Milter-greylist

manu@... wrote:
 > Oliver Fromme <olli@...> wrote:
 > 
 > > So, the most portable and easiest way is to use only fcntl()
 > > for locking on all platforms.  No #ifdef required.
 > 
 > And do you have a way to atomicaly open and lock?

No, but I don't think that is necessary anyway.

You only have to be careful if you want to use O_TRUNC at the
same time.  In this case, you must first open the file without
O_TRUNC, then acquire the lock with fcntl(), and if successful,
use ftruncate() on the descriptor.

If fcntl() was not successful, just close the file descriptor
again.  In this case the file won't be touched at all (not even
the mtime or ctime).

Best regards
   Oliver


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