Re: Problem with amtape "hanging" when forked from Java

At Thu, 10 Mar 2022 13:11:04 -0500 Nathan Stratton Treadway <[email protected]> wrote:

> 
> On Wed, Mar 09, 2022 at 22:50:29 -0500, Robert Heller wrote:
> > At Wed, 9 Mar 2022 23:50:45 +0100 Exuvo <[email protected]> wrote:
> > 
> > > 
> > > Could you give the exact command line you give when it hangs?
> > 
> > /usr/sbin/amtape -otpchanger=vault_changer wendellfreelibrary label wendellfreelibrary_vault-030
> > 
> 
> What does this command say/do when run from the command line (for a tape
> that causes a hang in the context of your Java program)?

It prints an error message and returns an error status:

backup@newserver:~$ amtape -otpchanger=vault_changer -ointeractivity='' wendellfreelibrary label wendellfreelibrary-vault-030
ERROR: Source Volume 'wendellfreelibrary-vault-030' not found

(and does not hang)


It actually does the same when forked from a Tcl program:

backup@newserver:~$ tclsh
% catch {exec  amtape -otpchanger=vault_changer -ointeractivity= wendellfreelibrary label wendellfreelibrary-vault-030} result
1
% set result
ERROR: Source Volume 'wendellfreelibrary-vault-030' not found
%

(I think the "''" for interactivity is only needed from the shell -- from both 
Tcl and Java, those quote marks need to be ommited or else amtape is looking 
for an interactivity named "''", rather then an null interactivity.)

I'm *guessing* that the Java Process created by exec() wants to deal with the 
printout, but can't.

> 
> 
> 							Nathan
> 
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