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vim /usr/src/linux-xyz/include/asm-generics/ioctl.h

#ifndef _IOC_NONE
# define _IOC_NONE      0U
#endif

#ifndef _IOC_WRITE
# define _IOC_WRITE     1U
#endif

#ifndef _IOC_READ
# define _IOC_READ      2U
#endif

please explain these lines of code>>!!

 

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