Does a parent need to wait on a child killed using SIGKILL?

Yes.
It can wait because it wouldn't know not to.
It must wait to free the resources the OS keeps in case the parent does wait.

(If the parent doesn't wait, the resources will be freed when the parent exits.)

What would happen in case it does wait on such a child that has been killed using SIGKILL?

The zombie would be freed and $? would indicate the cause of death (just as if it had exist successfully, exited with an error or killed by another signal).

In reply to Re: Does a parent need to wait on a child killed using SIGKILL? by ikegami
in thread Does a parent need to wait on a child killed using SIGKILL? by piyush

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.