HelenOS sources

driver_get_function  292 uspace/lib/drv/generic/driver.c 	ddf_fun_t *fun = driver_get_function(funh);
driver_get_function  327 uspace/lib/drv/generic/driver.c 	ddf_fun_t *fun = driver_get_function(funh);
driver_get_function  435 uspace/lib/drv/generic/driver.c 	ddf_fun_t *fun = driver_get_function(handle);
HelenOS homepage, sources at GitHub