http://ftp.x.org/contrib/applications/xscreensaver-3.06.tar.gz

[xscreensaver] / driver / xscreensaver.man

diff --git a/driver/xscreensaver.man b/driver/xscreensaver.man
index 6a031b336fb7b674c3c1c80bda04786222738936..ff978401ea6999d355bc3044fde4c7a6ecee74c0 100644 (file)
--- a/driver/xscreensaver.man
+++ b/driver/xscreensaver.man
@@ -11,7 +11,7 @@
 .if n .sp 1
 .if t .sp .5
 ..
 .if n .sp 1
 .if t .sp .5
 ..

-.TH XScreenSaver 1 "25-Oct-98 (3.02)" "X Version 11"
+.TH XScreenSaver 1 "22-Nov-98 (3.06)" "X Version 11"

 .SH NAME
 xscreensaver - graphics hack and screen locker, launched when the user is idle
 .SH SYNOPSIS
 .SH NAME
 xscreensaver - graphics hack and screen locker, launched when the user is idle
 .SH SYNOPSIS


@@ -914,8 +914,9 @@ without first turning off \fI.Xauthority\fP-based access control, please
 let me know.
 .TP 8
 .B Passwords
 let me know.
 .TP 8
 .B Passwords

-If you get an error message like ``couldn't get password of \fIuser\fP'' 
-then this probably means that you're on a system in which the
+If you get an error message at startup like ``couldn't get password
+of \fIuser\fP'' then this probably means that you're on a system in which 
+the

 .BR getpwent (3)
 library routine can only be effectively used by root.  If this is the case, 
 then \fIxscreensaver\fP must be installed as setuid to root in order for
 .BR getpwent (3)
 library routine can only be effectively used by root.  If this is the case, 
 then \fIxscreensaver\fP must be installed as setuid to root in order for


@@ -934,6 +935,24 @@ xscreensaver-command -restart
 .EE
 to make \fIxscreensaver\fP notice.
 .TP 8
 .EE
 to make \fIxscreensaver\fP notice.
 .TP 8

+.B PAM Passwords
+If your system uses PAM (Pluggable Authentication Modules), then in order
+for xscreensaver to use PAM properly, PAM must be told about xscreensaver.
+The xscreensaver installation process should update the PAM data (on Linux,
+by creating the file \fI/etc/pam.d/xscreensaver\fP for you, and on Solaris, 
+by telling you what lines to add to the \fI/etc/pam.conf\fP file.)  
+
+If the PAM configuration files do not know about xscreensaver, then 
+you \fImight\fP be in a situation where xscreensaver will refuse to ever
+unlock the screen.
+
+This is a design flaw in PAM (there is no way for a client to tell the
+difference between PAM responding ``I have never heard of your module,''
+and responding, ``you typed the wrong password.''  As far as I can tell,
+there is no way for xscreensaver to automatically work around this, or
+detect the problem in advance, so if you have PAM, make sure it is
+configured correctly!
+.TP 8

 .B Colormap lossage: TWM
 The \fBinstallColormap\fP option doesn't work very well with the
 .BR twm (1)
 .B Colormap lossage: TWM
 The \fBinstallColormap\fP option doesn't work very well with the
 .BR twm (1)


@@ -948,16 +967,30 @@ The
 .BR mwm (1)
 and
 .BR olwm (1)
 .BR mwm (1)
 and
 .BR olwm (1)

-window managers don't seem to have this problem.  The race condition exists
-because X does not provide a way for an OverrideRedirect window to have its
-own colormap, short of grabbing the server (which is neither a good idea, nor
-really possible with the current design.)  What happens is that, as soon as
-the screensaver installs its colormap, \fBtwm\fP responds to 
-the \fBColormapNotify\fP event that is generated by re-instaling the default
-colormap.  Apparently, \fBtwm\fP doesn't \fIalways\fP do this; it seems to do
-it regularly if the screensaver is activated from a menu item, but seems to
-not do it if the screensaver comes on of its own volition, or is activated
-from another console.  Any thoughts on this problem are welcome...
+window managers don't have this problem.  The race condition exists
+because X (really, ICCCM) does not provide a way for an OverrideRedirect 
+window to have its own colormap, short of grabbing the server (which is 
+neither a good idea, nor really possible with the current design.)  What 
+happens is that, as soon as xscreensaver installs its colormap, \fBtwm\fP 
+responds to the resultant \fBColormapNotify\fP event by re-instaling the 
+default colormap.  Apparently, \fBtwm\fP doesn't \fIalways\fP do this; it 
+seems to do it regularly if the screensaver is activated from a menu item, 
+but seems to not do it if the screensaver comes on of its own volition, or 
+is activated from another console.  
+.RS 8
+.TP 4
+.B Attention, window manager authors!
+You should only call
+.BR XInstallColormap (3)
+in response to user events.  That is, it is appropriate to install a colormap
+in response to \fBFocusIn\fP, \fBFocusOut\fP, \fBEnterNotify\fP, 
+and \fBLeaveNotify\fP events; but it is not appropriate to call it in
+response to \fBColormapNotify\fP events.  If you install colormaps in
+response to \fIapplication\fP actions as well as in response to \fIuser\fP
+actions, then you create the situation where it is impossible for 
+override-redirect applications (such as xscreensaver) to display their
+windows in the proper colors.
+.RE

 .TP 8
 .B Colormap lossage: XV, XAnim, XEarth
 Some programs don't operate properly on visuals other than the default one,
 .TP 8
 .B Colormap lossage: XV, XAnim, XEarth
 Some programs don't operate properly on visuals other than the default one,


@@ -966,8 +999,8 @@ magic "default-n" visual name in the description of the \fBprograms\fP
 resource in the \fIConfiguration\fP section.  When programs only work with
 the default colormap, you need to use a syntax like this:
 .EX
 resource in the \fIConfiguration\fP section.  When programs only work with
 the default colormap, you need to use a syntax like this:
 .EX

-    default-n: xv -root image-1.gif -quit  \\n\\
-    default-n: xearth -nostars -wait 0     \\n\\
+   default-n: xv -root image-1.gif -quit  \\n\\
+   default-n: xearth -nostars -wait 0     \\n\\

 .EE
 It would also work to turn off the \fBinstallColormap\fP option altogether,
 but that would deny extra colors to those programs that \fIcan\fP take
 .EE
 It would also work to turn off the \fBinstallColormap\fP option altogether,
 but that would deny extra colors to those programs that \fIcan\fP take