Writing a driver file is generated when a name1.ko file, name1 is the name of the driver, after using insmod name1.ko instruction, use lsmod can see the drive named name1
When an incoming call alloc_chrdev_region function or function register_chrdev_region last parameter is the name of the device, if the incoming is name2, it indicates that the device is named name2, use cat / proc / devices command can see the device name
Files using mknod command to specify the name of the device file name, the name is opened using the open function