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_IOC_RESVBITS13include/asm-sparc/ioctl.h#define _IOC_RESVMASK    ((1 << _IOC_RESVBITS)-1)
_IOC_RESVBITS21include/asm-sparc/ioctl.h#define _IOC_DIRSHIFT    (_IOC_RESVSHIFT + _IOC_RESVBITS)