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<!-- maildrop - mail delivery agent with filtering abilities -->
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<TITLE>dotlock - create mail lock files</TITLE>
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<H1>
dotlock - create lock files</H1>
<BR><BR>
<H2>
SYNOPSIS</H2>
<TT>dotlock [-f] lock-file program [arg] [arg] ...</TT>
<BR><BR>
<H2>
DESCRIPTION</H2>
The <I>dotlock</I> program creates a lock file that's compatible with <I>maildrop</I>,
and other mail software, then runs a program. When the program terminates,
the lock file is removed.
<P>Because a mailbox file can only be accessed by one program at a time,
a lock file must be used by all programs who need to use the mailbox file.
Otherwise, while one program uses a mailbox file, another program can write
to it, resulting a corrupted mailbox. <I>dotlock</I> creates a dot-lock file
by default. Specifying the -f option will create an flock lock instead
(the file is opened, and the flock() system call is used to obtain a lock
on the file).
<P>Please note that you must specify the full name of the lock file, including
the ".lock" extension. Therefore, to lock <TT>/var/spool/mail/user</TT>,
you must specify <TT>/var/spool/mail/user.lock</TT> as the lock file. If
you omit the .lock extension, you'll end up deleting your mail!
<BR><BR>
<H2>
SEE ALSO</H2>
sendmail(8), <A HREF="maildrop.html">maildrop(1)</A>
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