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.IX Title "GDM3.8 8"
.TH GDM3.8 8 2024-01-31 "GNOME 45.0.1-3" "Debian GNU/Linux"
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.nh
.SH NAME
gdm3 \- GNOME Display Manager
.SH SYNOPSIS
.IX Header "SYNOPSIS"
gdm3
.SH DESCRIPTION
.IX Header "DESCRIPTION"
\&\fBgdm3\fR is the equivalent of \fBxdm\fR\|(1x) or \fBwdm\fR\|(1x), but uses the GNOME
libraries to provide a GNOME look-and-feel. It provides the GNOME
equivalent of a "login:" prompt.
.PP
\&\fBgdm3\fR reads \fI/etc/gdm3/daemon.conf\fR for its configuration. For each
local display, gdm starts an X server and runs a minimal GNOME session
including a graphical greeter. If configured so, the main gdm process
also listens for XDMCP requests from remote displays. These requests
can either be direct, causing \fBgdm3\fR to start a session on the remote
display, or indirect, causing a chooser to be opened.
.PP
When managing a display, \fBgdm3\fR attempts to execute
\&\fI/etc/gdm3/Init/\fR\fIdisplay\fR, or \fI/etc/gdm3/Init/Default\fR if that does
not exist. When a user logs in, \fBgdm3\fR first attempts
\&\fI/etc/gdm3/PreSession/\fR\fIdisplay\fR (or \fI/etc/gdm3/PreSession/Default\fR),
and then one of the sessions defined in \fI/usr/share/xsessions\fR. When 
the session has completed, \fBgdm\fR attempts to run
\&\fI/etc/gdm3/PostSession/\fR\fIdisplay\fR, or
\&\fI/etc/gdm3/PostSession/\fR\fIDefault\fR.
.PP
\&\fBgdm3\fR maintains information about the displays it is managing in
\&\fI/var/lib/gdm3\fR. This includes xauth information, so this directory
is not readable to normal users.
.PP
\&\fBgdm3\fR uses PAM to perform authentication using the config file
\&\fI/etc/pam.d/gdm3\fR.
.SH ENVIRONMENT
.IX Header "ENVIRONMENT"
.IP XAUTHORITY 4
.IX Item "XAUTHORITY"
Upon session startup, GDM sets the XAUTHORITY environment variable to a
session-specific file in \fI/run/gdm3\fR.
.Sp
Applications and scripts that assume this file is set to \fI~/.Xauthority\fR
will not work. To access the display you need both DISPLAY and
XAUTHORITY variables.
.SH AUTHOR
.IX Header "AUTHOR"
Martin Kasper Petersen <mkp@SunSITE.auc.dk>
.PP
This manual page written by Steve Haslam <araqnid@debian.org> for
Debian GNU/Linux. Updated by Raphaël Hertzog <hertzog@debian.org>,
Ryan Murray <rmurray@debian.org>, Josselin Mouette <joss@debian.org> and 
Vincent Lefevre <vincent@vinc17.net>.