Sets the current process group for the specified PID,0 for the current process. Will produce a fatal error if used on a machine that doesn't implement POSIX setpgid(2) or BSD setpgrp(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().
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