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From: Tomas Hlavaty <tom@logand.com>
To: Jean Louis <bugs@gnu.support>
Cc: Felix Dietrich <felix.dietrich@sperrhaken.name>, help-gnu-emacs@gnu.org
Subject: Re: How I am handling msmtp queues
Date: Mon, 14 Mar 2022 21:51:20 +0100	[thread overview]
Message-ID: <87fsnkxnp3.fsf@logand.com> (raw)
In-Reply-To: <87ilskedxn.fsf@sperrhaken.name>

On Fri 11 Mar 2022 at 15:55, Felix Dietrich <felix.dietrich@sperrhaken.name> wrote:
> Jean Louis <bugs@gnu.support> writes:
>> * Felix Dietrich <felix.dietrich@sperrhaken.name> [2022-03-10 19:33]:
>>> Jean Louis <bugs@gnu.support> writes:
>>>> # wait for a lock that another instance has set
>>>> WAIT=0
>>>> while [ -e "$LOCKFILE" -a "$WAIT" -lt "$MAXWAIT" ]; do
>>>>
>>>> # […]
>>>>
>>>> # lock the $QUEUEDIR
>>>> touch "$LOCKFILE" || exit 1
> I think your lock file handling is not race free.  There are lock file
> helpers that you may find useful.  On Debian, for example:
>
>   $ apt-file find bin/lockfile
>   lockfile-progs: /usr/bin/lockfile-check   
>   lockfile-progs: /usr/bin/lockfile-create
>   lockfile-progs: /usr/bin/lockfile-remove
>   lockfile-progs: /usr/bin/lockfile-touch
>   procmail:       /usr/bin/lockfile

you probably want

   flock

or

   flock -n

see (man "flock")



      parent reply	other threads:[~2022-03-14 20:51 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-03-10  6:23 How I am handling msmtp queues Jean Louis
2022-03-10 16:21 ` Felix Dietrich
2022-03-10 18:51   ` Jean Louis
2022-03-11 14:55     ` Felix Dietrich
2022-03-13 14:54       ` Jean Louis
2022-03-14 20:51       ` Tomas Hlavaty [this message]

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