Sets the current process group for the specified PID,
0 for the current process. Raises an exception when used on a machine that doesn't implement POSIX setpgid(2) or BSD setpgrp(2). If the arguments are omitted, it defaults to
0,0 . Note that the BSD 4.2 version of
setpgrp does not accept any arguments, so only
setpgrp(0,0) is portable. See also
Portability issues: setpgrp in perlport.
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