Perl5 リファレンス



       getpgrp PID
               Returns the current process group for the
               specified PID.  Use a PID of `0' to get the
               current process group for the current process.
               Will raise an exception if used on a machine that
               doesn't implement getpgrp(2).  If PID is omitted,
               returns process group of current process.  Note
               that the POSIX version of `getpgrp' does not
               accept a PID argument, so only `PID==0' is truly
               portable.



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