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MVS.RELAY.EXEC
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MVS.RELAY.EXEC
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/* RELAY EXEC CHAT PROGRAM */
/* */
/* An NJE (bitnet/HNET) chat server */
/* for z/VM, VM/ESA and VM/SP, MVS 3.8 */
/* by collaboration of Peter Jacob, */
/* Mike Grossman, Moshix */
/* */
/* copyright 2020, 2021 by moshix */
/* Apache 2.0 license */
/***************************************/
/* CHANGE HISTORY */
/* V0.1-1.0: testing WAKEUP mechanism */
/* v1.0-1.9: double linked list for in memory processing,bug fixing*/
/* v2.0 : Configurble parameters, remove hardwired data */
/* v2.1 : Add LPAR and machine measurement for stats */
/* v2.2 : Add /SYSTEM command */
/* v2.3 : Make VM/SPrel6 compatible via compatibility=1 parm */
/* v2.4 : Add /FORCE option to force off users (sysop only) */
/* v2.5 : Loop detetector incoming msg counter v1.0 */
/* v2.6 : Add federation v1.0, loop detector v2.0 */
/* v2.7 : loop detector v2.0 */
/* v2.7.1 : autodetect who am i */
/* v2.7.2 : fix stats, high msg rate and last time user seen */
/* v2.7.3 : loop detector disabled for now until i figure it out */
/* v2.7.4 : differentiate compatibility for VMSP,VMESA and z/VM */
/* v2.7.5 : port to BREXX/MVS 3.8 */
/* v2.7.6 : removed federation, whoami, highrate, */
/* v2.7.7 : add /ROOM option */
/* v2.7.8 : add HEARTBEAT function to check availability of RELAY */
/* v2.7.9 : added many error conditions detection */
/* v3.0.0 : Ported forward to RELAY EXEC 3.0.0 for z/VM, VM */
/* v3.0.1 : Allow empty message lines when sendin */
SIGNAL on SYNTAX /* allow graceful termination in case of errors */
/* configuraiton parameters - IMPORTANT */
relaychatversion="3.0.1" /* needed for federation compatibility check */
timezone="CDT" /* adjust for your server IMPORTANT */
maxdormant =1800 /* max time user can be dormat */
localnode="HOUCICS" /* localnode is now autodetected as 2.7.1 */
shutdownpswd="132322229" /* any user with this passwd shuts down rver*/
osversion="MVS 3.8 tk4-8"/* OS version for enquries and stats */
typehost="Hyperion" /* what kind of machine */
hostloc ="Chicago,IL " /* where is this machine */
sysopname="Moshix " /* who is the sysop for this chat server */
sysopemail="000001@gmail" /* where to contact this systop */
compatibility=1 /* 1 VM/SP or MVS3.8, 2=VM/ESA,3=z/VM */
sysopuser='HERC01' /* sysop user who can force users out */
sysopnode=translate(localnode) /* sysop node automatically set */
debugmode=0 /* print debug info on RELAY console when 1 */
raterwatermark=12000 /* max msgs per minute set for this server */
send2ALL=0 /* 0 send chat msgs to users in same room */
/* 1 send chat msgs to all logged-in users */
/* global variables */
returnNJEmsg= "HCPMSG045E"/* messages returning for users not logged on */
returnNJEmsg2="DMTRGX334I"/* looping error message flushed */
returnNJEmsg3="HCPMFS057I"/* RSCS not receiving message */
returnNJEmsg4="DMTPAF208E"/* Invalid user ID message */
returnNJEmsg5="DMTPAF210E"/* RSCS DMTPAF210E Invalid location */
loggedonusers = 0 /* online user at any given moment */
highestusers = 0 /* most users online at any given moment */
totmessages = 0 /* total number of msgs sent */
otime = 0 /* overtime to log off users after n minutes */
starttime=mytime() /* for /SYSTEM */
starttimeSEC=ExTime() /* for msg rate calculation */
logline = " " /* initialize log line */
receivedmsgs=0 /* count received msgs for high rate detec*/
loopCondition=0 /* when 1 there is a msg loop condition */
/*---------------CODE SECTION STARTS BELOW --------------------------*/
whoamiuser="RELAY"
CALL WTO "RELAY CHAT v"||relaychatversion||" on: "||localnode||" has started"
CALL WTO "SEND TO ALL MODE (0=ONLY THOSE IN SAME ROOM, 1=DON'T SEND TO ALL): "||SEND2ALL
NJEUID="RELAY" /* register with NJE38 */
CALL WTO "REL003I THIS NJE USER: "||NJEUID
/* register with NJE38 EXIT now */
CALL __NJEINIT /* SETUP ENVIRONMENT */
RC = __NJEREGISTER(NJEUID) /* REGISTER USERID */
IF RC =0 then _crly=1 /* set NJECRLY is registered */
else do /* when register failed, terminate */
CALL WTO "REL009S USER REGISTRATION FAILED WITH RC("RC")"
exit 8
END
/* ok, we succeeded in registering RELAY to NJE38 */
CALL WTO "REL001I RELAY EXEC HAS REGISTERED WITH NJE38"
/* init double linked list of online users */
call @init
CALL log('List has been initialized..')
CALL log('List size: '||@size())
/*-------------------------------------------*/
receivedmsgs=0
/* --------------------------------------------------------------------
* NJE Message Handler
* runs until stopped by operator command /P in console
* --------------------------------------------------------------------
*/
do forever
event = __njereceive(5000)
select
when event = #msg then do
receivedmsgs= receivedmsgs + 1
CALL WTO "REL010I RECEIVED NJE MESSAGE: "||_data
call handlemsg strip(_data)
end
when event = #stop then ,
call endSTC "NJERELAY STC TERMINATED BY OPERATOR",0
when event = #error then ,
call endstc "NJERELAY STC TERMINATED BY ERROR("_RC")",event
when event = #timeout then do
/* Time out occurred, you can add housekeeping here */
end
end
end
/* --------------------------------------------------------------------
* Shut Down STC
* when its time to quit, come here
* --------------------------------------------------------------------
*/
endSTC:
parse arg msg,exc
CALL WTO 'Before DEREG 'msg', RC= 'exc
say __NJEDEREGISTER(NJEUID)
CALL WTO 'After DEREG 'msg', RC= 'exc
exit exc
/* --------------------------------------------------------------------
* REXX abnormal termination occurred, terminate gracefully
* --------------------------------------------------------------------
*/
syntax:
if _crly=1 then CALL __NJEDEREGISTER(NJEUID)
exit 16
/* --------------------------------------------------------------------
* Old VM coding, not supported in MVS 3.8 NJE
* --------------------------------------------------------------------
*/
/* ####### not supported in MVX
'WAKEUP RESET'; /* turn messages from IUCV to ON */
'SET MSG ON'
'DROPBUF'
* ####### */
exit
/* --------------------------------------------------------------------
* Handle all incoming Messages
* --------------------------------------------------------------------
*/
handlemsg:
/* handle all incoming messages and send to proper method */
/* _data must be parsed for user, node, message */
PARSE ARG . ' ' NODE '(' USERID '):' TEXT
/* "From userid: /... comes in when message was sent by same system*/
if userid='' then do
PARSE ARG . USERID':' TEXT
node = localnode
CALL WTO "REL400I MSG RECEIVED FROM: "||USERID||" @ "||NODE
end
/* TEXT = STRIP(TEXT). */
UMSG = TRANSLATE(TEXT)
node= STRIP(node)
CurrentTime=Extime()
receivedmsgs= receivedmsgs + 1
call highrate (receivedmsgs)
if errorhandler(loopmsg) > 1 then do
loopCondition = 1
/* silently drop message and don't process it */
call log('Loop detector triggered for user: '||userid||'@'||node)
call WTO "REL199S MESSAGE LOOP CONDITION DETECTED!! MAY NEED TO KILL RELAY NOW"
return
end
updbuff=1
SELECT /* HANDLE MESSAGE TYPES */
when (umsg = "/WHO") then
call sendwho userid,node
when (umsg = "/SYSTEM") then
call systeminfo userid,node
when (umsg = "/STATS") then
call sendstats userid,node
when (umsg = "/LOGOFF") then do
call logoffuser userid,node
updbuff=0 /* removed, nothing to update */
end
when (umsg = "/LOGON") then do
call logonuser userid,node
call enterRoom userid,node,'GENERAL'
updbuff=0 /* already up-to-date */
end
when (pos("/ROOMS",umsg)>0) then do
call ShowRooms
end
when (pos("/ROOM",umsg)>0) then do
call EnterRoom userid,node,umsg
end
when umsg='/ECHO' then do
CALL TELLNJE userid 'AT' node 'USER: 'userid' Node: 'node
end
when (pos("/HEARTBEAT",umsg)>0) then do
CALL TELLNJE userid 'AT' node' 'time('L')' 'time('US')
end
when (umsg = "/HELP") then do
call helpuser userid,node
end
when (umsg = shutdownpswd) then do
call log("Shutdown initiated by: "||userid||" at node "||node)
call endstc("Shutdown initiated by: "||userid||" at node "||node,0)
end
otherwise
call sendchatmsg userid,node,text
end
if updBuff=1 then call refreshTime currentTime,userid,node /* for each msg ! */
call CheckTimeout currentTime
return
/* --------------------------------------------------------------------
* tellNJE replaces the VM TELL command and uses NJE38 Message instead
* e.g. CALL TELLNJE userid 'AT' node '/WHO for connected users'
* --------------------------------------------------------------------
*/
tellNJE:
parse arg $userid' 'isat' '$node' 'njemsg
'NJE38 M '$node $userid njemsg
return rc
/* --------------------------------------------------------------------
* SYSOP forces a user out
* --------------------------------------------------------------------
*/
/* -----------------------------------------------------------------
* SENDCHAT Message to all Logged-in users or
* Members of the same room
* -----------------------------------------------------------------
*/
sendchatmsg:
/* what we got is a message to be distributed to all online users */
parse ARG userid,node,msg
listuser = userid || "@"||node
if pos('/'listuser,$.@)=0 then do
/* USER NOT LOGGED ON YET, LET'S SEND HELP TEXT */
CALL TELLNJE userid 'AT' node 'You are currently NOT logged on.'
CALL TELLNJE userid 'AT' node 'Wecome to RELAY chat for z/VM v'relaychatversion
CALL TELLNJE userid 'AT' node '/HELP for help, or /LOGON to logon on'
totmessages = totmessages + 3
return
end
/* USER IS ALREADY LOGGED ON */
/* -----------------------------------------------------------------
* this coding sends the message to all logged-in users
* -----------------------------------------------------------------
*/
if send2ALL=1 then do
do ci=1 to words($.@)
entry=word($.@,ci)
if entry='' then iterate
parse value entry with '/'cuser'@'cnode'('otime')'
if userid \= "RSCS" & userid \= "RELAY" then do
/* This avoids loops for unknown errors coming from RSCS/RELAY */
CALL TELLNJE cuser 'AT' cnode '<> 'userid'@'node':'msg
totmessages = totmessages+ 1
end
end
return
end
/* -----------------------------------------------------------------
* this coding sends the message to all logged-in room mates
* send2ALL is 0
* -----------------------------------------------------------------
*/
myRoom=$Room.userid
do ci=1 to words($Room.myRoom)
entry=word($Room.myRoom,ci)
if entry='' then iterate
if entry=userid'@'node then iterate /* don't send msgs to yourself */
CALL TELLNJE userid 'AT' node 'Message sent to: 'entry
parse value entry with cuser'@'cnode
CALL TELLNJE cuser 'AT' cnode '<> 'userid'@'node':'msg
totmessages = totmessages+ 1
end
return
sendwho:
/* who is online right now on this system? */
userswho = 0 /* counter for seen usres */
parse ARG userid,node
listuser = userid || "@"||node
CALL TELLNJE userid 'AT' node '> List of currently logged on users:'
totmessages = totmessages + 1
do ci=1 to words($.@)
entry=word($.@,ci)
if entry='' then iterate
parse value entry with '/'cuser'@'cnode'('otime')'
currenttime=Extime()
lasttime=currenttime-otime
call TELLNJE ,
userid 'AT' node '> ' cuser'@'cnode' - last seen: 'lasttime' seconds ago'
totmessages = totmessages + 1
userswho = userswho + 1
end
CALL TELLNJE userid 'AT' node '> Total online right now: 'userswho
loggedonusers = userswho
totmessages = totmessages + 1
return
logoffuser:
parse ARG userid,node
listuser = userid || "@"||node
ppos=pos('/'listuser,$.@)
if ppos=0 then do
call log("User logoff rejected, not logged-on: "||listuser)
return
end
rpos=pos(' ',$.@,ppos+1)
if rpos=0 then rpos=length($.@)+1
rlen=rpos-ppos
$.@=overlay(' ',$.@,ppos,rlen)
$.@=space($.@)
loggedonusers = loggedonusers - 1
call exitRoom userid,node
CALL log('List size: '||@size())
CALL TELLNJE userid 'AT' node '-> You are logged off now.'
CALL TELLNJE userid 'AT' node '-> New total number of users: 'loggedonusers
totmessages = totmessages + 2
return
logonuser:
/* add user to linked list */
parse ARG userid,node
listuser = userid"@"node
if pos('/'listuser,$.@)>0 then do
call log("List already logged-on: "||listuser)
CALL TELLNJE userid 'AT' node '-> You are already logged on.'
CALL TELLNJE userid 'AT' node '-> total number of users: 'loggedonusers
end
else do
if loggedonusers < 0 then loggedonusers = 0
loggedonusers = loggedonusers + 1
if highestusers < loggedonusers then highestusers = highestusers + 1
call @put '/'listuser'('currentTime')'
call log("List user added: "||listuser)
CALL log('List size: '||@size())
CALL TELLNJE userid 'AT' node '-> LOGON succeeded. '
CALL TELLNJE userid 'AT' node '-> Total number of users: 'loggedonusers
call announce userid, node /* announce to all users of new user */
end
totmessages = totmessages+ 2
return
/* -----------------------------------------------------------------
* Enter Chat Room. Messages will be sent only to users of the
* same chat room.
* -----------------------------------------------------------------
*/
enterRoom:
parse upper arg _user,_node,_room
if word(_room,1)='/ROOM' then _room=word(_room,2)
rml=length(_room)
if rml<3 | rml>10 then ,
CALL TELLNJE userid 'AT' _node 'Room must not be below 3 or exceed 10 characters :'_room
else do
if symbol('allrooms')<>'VAR' then allrooms=''
else if pos('/'_room,allrooms)=0 then allrooms=allrooms' /'_room
call exitRoom _user,_node
$Room._user=_room
if symbol('$Room._room')=='VAR' then $Room._room=$Room._room' '_user'@'_node
else $Room._room=_user'@'_node
CALL TELLNJE userid 'AT' _node 'You have entered room: '_room
end
totmessages = totmessages + 1
return 0
/* -----------------------------------------------------------------
* Show available Rooms and assigned users
* -----------------------------------------------------------------
*/
ShowRooms:
if symbol('allrooms')<>'VAR' | words(allrooms)=0 then do
CALL TELLNJE userid 'AT' _node 'There are no rooms open yet'
totmessages = totmessages + 1
return
end
do ri=1 to words(allrooms)
troom=substr(word(allrooms,ri),2)
if symbol('$Room.troom')<>'VAR' then iterate
tusers=$Room.troom
CALL TELLNJE userid 'AT' _node troom' has 'words(tusers)' user(s)'
CALL TELLNJE userid 'AT' _node ' Users : 'tusers
totmessages = totmessages+2
end
return 0
/* -----------------------------------------------------------------
* Exit curret CHAT Room, new one will be assigned by enterRoom
* -----------------------------------------------------------------
*/
exitRoom:
parse arg _user,_node
myRoom=$Room._user
$Room._user='' /* clear current room entry */
troom=''
if symbol('$Room._room')<>'VAR' then return
do ci=1 to words($Room.myRoom)
if word($Room.myRoom,ci)=_user'@'node then do
CALL TELLNJE userid 'AT' node '-> You left room 'myRoom
totmessages = totmessages + 1
iterate
end
troom=troom' 'word($Room.myRoom,ci)
end
$Room.myRoom=troom
return
systeminfo:
/* send /SYSTEM info about this host */
parse ARG userid,node
listuser = userid"@"node
CALL TELLNJE userid 'AT' node '-> NJE node name : 'localnode
CALL TELLNJE userid 'AT' node '-> Relay chat version : 'relaychatversion
CALL TELLNJE userid 'AT' node '-> OS for this host : 'osversion
CALL TELLNJE userid 'AT' node '-> Type of host : 'typehost
CALL TELLNJE userid 'AT' node '-> Location of this host: 'hostloc
CALL TELLNJE userid 'AT' node '-> Time Zone of : 'timezone
CALL TELLNJE userid 'AT' node '-> SysOp for this server: 'sysopname
CALL TELLNJE userid 'AT' node '-> SysOp email addr : 'sysopemail
if compatibility > 2 then do
page=paging()
rstor=rstorage()
cfg=configuration()
lcpus=numcpus()
/* parse var mcpu mpage mcf mrstor mlcpus */
CALL TELLNJE userid 'AT' node '-> Pages/Sec : 'page
CALL TELLNJE userid 'AT' node '-> IBM Machine Type : 'cfg
CALL TELLNJE userid 'AT' node '-> Memory in LPAR or VM : 'rstor
CALL TELLNJE userid 'AT' node '-> Number of CPUs : 'lcpus
end
if compatibility > 2 then do
totmessages = totmessages + 12
end
else do
totmessages = totmessages + 8
end
return
sendstats:
/* send usage statistics to whoever asks, even if not logged on */
parse ARG userid,node
onlinenow = countusers(userid,node)
/* parse value translate(diag(8,"INDICATE LOAD"), " ", "15"x) ,
with 1 "AVGPROC-" cpu "%" 1 "PAGING-" page "/"
cpu = right( cpu+0, 3) */
actualtime=Extime()
elapsedsec=(actualtime-starttimeSEC)
if elapsedsec = 0 then elapsedsec = 1 /* avoid division by zero on Jan 1 at 00:00 */
msgsrate = (receivedmsgs + totmessages) / elapsedsec
msgsratef= FORMAT(msgsrate,4,2) /* rounding */
msgsratef = STRIP(msgsratef)
listuser = userid"@"node
CALL TELLNJE userid 'AT' node '-> Total number of users : '@size()
CALL TELLNJE userid 'AT' node '-> Hihgest nr. of users : 'highestusers
CALL TELLNJE userid 'AT' node '-> Total number of msgs : 'totmessages
CALL TELLNJE userid 'AT' node '-> Messages rate /minute : 'msgsratef
CALL TELLNJE userid 'AT' node '-> Server up since : 'starttime' 'timezone
/* CALL TELLNJE userid 'AT' node '-> System CPU laod : 'STRIP(cpu)'%' */
CALL TELLNJE userid 'AT' node '-> RELAY CHAT version : v'relaychatversion
totmessages = totmessages+ 6 /* reduced due to no CPU busy in MVS */
return
helpuser:
/* send help menu */
parse ARG userid,node
listuser = userid"@"node
CALL TELLNJE userid 'AT' node '.____ ____ __ __ _ _ ___ _ _ __ ____ '
CALL TELLNJE userid 'AT' node '( _ \( ___)( ) /__\ ( \/ ) / __)( )_( ) /__\ (_ _)'
CALL TELLNJE userid 'AT' node '.) / )__) )(__ /(__)\ \ / ( (__ ) _ ( /(__)\ )( '
CALL TELLNJE userid 'AT' node '(_)\_)(____)(____)(__)(__)(__) \___)(_) (_)(__)(__)(__) '
CALL TELLNJE userid 'AT' node '. '
CALL TELLNJE userid 'AT' node ' RELAY CHAT for z/VM, VM/ESA, VM/SP MVS v'relaychatversion
CALL TELLNJE userid 'AT' node '. '
CALL TELLNJE userid 'AT' node '. '
CALL TELLNJE userid 'AT' node '/HELP for this help'
CALL TELLNJE userid 'AT' node '/WHO for connected users'
call tellNJE ,
userid 'AT' node '/LOGON to logon and start getting chat messages'
CALL TELLNJE userid 'AT' node '/LOGOFF to logoff and stop getting chat messages'
CALL TELLNJE userid 'AT' node '/STATS for chat statistics'
CALL TELLNJE userid 'AT' node '/SYSTEM for info aobut this host'
CALL TELLNJE userid 'AT' node '/HEARTBEAT to check if still up '
CALL TELLNJE userid 'AT' node '/ROOM to select a ROOM (3-10 chars)'
CALL TELLNJE userid 'AT' node '/ROOMS to see who is in what room'
CALL TELLNJE userid 'AT' node '. '
CALL TELLNJE userid 'AT' node ' messages with <-> are incoming chat messages...'
CALL TELLNJE userid 'AT' node ' messages with > are service messages from chat servers'
totmessages = totmessages + 18
return
countusers:
parse ARG userid,node
listuser = userid"@"node
onlineusers = 0
do ci=1 to words($.@)
entry=word($.@,ci)
if entry='' then iterate
parse value entry with '/'cuser'@'cnode'('otime')'
lasttime=ctime-otime
onlineusers = onlineusers + 1
end
return onlineusers
announce:
/* announce newly logged on user to all users */
parse ARG userid,node
cj=0 /* save logons to remove, else logon buffer doesn't match */
do ci=1 to words($.@)
entry=word($.@,ci)
if entry='' then iterate
parse value entry with '/'cuser'@'cnode'('otime')'
CALL TELLNJE cuser 'AT' cnode '-> New user joined: 'userid' @ 'node
end
return
CheckTimeout:
/* Check if user has not sent any message, automatic LOGOFF */
arg ctime
cj=0 /* save logons to remove, else logon buffer doesn't match */
do ci=1 to words($.@)
entry=word($.@,ci)
if entry='' then iterate
parse value entry with '/'cuser'@'cnode'('otime')'
/* say cuser cnode ctime otime ctime-otime */
if ctime-otime> maxdormant then do /* timeout per configuration */
cj=cj+1
say 'removed user: 'cnode
$remove.cj=cuser','cnode
end
end
do ci=1 to cj
interpret 'call logoffuser '$remove.ci
call log($remove.ci||'logged off due to timeout reached '||maxdormant|| ' minutes')
loggedonusers = loggedonusers -1
end
return
refreshTime:
/* Refresh last transaction time */
/*trace i */
arg ctime,userid,node
listuser=userid'@'node
ppos=pos('/'listuser,$.@)
if ppos=0 then return /* user not logged on */
ppos=pos('(',$.@,ppos+1) /* find timestamp */
if ppos=0 then return /* not found, let it be */
rpos=pos(')',$.@,ppos+1)+1 /* find end of timestamp */
if rpos=0 then return /* ) not found, let it be */
rlen=rpos-ppos
$.@=overlay('('ctime')',$.@,ppos,rlen)
return
exTime:
/* Calculate Seconds in this year */
dd=(date('d')-1)*86400
parse value time() with hh':'mm':'ss
tt=hh*3600+mm*60+ss
return right(dd+tt,8,'0')
mytime: procedure
/* show human readable time and date */
timenow = left(time(),5)
hr = left(timenow,2)
min = right(timenow,2)
if hr > 12 then timenow = (hr - 12)'.'min' pm'
else if hr = 12 then timenow = hr'.'min' pm'
else timenow = hr'.'min' am'
if left(timenow,1) = '0' then timenow = substr(timenow,2)
dow = left(date('weekday'),3)
day = right(date('sorted'),2)
if left(day,1) = '0' then day = substr(day,2)
month = left(date('month'),3)
year = left(date('sorted'),4)
return timenow',' dow day month year
/* below the double linked list constructs */
p: return word(arg(1), 1) /*pick the first word out of many items*/
sy: say;
say left('', 30) " " arg(1) ' ';
return
@init: $.@=;
@adjust: $.@=space($.@);
$.#=words($.@);
return
@hasopt: arg o;
return pos(o, opt)\==0
@size: return $.#
/* */
@del: procedure expose $.;
arg k,m;
call @parms 'km'
_=subword($.@, k, k-1) subword($.@, k+m)
$.@=_;
call @adjust;
return
@get: procedure expose $.; arg k,m,dir,_
call @parms 'kmd'
do j=k for m by dir while j>0 & j<=$.#
_=_ subword($.@, j, 1)
end /*j*/
return strip(_)
@parms: arg opt /*define a variable based on an option.*/
if @hasopt('k') then k=min($.#+1, max(1, p(k 1)))
if @hasopt('m') then m=p(m 1)
if @hasopt('d') then dir=p(dir 1);
return
@put: procedure expose $.;
parse arg x,k;
k=p(k $.#+1);
call @parms 'k'
$.@=subword($.@, 1, max(0, k-1)) x subword($.@, k);
call @adjust
return
@show: procedure expose $.;
parse arg k,m,dir;
if dir==-1 & k=='' then k=$.#
m=p(m $.#);
call @parms 'kmd';
say @get(k,m, dir);
return
list:
/* this is only as examples how to use the double linked list
for future expanesion of this program */
call sy 'initializing the list.' ; call @init
call sy 'building list: blue' ; call @put "blue"
call sy 'displaying list size.' ; say "list size="@size()
call sy 'forward list' ; call @show
call sy 'backward list' ; call @show ,,-1
call sy 'showing 4th item' ; call @show 4,1
call sy 'showing 5th & 6th items' ; call @show 5,2
call sy 'adding item before item 4: black' ; call @put "black",4
call sy 'showing list' ; call @show
call sy 'adding to tail: white' ; call @put "white"
call sy 'showing list' ; call @show
call sy 'adding to head: red' ; call @put "red",0
call sy 'showing list' ; call @show
return
log:
/* log a line to relay machine and/or log */
parse ARG logline
say mytime()' :: 'logline
return
highrate:
/* when too many incoming messages per second exit server to avoid CPU overloading */
/* this function detects high msg rate for loop detection purposes
or for system load abatement purposes */
RATE = 0
parse ARG receivedmsg
currentime=Extime()
elapsedtime=currentime-starttimeSEC
if elapsedtime = 0 then elapsedtime = 3 /* some machines too fast */
rate = receivedmsg/elapsedtime
if rate > raterwatermark then do
call log ('Rate high watermark exceeded, rate: '||rate)
signal xit;
end
else do
return 0
end
return
errorhandler:
/* check for typical errors which lead to msg loops */
parse ARG msg /* what error are we checking for/ */
if (msg = returnNJEmsg) | (msg = returnNJEmsg2) | (msg = returnNJEmsg3) | ,
(msg = returnNJEmsg4) | (msg= returnNJEmsg5) then return 1
else return 0
return