Addition & Thanks : catch exit code!

[Davide Frisoni]

Hello everyone,
thanks to all people who answered my question, the main error come from a wrong use of [].

I wrote :
set code [catch [my_cprogram] err] :-(
and now with :
set code [catch {my_cprogram} err] :-)
it works.

But the real problem now, is that my_cprogram write some messages into the stderror
and catch recognize them as error and report me the first-one with code=1 (my exit_code=0).
I "changed" the stderr in stdout and all goes well (right exit code, err=""), but I've
"lost" my messages (probably stdout has been redirected into null device).
What should I do? I've to redirect my stdout in a file?

Thanks in advance,
--
--FRY

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[Frank Stajano]

In article <2vte0b$7...@wega.rz.uni-ulm.de>, fri...@faw.uni-ulm.de (Davide Frisoni) writes:
|> Hello everyone,
|> thanks to all people who answered my question, the main error come from a wrong use of [].
|>
|> I wrote :
|> set code [catch [my_cprogram] err] :-(
|> and now with :
|> set code [catch {my_cprogram} err] :-)
|> it works.
|>
|> But the real problem now, is that my_cprogram write some messages into the stderror
|> and catch recognize them as error and report me the first-one with code=1 (my exit_code=0).
|> I "changed" the stderr in stdout and all goes well (right exit code, err=""), but I've
|> "lost" my messages (probably stdout has been redirected into null device).
|> What should I do? I've to redirect my stdout in a file?

Use "exec my_cprogram" instead of "my_cprogram". First, it will work from within
a script (whereas without exec it only works interactively). Second, the return
value from exec will be whatever your program wrote to its output. The exec man
page is more specific on all the many wonderful tricks you can play, including
supplying your own stdin to the program from within a tcl variable.

--

Frank (Filologo Disneyano)