Function: group-gid
group-gid is a function defined in editfns.c.
Signature
(group-gid)
Documentation
Return the effective gid of Emacs, as an integer.
Probably introduced at or before Emacs version 24.4.
Source Code
// Defined in /usr/src/emacs/src/editfns.c
{
gid_t egid = getegid ();
return INT_TO_INTEGER (egid);
}