Mknod kernel space solution - Silicon Valley Gazette

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Over the past few weeks, some of our users have told us that they have experimented with the mknod kernel space.

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No, your company cannot use mknod and rm-cli memory outside of kernel memory. These are bash statements. However, there is another way to create an enterprise module kernel device node file and remove it from space. In a partial initialization function, you can use class_create () and then just use device_create () after the functions that register for a single device. After calling cdev_init (), you can include these two functions as an introduction to the node file. Similarly, you can use the device_destroy () and class_destroy () functions in the module_exit function to get rid of the node.

Here is some sample code generated by / dev / kmem in the device initialization function char:

  int majorNum;dev_t devNr; // 32-bit combined major and minor device numbersstruct * pClass structure; // class_create will select thisstatic int __init devkoInit (void)  auxiliary structure * pDev;  // Save the drawing device  majorNum = register_chrdev (0, "devko", & fileOps);  whether or not  (majorNum <0)    printk (KERN_ALERT "Device cannot be registered:% d  n", majorNum);    return MajorNum;    devNo = MKDEV (majorNum, 0); // create dev_t, 32-bit version numbered  // Create / sys / class / kmem so we can create / dev / kmem  pClass means class_create (THIS_MODULE, "kmem");  if (IS_ERR (pKlasse))    printk (KERN_WARNING " n cannot create class");    unregister_chrdev_region (devNo, 1);   go -1;    // Create / dev / kmem for this developer character  and if (IS_ERR (pDev = device_create (pClass, NULL, devNo, NULL, "kmem")))    printk (KERN_WARNING "devko.ko cannot exit from device / dev / kmem  n");    class_destroy (pClass);    unregister_chrdev_region (devNo, 1);    reunite -1;    Exchange 0; // end devkoInitstatic void __exit devkoExit (void)  // Remove when done  device_destroy (pClass, devNo); // Delete this / dev / kmem  class_destroy (pClass); // class / system / class / kmem. delete  unregister_chrdev (majorNum, DEVICE_NAME); // Unregister the device // end devkoExit

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