Description: register_chrdev register character device example, prompts to load the module, the need to establish the appropriate file mknod node in the test program test execution
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1-3register_chrdev\demo\.demo.ko.cmd
..................\....\.demo.mod.o.cmd
..................\....\.demo.o.cmd
..................\....\.tmp_versions\demo.mod
..................\....\demo.c
..................\....\demo.h
..................\....\demo.ko
..................\....\demo.mod.c
..................\....\demo.mod.o
..................\....\demo.o
..................\....\Module.symvers
..................\....\modules.order
..................\test\test
..................\....\test.c
..................\demo\.tmp_versions
..................\demo
..................\test
1-3register_chrdev