On 2024-02-10 graeme vetterlein via Exim-users <exim-users@???> wrote:
> So, taking jgh@??? URL:
> https://exim.org/exim-html-current/doc/html/spec_html/ch-the_appendfile_transport.html
> I see the text: (I've added **highlights**)
[...]
> use_fcntl_lock Use: appendfile Type: boolean Default: see below
> This option controls the use of the fcntl() function to lock a file for
> exclusive use when a message is being appended. **It is set by default
> unless
> use_flock_lock is set.**
> So this is set by default UNLESS ...one of the other locking options is
> chosen:
> If I do:
> root@ybox:/var/lib/exim4# grep -i use_ /var/lib/exim4/config.autogenerated
[...]
> exim will use "apendfile" to append mail to /var/mail/<myuserid>
> and it will use fcntl(2) (I'm assuming advisory locking?)
ametzler@argenau:~$ /usr/sbin/exim4 -bP transport mail_spool | grep use_fcntl
use_fcntl_lock
> So I (may need to) just ensure maildrop(1) also uses fcntl(2) locking
[...]
> From maildrop:
[...]
> --with-locking-method=name - manually select a locking function call. name
> is either "fcntl", "flock", or "lockf". Otherwise the configuration
> script will pick one by itself.
[...]
Looking at
https://salsa.debian.org/debian/maildrop/-/blob/master/debian/rules?ref_type=heads
we find:
--with-locking-method=fcntl
cu Andreas
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