# lv_wayland.h (/api/public/drivers/wayland/lv_wayland_h)
Functions [#functions]
lv_wayland_get_fd [#lv_wayland_get_fd]
Retrieves the file descriptor of the wayland socket
```c title=" " lineNumbers=1
int lv_wayland_get_fd(void)
```
lv_wayland_get_output_count [#lv_wayland_get_output_count]
Get the number of physical outputs (screens) advertised by the compositor
```c title=" " lineNumbers=1
uint8_t lv_wayland_get_output_count(void)
```
**Returns:** `uint8_t` — the number of outputs, 0 if the driver isn't initialized yet
lv_wayland_get_output_name [#lv_wayland_get_output_name]
Get the name of a physical output
```c title=" " lineNumbers=1
const char * lv_wayland_get_output_name(uint8_t output)
```
Parameters
| Name | Type | Description |
| -------- | --------- | ---------------------------------------------------------------------------------------------------------------------- |
| `output` | `uint8_t` | index of the output, `0`..` - 1` |
**Returns:** `const char *` — the connector name, e.g. "HDMI-A-1", or NULL if `output` is out of range. The string is owned by the driver and stays valid until `lv_wayland_deinit`
lv_wayland_get_output_size [#lv_wayland_get_output_size]
Get the size of a physical output
```c title=" " lineNumbers=1
bool lv_wayland_get_output_size(uint8_t output, int32_t *width, int32_t *height)
```
Parameters
| Name | Type | Description |
| -------- | ----------- | ---------------------------------------------------------------------------------------------------------------------- |
| `output` | `uint8_t` | index of the output, `0`..` - 1` |
| `width` | `int32_t *` | pointer to store the width in pixels **May** be `NULL`. |
| `height` | `int32_t *` | pointer to store the height in pixels **May** be `NULL`. |
**Returns:** `bool` — true if the size is known, false if `output` is out of range or the compositor hasn't reported a size yet
lv_wayland_get_display_size [#lv_wayland_get_display_size]
Look up a physical output by name and get its size
```c title=" " lineNumbers=1
int32_t lv_wayland_get_display_size(const char *name, int32_t *width, int32_t *height)
```
Parameters
| Name | Type | Description |
| -------- | -------------- | -------------------------------------------------------- |
| `name` | `const char *` | connector name of the output, e.g. "DSI-1" or "HDMI-A-1" |
| `width` | `int32_t *` | pointer to store the width in pixels **May** be `NULL`. |
| `height` | `int32_t *` | pointer to store the height in pixels **May** be `NULL`. |
**Returns:** `int32_t` — the index of the output, to be passed to `lv_wayland_window_set_physical_display`, or -1 if no output goes by that name
Dependencies [#dependencies]