Linux: enabled commander module

The commander module now compiles for Linux.

state_machine_helper_linux.cpp iterates over the virtual devices vs
all devices under /dev as per NuttX when disabling publishing.

Signed-off-by: Mark Charlebois <charlebm@gmail.com>

src/drivers/device/vdev.cpp

@@ -467,5 +467,13 @@ void VDev::showDevices()
 	}
 }
 
+const char *VDev::devList(unsigned int *next)
+{
+	for (;*next<PX4_MAX_DEV; (*next)++)
+		if (devmap[*next])
+			return devmap[(*next)++]->name;
+	return NULL;
+}
+
 } // namespace device
 

src/drivers/device/vdev.h

@@ -334,6 +334,7 @@ public:
 
 	static VDev *getDev(const char *path);
 	static void showDevices(void);
+	static const char *devList(unsigned int *next);
 
 protected:
 

src/drivers/device/vdev_posix.cpp

@@ -274,5 +274,10 @@ void px4_show_devices()
 	VDev::showDevices();
 }
 
+const char * px4_get_device_names(unsigned int *handle)
+{
+	return VDev::devList(handle);
+}
+
 }