Provided by: systemtap-doc_3.1-3ubuntu0.1_all 

NAME
function::task_gid - The group identifier of the task
SYNOPSIS
task_gid:long(task:long)
ARGUMENTS
task
task_struct pointer
DESCRIPTION
This function returns the group id of the given task.
SEE ALSO
tapset::task(3stap)
SystemTap Tapset Reference March 2016 FUNCTION::TASK_GID(3stap)