1 files changed, 57 insertions, 0 deletions
diff --git a/Kernel/FileSystem/AnonymousFile.cpp b/Kernel/FileSystem/AnonymousFile.cpp
new file mode 100644
index 0000000000..676bee25e5
--- /dev/null
+++ b/Kernel/FileSystem/AnonymousFile.cpp
@@ -0,0 +1,57 @@
+/*
+ * Copyright (c) 2021, Andreas Kling <kling@serenityos.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <Kernel/FileSystem/AnonymousFile.h>
+#include <Kernel/Process.h>
+#include <Kernel/VM/AnonymousVMObject.h>
+
+namespace Kernel {
+
+AnonymousFile::AnonymousFile(NonnullRefPtr<AnonymousVMObject> vmobject)
+    : m_vmobject(move(vmobject))
+{
+}
+
+AnonymousFile::~AnonymousFile()
+{
+}
+
+KResultOr<Region*> AnonymousFile::mmap(Process& process, FileDescription&, VirtualAddress preferred_vaddr, size_t offset, size_t size, int prot, bool shared)
+{
+    if (offset != 0)
+        return KResult(-EINVAL);
+
+    if (size != m_vmobject->size())
+        return KResult(-EINVAL);
+
+    auto* region = process.allocate_region_with_vmobject(preferred_vaddr, size, m_vmobject, offset, {}, prot, shared);
+    if (!region)
+        return KResult(-ENOMEM);
+
+    return region;
+}
+
+}