Identifyng device major and minor numbers


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This long listing includes columns showing major and minor numbers for each device.

The sd driver manages all of the devices listed in the previous example that have a major number of Minor numbers are listed after the comma. This file is maintained by the system and is undocumented. See All Related Store Items.


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To list the available major numbers for a system Use the command: haremajor -a 54, To reset the major number on a system You can reset the major number to an available number on a system. For example, to set the major number to 75 type: haremajor -s Prev Up Next Appendix J.

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Appendix J. Major number is a unique number which specifies a particular driver. When any application in user space open any device file , kernel check major number associated with that device file and identify which driver is responsible for handling this request.

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After that any subsequent calls for that particular device is passed to same driver. A single device driver can handle multiple devices or controllers. So whenever any request for such kind of devices comes to kernel , kernel has to differentiate between devices or controllers.

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To differentiate between devices , every device in linux system provided a unique number which is called minor device number. We can say that Minor number represents a device and major number specify a driver. From above image we can see a driver which has major number 4 is handling three devices device0, device1, device2 having minor number 3,4 and 5.


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identifyng device major and minor numbers Identifyng device major and minor numbers
identifyng device major and minor numbers Identifyng device major and minor numbers
identifyng device major and minor numbers Identifyng device major and minor numbers
identifyng device major and minor numbers Identifyng device major and minor numbers
identifyng device major and minor numbers Identifyng device major and minor numbers
identifyng device major and minor numbers Identifyng device major and minor numbers
identifyng device major and minor numbers Identifyng device major and minor numbers
identifyng device major and minor numbers Identifyng device major and minor numbers
Identifyng device major and minor numbers

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