27 lines
1,022 B
Go
27 lines
1,022 B
Go
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package devices
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/*
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This code provides support for manipulating linux device numbers. It should be replaced by normal syscall functions once http://code.google.com/p/go/issues/detail?id=8106 is solved.
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You can read what they are here:
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- http://www.makelinux.net/ldd3/chp-3-sect-2
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- http://www.linux-tutorial.info/modules.php?name=MContent&pageid=94
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Note! These are NOT the same as the MAJOR(dev_t device);, MINOR(dev_t device); and MKDEV(int major, int minor); functions as defined in <linux/kdev_t.h> as the representation of device numbers used by go is different than the one used internally to the kernel! - https://github.com/torvalds/linux/blob/master/include/linux/kdev_t.h#L9
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*/
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func Major(devNumber int) int64 {
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return int64((devNumber >> 8) & 0xfff)
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}
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func Minor(devNumber int) int64 {
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return int64((devNumber & 0xff) | ((devNumber >> 12) & 0xfff00))
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}
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func Mkdev(majorNumber int64, minorNumber int64) int {
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return int((majorNumber << 8) | (minorNumber & 0xff) | ((minorNumber & 0xfff00) << 12))
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}
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