Avoid JSONRPC client write spins#13329
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JSONRPC clients use nonblocking Unix sockets, so a full peer receive buffer can make write return EAGAIN. The old retry loop treated that like EINTR and immediately retried forever, which could hang the jsonrpc server tests during large request and restart coverage. This waits for socket write readiness before retrying transient backpressure and reports ETIMEDOUT when the readiness wait expires, while preserving readiness poll errors. This also adds a regression test that fills a socketpair and verifies that the helper returns with that timeout signal instead of spinning.
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JSONRPC clients use nonblocking Unix sockets, so a full peer receive
buffer can make write return EAGAIN. The old retry loop treated that
like EINTR and immediately retried forever, which could hang the
jsonrpc server tests during large request and restart coverage.
This waits for socket write readiness before retrying transient
backpressure and treats an unwritable or zero-byte write as a failure.
This also adds a regression test that fills a socketpair and verifies
that the helper returns instead of spinning.