HelenOS sources

IPC_M_USBVIRT_BULK_OUT  283 uspace/lib/usbvirt/src/ipc_dev.c 	case IPC_M_USBVIRT_BULK_OUT:
IPC_M_USBVIRT_BULK_OUT  281 uspace/lib/usbvirt/src/ipc_hc.c 		method = IPC_M_USBVIRT_BULK_OUT;
HelenOS homepage, sources at GitHub