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watch.e
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1992-09-02
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/* Watch a file by notification
pops up a requester when a file gets modified.
USAGE: watch <file>
EXAMPLE: run >NIL: watch >NIL: s:startup-sequence
needs v37
simply "watches" a file, using the new notification system
of kick2.0. note: does not _prevent_ files from being modified,
just tells you. usefull, for example, if you're installing a new
software package, and you want to know wether the installer
does something funny to your startup-sequence or user-startup.
note that the only way to stop watching is asctually modifying
the file. (or rebooting :-)
*/
OPT OSVERSION=37
MODULE 'dos/notify'
PROC main() /* make sure file is there: else we'll */
DEF nreq:PTR TO notifyrequest,sig,task
IF (FileLength(arg)=-1) OR (arg[0]=0) /* never be notified */
WriteF('file "\s" does not exist\n',arg)
CleanUp(10)
ENDIF
nreq:=New(SIZEOF notifyrequest) /* memory is cleared */
IF nreq=NIL THEN RETURN 20
sig:=AllocSignal(-1) /* we want to be signalled */
IF sig=-1 THEN RETURN 10
task:=FindTask(0)
nreq.name:=arg /* fill in structure */
nreq.flags:=NRF_SEND_SIGNAL
nreq.port:=task /* union port/task */
nreq.signalnum:=sig
IF StartNotify(nreq)
WriteF('Now watching: "\s"\n',arg)
Wait(Shl(1,sig))
EasyRequestArgs(0,[20,0,0,'File "\s" modified!','Damn!'],0,[arg])
EndNotify(nreq)
ELSE
WriteF('Could not watch "\s".\n',arg)
ENDIF
FreeSignal(sig)
ENDPROC