Re: Race conditions, mkstemp (fwd)

[jmb () kryten Atinc COM (Jonathan M. Bresler)]

On Sun, 11 Dec 1994, Casper Dik wrote:

> >     here is the source for mkstemp from csrg.  note the filesystem 
> > must support exclusive file locking atomic to the open() for this to be 
> > helpful.  as is written in the mkstemp() man page.
> >
> >     why wasnt O_TRUNC included.  that would hammer both soft and hard links
>
>
> Because it serves no useful purpose.  A file created with O_EXCL|O_CREAT
> will have 0 lenght.  If the file needs to be truncated (O_TRUNC) it
> already exists, but i that case the open w/ O_CREATE|O_EXCL would fail.
>
> O_CREATE|O_TRUNC|O_EXCL makes no sense.
>
> Casper


        i gotta learn to read the man pages more carefully.  there it si 
at the bottom, in plain view:

        [EEXIST]  O_CREAT and O_EXCL were specified and the file exists.

        sorry for wasting everyone's time.
jmb

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