Ralf Hemmecke wrote:
>
> I've added two hooks in i-syscmd.boot like this.
>
> display l ==
> ioHook("startSysCmd", "display")
> displaySpad2Cmd l
> ioHook("endSysCmd", "display")
>
> Unfortunately, not in all cases I see the "endSysCmd" token, because for
> certain cases, the diplaSpad2Cmd function does not return, but rather
> thinks that it is wiser to call
>
> terminateSystemCommand() ==
> FRESH_-LINE()
> TOK := 'END_UNIT
> spadThrow()
>
> in order to transfer control.
One possibility is to use code like:
display l ==
ioHook("startSysCmd", "display")
UNWIND_-PROTECT(displaySpad2Cmd l, ioHook("endSysCmd", "display"))
The UNWIND_-PROTECT construct makes sure that second thing is
run even in case of abnomal exit from the first part.
--
Waldek Hebisch
[email protected]
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