[lldb-dev] Trying to use socketpair for lldb-server fails

Ted Woodward via lldb-dev lldb-dev at lists.llvm.org
Fri Jul 21 11:55:29 PDT 2017

The first thing I'd do is use the lldb logging mechanism. lldb-server closes
its own stdout and stderr, because nobody is interested in output from the
server, just from the target. Except when you're debugging the server, so
there is an easy way to turn on logging.

Set the following environment variables:
LLDB_DEBUGSERVER_LOG_FILE - this contains the path to the file the logs will
be written to
LLDB_SERVER_LOG_CHANNELS - this contains the channels and categories to turn
logging on for. The format is "channel category:channel category...". If you
want more than 1 category for a channel, I think "channel cat1 cat2..."
works. This is not spelled out very clearly, unfortunately.

Quickly glancing at the code, it looks like you need to implement a
socketpair connection, and handling of the fd:// connection URL, starting in
ConnectionFileDescriptor::Connect. The log for this would be "lldb


Qualcomm Innovation Center, Inc.
The Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a
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> -----Original Message-----
> From: lldb-dev [mailto:lldb-dev-bounces at lists.llvm.org] On Behalf Of Demi
> Obenour via lldb-dev
> Sent: Wednesday, July 19, 2017 7:44 PM
> To: lldb-dev at lists.llvm.org
> Subject: [lldb-dev] Trying to use socketpair for lldb-server fails
> To avoid a local privilage escalation, I am trying to patch LLDB not to
use a TCP
> socket for local communication.
> The attached patch failed.  Would anyone be able to provide suggestions
> how to debug the problem?
> Sincerely,
> Demi

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