Question on lldb commands and remote connection

Hi

I cannot find the command set the working directory and

The command to set temporary breakpoint like tbreak in

Gdb.

For remote connection, I only find gdb-remote, which based

On manual is target remote. But I cannot find about how to

Use it and those matching control commands

target extended-remote

disconnect

monitor exit

set remote exec-file

Could Anyone tell me what they are?

Thanks,

Yin

Hi

I cannot find the command set the working directory and

(lldb) process launch --working-dir /tmp

If you are attaching to a GDB server that already has an existing process running, your GDB server is responsible for setting the working directory prior to LLDB attaching.

If you start GDB server with no executable, then you can use the LLDB specific packets for setting environment variables and setting the working directory, but most GDB servers don't support that. Let me know if you want to know more about that.

The command to set temporary breakpoint like tbreak in
Gdb.

(lldb) help tbreak
   Set a one shot breakpoint using a regular expression to specify the location, where <linenum> is in decimal and <address> is in hex. This command takes 'raw' input (no need to quote stuff).

Syntax: _regexp-tbreak [<filename>:<linenum>]
_regexp-break [<linenum>]
_regexp-break [<address>]
_regexp-break <...>

'tbreak' is an abbreviation for '_regexp-tbreak'

For remote connection, I only find gdb-remote, which based
On manual is target remote. But I cannot find about how to
Use it and those matching control commands
target extended-remote

LLDB doesn't need to switch targets. To connect to a remote GDB server:

1 - launch remote GDB server

remote% debugserver local:1234 -- /bin/ls -lAF

2 - launch lldb and attach

local% lldb
(lldb) process connect --plugin gdb-remote connect://remote:1234

The command below is equivalent to the above command:

(lldb) gdb-remote remote:1234

"gdb-remote" is just a regex alias that will run "process connect".

disconnect

(lldb) process detach

monitor exit

I have no idea what this does.

set remote exec-file

This is where you want to use the python API, but you can do this via the "script" command line command. Lets say you have a local copy of "/bin/ls" for your remote system on your current machine at "/tmp/ls". When you launch lldb you would use the local copy:

% lldb
(lldb) target create --platform remote-macosx /tmp/ls

When you can set the remote path:

(lldb) script exe_module = lldb.target.FindModule(lldb.SBFileSpec('/tmp/ls', false)); exe_module.SetPlatformFileSpec(lldb.SBFileSpec('/bin/ls', False))

Hi Greg,

Thank you for explaining all those in great detail.

However, for working-dir, I still cannot get a solution to
work for my case.

What I need to do is something like this
Process launch --working-dir /tmp -Xxm100M

However, if I use process launch, -Xxm100M doesn't work
If I use run, -Xxm100M works but --working-dir doesn't work.

Is there any solution so far for this case?

Thanks,

Yin

Hi Greg,

Thank you for explaining all those in great detail.

However, for working-dir, I still cannot get a solution to
work for my case.

What I need to do is something like this
Process launch --working-dir /tmp -Xxm100M

terminate your process launch arguments with --:

(lldb) process launch --working-dir /tmp -- -Xxm100M

However, if I use process launch, -Xxm100M doesn't work
If I use run, -Xxm100M works but --working-dir doesn't work.

The run command doesn't work because 'run' is aliased to 'process launch -c /bin/bash --'

'run' is a GDB compatibility thing and people in GDB didn't have any options to "run" so any arguments that looked like options would just get passed though. "process launch" uses getopt_long() (as all command with options do) so the "process launch" command has its own options. You can terminate the options (see getopt_long man page) with "--". You will see this in _all_ LLDB commands that take options.