manlio_perillo:
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.
It would be something like: withTempFile :: FilePath -> String -> ((FilePath,Handle) -> IO r) -> IO r withTempFile name tmp = bracket (openTempFile name tmp) (\(f,h) -> hClose h >> removeFile f) -- Don