From 3b6325916f4163c359f33dcf30c5c981386421d4 Mon Sep 17 00:00:00 2001
From: David Anderson <davea@ssl.berkeley.edu>
Date: Mon, 14 Feb 2011 23:29:03 +0000
Subject: [PATCH] - client, linux: use X server for idle detection if available

svn path=/trunk/boinc/; revision=23035
---
 checkin_notes            |  7 +++++++
 client/hostinfo_unix.cpp | 39 ++++++++++++++++++++++++++++++++++++++-
 configure.ac             | 14 ++++++++++++++
 3 files changed, 59 insertions(+), 1 deletion(-)

diff --git a/checkin_notes b/checkin_notes
index 6ce7267e7a..d292cb69b3 100644
--- a/checkin_notes
+++ b/checkin_notes
@@ -743,3 +743,10 @@ David  14 Feb 2011
     html/user/
         sample_index.php
         main.css
+
+David  14 Feb 2011
+    - client, linux: use X server for idle detection if available
+
+    configure.ac
+    client/
+        hostinfo_unix.cpp
diff --git a/client/hostinfo_unix.cpp b/client/hostinfo_unix.cpp
index 64c437a364..e6d6a5ad2f 100644
--- a/client/hostinfo_unix.cpp
+++ b/client/hostinfo_unix.cpp
@@ -149,6 +149,10 @@ mach_port_t gEventHandle = NULL;
 #define _SC_PAGESIZE _SC_PAGE_SIZE
 #endif
 
+#if HAVE_XSS
+#include <X11/extensions/scrnsaver.h>
+#endif
+
 // The following is intended to be true both on Linux
 // and Debian GNU/kFreeBSD (see trac #521)
 //
@@ -1679,7 +1683,33 @@ bool interrupts_idle(time_t t) {
     }
     return last_irq < t;
 }
-#endif
+
+#if HAVE_XSS
+// Ask the X server for user idle time (using XScreenSaver API)
+// Returns true if the idle_treshold is smaller than the
+// idle time of the user (means: true = user is idle)
+bool xss_idle(long idle_treshold) {
+    static XScreenSaverInfo* xssInfo = NULL;
+    static Display* disp = NULL;
+    
+    long idle_time = 0;
+    
+    if(disp != NULL) {
+        XScreenSaverQueryInfo(disp, DefaultRootWindow(disp), xssInfo);
+        idle_time = xssInfo->idle / 1000; // xssInfo->idle is in ms
+    } else {
+        disp = XOpenDisplay(NULL);
+        // XOpenDisplay may return NULL if there is no running X
+        // or DISPLAY points to wrong/invalid display
+        if(disp != NULL) {
+            xssInfo = XScreenSaverAllocInfo();
+        }
+    }
+
+    return idle_treshold < idle_time;
+}
+#endif // HAVE_XSS
+#endif // LINUX_LIKE_SYSTEM
 
 bool HOST_INFO::users_idle(bool check_all_logins, double idle_time_to_run) {
     time_t idle_time = time(0) - (long) (60 * idle_time_to_run);
@@ -1701,6 +1731,13 @@ bool HOST_INFO::users_idle(bool check_all_logins, double idle_time_to_run) {
     if (!interrupts_idle(idle_time)) {
         return false;
     }
+
+#if HAVE_XSS
+    if (!xss_idle((long)(idle_time_to_run * 60))) {
+        return false;
+    }
+#endif
+
 #else
     // We should find out which of the following are actually relevant
     // on which systems (if any)
diff --git a/configure.ac b/configure.ac
index b86ec1b118..e2e87b070c 100644
--- a/configure.ac
+++ b/configure.ac
@@ -549,6 +549,13 @@ fi
 
 AM_CONDITIONAL(BUILD_GRAPHICS_API, [ test "$have_glut" = yes ])
 
+dnl check for X screen saver lib
+AC_CHECK_LIB([Xss], [XScreenSaverAllocInfo], [have_Xss="yes"], [have_Xss="no"])
+AC_CHECK_HEADER([X11/extensions/scrnsaver.h], [have_Xss="yes"], [have_Xss="no"])
+if test "$have_Xss" == no; then
+    AC_MSG_WARN([libxss missing, disabling X ScreenSaver user idle detection])
+fi
+
 dnl --------------------------------------------------------------------------------
 dnl put double-inclusion protection into config.h
 AH_TOP([
@@ -791,6 +798,13 @@ if test "${ac_cv_func_res_init}" != "yes" ; then
 fi
 LIBS=$svlibs
 
+if test "$have_Xss" == yes; then
+    SAH_CHECK_LIB([Xss],[XScreenSaverAllocInfo],[
+        AC_DEFINE([HAVE_XSS],[1],[Define to 1 if you have xss library])
+        CLIENTLIBS="${sah_lib_last} ${CLIENTLIBS}"])
+    echo DEBUG: CLIENTLIBS=${CLIENTLIBS} >&5
+fi
+
 SAH_CHECK_LIB([resolv],[res_query],[
     AC_DEFINE([HAVE_RESOLV],[1],[Define to 1 if you have the resolv library])
     CLIENTLIBS="${sah_lib_last} ${CLIENTLIBS}"])