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+'\" t
+.\"     Title: pam_chauthtok
+.\"    Author: [FIXME: author] [see http://docbook.sf.net/el/author]
+.\" Generator: DocBook XSL Stylesheets v1.78.1 <http://docbook.sf.net/>
+.\"      Date: 05/18/2017
+.\"    Manual: Linux-PAM Manual
+.\"    Source: Linux-PAM Manual
+.\"  Language: English
+.\"
+.TH "PAM_CHAUTHTOK" "3" "05/18/2017" "Linux-PAM Manual" "Linux-PAM Manual"
+.\" -----------------------------------------------------------------
+.\" * Define some portability stuff
+.\" -----------------------------------------------------------------
+.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+.\" http://bugs.debian.org/507673
+.\" http://lists.gnu.org/archive/html/groff/2009-02/msg00013.html
+.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+.ie \n(.g .ds Aq \(aq
+.el       .ds Aq '
+.\" -----------------------------------------------------------------
+.\" * set default formatting
+.\" -----------------------------------------------------------------
+.\" disable hyphenation
+.nh
+.\" disable justification (adjust text to left margin only)
+.ad l
+.\" -----------------------------------------------------------------
+.\" * MAIN CONTENT STARTS HERE *
+.\" -----------------------------------------------------------------
+.SH "NAME"
+pam_chauthtok \- updating authentication tokens
+.SH "SYNOPSIS"
+.sp
+.ft B
+.nf
+#include <security/pam_appl\&.h>
+.fi
+.ft
+.HP \w'int\ pam_chauthtok('u
+.BI "int pam_chauthtok(pam_handle_t\ *" "pamh" ", int\ " "flags" ");"
+.SH "DESCRIPTION"
+.PP
+The
+\fBpam_chauthtok\fR
+function is used to change the authentication token for a given user (as indicated by the state associated with the handle
+\fIpamh\fR)\&.
+.PP
+The
+\fIpamh\fR
+argument is an authentication handle obtained by a prior call to pam_start()\&. The flags argument is the binary or of zero or more of the following values:
+.PP
+PAM_SILENT
+.RS 4
+Do not emit any messages\&.
+.RE
+.PP
+PAM_CHANGE_EXPIRED_AUTHTOK
+.RS 4
+This argument indicates to the modules that the user\*(Aqs authentication token (password) should only be changed if it has expired\&. If this argument is not passed, the application requires that all authentication tokens are to be changed\&.
+.RE
+.SH "RETURN VALUES"
+.PP
+PAM_AUTHTOK_ERR
+.RS 4
+A module was unable to obtain the new authentication token\&.
+.RE
+.PP
+PAM_AUTHTOK_RECOVERY_ERR
+.RS 4
+A module was unable to obtain the old authentication token\&.
+.RE
+.PP
+PAM_AUTHTOK_LOCK_BUSY
+.RS 4
+One or more of the modules was unable to change the authentication token since it is currently locked\&.
+.RE
+.PP
+PAM_AUTHTOK_DISABLE_AGING
+.RS 4
+Authentication token aging has been disabled for at least one of the modules\&.
+.RE
+.PP
+PAM_PERM_DENIED
+.RS 4
+Permission denied\&.
+.RE
+.PP
+PAM_SUCCESS
+.RS 4
+The authentication token was successfully updated\&.
+.RE
+.PP
+PAM_TRY_AGAIN
+.RS 4
+Not all of the modules were in a position to update the authentication token(s)\&. In such a case none of the user\*(Aqs authentication tokens are updated\&.
+.RE
+.PP
+PAM_USER_UNKNOWN
+.RS 4
+User unknown to password service\&.
+.RE
+.SH "SEE ALSO"
+.PP
+\fBpam_start\fR(3),
+\fBpam_authenticate\fR(3),
+\fBpam_setcred\fR(3),
+\fBpam_get_item\fR(3),
+\fBpam_strerror\fR(3),
+\fBpam\fR(8)