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- .\" Copyright (c) 1995
- .\" The Regents of the University of California. All rights reserved.
- .\"
- .\" This code is derived from software developed by the Computer Systems
- .\" Engineering group at Lawrence Berkeley Laboratory under DARPA contract
- .\" BG 91-66 and contributed to Berkeley.
- .\"
- .\" 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. All advertising materials mentioning features or use of this software
- .\" must display the following acknowledgement:
- .\" This product includes software developed by the University of
- .\" California, Berkeley and its contributors.
- .\" 4. Neither the name of the University nor the names of its contributors
- .\" may be used to endorse or promote products derived from this software
- .\" without specific prior written permission.
- .\"
- .\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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 December 14, 1995
- .Dt LOGIN 3
- .Os
- .Sh NAME
- .Nm login ,
- .Nm logout ,
- .Nm logwtmp
- .Nd login utility functions
- .Sh SYNOPSIS
- .Fd #include <util.h>
- .Ft void
- .Fn login "struct utmp *ut"
- .Ft int
- .Fn logout "const char *line"
- .Ft void
- .Fn logwtmp "const char *line" "const char *name" "const char *host"
- .Sh DESCRIPTION
- The
- .Fn login ,
- .Fn logout ,
- and
- .Fn logwtmp
- functions operate on the database of current users in
- .Pa /var/run/utmp
- and on the logfile
- .Pa /var/log/wtmp
- of logins and logouts.
- .Pp
- The
- .Fn login
- function updates the
- .Pa /var/run/utmp
- and
- .Pa /var/log/wtmp
- files with user information contained in
- .Fa ut .
- .Pp
- The
- .Fn logout
- function removes the entry from
- .Pa /var/run/utmp
- corresponding to the device
- .Fa line .
- .Pp
- The
- .Fn logwtmp
- function adds an entry to
- .Pa /var/log/wtmp .
- Since
- .Fn login
- will add the appropriate entry for
- .Pa /var/log/wtmp
- during a login,
- .Fn logwtmp
- is usually used for logouts.
- .Sh RETURN VALUES
- .Fn logout
- returns non-zero if it was able to find and delete an entry for
- .Fa line ,
- and zero if there is no entry for
- .Fa line
- in
- .Pa /var/run/utmp .
- .Sh FILES
- .Bl -tag -width /var/run/wtmp -compact
- .It Pa /dev/\(**
- .It Pa /etc/ttys
- .It Pa /var/run/utmp
- .It Pa /var/log/wtmp
- .El
- .Sh SEE ALSO
- .Xr utmp 5
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