error situation handling when starting app from a script
Hi,
in my bash script I start 3rd party app that runs quickly normally and returns some data that I use later for processing. However if there are problems the app doesn't return anything and just hangs... then my script also hangs of course, awaiting for the app to comeback. Was wondering how to avoid that so the script could carry on or at least bailout with an error if that happens. Is there a way to do it in bash ?
Code:
get_proc_stats() {
port=$1
tstats=`app $port`
}
I was thinking maybe I could start/fork seperate process in background which would then check the main process somehow, maybe sending a signal USR1 and then the main process would be maybe writing something to some temp. file and forked process runnig in background would be checking if update to temp. file happend, if not then it could wait some time and kill the main process ?
What do you think?
Any hints on that appreciated,
Cheers,
Tomasz
Moderator's Comments:
Please use code tags next time for your code and data.
Last edited by zaxxon; 09-05-2012 at 10:54 AM..
Reason: code tags
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LEARN ABOUT DEBIAN
plack::runner
Plack::Runner(3pm) User Contributed Perl Documentation Plack::Runner(3pm)NAME
Plack::Runner - plackup core
SYNOPSIS
# Your bootstrap script
use Plack::Runner;
my $app = sub { ... };
my $runner = Plack::Runner->new;
$runner->parse_options(@ARGV);
$runner->run($app);
DESCRIPTION
Plack::Runner is the core of plackup runner script. You can create your own frontend to run your application or framework, munge command
line options and pass that to "run" method of this class.
"run" method does exactly the same thing as the plackup script does, but one notable addition is that you can pass a PSGI application code
reference directly to the method, rather than via ".psgi" file path or with "-e" switch. This would be useful if you want to make an
installable PSGI application.
Also, when "-h" or "--help" switch is passed, the usage text is automatically extracted from your own script using Pod::Usage.
NOTES
Do not directly call this module from your ".psgi", since that makes your PSGI application unnecessarily depend on plackup and won't run
other backends like Plack::Handler::Apache2 or mod_psgi.
If you really want to make your ".psgi" runnable as a standalone script, you can do this:
my $app = sub { ... };
unless (caller) {
require Plack::Runner;
my $runner = Plack::Runner->new;
$runner->parse_options(@ARGV);
return $runner->run($app);
}
return $app;
WARNING: this section used to recommend "if (__FILE__ eq $0)" but it's known to be broken since Plack 0.9971, since $0 is now always set to
the .psgi file path even when you run it from plackup.
SEE ALSO
plackup
perl v5.14.2 2012-03-21 Plack::Runner(3pm)
09-05-2012
