How to execute C++ program whenever a USB flash drive is inserted
Solution 1
For general use, If you would like to run your program for any USB storage. Use the driver for the rule match.
-
Add a
udev
rules filesudo nano /etc/udev/rules.d/90-detect-storage.rules
-
Add this rule
ACTION=="add", DRIVERS=="usb-storage", DRIVER=="sd", RUN+="/pathto/yourprogram"
If you want your program to distinguish the disks, so it runs different operations, use (you can pass its serial number or any attribute you like):
ACTION=="add", DRIVERS=="usb-storage", DRIVER=="sd", RUN+="/pathto/yourprogram $env{ID_VENDOR_ID} $env{ID_MODEL_ID}"
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Reload all rules
sudo udevadm control --reload-rules
Unplug and replug the flash drive
Notes:
-
I used this rule just to test which create a log when the rule is triggered:
ACTION=="add", DRIVERS=="usb-storage", DRIVER=="sd", RUN+="/bin/sh -c 'echo $env{ID_VENDOR_ID} $env{ID_MODEL_ID} >> /home/username/Desktop/usb-storage.log'"
You can comment the rules you don't want by adding
#
to the beginning of the line. Rules file can contain multiple rules.-
To check all the available
env
variables, use:ACTION=="add", DRIVERS=="usb-storage", RUN+="/bin/sh -c 'echo == >> /home/username/Desktop/usb-storage-env.log; env >> /home/username/Desktop/usb-storage-env.log'"
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To check for parameters to use for rule match, run:
sudo udevadm info --name=/dev/sdb1 --attribute-walk
References:
- Pass ATTR{idVendor} as argument in udev script
- Writing udev rules by Daniel Drake
Solution 2
You can use udev
to run an albitrary command. To make it work, create a rule in /etc/udev/rules.d/
:
sudo nano /etc/udev/rules.d/my-usb-device.rules
And enter:
ACTION=="add", ATTRS{idProduct}=="XXXX", ATTRS{idVendor}=="YYYY", RUN+="/location/of/my/command"
NOTE: The XXXX
and YYYY
values will be taken from lsusb
output.
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vinayawsm
Updated on September 18, 2022Comments
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vinayawsm over 1 year
I have a C++ program that accesses USB pen drives/flash drives. It works for currently inserted flash drive. A normal C++ program doesn't execute until we run it. But I wanted the program to run automatically whenever a flash drive is inserted. How can I do that?
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m. öztürk about 9 yearsI don't agree. The C++ program is a "command" after all. The user is asking for a solution to trigger that command. (He said: " But I wanted the program to run automatically whenever a flash drive is inserted. How could I do that?")
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vinayawsm about 9 years
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vinayawsm about 9 yearsFor letting my code trigger for every different pen drive, should I always update the "my-usb-device.rules" file?
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0x2b3bfa0 almost 9 years+150: Great answer: (AFAIK better than accepted) It makes a general rule for any USB device. In the acccepted answer the USB is restricted to a VID and a PID.