It leads me to believe that, if by returning a failure state run_ssh() allows you to assume that the subprocess could not start, that it blocks its return until it has started otherwise.

The docs for run_ssh() further state " boolean: 1 if the ssh ran OK or 0 otherwise. In case of failures, use $! to do get info." Note the tense and order. $! is meaningless unless run_ssh() returned a failure code. It wouldn't return a failure code if the SSH session was started successfully, and doesn't return success until and unless it was started successfully.

$! is absolutely meaningless regarding the success of run_ssh(), as it will not get populated by run_ssh() except on failure.

Why do you seem to think that run_ssh() is run asynchonously and does not block? It's the SSH connection that's supposed to be in a separate process per the docs, not run_ssh() itself.

In reply to Re^4: Problem with Net::SSH::Expect on unavailable hosts by mr_mischief
in thread Problem with Net::SSH::Expect on unavailable hosts by sierpinski

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.