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# PR_UnloadLibrary
Unloads a library loaded with {ref}`PR_LoadLibrary`.
## Syntax
```{code}
#include <prlink.h>
PRStatus PR_UnloadLibrary(PRLibrary *lib);
```
### Parameters
The function has this parameter:
`lib`
: A reference previously returned from {ref}`PR_LoadLibrary`.
### Returns
The function returns one of the following values:
- If successful, `PR_SUCCESS`.
- If unsuccessful, `PR_FAILURE`. Use {ref}`PR_GetError` to find the
reason for the failure.
## Description
This function undoes the effect of a {ref}`PR_LoadLibrary`. After calling
this function, future references to the library using its identity as
returned by {ref}`PR_LoadLibrary` will be invalid.