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.\"
.\" Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com>
.\" All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\" notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\" notice, this list of conditions and the following disclaimer in the
.\" documentation and/or other materials provided with the distribution.
.\" 3. The name of the author may not be used to endorse or promote products
.\" derived from this software without specific prior written permission.
.\"
.\" THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
.\" INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
.\" AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
.\" THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
.\" EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
.\" PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
.\" OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
.\" WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
.\" OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
.\" ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
.\"
.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 Lockspool
is useful for a client mail program to attain proper locking.
.Nm Lockspool
obtains a
.Nm username.lock
for the calling user and retains it until stdin is closed or a signal
like SIGINT, SIGTERM, or SIGHUP is received. Additionally, the superuser
may specify the name of a user in order to lock a different mailbox.
.Pp
If
.Nm lockspool
is able to create the lock file, ``1'' is written to stdout, otherwise
``0'' is written and an error message is written to stderr.
.Nm Lockspool
will try up to 10 times to get the lock (sleeping
for a short period in between tries).
.Pp
The
.Nm lockspool
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 HISTORY
The
.Nm lockspool
program appeared in
.Ox 2.4 .
.Sh SEE ALSO
.Xr mail 1 ,
.Xr mail.local 1 ,
.Xr sendmail 8
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