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+.\" Copyright (C) 2003 International Business Machines Corp.
+.\" This file is distributed according to the GNU General Public License.
+.\" See the file COPYING in the top level source directory for details.
+.\" 
+.de Sh \" Subsection
+.br
+.if t .Sp
+.ne 5
+.PP
+\fB\\$1\fR
+.PP
+..
+.de Sp \" Vertical space (when we can't use .PP)
+.if t .sp .5v
+.if n .sp
+..
+.de Ip \" List item
+.br
+.ie \\n(.$>=3 .ne \\$3
+.el .ne 3
+.IP "\\$1" \\$2
+..
+.TH "PAM_NOLOGIN" 8 "2003-03-21" "Linux 2.4" "System Administrator's Manual"
+.SH NAME
+pam_nologin \- Disables login for all except root when 
+\fI/etc/nologin\fR exists
+.SH "SYNOPSIS"
+.ad l
+.hy 0
+
+/lib/security/pam_nologin
+.sp
+.ad
+.hy
+
+.SH "DESCRIPTION"
+
+.PP
+\fBpam_nologin\fR is a PAM module that prevents users from logging 
+into the system when \fI/etc/nologin\fR exists. 
+The contents of the \fI/etc/nologin\fR file are displayed to the user. 
+The \fBpam_nologin\fR module has no effect on the root user's ability to log in.
+
+.SH "OPTIONS"
+
+.PP
+\fBpam_login\fR has no options.
+
+.SH "MODULE SERVICES PROVIDED"
+
+.TP
+auth
+_authentication and _setcred (blank)
+
+.SH "RETURN CODES"
+.PP
+\fBpam_nologin\fR has the following return codes:
+.TP
+PAM_SUCCESS
+Success: either the user is root or the \fI/etc/nologin\fR file does not exist.
+
+.TP
+PAM_SERVICE_ERR
+The module was unable to get the user name.
+
+.TP
+PAM_USER_UNKNOWN
+The module cannot get the UID associated with this user.
+
+.TP
+PAM_AUTH_ERR
+The user is not root and \fI/etc/nologin\fR exists, so the user is 
+not permitted to log in.
+
+.SH "HISTORY"
+
+.PP
+\fBpam_nologin\fR was written by Michael K. Johnson.
+
+.SH "SEE ALSO"
+
+.PP
+\fBpam.conf\fR(8), \fBpam.d\fR(8), \fBpam\fR(8), \fBnologin\fR(8).
+
+.SH AUTHOR
+Emily Ratliff.