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 )
{
# child
system( $_[0]->arg );
if ($? == -1)
{
return "failed to execute: $!\n";
}
elsif ($? & 127)
{
return "child died with signal %d, %s coredump\n", ($?
+ & 127), ($? & 128) ? 'with' : 'without';
}
else
{
return "child exited with value " . $? >> 8;
}
}
else
{
# parent
}
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