207  * handle:	0-based id of the device
211 int ub_dev_open(int handle)  in ub_dev_open()  argument
216 	if (handle < 0 || handle >= UB_MAX_DEV)  in ub_dev_open()
219 	di = &devices[handle];  in ub_dev_open()
227 int ub_dev_close(int handle)  in ub_dev_close()  argument
231 	if (handle < 0 || handle >= UB_MAX_DEV)  in ub_dev_close()
234 	di = &devices[handle];  in ub_dev_close()
245  * - have sane handle
250 static int dev_valid(int handle)  in dev_valid()  argument
252 	if (handle < 0 || handle >= UB_MAX_DEV)  in dev_valid()
255 	if (devices[handle].state != DEV_STA_OPEN)  in dev_valid()
261 static int dev_stor_valid(int handle)  in dev_stor_valid()  argument
263 	if (!dev_valid(handle))  in dev_stor_valid()
266 	if (!(devices[handle].type & DEV_TYP_STOR))  in dev_stor_valid()
272 int ub_dev_read(int handle, void *buf, lbasize_t len, lbastart_t start,  in ub_dev_read()  argument
279 	if (!dev_stor_valid(handle))  in ub_dev_read()
282 	di = &devices[handle];  in ub_dev_read()
292 static int dev_net_valid(int handle)  in dev_net_valid()  argument
294 	if (!dev_valid(handle))  in dev_net_valid()
297 	if (devices[handle].type != DEV_TYP_NET)  in dev_net_valid()
303 int ub_dev_recv(int handle, void *buf, int len, int *rlen)  in ub_dev_recv()  argument
308 	if (!dev_net_valid(handle))  in ub_dev_recv()
311 	di = &devices[handle];  in ub_dev_recv()
321 int ub_dev_send(int handle, void *buf, int len)  in ub_dev_send()  argument
326 	if (!dev_net_valid(handle))  in ub_dev_send()
329 	di = &devices[handle];  in ub_dev_send()