On Thu, 13 Mar 1997 16:41:00 PST Bruce Perens (firstname.lastname@example.org) wrote:
> You could leave the flock locking on and surround it with dot-locking.
> To perform dot-locking, create the file <mailbox-name>.lock using
> open(name, O_CREAT|O_EXCL, 0644). Create with O_EXCL will fail if the
> file exists. If you can't create it, sleep for a while and try again.
> To unlock, unlink() the file.
I thought this was the wrong thing to do, as open() is not garanteed atomic across NFS.
>From what I understood, one should:
open(dummy_name_with_pid_and_machine_name_included, O_CREAT|O_EXCL, 0600);
as link() is guaranteed atomic across NFS.
Can someone tell which is better ?