[Haskell-cafe] about System.Posix.Files.fileAccess

[Brandon S. Allbery KF8NH]

On 2009 Jan 15, at 5:57, Manlio Perillo wrote:
> Brandon S. Allbery KF8NH ha scritto:
>> On 2009 Jan 14, at 9:02, Manlio Perillo wrote:
>>> This is of course a personal opinion, but I think the interface of:
>>> fileAccess :: FilePath -> Bool -> Bool -> Bool -> IO Bool
>>> http://haskell.org/ghc/docs/latest/html/libraries/unix/System-Posix-Files.html#v 
>>> :fileAccess
>>>
>>> is not very good.
>> The underlying system call access() is strongly disrecommended, so  
>> it's not really worth a better interface.
>
> I can't see problems with access function.
>
> Of course it is a problem if used incorrectly:
>
> if (access("foo", F_OK) {
>    fd = open("foo", ...)
> }


The problem is there are very few uses of access() which are safe and  
not already covered better by stat() (getFileStatus).

-- 
brandon s. allbery [solaris,freebsd,perl,pugs,haskell] allbery at kf8nh.com
system administrator [openafs,heimdal,too many hats] allbery at ece.cmu.edu
electrical and computer engineering, carnegie mellon university    KF8NH