Just want to know WNOHANG...
package MyApp;
# I just want to know WNOHANG from sys_wait_h ... [-;
our $WNOHANG_VALUE ||= `$^X -MPOSIX=:sys_wait_h -e "print WNOHANG;"`;
sub WNOHANG () { $WNOHANG_VALUE }
!!'^^';
sigh maybe useful for a long-time running program if you are sensitive to memory usage..