--- vnc-4_1_1-unixsrc/unix/vncviewer/vncviewer.cxx.xscreensaver	2005-09-06 13:39:13.000000000 +0100
+++ vnc-4_1_1-unixsrc/unix/vncviewer/vncviewer.cxx	2005-09-06 14:46:29.000000000 +0100
@@ -22,6 +22,7 @@
 #include <string.h>
 #include <stdio.h>
 #include <ctype.h>
+#include <fcntl.h>
 #include <stdlib.h>
 #include <sys/time.h>
 #include <sys/types.h>
@@ -111,6 +112,45 @@
   exit(1);
 }
 
+static void deactivate_xscreensaver (void)
+{
+  if (!fullScreen)
+    return;
+
+  pid_t pid = fork();
+
+  if (pid < 0) {
+    perror("fork");
+    return;
+  }
+
+  if (pid == 0) {
+    // child
+    close (STDIN_FILENO);
+    close (STDOUT_FILENO);
+    close (STDERR_FILENO);
+    int null = open ("/dev/null", O_RDWR);
+    if (null != STDIN_FILENO)
+      dup2 (null, STDIN_FILENO);
+    if (null != STDOUT_FILENO)
+      dup2 (null, STDOUT_FILENO);
+    if (null != STDERR_FILENO)
+      dup2 (null, STDERR_FILENO);
+    execlp ("xscreensaver-command",
+	    "xscreensaver-command", "-deactivate", NULL);
+  }
+
+  // reap previous child
+  while (wait3(NULL, WNOHANG, 0) > 0) ;
+}
+
+static const unsigned int alarm_period = 59;
+static int alarm_caught;
+static void AlarmSignalHandler(int sig)
+{
+  alarm_caught = 1;
+}
+
 // XLoginIconifier is a class which iconifies the XDM login window when it has
 // grabbed the keyboard, thus releasing the grab, allowing the viewer to use
 // the keyboard.  It remaps the xlogin window on exit.
@@ -230,6 +270,7 @@
   signal(SIGHUP, CleanupSignalHandler);
   signal(SIGINT, CleanupSignalHandler);
   signal(SIGTERM, CleanupSignalHandler);
+  signal(SIGALRM, AlarmSignalHandler);
 
   programName = argv[0];
   char* vncServerName = 0;
@@ -312,9 +353,16 @@
 
     // X events are processed whenever reading from the socket would block.
 
+    alarm (alarm_period);
     while (true) {
       cc.getInStream()->check(1);
       cc.processMsg();
+
+      if (alarm_caught) {
+	alarm_caught = 0;
+	deactivate_xscreensaver ();
+	alarm (alarm_period);
+      }
     }
 
   } catch (rdr::EndOfStream& e) {
--- vnc-4_1_1-unixsrc/unix/vncviewer/CConn.cxx.xscreensaver	2005-09-06 13:49:22.000000000 +0100
+++ vnc-4_1_1-unixsrc/unix/vncviewer/CConn.cxx	2005-09-06 14:50:05.000000000 +0100
@@ -184,7 +184,11 @@
     FD_SET(ConnectionNumber(dpy), &rfds);
     FD_SET(sock->getFd(), &rfds);
     int n = select(FD_SETSIZE, &rfds, 0, 0, tvp);
-    if (n < 0) throw rdr::SystemException("select",errno);
+    if (n < 0) {
+      if (errno == EINTR)
+        continue;
+      throw rdr::SystemException("select",errno);
+    }
   } while (!(FD_ISSET(sock->getFd(), &rfds)));
 }