fsetown
return fsetown(&log_pgid, com, data);
return fsetown(&pipe->pipe_pgid, cmd, data);
error = fsetown(&so->so_pgid, cmd, data);
error = fsetown(&d->bd_pgid, cmd, addr);
return fsetown(&sc->sc_pgid, cmd, data);
error = fsetown(&tp->tun_pgid, cmd, data);
int fsetown(pid_t *, u_long, const void *);