Starting 2 instances of Chrome in separate tabs (Linux)

[Brandon Chong]

Hello, I'm using Ubuntu 20.04. I was doing some testing on what happens when you run 2 separate browser instances. The later one would recognize there is an existing browser session and merge into the earlier browser instance as a separate window, but I'm not too sure as to how this happens/what data is passed to the first browser instance. Could anyone enlighten me on this?

Steps to reproduce:
1. Open Terminal, and create 2 separate tabs
2. In each tab, navigate to folder containing chrome executable
3. In each tab, run ./chrome --user-data-dir="/tmp/test/" to a separate chrome instance

TIA!

[Jeremy Roman]

We have a "singleton lock" (on Linux, a Unix socket in your profile directory) that allows us to contact the other process, if it hasn't hung. It receives the working directory path and command line of the current process.

It's sent here

https://source.chromium.org/chromium/chromium/src/+/master:chrome/browser/chrome_browser_main.cc;l=1226-1265;drc=10ccc0cd6b6075b5440663a7f3df959643ab7850

https://source.chromium.org/chromium/chromium/src/+/master:chrome/browser/process_singleton_posix.cc;l=829-852;drc=451d3dbd181c2c4d2b89e69373819b980261ddab

and received here

https://source.chromium.org/chromium/chromium/src/+/master:chrome/browser/chrome_browser_main.cc;l=439-485;drc=451d3dbd181c2c4d2b89e69373819b980261ddab

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