From 90fc6dabf7ca0b2b8346d1d8f809f58e263ed0b5 Mon Sep 17 00:00:00 2001
From: noah the goodra <peterpan0413@live.com>
Date: Wed, 8 Feb 2017 14:31:23 -0600
Subject: [PATCH] Implemented/stubbed PrepareToCloseApplication

I implemented/stubbed this function in hopes of fixing the crash to desktop issue that homebrew causes when it tries to exit back to the homemenu
---
 src/core/hle/service/apt/apt.cpp   |  6 +++++-
 src/core/hle/service/apt/apt.h     | 11 ++++++++++-
 src/core/hle/service/apt/apt_u.cpp |  2 +-
 3 files changed, 16 insertions(+), 3 deletions(-)

diff --git a/src/core/hle/service/apt/apt.cpp b/src/core/hle/service/apt/apt.cpp
index 615fe31ea..bd0c49018 100644
--- a/src/core/hle/service/apt/apt.cpp
+++ b/src/core/hle/service/apt/apt.cpp
@@ -395,7 +395,11 @@ void StartLibraryApplet(Service::Interface* self) {
 
     cmd_buff[1] = applet->Start(parameter).raw;
 }
-
+void PrepareToCloseApplication(Service::Interface* self) {
+    u32* cmd_buff = Kernel::GetCommandBuffer();
+    cmd_buff[1] = RESULT_SUCCESS.raw;
+    LOG_WARNING(Service_APT, "(STUBBED) called");
+}
 void CancelLibraryApplet(Service::Interface* self) {
     u32* cmd_buff = Kernel::GetCommandBuffer();
     u32 exiting = cmd_buff[1] & 0xFF;
diff --git a/src/core/hle/service/apt/apt.h b/src/core/hle/service/apt/apt.h
index 80325361f..9ad1dcdb8 100644
--- a/src/core/hle/service/apt/apt.h
+++ b/src/core/hle/service/apt/apt.h
@@ -321,7 +321,16 @@ void PrepareToStartApplication(Service::Interface* self);
  *     1 : Result of function, 0 on success, otherwise error code
 */
 void StartApplication(Service::Interface* self);
-
+/**
+ * APT::PrepareToCloseApplication service function
+ *  Inputs:
+ *      0 : Command header [0x00180040]
+ *      1 : u8, Cancel Preload (0 = don't cancel, 1 = cancel)
+ *  Outputs:
+ *      0 : Return header
+ *      1 : Result of function, 0 on success, otherwise error code
+ */
+void PrepareToCloseApplication(Service::Interface* self);
 /**
  * APT::AppletUtility service function
  *  Inputs:
diff --git a/src/core/hle/service/apt/apt_u.cpp b/src/core/hle/service/apt/apt_u.cpp
index e06084a1e..79b41ad5f 100644
--- a/src/core/hle/service/apt/apt_u.cpp
+++ b/src/core/hle/service/apt/apt_u.cpp
@@ -42,7 +42,7 @@ const Interface::FunctionInfo FunctionTable[] = {
     {0x001F0084, nullptr, "StartSystemApplet"},
     {0x00200044, nullptr, "StartNewestHomeMenu"},
     {0x00210000, nullptr, "OrderToCloseApplication"},
-    {0x00220040, nullptr, "PrepareToCloseApplication"},
+    {0x00220040, PrepareToCloseApplication, "PrepareToCloseApplication"},
     {0x00230040, nullptr, "PrepareToJumpToApplication"},
     {0x00240044, nullptr, "JumpToApplication"},
     {0x002500C0, nullptr, "PrepareToCloseLibraryApplet"},