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PATH="$PATH:/home/zhengb66/bin"
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time(&now);
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How to write a Linux driver

1. wrote driver function file(s) .
2. stored in the proper folder, eg: character driver stored in folder  drivers/char/
3. modified Makefile in this folder(eg: drivers/char/)
        -added configuration at somewhere: type like that "obj-$(CONFIG_TESTD ......

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