I don't think the code you show is enough to explain the problem. SSL wants to read first happens if non-blocking sockets are used or if you specify a timeout for the connection. The last case should be handled transparently for the user but in the first case you have to deal with want read first (SSL_WANT_READ) and want write first (SSL_WANT_WRITE) explicitly by waiting for the socket to be readable or writable using select or similar and then re-doing the failed action (read, write, connect_SSL, accept_SSL...) again. There is a part in the documentation of IO::Socket::SSL which deals with non-blocking sockets and describes how the handling differs from non-SSL sockets and what SSL_WANT_READ and SSL_WANT_WRITE mean.

As for the error about Interrupted system call: I think the origin of this must be somewhere in the code you did not show. The strace you show indicates that there happens a SIGCHLD, so an exit of a sub-process might be the cause of this problem. As with SSL_WANT_* you need to continue with the current operation if EINTR happens but this is expected when dealing with non-SSL sockets too.

In reply to Re: IO::Socket::SSL sometimes says 'SSL wants a read first' by noxxi
in thread IO::Socket::SSL sometimes says 'SSL wants a read first' by FloydATC

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.