Let's normalize how we release service resources, i.e. the three types of fds we maintain for each service: 1. the fdstore 2. the socket fd for per-connection socket activated services 3. stdin/stdout/stderr The generic service_release_resources() hook now calls into service_release_fd_store() + service_close_socket_fd() service_release_stdio_fd() one after the other, releasing them all for the generic "release_resources" infra of the unit lifecycle. We do no longer close the socket fd from service_set_state(), moving this exclusively into service_release_resources(), so that all fds are closed the same way.
System and Service Manager
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