These new calls will do three things: 1. in case of FILE* stuff: flush any pending bytes onto the fd, just in case 2. seal the backing memfd 3. seek back to the beginning. Note that this adds sealing to serialization: once we serialized fully, we'll seal the thing off for further modifications, before we pass the fd over to the target process. This should add a bit of robustness, and maybe finds a bug or two one day, if we accidentally write to a serialization that is complete.
System and Service Manager
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