# PR_GetOSError

Returns the current thread's last set OS-specific error code.

## Syntax

```{code}
#include <prerror.h>

PRInt32 PR_GetOSError(void)
```

### Returns

The value returned is a 32-bit signed number. Its interpretation is left
to the caller.

## Description

Used for platform-specific code that requires the underlying OS error.
For portability, clients should not create dependencies on the values of
OS-specific error codes. However, this information is preserved, along
with a platform neutral error code, on a per thread basis. It is most
useful during development.