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
POSIX::setsid() .
Portability issues: setpgrp in perlport.