open STDOUT, ">&=1";
xopen \*STDOUT, ">&" . fileno $kid_wtr;

[download]

That is very buggy also:

File descriptor 1 may be closed, which would cause open STDOUT, ">&=1" to fail (not uncommon, for instance, mod_perl2 does that).

If file descriptor 1 is not closed and it is not STDOUT, then it is probably attached to some other unrelated file handler, say FOO. The xclose call will affect both STDOUT and FOO as they share the same file descriptor, breaking any code using FOO on the parent process.

IMO, the right solution would be to change the system 1, $cmd hack to attach to the child process whatever file handlers are at STDIN, STDOUT and STDERR (or NUL: when closed) irrespectively of their file descriptor numbers. I think that can be done on Windows using the CreateProcess function passing the handles inside the STARTUPINFO structure argument.

In reply to Re^2: STDOUT redirects and IPC::Open3 by salva
in thread STDOUT redirects and IPC::Open3 by kennethk

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.