Greetings monks,
 
This is a followup on my earlier query: syswrite and closed sockets. Although the excellent guide by fellow monks solved many of the problems, however I hit upon one more issue and request your insights.
 
I have the following piece of code, which uses IO::Socket::INET to open a blocking socket against a messaging server and attempts to write a text: 
use IO::Socket::INET;
use Carp;

my $socket = IO::Socket::INET->new(
                                     PeerAddr=> $host,
                                     PeerPort=> $port,
                                     Proto=> "tcp",
                                     Blocking => 1 ) ;

for(1..100){
    print $_ . "..";
    sleep(2);

    eval{
      $output = $socket->syswrite($string);
    };

    croak "Could not syswrite: $@\n" if(!$output or $@);


    print "done\n";
}

[download]
 
While this code is running, I shutdown the message service. This causes the script to exit, after a couple of iteration. I was expecting to see the croak message, however the script just exits.
 
I tried to execute this script via Komodo IDE, and in the IDE output window I could see the croak message. Besides if I modified the error handling part to, lets say, write a message to a file and follow the process:
  • via a shell: no output and nor the file is being created
  • via Komodo: I see the croak message and the file is being created
 
My questions:
  • What is causing this behaviour ?
  • if syswrite does a exit, how can I handle it in a OO context ? (I know we can handle exits via WIFEXITED, but only if executed as a child process)

In reply to syswrite, closed socket and error handling by InfiniteLoop

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