Method System.setgid()

Method setgid: int setgid(int gid)
Description: Sets the real group ID, effective group ID and saved group ID to gid . If gid is -1 the uid for "nobody" will be used.
Throws: Throws an error if no "nobody" user when gid is -1.
Returns: Returns the current errno.
Note: This function is not available on all platforms.
See also: getuid() , setuid() , getgid() , seteuid() , geteuid() , setegid() , getegid()