Perl 5 version 12.3 documentation
- getpgrp PID
Returns the current process group for the specified PID. Use a PID of
0to 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
getpgrpdoes not accept a PID argument, so only
PID==0is truly portable.