linux_device_fasync driver can not communicate directly with the application, asynchronous communication can be used to read data, so applications do not have to query the device state, when the data arrives, it will take the initiative to inform

1-8fasync\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
1-8fasync

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