Kernel+LibC: Turn errno codes into a strongly typed enum

..and allow implicit creation of KResult and KResultOr from ErrnoCode.
This means that kernel functions that return those types can finally
do "return EINVAL;" and it will just work.

There's a handful of functions that still deal with signed integers
that should be converted to return KResults.

1 files changed, 2 insertions, 2 deletions

diff --git a/Kernel/FileSystem/AnonymousFile.h b/Kernel/FileSystem/AnonymousFile.h
index 66b6c331e5..d95fc5fcb0 100644
--- a/Kernel/FileSystem/AnonymousFile.h
+++ b/Kernel/FileSystem/AnonymousFile.h
@@ -46,8 +46,8 @@ private:
     virtual String absolute_path(const FileDescription&) const override { return ":anonymous-file:"; }
     virtual bool can_read(const FileDescription&, size_t) const override { return false; }
     virtual bool can_write(const FileDescription&, size_t) const override { return false; }
-    virtual KResultOr<size_t> read(FileDescription&, size_t, UserOrKernelBuffer&, size_t) override { return KResult(-ENOTSUP); }
-    virtual KResultOr<size_t> write(FileDescription&, size_t, const UserOrKernelBuffer&, size_t) override { return KResult(-ENOTSUP); }
+    virtual KResultOr<size_t> read(FileDescription&, size_t, UserOrKernelBuffer&, size_t) override { return ENOTSUP; }
+    virtual KResultOr<size_t> write(FileDescription&, size_t, const UserOrKernelBuffer&, size_t) override { return ENOTSUP; }
 
     explicit AnonymousFile(NonnullRefPtr<AnonymousVMObject>);