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From: kyle@xanth.UUCP
Newsgroups: comp.unix.wizards
Subject: Re: How are mailfiles locked under 4.n and System III/V?
Message-ID: <962@xanth.UUCP>
Date: Thu, 14-May-87 19:30:59 EDT
Article-I.D.: xanth.962
Posted: Thu May 14 19:30:59 1987
Date-Received: Sat, 16-May-87 14:48:17 EDT
References: <7384@boring.mcvax.cwi.nl>
Lines: 13

In article <7384@boring.mcvax.cwi.nl>, jack@mcvax.cwi.nl (Jack Jansen) writes:
> How do various unices lock mailfiles?

4.2 BSD uses /usr/spool/mail/USERNAME.lock .  4.3 BSD uses flock(), which is
nice now that flock() actually works.

> (As an aside, I went through the sources of 4.3 sendmail,
> expecting an flock() call or something similar,
> but couldn't find *anything* that resembled locking. What am I
> missing?)

Sendmail doesn't do local mail delivery.  Sendmail invokes /bin/mail to the
the actual message delivery.