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Your code appears to work here (ubuntu linux, perl 5.8.8).

This is using backticks (not a system call, as you have in your code. All I did was to replace the extApp $_ with sleep 5.

Can you give some info on your platform and perl version please, and also let us know what the following script prints on your system?

#!/usr/bin/perl use strict; use warnings; my @result; $SIG{ALRM} = sub { print "ALARM fired\n"; die "timeout"; }; eval { alarm(3); @result = `sleep 5`; alarm(0); }; print "Running after alarm: $@\n"; if ($@) { if ($@ =~ /timeout/i) { push @result, "App has hanged itself\n"; } else { alarm(0); # clear the still-pending alarm die; # propagate unexpected exception } } print "result is: ", join('', @result), "\n";
I get:
ALARM fired Running after alarm: timeout at tt.pl line 8. result is: App has hanged itself
On a side note, when you propagate the 'die' error, it's best to re-throw the original die object/text with die $@ to give higher-level code a chance of working out what went wrong.

In reply to Re: Backticks and SIGALRM by jbert
in thread Backticks and SIGALRM by nemo

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