Add option to not kill saver when DPMS kicks in (#154)

Author: vincentbernat

README.md

@@ -443,6 +443,8 @@ Options to XSecureLock can be passed by environment variables:
 *   `XSECURELOCK_SAVER_DELAY_MS`: Milliseconds to wait after starting
     children process and before mapping windows to let children be
     ready to display and reduce the black flash.
+*   `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

@@ -152,6 +152,8 @@ const char *blank_dpms_state = "off";
 int saver_reset_on_auth_close = 0;
 //! Delay we should wait before starting mapping windows to let children run.
 int saver_delay_ms = 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;
@@ -441,6 +443,7 @@ void LoadDefaults() {
   saver_reset_on_auth_close =
       GetIntSetting("XSECURELOCK_SAVER_RESET_ON_AUTH_CLOSE", 0);
   saver_delay_ms = GetIntSetting("XSECURELOCK_SAVER_DELAY_MS", 0);
+  saver_stop_on_dpms = GetIntSetting("XSECURELOCK_SAVER_STOP_ON_DPMS", 1);
 }
 
 /*! \brief Parse the command line arguments, or exit in case of failure.
@@ -1171,7 +1174,7 @@ int main(int argc, char **argv) {
 
     // Make sure to shut down the saver when blanked. Saves power.
     enum WatchChildrenState requested_saver_state =
-        blanked ? WATCH_CHILDREN_SAVER_DISABLED : xss_requested_saver_state;
+      (saver_stop_on_dpms && blanked) ? WATCH_CHILDREN_SAVER_DISABLED : xss_requested_saver_state;
 
     // Now check status of our children.
     if (WatchChildren(display, auth_window, saver_window, requested_saver_state,