12.4 Sending a pre-built frame

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ssize_t rsi_write_response(int fd, const void *frame, size_t len);

Writes one already-built response frame to the source fd — a thin write(2) wrapper returning the bytes written, or -1 with errno. Most callers never need this; the rsi_respond_* helpers build and send. It exists for callers assembling frames by other means.

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