.4:	HRL	S2,P1			;FORM LENGTH,,ADDRESS
	MOVX	S1,IP.CFV		;GET PAGE MODE FLAG
	ANDCAM	S1,SNDFLG		;AND CLEAR IT
	MOVE	S1,P2			;POINT TO SAB
	PJRST	SNDMSG			;FALL INTO COMMON CODE AND RETURN
SUBTTL SNDMSG - Work routine to do actual IPCF send

;CALL		S1/ SAB Address
;		S2/ Message Length,,Message Address

SNDMSG:	$SAVE	<P1,P2,P3,P4>
	DMOVE	P1,S1			;PRESERVE CALLING ARGS
	SKIPN	P3,RSEFLG		;RETURN SEND ERRORS?
	MOVX	P3,RT.SFL		;NO -- LOAD RETRY LIMIT
	SETO	P4,			;SYSTEM INDEX OR -1 IF SEND BY PID
	MOVE	S1,MYPID		;GET MY PID
	SKIPE	S2,SAB.PB(P1)		;Want to send for a different PID?
	MOVE	S1,PB.PID(S2)		;Yes, get PID from PIB attached to SAB
	SKIPN	S1			;Is there really a PID?
	$RETE	(ARG)			;No, complain
	MOVEM	S1,SNDBLK+.IPCFS	;I AM SENDER
	LOAD	S1,SAB.PD(P1)		;GET RECIEVERS PID
	LOAD	S2,SAB.SI(P1),SI.FLG	;GET SPECIAL INDEX FLAG
	JUMPE	S2,SNDM.2		;SEND BY PID?
	LOAD	S1,SAB.SI(P1),SI.IDX	;NO -- SEND BY INDEX
	MOVE	P4,S1			;REMEMBER WHO IT IS
	SKIPN	P3,RSEFLG		;RETURN SEND ERRORS?
	MOVX	P3,RT.SCL		;NO -- GET SYSTEM RETRY LIMIT
SNDM.1:	PUSHJ	P,RSPID			;GET THE RECIEVERS PID
	JUMPF	[CAIE S1,ERNSP$		;UNKNOWN PID FOR SYSTEM COMPONENT?
		 $RET			;NO -- RETURN THE ERROR
		 CAXN P3,RT.SCL		;YES -- FIRST RETRY?
		 SKIPN SPDNAM(P4)	;YES -- DOES PID HAVE A NAME?
		  CAIA			;NO -- DON'T PRINT THE MSG
		 SKIPN DEBUGW		;YES -- DEBUGGING?
		  CAIA			;NO -- DON'T PRINT THE MESSAGE
		 $WARN (Waiting for ^W/SPDNAM(P4)/ to start)
		 SOJL P3,.POPJ		;RETURN ERROR IF RETRY LIMIT EXAUSTED
		 $SLEEP RT.SLP		;SLEEP FOR A WHILE
		 MOVE S1,P4		;RETORE DESIRED INDEX
		 JRST SNDM.1]		;AND TRY AGAIN
SNDM.2:	MOVEM	S1,SNDBLK+.IPCFR	;SAVE RECIEVERS PID
	MOVEM	P2,SNDBLK+.IPCFP	;SAVE PAGE/PACKET POINTER
	MOVE	S2,SNDFLG		;GET SEND FLAGS
TOPS10 <
	CAMN	S1,PIDTAB+SP.IPC	;SENDING TO IPCC?
	IORX	S2,IP.CFP		;YES -- ENABLE PRIVS
> ;END TOPS10 CONDITIONAL
	MOVEM	S2,SNDBLK+.IPCFL	;STORE SEND FLAGS

TOPS10 <
SNDM.3:	MOVE	S1,[IPCSLN,,SNDBLK]		;ARG FOR UUO
	IPCFS.	S1,			;SEND THE MESSAGE
	  JRST	SNDM.4			;SEE WHY WE LOST
	$RETT				;GIVE A GOOD RETURN
> ;END TOPS10 CONDITIONAL

TOPS20 <
SNDM.3:	MOVEI	S1,IPCSLN		;NUMBER OF WORDS IN BLOCK
	MOVEI	S2,SNDBLK		;AND ITS ADDRESS
	MSEND				;SEND IT
	  JRST	SNDM.4			;SEE WHY WE LOST
	$RETT				;GIVE A GOOD RETURN
>	;END TOPS20 CONDITIONAL

;SNDMSG CONTINUED ON NEXT PAGE
;SNDMSG CONTINUED FROM PREVIOUS PAGE

;HERE TO HANDLE SEND FAILURES

SNDM.4:	CAXE	S1,IPE.SQ		;SENDER'S QUOTA FULL?
	CAXN	S1,IPE.RQ		;OR RECIEVER'S QUOTA FULL?
	 JRST	SNDM.5			;YES -- THEN TRY AGAIN
	CAXE	S1,IPE.SF		;FREE SPACE EXAUSTED?
	 JRST	SNDM.7			;NO -- THEN FAIL

;HERE TO HANDLE TRANSIENT SEND FAILURES

SNDM.5:	SOJL	P3,SNDM.6		;TIME TO GIVE UP?
	$SLEEP	RT.SLP			;WAIT FOR CONDITION TO CLEAR
	JRST	SNDM.3			;THEN TRY THE SEND AGAIN

SNDM.6:	CAXN	S1,IPE.SF		;NO SYSTEM FREE SPACE?
	 $RETE(SLE)			;YES -- SYSTEM LIMIT EXCEEDED
	CAXN	S1,IPE.RQ		;IS RECEIVER'S QUOTA FULL?
	 $RETE(RQF)			;YES -- RETURN ERROR
	CAXN	S1,IPE.SQ		;IS SENDER'S QUOTA FULL?
	 $RETE(SQF)			;YES -- RETURN ERROR
SNDM.7:	CAXE	S1,IPE.DU		;UNKNOWN DESTINATION?
	 $RETE(USE)			;NO -- UNEXPECTED SYSTEM ERROR
	SKIPL	P4			;YES --WAS THERE A SYSTEM INDEX?
	SETZM	PIDTAB(P4)		;YES -- REMEMBER IT'S GONE AWAY
	$RETE(NSP)			;RETURN NO SUCH PID
SUBTTL	C%INTR - Interrupt level routine to flag message available

;Called to note the fact that an IPCF interrupt has occured

;CALL IS:	No arguments
;
;TRUE RETURN:	Always


C%INTR:	SKIPN	PSIFLG			;ARE IPCF INTERRUPTS EXPECTED?
	  $STOP(UIR,Unexpected IPCF interrupt received)
	SETOM	MSGFLG			;FLAG THAT INTERRUPT HAS OCCURED
TOPS10 <
	MOVE	S1,@IPCINT		;GET ASSOCIATED VARIABLE
	SKIPN	IPCSTS			;ALREADY SETUP
	MOVEM	S1,IPCSTS		;NO..SET IT UP
>;END TOPS10 CONDITIONAL
	$RETT				;TAKE A GOOD RETURN

SUBTTL	C%RECV - Non-blocking IPCF receive

;C%RECV returns the next message from the IPCF queue or error ERNMA$
;	indicating that no messages are outstanding.
;
;CALL IS:	No arguments
;
;TRUE RETURN:	S1/ CONTAINS POINTER TO MDB (SEE GLXMAC)
;  OR
;FALSE RETURN:	S1/ CONTAINS ERROR CODE FOR FAILURE


C%RECV:	AOSE	MSGFLG			;IF FLAG SAYS THERE IS MESSAGE
	SKIPN	PSIFLG			; OR NO PSI CONNECTION
	SKIPA	S1,[IP.CFB]		;OK -- GET NON-BLOCKING FLAG
	$RETE(NMA)			;OTHERWISE, NO MESSAGE AVAILABLE
	IORM	S1,RCVFLG		;SET THE FLAG
	PJRST	RCVMSG			;AND GO DO THE WORK




SUBTTL	C%BRCV - Blocking IPCF Receive

;C%BRCV differs from C%RECV in that it never returns with the error
;	condition ERNMA$.  If no message is available, C%BRCV will block,
;	waiting for the next IPCF message.
;
;CALL IS:	No arguments
;
;TRUE RETURN:	S1/ CONTAINS POINTER TO MDB (SEE GLXMAC)
;  OR
;FALSE RETURN:	S1/ CONTAINS ERROR CODE (SEE GLXMAC)

C%BRCV:	MOVX	S1,IP.CFB		;GET NON BLOCKING FLAG
	ANDCAM	S1,RCVFLG		;CLEAR IT AND GO DO RECIEVE
SUBTTL	RCVMSG - Work routine to do an actual IPCF receive


RCVMSG:	PUSHJ	P,.SAVE3		;GET SOME AC'S
	SETZ	S1,			;SETUP TO TEST/CLEAR IPCSTS
	EXCH	S1,IPCSTS		;GET STATUS WORD AND RESET
	SKIPN	S1			;ANYTHING SET?
	TXOA	S1,1			;NO -- SET A BIT FOR PAGE MODE
	LOAD	S1,S1,IP.CFV		;YES -- GET ACTUAL MODE
	STORE	S1,RCVFLG,IP.CFV	;STORE MODE FLAG
	JUMPE	S1,RCVM.1		;PACKET?
RCVM.0:	SKIPE	S1,RCVPAG		;NO -- DO WE HAVE A RECIVE PAGE?
	 JRST	RCVM.1			;YES -- NO NEED TO GET ONE
	PUSHJ	P,M%NXPG		;NO --GET A NON-EXISTENT PAGE
	JUMPF	[SETOM	MSGFLG		;OOPS -- CAN'T GET ONE
		 $RETE	(SLE)]		;RETURN ERROR
	HRLI	S1,PAGSIZ		;PLACE PAGE SIZE IN LEFT HALF
	MOVEM	S1,RCVPAG		;AND SAVE IT
RCVM.1:	MOVE	S1,RCVFLG		;GET FLAGS TO USE
	MOVEM	S1,RCVBLK+.IPCFL	;INIT RECIEVE BLOCK
	TXNN	S1,IP.CFV		;PAGE MODE?
	SKIPA	S2,[SZ.PAK,,PACKET]	;NO -- POINT TO PACKET
	MOVE	S2,RCVPAG		;YES -- GET PAGE TO USE
	MOVEM	S2,RCVBLK+.IPCFP	;SAVE PROPER POINTER
	MOVE	S1,MYPID		;RECIEVE ON MY BEHALF
	MOVEM	S1,RCVBLK+.IPCFR
	SETZM	RCVBLK+.IPCFS		;UNKNOWN SENDER -- UNTIL RECIEVE

TOPS10 <
RCVM.2:	MOVE	S1,[IPCRLN,,RCVBLK]	;UUO ARGUMENT
	IPCFR.	S1,			;DO THE RECEIVE
	  JRST	RCVM.3			;WE HAVE AN ERROR, GO ANALYZE IT
	SKIPE	S1			;ANY ASSOCIATED VARIABLE
	MOVEM	S1,IPCSTS		;YES..UPDATE THE STATUS
	LOAD	S2,RCVBLK+.IPCFU	;GET LOGGED IN PPN OF USER
	STORE	S2,RCVMDB+MDB.SD	;STORE IT
	STORE	S2,RCVMDB+MDB.CD	;ALSO USE IT AS CONNECTED DIRECTORY
	MOVE	S2,RCVBLK+.IPCFC	;GET CAPABILTIES WORD
	LOAD	P1,S2,IP.SJN		;GET SENDERS JOB NUMBER
	STORE	P1,P1,MD.PJB		;STORE IT
	TXNE	S2,IP.JAC		;JACCT ON?
	TXO	P1,MD.PWH		;YES, TURN ON WHEEL
	MOVE	S2,RCVBLK+.IPCFU	;GET PPN WORD
	CAMN	S2,OPRPPN		;IS HE THE OPERATOR?
	TXO	P1,MD.POP		;YES, SET OPERATOR
	STORE	P1,RCVMDB+MDB.PV	;SAVE USER PRIVILEGES
	JRST	RCVM.5			;GO FINISH UP
>  ;END TOPS10 CONDITIONAL
TOPS20 <
RCVM.2:	MOVE	S1,ACTPTR		;Get ptr to users acct area
	MOVEM	S1,RCVBLK+.IPCAS	;SAVE IT IN THE BLOCK.
	MOVE	S1,NODPTR		;Get ptr to users node area
	MOVEM	S1,RCVBLK+.IPCLL	;SAVE IT IN THE BLOCK
	DMOVE	S1,[EXP IPCRLN,RCVBLK]	;SET SIZE AND LOCATION OF BLOCK
	MRECV				;DO THE RECEIVE
	  JRST	RCVM.3			;WE HAVE AN ERROR, ANALYZE IT
	SKIPE	S1			;ANY ASSOCIATED VARIABLE
	MOVEM	S1,IPCSTS		;YES..UPDATE THE STATUS
	MOVE	S2,RCVBLK+.IPCFD	;GET LOGGED IN NUMBER
	STORE	S2,RCVMDB+MDB.SD	;STORE AS USER NUMBER
	MOVE	S2,RCVBLK+.IPCSD	;GET THE CONNECTED DIRECTORY
	STORE	S2,RCVMDB+MDB.CD	;AND STORE IT TOO
	LOAD	S1,RCVBLK+.IPCFS	;GET SENDERS PID
	$CALL	C%PIDJ			;GET SENDERS JOB NUMBER
	SKIPT				;FAIL?
	SETZ	S1,			;YES..STORE A ZERO
	STORE	S1,P3,MD.PJB		;AND PUT IT IN THE CORRECT PLACE
	MOVE	S2,RCVBLK+.IPCFC	;GET OS CAPABILITIES
	TXNE	S2,SC%WHL		;SENDER A WHEEL?
	TXO	P3,MD.PWH		;YES
	TXNE	S2,SC%OPR		;SENDER AN OPERATOR?
	TXO	P3,MD.POP		;YES
	TXNE	S2,SC%MNT		;GOT MAINTAINACE PRIVS
	TXO	P3,MD.PMT		;YES!
	MOVEM	P3,RCVMDB+MDB.PV	;STORE THE PRIVS
	JRST	RCVM.5			;GO FINISH UP THE RECEIVE
>  ;END TOPS20 CONDITIONAL


; HERE TO WHEN IPCF RECIEVE FAILS
RCVM.3:	CAXN	S1,IPE.NM		;IS THIS "NO MESSAGE"?
	  $RETE	(NMA)			;YES -- RETURN
	CAXE	S1,IPE.WM		;CHECK FOR "WRONG MODE" ERROR
	  JRST	RCVM.4			;NOPE -- MUST BE REAL ERROR
	MOVX	S1,IP.CFV		;YES --GET PAGE MODE BIT
	XORB	S1,RCVFLG		;SWITCH MODES
	TXNE	S1,IP.CFV		;PAGE MODE
	JRST	RCVM.0			;YES -- GO GET IT RIGHT
	JRST	RCVM.1			;NO -- GO GET A PACKET

RCVM.4:	CAXE	S1,IPE.NR		;CHECK FOR "NO ROOM" (TOPS-10)
	$STOP(IRF,IPCF Reception failure)
	PUSHJ	P,M%IPRM		;TRY TO MAKE SOME ROOM
	JRST	RCVM.1			;TRY AGAIN
;HERE ON A SUCCESSFUL RECEIVE

RCVM.5:	SKIPE	IPCSTS			;MORE MESSAGES IN QUEUE?
	SETOM	MSGFLG			;YES -- SET MSG AVAILABLE FLAG
	LOAD	S1,RCVBLK+.IPCFL	;GET FLAGS
	STORE	S1,RCVMDB+MDB.FG	;STORE INTO MDB
	TXNE	S1,IP.CFV		;DID WE RECIVE A PAGE?
	SETZM	RCVPAG			;YES -- CLEAR OUR PAGE
	LOAD	S1,RCVBLK+.IPCFP	;GET LENGTH AND ADDRESS OF DATA
	STORE	S1,RCVMDB+MDB.MS	;STORE INTO MDB
	LOAD	S1,RCVBLK+.IPCFS	;GET PID OF SENDER
	STORE	S1,RCVMDB+MDB.SP	;STORE AS SENDER'S PID
	LOAD	S1,RCVBLK+.IPCFR	;GET RECEIVER'S PID
	STORE	S1,RCVMDB+MDB.RP	;STORE IT TOO
	ZERO	RCVMDB+MDB.SI		;ASSUME NOT A SPECIAL SENDER
	MOVSI	S1,-SZ.PID		;GET LENGTH OF TABLE
	MOVE	S2,RCVMDB+MDB.SP	;GET SENDER'S PID
	CAME	S2,PIDTAB(S1)		;MATCH SENDER'S PID?
	AOBJN	S1,.-1			;KEEP LOOKING
	TXZN	S1,LHMASK		;WAS IT A MATCH?
	 JRST	RCVM.6			;NO -- GIVE UP
	TXO	S1,SI.FLG		;YES -- SET SPECIAL INDEX FLAG
	MOVEM	S1,RCVMDB+MDB.SI	;STORE INTO INDEX WORD
RCVM.6:	LOAD	S1,RCVMDB+MDB.MS,MD.CNT	;GET SIZE OF MESSAGE
	CAXE	S1,PAGSIZ		;IF NOT A PAGE
	JRST	RCVM.7			;RETURN NOW
	LOAD	S1,RCVMDB+MDB.MS,MD.ADR	;GET PAGE NUMBER
	PUSHJ	P,M%IPRC		;NOTIFY THAT IT IS IN NOW
	LOAD	S1,RCVMDB+MDB.MS,MD.ADR	;GET PAGE NUMBER FROM MDB
	PG2ADR	S1			;CONVERT IT TO AN ADDRESS
	STORE	S1,RCVMDB+MDB.MS,MD.ADR	;STORE IT BACK INTO MDB
RCVM.7:	MOVEI	S1,RCVMDB		;GET POINTER TO MDB AND TAKE
	$RETT				;GENERATE A GOOD RETURN
SUBTTL C%REL  - Release the last message received

; C%REL is used to release the last message received via C%RECV or C%BRCV.
;If this message is a packet, then this is a null operation, and if its
;a page, the page is released.

;CALL IS:	No arguments
;
;TRUE RETURN:	Always

C%REL:	SKIPN	S2,RCVMDB+MDB.MS	;GET SIZE AND ADDRESS OF MESSAGE
	$STOP(RAR,Releasing already released IPCF message) ;ALREADY RELEASED
	ZERO	RCVMDB+MDB.MS		;MARK MESSAGE AS RELEASED
	LOAD	S1,S2,MD.CNT		;GET SIZE OF MESSAGE
	CAXE	S1,PAGSIZ		;IS THIS MESSAGE A PAGE?
	$RETT				;NO, SO RETURN NOW
	LOAD	S1,S2,MD.ADR		;GET ADDRESS OF MESSAGE
	ADR2PG	S1			;GET THE PAGE NUMBER
	PJRST	M%RELP			;RETURN AFTER RELEASING THE PAGE


SUBTTL	C%RPRM	Routine to read IPCF Parameters

;C%RPRM IS USED TO  EXAMINE THE MOST COMMONLY NEEDED
;IPCF PARAMETERS.  THESE INCLUDE THE TOTAL NUMBER OF PIDS AND THE 
;IPCF RECEPTION / SEND QUOTAS.

;CALL IS:	S1/ -1 TO READ PARAMETERS OF PID QUOTA, SND,RCV QUOTAS
;			OR ELSE AN SP.??? SYMBOL TO RETURN THAT ENTRY FROM
;			THE PID TABLE
;
;TRUE RETURN:	IF THE INFORMATION IS AVAILABLE
;		S1/<MAX PIDS>B17+<SND QUOTA>B26+<RCV QUOTA>B35 ;IF S1=-1
;		S1/ PID TABLE ENTRY ; IF S1=0 OR +

C%RPRM:	JUMPGE	S1,RSPID		;IF NON-ZERO, WANT SYSTEM PID
	SETZ	S1,			;SET TO READ IPCF PARAMETERS
	PJRST	IPRM			;GO READ PARAMS AND RETURN
SUBTTL GETPID - Acquire a PID for this job


;CALL IS:	First, Call SETNAM to setup name (if any)
;		S1 - 1 means set JWP
;
;TRUE RETURN:	S1/ PID acquired for this job

GETPID:
TOPS10 <
	$SAVE	<P1,P2,MYPID>		;Save some regs
	PJOB	S2,			;Get our job number
	MOVEM	S2,MYPID		;Save as our (temporary) PID
	SKIPN	P2,S1			;Want JWP?
	TXO	S2,1B0			;NO -- MAKE PID TEMPORARY
	MOVEM	S2,PACKET+.IPCI1	;ARGUMENT
	SETO	P1,			;Set 'named PID flag'
	SKIPE	PACKET+.IPCI2		;Is a name desired?
	JRST	GETP.3			;Yes, must go thru INFO
	SETZ	P1,			;Clear 'named PID flag'
	MOVE	S1,[XWD C%INIT,.IPCSC]	;FUNCTION IS MAKE PID
	MOVX	S2,SP.IPC		;ASK IPCC TO DO IT
	PUSHJ	P,SNDSYS		;SEND IT OFF, GET REPLY
	JUMPF	GETP.2			;Failed, maybe no privs, try INFO
	MOVE	S1,PACKET+.IPCS2	;GET PID RETURNED BY IPCC
	$RETT				;RETURN

;Here to ask INFO for a PID (perhaps named)
GETP.2:	SETZ	S2,			;Indicate no name desired
	PUSHJ	P,SETNAM		;Set up the PACKET
GETP.3:	MOVE	S1,[XWD C%INIT,.IPCII]	;Function to make a named PID, till RESET
	SKIPE	P2			;Want to be job-wide?
	MOVE	S1,[XWD C%INIT,.IPCIJ]	;Function to make a named PID, job wide
	MOVX	S2,SP.INF		;Ask INFO to do it
	PUSHJ	P,SNDSYS		;SEND IT OFF, GET REPLY
	SKIPT				;Ok?, Yes, return it
	$FATAL	<Can't get a PID>
	MOVE	S1,PACKET+.IPCI1	;Get the PID returned by INFO
	SKIPN	P1			;Did we get a name?
	$RETT				;Give that back
	SKIPE	DEBUGW			;ARE WE DEBUGGING?
	$WARN	<^I/NAMMSG/>		;Type the name we're getting
	$RETT				;AND RETURN
> ;END TOPS10 CONDITIONAL


TOPS20 <
	$SAVE	<T1,T2,T3,T4>		;SAVE TEMPS
	MOVX	T1,.MUCRE		;CREATE A PID FUNCTION
	MOVX	T2,IP%CPD+.FHSLF	;CREATE A PID FOR ME
	STORE	S1,T2,IP%JWP		;SET OR CLEAR REQUEST FLAG
	DMOVE	S1,[EXP 3,T1]		;3 WORDS, START AT T1
	MUTIL				;EXECUTE IT
	  $FATAL <Can't get a PID>
	MOVEM	T3,PACKET+.IPCI1	;Save PID obtained
	MOVE	S1,T3			;Set up for quick return
	SKIPN	PACKET+.IPCI2		;Do we need a name?
	$RETT				;No, all done!
	PUSH	P,MYPID			;Save whatever is there now
	MOVEM	S1,MYPID		;Save temp PID while we name ourselves
	SKIPE	DEBUGW			;ARE WE DEBUGGING?
	$WARN	<^I/NAMMSG/>		;TYPE OUT MESSAGE
	MOVE	S1,[XWD C%INIT,.IPCII]	;Setup code to assign name
	MOVX	S2,SP.INF		;Send to INFO
	PUSHJ	P,SNDSYS		;Get name assigned to our PID
	SKIPT				;Did that work?
	$FATAL	<Can't name the PID. Error bits = ^O/RCVMDB+MDB.FG,IP.CFE/>
	MOVE	S1,MYPID		;Get back PID
	POP	P,MYPID			;Put back previous PID
	$RETT				;OK
> ;END TOPS20 CONDITIONAL

;An ITEXT to print out the debugging name
NAMMSG:	ITEXT	<Becoming  ^T20/PACKET+.IPCI2/ (PID = ^O/S1/)>
SUBTTL	KILPID	Routine to delete a pid

;KILL PID IS CALLED DURING INITIALIZATION TO RETURN ANY PID ACQUIRED
;THAT WE NO LONGER NEED.
;Tops10 Alternate entry at KILPDN, to kill a PID via INFO, since
;	the PID to be killed is known to be named

;CALL		S1/ Pid to be killed

;TRUE RETURN:	Pid has been killed

;FALSE RETURN:	Pid wasn't killed

TOPS10 <
KILPID:	MOVEM	S1,PACKET+.IPCI1	;SAVE PID TO BE KILLED
	MOVE	S1,[KILPID,,.IPCSZ]	;CODE,,DELETE PID FUNCTION
	MOVX	S2,SP.IPC		;Try sending to IPCC
	PUSHJ	P,SNDSYS		;SEND IT OFF
	JUMPT	.RETT			;RETURN IF ALL SET
	MOVE	S1,PACKET+.IPCI1	;Get back PID which should have gone
KILPDN:	MOVEM	S1,PACKET+.IPCI2	;Save PID in message to INFO
	MOVE	S1,[KILPID,,.IPCID]	;IPCC won't listen, probably no privs
	MOVX	S2,SP.INF		;Try INFO
	PJRST	SNDSYS			;If that bombs, return F
> ;END TOPS10 CONDTIONAL

TOPS20 <
KILPID:	MOVEM	S1,MTLBLK+1		;SAVE PID TO BE KILLED
	DMOVE	S1,[EXP 1,MTLBLK]	;POINT TO IT
	MOVX	S1,.MUDES		;DESTROY THE PID
	MOVEM	S1,MTLBLK		;SET THE FUNCTION
	MUTIL
	 $RETF
	$RETT
> ;END TOPS20 CONDITIONAL
SUBTTL SPID   - Set a system PID

;SPID sets a system wide pid in the internal pid table and in the
;monitor pid table if not debugging.

;CALL IS:	S1/ Index into the system pid table
;		S2/ Pid to store in system Pid Table
;
;TRUE RETURN:	Pid stored in internal and system pid table
;		(if Debugging -- pid is stored in internal table only)

SPID:	CAIL	S1,1			;MUST BE 1 THRU SZ.PID
	CAXL	S1,SZ.PID		;INDEX IN RANGE?
	 $STOP	(PIR,PID Index out of range)
	CAMN	S2,PIDTAB(S1)		;IS REQUESTED INDEX ALREADY SET?
	$RETT				;YES, NO NEED TO SET IT AGAIN
	MOVEM	S2,PIDTAB(S1)		;STORE MYPID IN INTERNAL TABLE
	SKIPE	DEBUGW			;DEBUGGING?
	$RETT				;YES -- DON'T TELL THE MONITOR
					;NO -- SET PID IN SYSTEM TABLE
TOPS20 <
	MOVEM	S1,MTLBLK+1		;STORE THE TABLE OFFSET
	MOVEM	S2,MTLBLK+2		;STORE PID TOO
	MOVX	S1,.MUSSP		;FUNCTION IS SET SYSTEM PID TABLE
	MOVEM	S1,MTLBLK+0		;STORE IT
	DMOVE	S1,[EXP 3,MTLBLK]	;3 WORD MUTIL BLOCK
	MUTIL				;ASK SYSTEM TO SET THE PID UP
	 $FATAL	<Can't write System PID table>
	$RETT				;AND RETURN
> ;END TOPS20 CONDITIONAL

TOPS10 <
	MOVEM	S1,PACKET+.IPCS1	;STORE FIRST WORD , THE INDEX
	MOVEM	S2,PACKET+.IPCS2	;STORE PID TO SET
	MOVE	S1,[XWD SPID,.IPCWP]	;FUNCTION IS SET SYSTEM PID
	MOVX	S2,SP.IPC		;WANT TO SEND TO IPCC
	PUSHJ	P,SNDSYS		;SEND TO [SYSTEM]IPCC
	JUMPT	.POPJ			;RETURN ALL OK IF WE ARE IN GOOD SHAPE
	 $FATAL	<Can't write System PID table>
> ;END TOPS10 CONDITIONAL
SUBTTL	RSPIDS	Routine to read System Pid tables

;RSPIDS is called from initialization to set up our internal System
;pid table.  It requests all system pids from the monitor or from
;INFO if the pid has a name.  If a Pid exists, it's entry in PIDTAB
;will be non-zero.
;RSPIDS is usually called only during intialization.  It gets a PID for us,
;reads all the PIDS, then destroys the PID
;For hacking around, the ALTNAM table can be twiddled, and
;a debugger can do PUSHJ P,RSPIDS to set up some different PIDs

;CALL		No Arguments

;TRUE RETURN	PIDTAB Contains all valid system pids

RSPIDS:	$SAVE	<P1>			;PRESERVE P1
	MOVE	S1,[XWD PIDTAB,PIDTAB+1] ;Make BLT pointer
	SETZM	PIDTAB			;To clear all the PIDs
	BLT	S1,PIDTAB+MX.PID	;Clear it
TOPS20<				;Get a temporary PID on the -20
	SETZ	S2,			;Indicate no name desired
	PUSHJ	P,SETNAM		;Set up our name
	SETZ	S1,			;Indicate No JWP desired
	PUSHJ	P,GETPID		;Get us a temporary PID
>;End TOPS20
TOPS10<
	PUSHJ	P,GETMIN		;Setup the bare essential PIDs
>;End TOPS10
	PUSH	P,MYPID			;Save whatever is there now
	MOVEM	S1,MYPID		;Save as ours, for now
	MOVSI	P1,-SZ.PID		;DO ALL ENTRIES

RSPD.1:	HRRZ	S1,P1			;LOAD THE INDEX
	PUSHJ	P,RSPID			;GET THE PID
	JUMPF	[CAIE S1,ERARG$		;INVALID INDEX?
		 TDZA S1,S1		;NO -- MUST BE NO SUCH PID
		 SETO S1,		;YES -- MARK INVALID ENTRY
		 JRST .+1]		;RETURN IN LINE
	MOVEM	S1,PIDTAB(P1)		;STORE THE ENTRY
RSPD.2:	AOBJN	P1,RSPD.1		;LOOP THRU ALL ENTRIES
TOPS20<
	MOVE	S1,MYPID		;Get our temporary PID
	PUSHJ	P,KILPID		;Flush it out
>;End TOPS20
	POP	P,MYPID			;Put back the old one
	$RETT				;AND RETURN
SUBTTL	RSPID Routine to return a system pid

;RSPID is called to return system PID when sending by special index.
;If the Pid is not found in our internal table, we request the Pid
;from the monitor (or from INFO if we are debugging and the System
;index has a name.)
;The PID is obtained from the system table unless
; 1) - the DEBUGW is set
;   and ALTNAM(index) contains an address of a string
;or
; 2) - the DEBUGW is set
;   and ALTNAM(index) = 0 (no fooling around), and SPDNAM has a SIXBIT
;		library convention debug name.
;Under normal debug, ALTNAM is 0.
;To fool around, put a -1 in an entry to talk to system component, or
;   put the address of a string which is the name of the PID you want to talk to.

;CALL IS:	S1/ Index into System PID table
;
;TRUE RETURN:	S1/ PID for that index

;FALSE RETURN:	ERARG$		Invalid index
;		ERNSP$		No Such Pid

RSPID:	CAIL	S1,0			;INDEX VALID?
	CAIL	S1,SZ.PID
	 $RETE(ARG)			;NO -- FAIL
	MOVE	S2,S1			;GET THE INDEX
	SKIPE	S1,PIDTAB(S2)		;IS ENTRY IN OUR INTERNAL TABLE?
	 $RETT				;YES -- RETURN

	SKIPN	DEBUGW			;Are we debugging?
	JRST	RSPI.1			;No, never use names
	SKIPGE	S1,ALTNAM(S2)		;Force use of system for this component?
	JRST	RSPI.1			;Yes, go thru system table
	JUMPN	S1,RSPI.2		;If an addr was in there, use that name
	SKIPE	S1,SPDNAM(S2)		;0 in ALTNAM, is there a library entry?
	JRST	RSPI.2			;Yes, use library convention

;Here to get PID from system table
RSPI.1:
TOPS10 <
	MOVEI	S1,.GTSID		;NO -- ASK THE MONITOR
	HRL	S1,S2			;LOAD THE INDEX
	GETTAB	S1,			;GET THE ENTRY
	 $RETE(ARG)			;INVALID INDEX
	SKIPN	S1			;ANY VALUE?
	 $RETE(NSP)			;NO -- RETURN NO SUCH PID
	JRST	RSPI.3			;STORE THE PID

;GETMIN is called before reading the system PID table to setup
; the minimum PIDs we may need to find out the rest of the PIDs
; GETMIN returns a temporary PID
GETMIN:	MOVX	S2,SP.INF		;And index for INFO
	PUSHJ	P,RSPI.1		;Find that one
	PJOB	S1,			;-10, just use job # as PID
					;And return that as pid for caller
	$RETT				;Ignore error (don't depend on INFO)
> ;END TOPS10 CONDITIONAL

TOPS20 <
	MOVX	S1,.MURSP		;READ SYSTEM PID FUNCTION
	MOVEM	S1,MTLBLK+0		;SET FUNCTION
	MOVEM	S2,MTLBLK+1		;SET INDEX
	DMOVE	S1,[EXP 3,MTLBLK]	;POINT TO ARGUMENTS
	MUTIL				;AND ASK THE MONITOR
	 JRST	[CAXE S1,IPCF27		;NO SUCH PID?
		  $RETE(ARG)		;NO -- ASSUME INVALID INDEX
		 $RETE(NSP)]		;YES -- RETURN THE ERROR
	MOVE	S1,MTLBLK+2		;GET THE PID
	MOVE	S2,MTLBLK+1		;GET THE INDEX
	JRST	RSPI.3			;STORE THE PID
> ;END TOPS20 CONDITIONAL
;RSPIDS is continued on the next page
;RSPIDS continued from previous page

;Here to find a system component thru INFO
;Enter with S1/addr of ASCIZ name (LH of S1 = 0)
;	or S1/SIXBIT debug name (LH of S1 .NE. 0)
;	S2/ special system index
RSPI.2:	$SAVE	<P1>			;PRESERVE P1
	MOVE	P1,S2			;SAVE THE INDEX
	MOVEI	S2,NAMTXT		;Assume library convention
	TLNN	S1,-1			;Is S1 SIXBIT?
	MOVEI	S2,[ITEXT (<^T/(S1)/>)]	;No, use different arg
	PUSHJ	P,FNDNAM		;ASK INFO FOR THE PID
	MOVE	S2,P1			;RESTORE THE INDEX
	JUMPF	.POPJ			;RETURN ERROR FROM FNDNAM
RSPI.3:	MOVEM	S1,PIDTAB(S2)		;STORE THE PID
	$RETT
SUBTTL C%MAXP  - Read maximum short packet size

;CALL IS:	No arguments
;
;TRUE RETURN:	S1/ Largest size of short IPCF message

TOPS10 <
C%MAXP:	MOVX	S1,%IPCML		;ASK MONITOR FOR IT
	GETTAB	S1,			;
	  MOVEI	S1,-1			;WILL TAKE "TOO LARGE" FAILURE
	$RETT				;RETURN
> ;END TOPS10 CONDITIONAL

TOPS20 <
C%MAXP:	MOVX	S1,.MUMPS		;ASK MONITOR FOR
	MOVEM	S1,MTLBLK		;LARGEST PACKET SIZE
	DMOVE	S1,[EXP 2,MTLBLK]	;ARG COUNT AND ADDRESS
	MUTIL				;
	  TROA	S1,-1			;LOAD LARGE NUMBER
	MOVE	S1,MTLBLK+1		;GET SIZE OF PACKET
	$RETT				;AND RETURN IT
> ;END TOPS20 CONDITIONAL
SUBTTL CPIDI  - Connect PID to specified interrupt channel

;This routine connects the PID acquired
;to the specified interrupt channel.

;CALL IS:	S1/ Channel to connect PID to
;		S2 / PID to connect
;		TOPS10, IIB is used to setup internal intrpt connection
;TRUE RETURN:	Always

CPIDI:
TOPS20 <
	MOVEM	S1,MTLBLK+2		;STORE CHANNEL
	MOVX	S1,.MUPIC		;FUNCTION IS CONNECT TO PSI
	MOVEM	S1,MTLBLK+0		;SO STORE FUNCTION
	MOVEM	S2,MTLBLK+1		;Save PID to connect
	DMOVE	S1,[EXP 3,MTLBLK]	;SIZE AND LOC OF MUTIL BLOCK
	MUTIL				;DO THE ACTUAL EXEC FUNCTION
	  $STOP(IIF,IPCF to interrupt system connect failed)
	MOVX	S2,1B0			;GET A BIT IN PLACE 0
	MOVN	S1,MTLBLK+2		;GET CHANNEL NUMBER BACK
	LSH	S2,0(S1)		;PUT INTO PROPER PLACE
	MOVX	S1,.FHSLF		;FOR MYSELF
	AIC				;ACTIVATE THE CHANNEL
	  ERJMP	[$STOP(AII,Cannot activate IPCF interrupts)]
	$RETT
> ;END TOPS20 CONDITIONAL

TOPS10 <
	HRLZM	S1,MTLBLK+1		;STORE OFFSET,,0
	PUSH	P,S1			;Save offset
	MOVX	S1,.PCIPC		;REASON IS IPCF RECEPTION
	MOVEM	S1,MTLBLK+0		;STORE IT
	SETZM	MTLBLK+2		;CLEAR PRIORITY LEVEL
	MOVE	S1,[PS.FAC+MTLBLK]	;ADD THE CONDITION
	PISYS.	S1,			;ADD IT
	  $STOP(IIF,IPCF to interrupt system connect failed)
	LOAD	S1,IIB+IB.INT		;ADDRESS OF INTERRUPT VECTOR
	POP	P,S2			;GET VECTOR OFFSET FOR IPCF
	ADDI	S1,.PSVIS(S2)		;GET ADDRESS OF ASSOCIATED VARIABLE
	MOVEM	S1,IPCINT		;SAVE ADDRESS FOR C%INTR
	$RETT				;RETURN
 > ;END TOPS10 CONDITIONAL
SUBTTL	IPRM Read/Write IPCF parameters



;CALL IS:	S1 / -1 TO WRITE,   0 TO READ PARAMETERS
;		S2 / PARAMETERS TO WRITE (IF S1=-1)
;
;TRUE RETURN:	S1 / <MAX PIDS>B17+<SND QUOTA>B26+<RCV QUOTA>B35 ;IF S1=0

IPRM:	PUSHJ	P,.SAVE1		;GET ONE AC
	MOVE	P1,S2			;REMEMBER 2ND ARG
	JUMPE	S1,IPRM.2		;IF READING, SKIP THIS
	HLRZ	S1,S2			;GET THE PID MAX WANTED
	JUMPE	S1,IPRM.1		;IF DEFAULTED, SKIP THIS
	PUSHJ	P,MNPRED		;GET THE CURRENT MAXIMUM
	HLRZ	S2,P1			;GET THE REQUESTED NUMBER
	ADD	S1,S2			;ADD TO CURRENT AMOUNT
	CAIL	S1,1000			;MAXIMUM IN RANGE
	MOVEI	S1,777			;NO..SET TO MAXIMUM
	PUSHJ	P,MNPWRT		;WRITE MAXIMUM NUMBER OF PIDS
	SKIPT				;OK?
	 $FATAL <IPCF privileges required to set maximum number of pids>

IPRM.1:	HRRZ	S1,P1			;GET THE QUOTAS
	JUMPE	S1,.RETT		;IF DEFAULTING, LEAVE IT ALONE
	PUSHJ	P,QTARED		;READ THE CURRENT SETTINGS
	LOAD	S2,S1,IP.SQT		;GET THE SEND QUOTAS
	LOAD	S1,P1,IP.SQT		;GET CURRENT SETTING REQUEST
	ADD	S1,S2			;GET NEW SEND QUOTAS
	CAIL	S1,1000			;MAXIMUM IN RANGE
	MOVEI	S1,777			;NO..SET TO MAXIMUM
	STORE	S1,P1,IP.SQT		;SAVE THE VALUES
	HRRZ	S1,P1			;GET THE QUOTAS AGAIN
	PUSHJ	P,QTAWRT		;WRITE QUOTAS OUT
	JUMPT	.RETT			;IF ALL OK, RETURN NOW
	 $FATAL <IPCF privileges required to set IPCF quotas>

IPRM.2:	PUSHJ	P,MNPRED		;READ MAXIMUM NUMBER OF PIDS
	MOVE	P1,S1			;REMEMBER THE ANSWER
	PUSHJ	P,QTARED		;AND THE QUOTA'S
	SKIPT				;DID WE GET IT?
	$FATAL	<Can't read IPCF quotas>
	HRLM	P1,S1			;MAKE UP THE TWO HALVES
	$RETT				;AND RETURN
SUBTTL MNPRED/MNPWRT - Read/Write maximum number of PIDS

;THESE ROUTINES DO THE SYSTEM DEPENDENT WORK FOR SETTING THE MAXIMUM
;NUMBER OF PIDS FOR A JOB. 
;
; CALL IS:	READ/NO ARGUMENTS  WRITE/S1 MAXIMUM NUMBER OF PIDS
;TRUE RETURN:	READ/S1 MAX NR. OF PIDS	WRITE/NO RETURNED VALUE
;FALSE RETURN:	FAILURE OF SOME SORT

TOPS20 <
MNPWRT:	SKIPA	S2,[.MUSPQ]		;SET MAX. NUMBER OF PIDS
MNPRED:	MOVX	S2,.MUFPQ		;READ MAX. NUMBER OF PIDS
	MOVEM	S2,MTLBLK		;SET IT UP
	MOVEM	S1,MTLBLK+2		;STORE THE DESIRED NUMBER (FOR WRITE)
	MOVE	S1,MYPID		;GET OUR PID
	MOVEM	S1,MTLBLK+1		;SET IT UP
	DMOVE	S1,[EXP 3,MTLBLK]	;3 WORD BLOCK @ MTLBLK
	MUTIL				;ASK THE MONITOR
	  $RETF				;FAILURE
	MOVE	S1,MTLBLK+2		;PICK UP MAX NUMBER OF PIDS
	$RETT				;SUCCESS

> ;END TOPS20 CONDITIONAL

TOPS10 <
MNPRED:	MOVX	S1,777			;LARGE NUMBER OF PIDS AVAILABLE
MNPWRT:	$RETT				;RETURN WITH IT
> ;END TOPS10 CONDITIONAL
SUBTTL QTARED/QTAWRT - Read/Write the Send and Receive Quotas

;CALL IS:	S1/ 0,,<SND QUOTA>B26+<RCV QUOTA>B35 IF WRITING
;TRUE RETURN:	S1/ 0,,<SND QUOTA>B26+<RCV QUOTA>B35 IF READING
;FALSE RETURN:	ON ANY FAILURE OF TASK

TOPS20 <
QTARED:	SKIPA	S2,[EXP .MUFSQ]		;READ THE QUOTA FOR SEND/RECEIVE
QTAWRT:	MOVX	S2,.MUSSQ		;SET QUOTA
	MOVEM	S2,MTLBLK		;SET IT UP
	MOVEM	S1,MTLBLK+2		;STORE THE DESIRED QUOTA (FOR WRITE)
	MOVE	S1,MYPID		;GET OUR PID
	MOVEM	S1,MTLBLK+1		;SET IT UP
	DMOVE	S1,[EXP 3,MTLBLK]	;SET UP 3 WORD MUTIL BLOCK
	MUTIL				;ASK THE MONITOR
	  $RETF				;FAILURE
	MOVE	S1,MTLBLK+2		;PICK UP SEND/RECEIVE QUOTA
	$RETT				;SUCCESS
> ;END TOPS20 CONDITIONAL

TOPS10 <
QTARED:	SKIPA	S2,[EXP .IPCSR]		;READ QUOTAS
QTAWRT:	MOVX	S2,.IPCSQ		;WRITE QUOTAS
	HRLI	S2,QTAWRT		;A GOOD CODE TO USE
	MOVEM	S1,PACKET+.IPCS2	;STORE QUOTA FOR WRITE
	MOVE	S1,MYPID		;GET OUR PID
	MOVEM	S1,PACKET+.IPCS1	;STORE IT AWAY 
	MOVX	S1,SP.IPC		;SEND TO IPCC
	EXCH	S1,S2			;WHOOPS, BUILT IT BACKWARDS
	PUSHJ	P,SNDSYS		;SEND IT OFF
	MOVE	S1,PACKET+.IPCS2	;GET RESPONSE
	POPJ	P,			;PASS ON SNDSYS'S TF VALUE
> ;END TOPS10 CONDITIONAL
SUBTTL SETNAM - Routine to declare our name to INFO

;SETNAM is used to setup the name in the packet about to go to INFO or IPCC
;This allows programs to communicate
; by other means than the system PID table.  This is useful for debugging
; purposes when multiple components are going to be used.
;SETNAM should always be called just before calling GETPID

;CALL:		S2/ Addr of ITEXT of name to write
;		 or 0, to set up no name
;
;TRUE RETURN:	Always, name has been established
;		2 nd  word of PACKET has 0 or name,
;		  STACP has incremented pointer


SETNAM:	SETZM	PACKET+.IPCI2		;Clear name from message
	PUSH	P,[POINT 7,PACKET+.IPCI2] ;GET POINTER TO MESSAGE AREA
	POP	P,STACP			;STORE THAT POINTER
	JUMPE	S2,.RETT		;If no name desired, we're done
	$TEXT(STAC,<^I/(S2)/^0>)	;CREATE THE NAME
	$RETT				;RETURN SUCCESS


;FNDNAM is used to ask INFO for the pid of a specified name
;  It is called by GETPID to look for our name and by RSPIDX
;  to check for Private Quasar and Private Orion

;CALL:		S2/ addr of ITEXT to build name

;TRUE RETURN:	S1/ Pid of Specified Name

FNDNAM:	PUSHJ	P,SETNAM		;Set up name in message
	MOVE	S1,[XWD FNDNAM,.IPCIW]	;FUNCTION IS FIND PID FOR NAME
	MOVX	S2,SP.INF		;COMMUNICATE WITH [SYSTEM]INFO
	PUSHJ	P,SNDSYS		;SEND TO SYSTEM, WAIT FOR REPLY
	 JUMPF	[$RETE(NSP)]		;RETURN NO SUCH PID
	SKIPE	S1,PACKET+.IPCI1	;GET THE PID
	$WARN	<Alternate ^T20/PACKET+.IPCI2/ (PID = ^O/S1/)> ;SHOW THE NAME
	$RETT				;RETURN SUCCESS
SUBTTL SNDSYS - Routine to converse with [SYSTEM]INFO & IPCC


;SNDSYS is used to carry on a SEND-RECEIVE dialog with the system
; IPCF facilities

;CALL IS:	S1/ CODE WORD TO USE, I.E. ID,,FUNCTION CODE
;		S2/ CANONICAL SYSTEM INDEX TO SEND TO, EITHER SP.IPC OR SP.INF
;
;TRUE RETURN:	If acknowledgement comes back successfully
;
;FALSE RETURN:	If for any reason we cannot sent, or the
;		response contains an error.

SNDSYS:	$SAVE	<P1,P2,SNDFLG,RCVMDB+MDB.MS>	;PRESERVE WHAT WE TOUCH
	DMOVE	P1,S1			;SAVE INPUT ARGUMENTS
	MOVEM	S1,PACKET+.IPCI0	;STORE THE CODE WORD AWAY
	CAXN	P2,SP.INF		;IF SENDING TO INFO,
	ZERO	PACKET+.IPCI1		;NO ONE IS TO BE COPIED
	MOVEI	S1,PACKET		;GET LOCATION OF PACKET
	MOVEM	S1,SNDSAB+SAB.MS	;STORE MESSAGE LOCATION

TOPS10 <
	CAXN	P2,SP.IPC		;SENDING TO IPCC?
	SKIPA	S1,[EXP PACKET+2]	;YES -- FORCE PACKET LENGTH TO 3
					;NO -- COMPUTE PACKET LENGTH
> ;END TOPS10 CONDITIONAL

TOPS20 <
	SKIPN	MYPID			;DO WE HAVE A PID?
	$STOP	(SWP,Called SNDSYS without a PID);Something has gone wrong
> ;END TOPS20 CONDITIONAL

SNDS.1:	HRRZ	S1,STACP		;HERE TO SEND TO INFO
	SUBI	S1,PACKET-1		;COMPUTE SIZE
	MOVEM	S1,SNDSAB+SAB.LN	;STORE AS MESSAGE LENGTH
	SKIPN	S1,PIDTAB(P2)		;GET PROPER SYSTEM PID
	 $FATAL	<Attempt to send to non-existant system component>
	MOVEM	S1,SNDSAB+SAB.PD	;SEND IS BY PID
	ZERO	SNDSAB+SAB.SI		;NOT BY INDEX

;SNDSYS CONTINUED ON NEXT PAGE
;SNDSYS CONTINUED FROM PREVIOUS PAGE

	MOVEI	S1,SAB.SZ		;SIZE OF SAB
	MOVEI	S2,SNDSAB		;AND ITS LOCATION
	PUSHJ	P,C%SEND		;SEND IT OFF
	JUMPF	.POPJ			;RETURN ERROR IF SEND FAILS
SNDS.2:	PUSHJ	P,C%BRCV		;DO A WAITING RECEIVE NOW
	JUMPF	.RETF			;IF ANY SORT OF ERROR, GIVE UP
	LOAD	S1,RCVMDB+MDB.SI,SI.IDX	;GET THE SPECIAL PID INDEX
	CAME	S1,P2			;REPLY FROM DESTINATION?
	JRST	SNDS.3			;NO, TRY AGAIN
	MOVE	S1,PACKET+.IPCI0	;GET CODE WORD
	CAME	S1,P1			;DOES IT MATCH WHAT WE SENT?
	JRST	SNDS.3			;NO
	LOAD	S1,RCVMDB+MDB.FG,IP.CFE	;DID WE GET ANY ERRORS?
	JUMPN	S1,.RETF		;IF WE DID, GIVE UP NOW
	$RETT				;OTHERWISE, RETURN A GOOD RETURN

SNDS.3:	PUSHJ	P,C%REL			;RELEASE THE UNWANTED MESSAGE
	JRST	SNDS.2			;AND REPEAT THE RECEPTION
SUBTTL STAC   - Routine to build INFO messages

; STAC IS USED IN THE $TEXT INSTRUCTION TO DEPOSIT CHARACTERS INTO
; THE MESSAGE THAT IS SENT TO SYSTEM-INFO

STAC:	IDPB	S1,STACP		;STORE A BYTE
	HRRZ	S1,STACP		;GET THE BYTE POINTER ADDRESS PART
	SUBI	S1,PACKET		;SUBTRACT OFF START OF PACKET
	CAILE	S1,SZ.PAK		;STILL INSIDE PACKET?
	$RETF				;NO, FORCE A STOP
	$RETT				;OTHERWISE, RETURN GOODLY
SUBTTL	C%PIDJ	Returb PID owners job number


;CALL IS:	S1/ PID
;
;TRUE RETURN	S1/ Job number of PID's owner

TOPS20 <
C%PIDJ:	MOVEM	S1,MTLBLK+1		;USE MUTIL TO FIND JOB ASSOCIATED
	MOVX	S1,.MUFOJ		;WITH THIS PID
	MOVEM	S1,MTLBLK		;
	DMOVE	S1,[EXP 3,MTLBLK]	;ARG COUNT AND ADDRESS
	MUTIL
	 $RETF				;CAN'T GET JOB NUMBER OF PID
	MOVE	S1,MTLBLK+2		;GET THE JOB NUMBER
	$RETT				;AND RETURN
> ;END TOPS20 CONDITIONAL

TOPS10 <
C%PIDJ:	MOVX	S2,%IPCPM		;GET SYSTEM PID MASK
	GETTAB	S2,			;FROM MONITOR
	  $RETF				;CAN'T GET PID MASK
	AND	S1,S2			;AND TO GET PID TABLE OFFSET
	MOVSS	S1			;REVERSE TO GET GETTAB INDEX
	HRRI	S1,.GTPID		;AND NOW LOOK INTO PID TABLE
	GETTAB	S1,			;TO GET THE JOB NUMBER
	  $RETF				;CAN'T GET JOB NUMBER OF PID
	AND	S1,S2			;STRIP ALL BUT JOB NUMBER
	JUMPE	S1,.RETF		;NO OWNER
	$RETT				;RETURN THE JOB
> ;END TOPS10 CONDITIONAL
IPC%L:				;LABEL THE LITERAL POOL
	END