Do someone know what is the file /dev/dtracehelper?
What is supposed to do? How do we use it? where I can find some documentation on it?
Apple dtracehelper File – What It Is and How to Use It
catalinamacos
Related Solutions
I couldn't find that exact icon because I wasn't able to produce such a certificate file. If you can tell me where to find such a file, I might have better luck.
I was, however able to find a similar image. It's located at /System/Library/Frameworks/SecurityInterface.framework/Versions/A/Resources/CertLargeStd.png (at least for Mac OS 10.8.2) and it looks like this:
(CertLargeStd@2x.png is the one used on Retina screens.)
This is the image shown when you view a certificate in Keychain Access or Safari:
To find this image, I opened up the Safari panel above. I examined Safari's open files via Activity Monitor, and the image in question was there.
The preference goes in the com.google.Chrome.manifest file.
Open the manifest folder with the following Terminal command.
open /Applications/Google\ Chrome.app/Contents/Resources/com.google.Chrome.manifest/Contents/Resources/This presumes Google Chrome is in /Applications; adjust if necessary. Make sure to copy the entire line.
Open com.google.Chrome.manifest. I will use TextMate.
The AutoSelectCertificateForUrls preference goes on line 174.
Alternatively, use ⌘F to search for AutoSelectCertificateForUrls then select the
pfm_targetsarray.
Replace
user-managedwith your preference string, per the example in the link you gave.{\"pattern\":\"https://www.example.com\",\"filter\":{\"ISSUER\":{\"CN\":\"certificate issuer name\"}}}
Alternatively, you can use Workgroup Manager to set the preference.
Download and open Workgroup Manager.
Connect to localhost with an admin account.
Choose the User tab, and enter your username, then select your account.
Select Preferences in the toolbar, and choose the Details tab.
Add Google Chrome or Chromium to the list by clicking the + button and selecting the application bundle.
Double-click the application that you want to add the preference to, or click it and click the pencil
button.Click Always, then choose New Key.
Click New Item, and select Automatically select client certificates for these sites.
Click New Key.
Double-click the Value for 0.
Enter your desired preference string into the box and press enter.
Click Apply Now, then Done.
A managed
icon should appear next to the app that you added the preference to.
Best Answer
DTrace in general is a dynamic tracing framework that allows users to get information about the running system, including the user-space applications and the kernel.
The
/dev/dtracehelperfile is used to provider user-defined probes to dtrace. Essentially this means that an application can inform the dtrace system of events happening inside the application to provide high-level tracing capabilities for the user.I.e. instead of generic events like system calls or signals, it is possible for software such as for example a database engine to provide dtrace with information such as "SQL query started" or "Query plan computed" or what ever the application developer wants.
It is not "used" as such by ordinary users - you use it through the software you installed that then makes information available in dtrace through the helper device.
If you are a developer, I would suggest reading the following documentation on how to add application-specific probes to your program:
http://dtrace.org/guide/chp-usdt.html#chp-usdt
If you really want to manually access /dev/dtracehelper, I suggest looking at the source:
https://github.com/apple/darwin-xnu/blob/0a798f6738bc1db01281fc08ae024145e84df927/bsd/sys/dtrace.h
(line 1488 and onwards, also take a look at the corresponding .c file)
In particular you would want to initialize data structures such as dof_ioctl_data with dof_helper substructures, and use ioctl() with DTRACEHIOC_ADDDOF and others.
You can find an example of doing this here:
https://github.com/trentm/hello-json-logging/blob/master/node_modules/restify/node_modules/dtrace-provider/libusdt/usdt_dof_file.c