From 84b789844b78022712cc403fef49476ccea916bc Mon Sep 17 00:00:00 2001
From: Enrico Zini <enrico@enricozini.org>
Date: Tue, 11 Aug 2009 22:39:12 +0100
Subject: [PATCH] Second attempt at locking the screen

---
 src/app_powerbutton.vala | 27 ++++++++++++++++++++-------
 1 file changed, 20 insertions(+), 7 deletions(-)

diff --git a/src/app_powerbutton.vala b/src/app_powerbutton.vala
index 175e67f..0d12a8a 100644
--- a/src/app_powerbutton.vala
+++ b/src/app_powerbutton.vala
@@ -136,26 +136,36 @@ public class CommandButton : Gtk.Button
 	}
 }
 
-private bool screen_locked = false;
+private bool screen_locked;
+private int screen_lock_fd;
 
 private void set_screen_lock(bool locked)
 {
-		int fd = Posix.open("/dev/input/event1", Posix.O_RDWR | Posix.O_NONBLOCK);
-		if (fd < 0)
+	if (locked && screen_locked)
+		return;
+	if (!locked && !screen_locked)
+		return;
+
+	if (locked)
+	{
+		screen_lock_fd = Posix.open("/dev/input/event1", Posix.O_RDWR | Posix.O_NONBLOCK);
+		if (screen_lock_fd < 0)
 		{
 			zavai.log.error("Cannot open /dev/input/event1");
 			return;
 		}
 
 		int EVIOCGRAB = 0x40044590;
-		if (Posix.ioctl(fd, EVIOCGRAB, locked ? 1 : 0) != 0)
+		if (Posix.ioctl(screen_lock_fd, EVIOCGRAB, locked ? 1 : 0) != 0)
 		{
 			zavai.log.error("Cannot EVIOCGRAB /dev/input/event1");
-			Posix.close(fd);
+			Posix.close(screen_lock_fd);
 			return;
 		}
-		screen_locked = locked;
-		Posix.close(fd);
+	} else {
+		Posix.close(screen_lock_fd);
+	}
+	screen_locked = locked;
 }
 
 public class ScreenLockButton : Gtk.Button
@@ -194,6 +204,9 @@ Launcher launcher;
 
 public void init()
 {
+	screen_locked = false;
+	screen_lock_fd = -1;
+
 	zavai.input.power_button.power_button += on_power_button;
 
     // Menus
-- 
2.30.2