PACKET dosmanagermultiDEFINES providechannel,dosmanager:LET stdarchivechannel
=31,ack=0,secondphaseack=5,falsecode=6,fetchcode=11,savecode=12,existscode=13
,erasecode=14,listcode=15,allcode=17,clearcode=18,reservecode=19,freecode=20,
checkreadcode=22,formatcode=23,logcode=78,quote="""";BOUND STRUCT (TEXT name,
pass)VAR msg;TASK VAR ordertask;INT VAR doschannel;INT VAR fetchsavemodus;
REAL VAR lastaccesstime:=0.0;TASK VAR diskowner:=niltask;TEXT VAR 
savefilename;PROC providechannel(INT CONST channel):doschannel:=channelEND 
PROC providechannel;IF hdversionTHEN providechannel(29)ELSE providechannel(
stdarchivechannel)FI ;PROC dosmanager:dosmanager(doschannel)END PROC 
dosmanager;PROC dosmanager(INT CONST channel):doschannel:=channel;
taskpassword("-");globalmanager(PROC (DATASPACE VAR ,INT CONST ,INT CONST ,
TASK CONST )dosmanager)END PROC dosmanager;PROC dosmanager(DATASPACE VAR ds,
INT CONST ordercode,phase,TASK CONST fromtask):enablestop;ordertask:=fromtask
;msg:=ds;IF NOT (ordertask=diskowner)AND ordercode<>freecodeAND ordercode<>
reservecodeTHEN errorstop("DOS nicht angemeldet")FI ;IF ordertask=diskowner
THEN lastaccesstime:=clock(1)FI ;SELECT ordercodeOF CASE fetchcode:fetchfile
CASE savecode:savefileCASE erasecode:erasefileCASE clearcode:cleardiskCASE 
existscode:existsfileCASE listcode:listdiskCASE allcode:deliverdirectoryCASE 
reservecode:reserveCASE freecode:freeCASE checkreadcode:checkCASE formatcode:
formatCASE logcode:sendlogOTHERWISE errorstop(
"unbekannter Auftrag für Task: "+name(myself))END SELECT .fetchfile:fetch(
dosname(msg.name,readmodus),ds,fetchsavemodus);managerok(ds).check:checkfile(
dosname(msg.name,readmodus));managermessage(expandedname(msg.name,readmodus)+
" ohne Fehler gelesen").format:IF phase=1THEN managerquestion(
"Diskette formatieren")ELSE formatdosdisk(int(msg.name));managerok(ds)FI .
savefile:IF phase=1THEN savefirstphaseELSE savesecondphaseFI .savefirstphase:
savefilename:=dosname(msg.name,writemodus);IF dosfileexists(savefilename)
THEN managerquestion(expandedname(msg.name,writemodus)+
" auf der MS-DOS Disk ueberschreiben")ELSE send(ordertask,secondphaseack,ds)
FI .savesecondphase:IF dosfileexists(savefilename)THEN erasedosfile(
savefilename)FI ;save(savefilename,ds,fetchsavemodus);forget(ds);ds:=nilspace
;managerok(ds).cleardisk:IF phase=1THEN managerquestion("Diskette loeschen")
ELSE cleardosdisk;managerok(ds)FI .erasefile:IF dosfileexists(dosname(msg.
name,readmodus))THEN IF phase=1THEN managerquestion(expandedname(msg.name,
TRUE )+" auf der MS-DOS Disk loeschen")ELSE erasedosfile(dosname(msg.name,
readmodus));managerok(ds)FI ELSE managermessage("die Datei "+expandedname(msg
.name,TRUE )+" gibt es nicht auf der MS-DOS Disk")FI .existsfile:IF 
dosfileexists(dosname(msg.name,readmodus))THEN managerok(ds)ELSE send(
ordertask,falsecode,ds)FI .listdisk:doslist(ds);managerok(ds).sendlog:forget(
ds);ds:=old("logbuch");managerok(ds).deliverdirectory:forget(ds);ds:=nilspace
;BOUND THESAURUS VAR allnames:=ds;allnames:=alldosfiles;managerok(ds).reserve
:IF reserveorfreepermittedTHEN continuechannel(doschannel);diskowner:=
fromtask;fetchsavemodus:=savefetchmode(msg.name);opendosdisk(path(msg.name));
forget("logbuch",quiet);managerok(ds)ELSE errorstop(
"Archivlaufwerk wird von Task """+name(diskowner)+""" benutzt")FI .
reserveorfreepermitted:fromtask=diskownerOR lastaccessmorethanfiveminutesago
OR diskowner=niltaskOR NOT (exists(diskowner)OR station(diskowner)<>station(
myself)).lastaccessmorethanfiveminutesago:abs(lastaccesstime-clock(1))>300.0.
free:IF reserveorfreepermittedTHEN closedosdisk;diskowner:=niltask;break(
quiet);managerok(ds)ELSE managermessage("DOS nicht angemeldet")FI .END PROC 
dosmanager;PROC managerok(DATASPACE VAR ds):send(ordertask,ack,ds);
lastaccesstime:=clock(1).END PROC managerok;TEXT PROC expandedname(TEXT 
CONST name,BOOL CONST status):text(quote+dosname(name,status)+quote,14)END 
PROC expandedname;END PACKET dosmanagermulti;