Daan De Meyer
89a4dba4a7
The mock servers previously framed messages by hand: loop_write()+"\r\n" on
the way out, a single read(fd, buf, 4095)+sd_json_parse() on the way in,
and a custom recvmsg()+CMSG_FOREACH() for the fd-passing test. That only
works when each write-on-the-wire happens to be delivered in its own
recv(); the moment a test wants to issue back-to-back commands without
waiting for replies, the kernel coalesces them and sd_json_parse() chokes
on two concatenated objects.
Route the mock servers through the same JsonStream transport the client
uses: a tiny mock_qmp_init/recv/send/send_literal layer over json_stream
takes care of the CRLF delimiter, the output queue, and SCM_RIGHTS. The
recv helper loops parse→read→wait so coalesced inbound bytes get fed out
one complete message at a time.
Drop the bespoke mock_qmp_recv_command() and replace it with
json_stream_set_allow_fd_passing_input() +
json_stream_{get_n,take,close}_input_fds() in the fd-first test. EOF
signalling moves from an explicit safe_close() to the
_cleanup_(json_stream_done) on the JsonStream.
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