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 POSIXsetpgid(2) or BSDsetpgrp(2). If the arguments are omitted, it defaults to0,0. Note that the BSD 4.2 version ofsetpgrp does not accept any arguments, so onlysetpgrp(0,0) is portable. See alsoPOSIX::setsid().
Portability issues:"setpgrp" in perlport.
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