void hw_TmpNam(STRPTR buf);
Before Hollywood 6.0, hw_TmpNam() only returned a file name and didn't actually create
it. Since 6.0 the file is created now to prevent other applications from trying to
use a temporary file of the same name.
Note that on AmigaOS and compatibles this function might create a temporary filename in RAM. If you don't want this because you need to write large portions of data to the file, use the new hw_TmpNamExt() function. See hw_TmpNamExt for details.
Please note that this function is potentially dangerous because it doesn't allow you to pass the size of the buffer. This is why you should use hw_TmpNamNew() instead.
This function is thread-safe.