fs: implement AccessLog, enable for File operations

libraries/libstratosphere/source/fs/fs_context.cpp

@@ -0,0 +1,74 @@
+/*
+ * 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::fs {
+
+    namespace {
+
+        constinit bool g_auto_abort_enabled = true;
+
+        /* NOTE: This generates a global constructor. */
+        os::SdkThreadLocalStorage g_context_tls;
+
+    }
+
+    void SetEnabledAutoAbort(bool enabled) {
+        g_auto_abort_enabled = enabled;
+    }
+
+    AbortSpecifier DefaultResultHandler(Result result) {
+        if (g_auto_abort_enabled) {
+            return AbortSpecifier::Default;
+        } else {
+            return AbortSpecifier::Return;
+        }
+    }
+
+    AbortSpecifier AlwaysReturnResultHandler(Result result) {
+        return AbortSpecifier::Return;
+    }
+
+    constinit FsContext g_default_context(DefaultResultHandler);
+    constinit FsContext g_always_return_context(AlwaysReturnResultHandler);
+
+    void SetDefaultFsContextResultHandler(const ResultHandler handler) {
+        if (handler == nullptr) {
+            g_default_context.SetHandler(DefaultResultHandler);
+        } else {
+            g_default_context.SetHandler(handler);
+        }
+    }
+
+    const FsContext *GetCurrentThreadFsContext() {
+        const FsContext *context = reinterpret_cast<const FsContext *>(g_context_tls.GetValue());
+
+        if (context == nullptr) {
+            context = std::addressof(g_default_context);
+        }
+
+        return context;
+    }
+
+    void SetCurrentThreadFsContext(const FsContext *context) {
+        g_context_tls.SetValue(reinterpret_cast<uintptr_t>(context));
+    }
+
+    ScopedAutoAbortDisabler::ScopedAutoAbortDisabler() : prev_context(GetCurrentThreadFsContext()) {
+        SetCurrentThreadFsContext(std::addressof(g_always_return_context));
+    }
+
+}