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gid_t getgid(void);
gid_t getegid(void);
getgid returns the real gid of the current task.
getegid returns the effective gid of the current task. The real gid
is the gid of the user that started the task, the effective gid, on the other
hand, is the gid of the executable file if the sgid bit is set.
getgid: the real gid.
getegid: the effective gid.