(PHP 4, PHP 5, PHP 7) Get the current sid of the process
(PHP 4, PHP 5, PHP 7) Return info about system resource limits
(PHP 4, PHP 5, PHP 7) Return info about a group by group id
(PHP 4, PHP 5, PHP 7) Determine terminal device name
(PHP 4, PHP 5, PHP 7) Make the current process a session leader
(PHP 4, PHP 5, PHP 7) Send a signal to a process
(PHP 4, PHP 5, PHP 7) Return the effective group ID of the current process
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