Messages in this thread | | | Date | Sat, 24 Feb 2007 13:45:16 -0500 | From | Kyle McMartin <> | Subject | Re: why is asm-parisc/ioctl.h subtly different from asm-generic/ioctl.h? |
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On Sat, Feb 24, 2007 at 05:34:15AM -0500, Robert P. J. Day wrote: > > just noticed that parisc's ioctl.h file, rather than simply > including asm-generic/ioctl.h, has its own copy whose sole > (meaningful) difference from the generic one is: > > $ diff include/{asm-generic,asm-parisc}/ioctl.h > ... > 41,42c54,55 > < #define _IOC_WRITE 1U > < #define _IOC_READ 2U > --- > > #define _IOC_WRITE 2U > > #define _IOC_READ 1U > > so parisc is identical except that it switches the meaning of the > direction field? is there a reason for this? just curious. >
HP-UX compatibility.
#define IOC_OUT 0x40000000 #define IOC_IN (int)0x80000000
PS: It would be wise to ask questions on the pertinent mailing lists...
--Kyle - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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