https://manpages.ubuntu.com/manpages/questing/de/man2/setpgid.2.html
Ubuntu Manpage: setpgid, getpgid, setpgrp, getpgrp - Prozessgruppe setzen/holen
Prozessgruppe setzen/holen
ubuntumanpagesetpgidgetpgidsetzen
https://manpages.ubuntu.com/manpages/questing/man2/setpgrp.2.html
Ubuntu Manpage: setpgid, getpgid, setpgrp, getpgrp - set/get process group
set/get process group
ubuntumanpagesetpgidgetpgidprocess
https://manpages.ubuntu.com/manpages/resolute/man2/getpgrp.2.html
Ubuntu Manpage: setpgid, getpgid, setpgrp, getpgrp - set/get process group
set/get process group
ubuntumanpagesetpgidgetpgidprocess
https://manpages.ubuntu.com/manpages/questing/man2/getpgid.2.html
Ubuntu Manpage: setpgid, getpgid, setpgrp, getpgrp - set/get process group
set/get process group
ubuntumanpagesetpgidgetpgidprocess
https://www.php.net/manual/es/function.posix-getpgid.php
PHP: posix_getpgid - Manual
Obtener el id del grupo de procesos para un control de trabajo
phpposixgetpgidmanual
https://cygwin.com/pipermail/cygwin/2003-April/095984.html
1.3.20 : getpgid returns pid != -1 when specified pid no longer exists
no longergetpgidreturns