faulthandler.enable() writes to sys.stderr by default, and raises
RuntimeError('sys.stderr is None') when the gateway is launched
without an attached console — e.g. via the Windows Startup VBS shim,
pythonw.exe, a detached service, or any parent that redirects stderr
to DEVNULL. Because this happens on the very first line of
GatewayRunner.start(), the whole gateway used to die at startup and
every configured platform adapter (Discord bot, Telegram, Slack, …)
would silently show offline until the user manually re-ran
'hermes gateway run --replace' from a real terminal.
Wrap the call and fall back to a log-file file descriptor
(logs/gateway_faulthandler.log) when stderr is unavailable, so
fatal-error stack dumps still land somewhere useful. If even the
fallback fails we log-and-continue rather than kill the gateway.
Repro traceback (from a real user's gateway-exit-diag.log, launched
via the Startup VBS with stdin_is_tty=false):
File "gateway/run.py", line 7821, in start
faulthandler.enable()
RuntimeError: sys.stderr is None
hereicq
3ec5fb076e