Firstly, thanks for the reply. So did I understood this right, that in case that the signal_num isn't equal to 0 coredump is having a value too and the child died unexpected?
But I'm still asking myself, why I have to check this on the bitwise-operand way with if ($? & 127)?
Here some sample code:
my $pid = fork( );
if ( defined $pid && $pid == 0 )
system( $_->arg );
if ($? == -1)
return "failed to execute: $!\n";
elsif ($? & 127)
return "child died with signal %d, %s coredump\n", ($?
+ & 127), ($? & 128) ? 'with' : 'without';
return "child exited with value " . $? >> 8;
Are you posting in the right place? Check out Where do I post X? to know for sure.
Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:
<code> <a> <b> <big>
<blockquote> <br /> <dd>
<dl> <dt> <em> <font>
<h1> <h2> <h3> <h4>
<h5> <h6> <hr /> <i>
<li> <nbsp> <ol> <p>
<small> <strike> <strong>
<sub> <sup> <table>
<td> <th> <tr> <tt>
Snippets of code should be wrapped in
<code> tags not
<pre> tags. In fact, <pre>
tags should generally be avoided. If they must
be used, extreme care should be
taken to ensure that their contents do not
have long lines (<70 chars), in order to prevent
horizontal scrolling (and possible janitor
Want more info? How to link or
or How to display code and escape characters
are good places to start.