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.\"
.\" Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com>
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.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 1 ,
.Xr sendmail 8
.Sh HISTORY
The
.Nm
program appeared in
.Ox 2.4 .