.\"	$OpenBSD: lockspool.1,v 1.7 2003/06/03 01:52:40 millert Exp $
.\"
.\" Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com>
.\"
.\" Permission to use, copy, modify, and distribute this software for any
.\" purpose with or without fee is hereby granted, provided that the above
.\" copyright notice and this permission notice appear in all copies.
.\"
.\" THE SOFTWARE IS PROVIDED "AS IS" AND TODD C. MILLER DISCLAIMS ALL
.\" WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
.\" OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL TODD C. MILLER BE LIABLE
.\" FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
.\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
.\" OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
.\" CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
.\"
.Dd August 13, 1998
.Dt LOCKSPOOL 1
.Os
.Sh NAME
.Nm lockspool
.Nd lock user's system mailbox
.Sh SYNOPSIS
.Nm lockspool
.Op Ar username
.Sh DESCRIPTION
.Nm
is useful for a client mail program to attain proper locking.
.Nm
obtains a
.Pa username.lock
for the calling user and retains it until stdin is closed or a signal like
.Dv SIGINT ,
.Dv SIGTERM ,
or
.Dv SIGHUP
is received.
Additionally, the superuser may specify the name of a user in order
to lock a different mailbox.
.Pp
If
.Nm
is able to create the lock file,
.Dq 1
is written to stdout, otherwise
.Dq 0
is written and an error message is written to stderr.
.Nm
will try up to 10 times to get the lock (sleeping
for a short period in between tries).
.Pp
The
.Nm
utility exits 0 on success, and 1 if an error occurs.
.Sh FILES
.Bl -tag -width /var/mail/username.lock -compact
.It Pa /var/mail/username.lock
user's mail lock file
.El
.Sh SEE ALSO
.Xr mail 1 ,
.Xr mail.local 8 ,
.Xr sendmail 8
.Sh HISTORY
The
.Nm
program appeared in
.Ox 2.4 .