Add option to not kill saver when DPMS kicks in

Author: vincentbernat

README.md

@@ -408,6 +408,8 @@ Options to XSecureLock can be passed by environment variables:
     locking) when above xss-lock command line is used. Should be at least as
     large as the period time set using "xset s". Also used by `wait_nonidle` to
     know when to assume dimming and waiting has finished and exit.
+*   `XSECURELOCK_SAVER_STOP_ON_DPMS`: specifies if saver is stopped
+    when DPMS blanks the screen (to save power).
 *   `XSECURELOCK_XSCREENSAVER_PATH`: Location where XScreenSaver hacks are
     installed for use by `saver_xscreensaver`.
 

main.c

@@ -144,6 +144,8 @@ int force_grab = 0;
 int debug_window_info = 0;
 //! Whether to reset the saver module when auth closes.
 int saver_reset_on_auth_close = 0;
+//! Whetever stopping saver when DPMS is running
+int saver_stop_on_dpms = 0;
 
 //! The PID of a currently running notify command, or 0 if none is running.
 pid_t notify_command_pid = 0;
@@ -339,6 +341,7 @@ void LoadDefaults() {
   debug_window_info = GetIntSetting("XSECURELOCK_DEBUG_WINDOW_INFO", 0);
   saver_reset_on_auth_close =
       GetIntSetting("XSECURELOCK_SAVER_RESET_ON_AUTH_CLOSE", 0);
+  saver_stop_on_dpms = GetIntSetting("XSECURELOCK_SAVER_STOP_ON_DPMS", 1);
 }
 
 /*! \brief Parse the command line arguments, or exit in case of failure.
@@ -1036,7 +1039,8 @@ int main(int argc, char **argv) {
     select(x11_fd + 1, &in_fds, 0, 0, &tv);
 
     // Make sure to shut down the saver when blanked. Saves power.
-    enum WatchChildrenState requested_saver_state = IsBlankedByDPMS(display) ?
+    enum WatchChildrenState requested_saver_state =
+      (saver_stop_on_dpms && IsBlankedByDPMS(display)) ?
       WATCH_CHILDREN_SAVER_DISABLED : xss_requested_saver_state;
 
     // Now check status of our children.