HelenOS sources

CONTROL_FS       1007 uspace/drv/nic/rtl8169/driver.c 		if (descr->control & CONTROL_FS)
CONTROL_FS       1127 uspace/drv/nic/rtl8169/driver.c 	descr->control = CONTROL_OWN | CONTROL_FS | CONTROL_LS;
HelenOS homepage, sources at GitHub