"Andresen,Jason R." wrote:
> Garrett Wollman wrote:
> >
> > <<On Thu, 16 Nov 2000 15:18:09 +0000, void <[EMAIL PROTECTED]> said:
> >
> > > I have a similar problem -- every time I make world, perms on /var/mail
> > > get set to 775. Mutt considers my mailbox read-only until I change it
> > > to 1777.
> >
> > It is misconfigured (or perhaps just broken). 1777 mode for /var/mail
> > is insecure, but was necessary in the mists of ancient past, before
> > UNIX learned to do file locking. Unless your mail spool is shared
> > over NFS (don't do that), locking is reliable and .lock files should
> > never be used or relied upon.
>
> Not the FreeBSD's file locking works anyway.
> Here's the results from a test of the below program:
You test case is incorrect. Following quote from flock(2) explains why:
[...]
NOTES
Locks are on files, not file descriptors. That is, file descriptors du-
plicated through dup(2) or fork(2) do not result in multiple instances of
a lock, but rather multiple references to a single lock. If a process
holding a lock on a file forks and the child explicitly unlocks the file,
the parent will lose its lock.
[...]
-Maxim
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