Hi. After reading the chapter about IO in the "Real Word Haskell" book, I have noted that there is no support for opening a temporary file that will be automatically removed at program termination. The Python tempfile module, as an example, implements a wrapper around mkstemp function that does exactly this, and the code is portable; on Windows it uses O_TEMPORARY_FILE flag, on POSIX systems the file is unlink-ed as soon as it is created (but note that the code is not signal safe - well, many functions in the Python standard library are not signal safe). There are reasons why GHC library does not implement this? The Python version also set the FD_CLOEXEC, O_NOINHERIT and O_NOFOLLOW flags (where available). The GHC version, instead, set the O_NOCTTY flag. Manlio Perillo