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POperl fork doesn't work properly when run remotely (via ssh)
 

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  1. POperl fork doesn't work properly when run remotely (via ssh)
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    <p>I have a perl script, script.pl which, when run, does a fork, the parent process outputs its pid to a file then exits while the child process outputs something to STOUT and then goes into a while loop.</p> <pre><code>$pid = fork(); if ( ! defined $pid ) { die "Failed to fork."; } #Parent process elsif($pid) { if(!open (PID, "&gt;&gt;running_PIDs")) { warn "Error opening file to append PID"; } print PID "$pid \n"; close PID; } #child process else { print "Output started"; while($loopControl) { #Do some stuff } } </code></pre> <p>This works fine when I call it locally ie: perl script.pl.</p> <p>The script prints out some things then returns control back to the shell. (while the child process goes off into its loop in the background).</p> <p>However, when I call this via ssh control is never returned back to the shell (nor is the "Output started" line ever printed.</p> <p>ie: $ ssh username@example.com 'perl script.pl'</p> <p>However, the interesting thing is, the child process does run (I can see it when I type ps). </p> <p>Can anyone explain whats going on?</p> <p>EDIT:</p> <p>I ran it under debug and got this:</p> ### Forked, but do not know how to create a new TTY. <p>Since two debuggers fight for the same TTY, input is severely entangled.</p> <p>I know how to switch the output to a different window in xterms and OS/2 consoles only. For a manual switch, put the name of the created TTY in $DB::fork_TTY, or define a function DB::get_fork_TTY() returning this.</p> <p>On UNIX-like systems one can get the name of a TTY for the given window by typing tty, and disconnect the shell from TTY by sleep 1000000.</p>
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    1. COIf anyone has a solution to this problem other than `screen` (which I don't always have available), I would love to see it.
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