[tma2] [Ongoing] Continue implementing modules for tma2. (#1388)

* cs: add stub sysmodule to host command shell server

* cs: implement logic for main (linker error paradise, for now)

* cs: implement more of the system module's skeleton

* htcs: update client type names for libnx pr merge

libraries/libstratosphere/source/scs/scs_shell.cpp

@@ -0,0 +1,152 @@
+/*
+ * Copyright (c) 2018-2020 Atmosphère-NX
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#include <stratosphere.hpp>
+
+namespace ams::scs {
+
+    namespace {
+
+        struct SocketInfo {
+            u64 id;
+            s32 socket;
+        };
+
+        struct ProgramInfo {
+            os::ProcessId process_id;
+            u64 id;
+            s32 socket;
+            s32 info_id;
+            bool _18;
+            bool _19;
+            bool _1A;
+        };
+
+        constexpr inline auto MaxSocketInfo  = 2;
+        constexpr inline auto MaxProgramInfo = 64;
+
+        class SocketInfoManager {
+            private:
+                SocketInfo m_infos[MaxProgramInfo];
+                int m_count;
+            public:
+                constexpr SocketInfoManager() = default;
+
+                void Initialize() {
+                    /* Clear our count. */
+                    m_count = 0;
+                }
+        };
+
+        class ProgramInfoManager {
+            private:
+                s32 m_next_info_id;
+                ProgramInfo m_infos[MaxProgramInfo];
+                int m_count;
+            public:
+                constexpr ProgramInfoManager() = default;
+
+                void Initialize() {
+                    /* Reset our next id. */
+                    m_next_info_id = 1;
+
+                    /* Clear our count. */
+                    m_count = 0;
+                }
+        };
+
+        alignas(os::ThreadStackAlignment) constinit u8 g_thread_stack[os::MemoryPageSize];
+        constinit os::ThreadType g_thread;
+
+        constinit ProcessEventHandler g_common_start_handler;
+        constinit ProcessEventHandler g_common_exit_handler;
+        constinit ProcessEventHandler g_common_jit_debug_handler;
+
+        constinit SocketInfoManager g_socket_info_manager;
+        constinit ProgramInfoManager g_program_info_manager;
+
+        void EventHandlerThread(void *) {
+            /* TODO */
+            AMS_ABORT("scs::EventHandlerThread");
+        }
+
+        void StartEventHandlerThread() {
+            /* Create the handler thread. */
+            R_ABORT_UNLESS(os::CreateThread(std::addressof(g_thread), EventHandlerThread, nullptr, g_thread_stack, sizeof(g_thread_stack), AMS_GET_SYSTEM_THREAD_PRIORITY(scs, ShellEventHandler)));
+
+            /* Set the handler thread's name. */
+            os::SetThreadNamePointer(std::addressof(g_thread), AMS_GET_SYSTEM_THREAD_NAME(scs, ShellEventHandler));
+
+            /* Start the handler thread. */
+            os::StartThread(std::addressof(g_thread));
+        }
+
+        Result PrepareToLaunchProgram(ncm::ProgramId program_id, const void *args, size_t args_size) {
+            /* Set the arguments. */
+            R_TRY_CATCH(ldr::SetProgramArgument(program_id, args, args_size)) {
+                R_CATCH(ldr::ResultTooManyArguments) {
+                    /* There are too many arguments already registered. Flush the arguments queue. */
+                    R_TRY(ldr::FlushArguments());
+
+                    /* Try again. */
+                    R_TRY(ldr::SetProgramArgument(program_id, args, args_size));
+                }
+            } R_END_TRY_CATCH;
+
+            return ResultSuccess();
+        }
+
+        void FlushProgramArgument(ncm::ProgramId program_id) {
+            /* Ensure there are no arguments for the program. */
+            ldr::SetProgramArgument(program_id, "", 1);
+        }
+
+    }
+
+    void InitializeShell() {
+        /* Initialize our managers. */
+        g_socket_info_manager.Initialize();
+        g_program_info_manager.Initialize();
+
+        /* Start our event handler. */
+        StartEventHandlerThread();
+    }
+
+    void RegisterCommonProcessEventHandler(ProcessEventHandler on_start, ProcessEventHandler on_exit, ProcessEventHandler on_jit_debug) {
+        g_common_start_handler     = on_start;
+        g_common_exit_handler      = on_exit;
+        g_common_jit_debug_handler = on_jit_debug;
+    }
+
+    bool RegisterSocket(s32 socket);
+    void UnregisterSocket(s32 socket);
+
+    Result LaunchProgram(os::ProcessId *out, ncm::ProgramId program_id, const void *args, size_t args_size, u32 process_flags) {
+        /* Set up the arguments. */
+        PrepareToLaunchProgram(program_id, args, args_size);
+
+        /* Ensure arguments are managed correctly. */
+        ON_SCOPE_EXIT { FlushProgramArgument(program_id); };
+
+        /* Launch the program. */
+        const ncm::ProgramLocation loc = ncm::ProgramLocation::Make(program_id, ncm::StorageId::BuiltInSystem);
+        R_TRY(pgl::LaunchProgram(out, loc, process_flags | pm::LaunchFlags_SignalOnExit, 0));
+
+        return ResultSuccess();
+    }
+
+    Result SubscribeProcessEvent(s32 socket, bool is_register, u64 id);
+
+}