Daan De Meyer
6b1a59d594
Introduces JsonStream, a generic transport layer for JSON-line message exchange over a pair of file descriptors. It owns the input/output buffers, SCM_RIGHTS fd passing, the deferred output queue, the read/write/parse step functions, sd-event integration (input/output/time event sources), the idle timeout machinery, and peer credential caching, but knows nothing about the specific JSON protocol on top — the consumer drives its state machine via phase/dispatch callbacks supplied at construction. sd-varlink is reworked to delegate the entire transport layer to a JsonStream owned by sd_varlink. The varlink struct drops every transport-related field (input/output buffers and fds, output queue, fd-passing state, ucred/pidfd cache, prefer_read/write fallback, idle timeout, description, event sources) — all of that lives in JsonStream now. What remains in sd_varlink is the varlink-protocol state machine (state, n_pending, current/previous/sentinel, server linkage, peer credentials accounting, exec_pidref, the varlink-specific quit and defer sources) and a thin wrapper layer over the JsonStream API. The should_disconnect / get_timeout / get_events / wait helpers all live in JsonStream now and are driven by a JsonStreamPhase the consumer reports via its phase callback.
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