---
name: "SDL_SetEnvironmentVariable"
section: "3"
platform: "linux"
package: "libsdl3-doc"
version: "3.2.10+ds-1"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/SDL_SetEnvironmentVariable"
---

# SDL\_SetEnvironmentVariable(3)

Set the value of a variable in the environment.

## NAME

SDL\_SetEnvironmentVariable - Set the value of a variable in the environment.

## HEADER FILE

Defined in SDL3/SDL\_stdinc.h

## SYNOPSIS

```
#include "SDL3/SDL.h"
```

**bool SDL\_SetEnvironmentVariable(SDL\_Environment \*env, const char \*name, const char \*value, bool overwrite);**

## FUNCTION PARAMETERS

- *env*

  the environment to modify.

- *name*

  the name of the variable to set.

- *value*

  the value of the variable to set.

- *overwrite*

  true to overwrite the variable if it exists, false to return success without setting the variable if it already exists.

## RETURN VALUE

Returns true on success or false on failure; call

**SDL\_GetError** () for more information.

## THREAD SAFETY

It is safe to call this function from any thread.

## AVAILABILITY

This function is available since SDL 3.2.0.

## SEE ALSO

**•**(3), [**SDL\_GetEnvironment**(3)](/SDL_GetEnvironment/3.md), **•**(3), [**SDL\_CreateEnvironment**(3)](/SDL_CreateEnvironment/3.md), **•**(3), [**SDL\_GetEnvironmentVariable**(3)](/SDL_GetEnvironmentVariable/3.md), **•**(3), [**SDL\_GetEnvironmentVariables**(3)](/SDL_GetEnvironmentVariables/3.md), **•**(3), [**SDL\_UnsetEnvironmentVariable**(3)](/SDL_UnsetEnvironmentVariable/3.md)