Reference
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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