###### (This is the legacy documentation for SDL2, the previous stable version; [SDL3](https://wiki.libsdl.org/SDL3/) is the current stable version.)
# SDL_LogOutputFunction

The prototype for the log output callback function.

## Header File

Defined in [SDL_log.h](https://github.com/libsdl-org/SDL/blob/SDL2/include/SDL_log.h)

## Syntax

```c
typedef void (SDLCALL *SDL_LogOutputFunction)(void *userdata, int category, SDL_LogPriority priority, const char *message);
```

## Function Parameters

|              |                                                                                          |
| ------------ | ---------------------------------------------------------------------------------------- |
| **userdata** | what was passed as `userdata` to [SDL_LogSetOutputFunction](SDL_LogSetOutputFunction)(). |
| **category** | the category of the message.                                                             |
| **priority** | the priority of the message.                                                             |
| **message**  | the message being output.                                                                |

## Remarks

This function is called by SDL when there is new text to be logged.

----
[CategoryAPI](CategoryAPI), [CategoryAPIDatatype](CategoryAPIDatatype), [CategoryLog](CategoryLog)