Initial curtain mode implementation.

BUG=
TEST=

Review URL: http://codereview.chromium.org/6849027

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@87350 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 24 insertions, 1 deletions

diff --git a/remoting/host/curtain_mac.cc b/remoting/host/curtain_mac.cc
index b6c741a..aef87c1 100644
--- a/remoting/host/curtain_mac.cc
+++ b/remoting/host/curtain_mac.cc
@@ -8,6 +8,12 @@
 #include "base/compiler_specific.h"
 #include "base/logging.h"
 
+namespace {
+static const char* kCGSessionPath =
+    "/System/Library/CoreServices/Menu Extras/User.menu/Contents/Resources/"
+    "CGSession";
+}
+
 namespace remoting {
 
 namespace {
@@ -22,12 +28,29 @@ class CurtainMac : public Curtain {
 };
 
 void CurtainMac::EnableCurtainMode(bool enable) {
-  NOTIMPLEMENTED();
+  // Whether curtain mode is being enabled or disabled, switch out the session.
+  // TODO(jamiewalch): If curtain mode is being enabled at the login screen, it
+  // should be deferred until the user logs in.
+  pid_t child = fork();
+  if (child == 0) {
+    execl(kCGSessionPath, kCGSessionPath, "-suspend", (char*)0);
+    exit(1);
+  } else if (child > 0) {
+    int status = 0;
+    waitpid(child, &status, 0);
+    // To ensure that the system has plenty of time to notify the CGDisplay-
+    // ReconfigurationCallback, sleep here. 1s is probably overkill.
+    sleep(1);
+  }
 }
 
 }  // namespace
 
 Curtain* Curtain::Create() {
+  // There's no need to check for curtain mode being enabled here because on
+  // the mac it's easy for a local user to recover if anything crashes while
+  // a session is active--they just have to enter a password to switch their
+  // session back in.
   return new CurtainMac();
 }