xref: /llvm-project/lldb/docs/man/lldb-server.rst (revision 2e89312419c5f7875c947fcf79ea0446cf65a287)

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lldb-server -- Server for LLDB Debugging Sessions
=================================================

.. program:: lldb-server

SYNOPSIS
--------

| :program:`lldb-server` v[ersion]
| :program:`lldb-server` g[dbserver] [*options*]
| :program:`lldb-server` p[latform] [*options*]

DESCRIPTION
-----------

:program:`lldb-server` provides the server counterpart of the LLVM debugger.
The server runs and monitors the debugged program, while the user interfaces
with it via a client, either running locally or connecting remotely.

All of the code in the LLDB project is available under the Apache 2.0 License
with LLVM exceptions.

COMMANDS
--------

The first argument to lldb-server specifies a command to run.

.. option:: v[ersion]

 Prints lldb-server version and exits.

.. option:: g[dbserver]

 Runs the server using the gdb-remote protocol. LLDB can afterwards
 connect to the server using *gdb-remote* command.

.. option:: p[latform]

 Runs the platform server. LLDB can afterwards connect to the server using
 *platform select*, followed by *platform connect*.

GDBSERVER COMMAND
-----------------

| :program:`lldb-server` g[dbserver] [*options*] [[*host*]:*port*] [[--] *program* *args*...]

CONNECTION
~~~~~~~~~~

.. option:: host:port

 Specifies the hostname and TCP port to listen on. Obligatory unless another
 listening option is used. If host is empty, *localhost* will be used.  If port
 is zero, a random port will be selected, and written as specified by --pipe
 or --named-pipe options.

.. option:: --fd <fd>

 Communicate over the given file descriptor instead of sockets.

.. option:: --named-pipe <name>

 Write the listening port number to the specified named pipe.

.. option:: --pipe <fd>

 Write the listening port number to the specified pipe (fd).

.. option:: --reverse-connect

 Connect to the client instead of passively waiting for a connection. In this
 case, [host]:port denotes the remote address to connect to.

GENERAL OPTIONS
~~~~~~~~~~~~~~~

.. option:: --help

 Prints out the usage information and exits.

.. option:: --log-channels <channel1 categories...:channel2 categories...>

 Channels to log. A colon-separated list of entries. Each entry starts with
 a channel followed by a space-separated list of categories.

.. option:: --log-file <file>

 Destination file to log to. If empty, log to stderr.

.. option:: --setsid

 Run lldb-server in a new session.

TARGET SELECTION
~~~~~~~~~~~~~~~~

.. option:: --attach <pid-or-name>

 Attach to the process given by a (numeric) process id or a name.

.. option:: -- program args

 Launch a program for debugging.

If neither of target options are used, :program:`lldb-server` is started
without a specific target. It can be afterwards instructed by the client
to launch or attach.

PLATFORM COMMAND
----------------

| :program:`lldb-server` p[latform] [*options*] --server --listen [[*host*]:*port*]

CONNECTION
~~~~~~~~~~

.. option:: --server

 Run in server mode, handling multiple connections. If this is not specified,
 lldb-server will accept only one connection and exit when it is finished.

.. option:: --listen <host>:<port>

 Hostname and port to listen on. Obligatory. If *port* is zero, a random port
 will be used.

.. option:: --socket-file <path>

 Write the listening socket port number to the specified file.

GENERAL OPTIONS
~~~~~~~~~~~~~~~

.. option:: --log-channels <channel1 categories...:channel2 categories...>

 Channels to log. A colon-separated list of entries. Each entry starts with
 a channel followed by a space-separated list of categories.

.. option:: --log-file <file>

 Destination file to log to. If empty, log to stderr.

GDB-SERVER CONNECTIONS
~~~~~~~~~~~~~~~~~~~~~~

.. option:: --gdbserver-port <port>

 Define a port to be used for gdb-server connections. This port is used for
 multiple connections.

EXAMPLES
--------

The server can be started in several modes.

In order to launch a new process inside the debugger, pass the path to it
and the arguments to the debugged executable as positional arguments.
To disambiguate between arguments passed to lldb and arguments passed
to the debugged executable, arguments starting with a - must be passed after
--. The server will launch the new executable and stop it immediately, waiting
for the client to connect.

  lldb-server g :1234 /path/to/program program-argument -- --program-option

For convenience, passing the executable after -- is also supported.

  lldb-server g :1234 -- /path/to/program program-argument --program-option

In order to attach to a running process, pass --attach along with the process
identifier or name. The process will be stopped immediately after starting
the server. Note that terminating the server will usually cause the process
to be detached and continue execution.

  lldb-server g :1234 --attach 12345
  lldb-server g :1234 --attach program-name

Use *gdb-remote* command to connect to the server:

  (lldb) gdb-remote 1234

lldb-server can also be started without an inferior. In this case, the client
can select the target after connecting to the server. Note that some commands
(e.g. *target create*) will disconnect and launch a local lldb-server instead.

  lldb-server g :1234

  (lldb) gdb-remote 1234
  (lldb) process launch a.out

SEE ALSO
--------

The LLDB project page https://lldb.llvm.org has many different resources
for :program:`lldb-server` users.