[% setvar title wait() and waitpid() should return false on failure %]
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<a name='TITLE'></a><h1>TITLE</h1>
<p>wait() and waitpid() should return false on failure</p>
<a name='VERSION'></a><h1>VERSION</h1>
<pre>  Maintainer: Nathan Torkington &lt;<a href='mailto:gnat@frii.com'>gnat@frii.com</a>&gt;
  Date: 13 Sep 2000
  Mailing List: <a href='mailto:perl6-language@perl.org'>perl6-language@perl.org</a>
  Number: 220
  Version: 1
  Status: Developing</pre>
<a name='ABSTRACT'></a><h1>ABSTRACT</h1>
<p>All system calls in Perl should return false on failure.</p>
<a name='DESCRIPTION'></a><h1>DESCRIPTION</h1>
<p>wait() and waitpid() return -1 on failure.  They should
return <code>undef</code>, and return <code>&quot;0 but true&quot;</code> if the system call
returned 0.</p>
<a name='IMPLEMENTATION'></a><h1>IMPLEMENTATION</h1>
<p>Straightforward.  The perl526 translator simply wraps the perl6 wait()
and waitpid():</p>
<pre>  do { my $r = waitpid(...); return -1 if !defined $r;
       return 0 if !$r; $r }</pre>
<a name='REFERENCES'></a><h1>REFERENCES</h1>
<p>the perlfunc manpage for information on waitpid() and wait()</p>
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