github.com/zhuohuang-hust/src-cbuild@v0.0.0-20230105071821-c7aab3e7c840/mergeCode/runc/libcontainer/devices/number.go (about)

     1  // +build linux freebsd
     2  
     3  package devices
     4  
     5  /*
     6  
     7  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.
     8  
     9  You can read what they are here:
    10  
    11   - http://www.makelinux.net/ldd3/chp-3-sect-2
    12   - http://www.linux-tutorial.info/modules.php?name=MContent&pageid=94
    13  
    14  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
    15  
    16  */
    17  
    18  func Major(devNumber int) int64 {
    19  	return int64((devNumber >> 8) & 0xfff)
    20  }
    21  
    22  func Minor(devNumber int) int64 {
    23  	return int64((devNumber & 0xff) | ((devNumber >> 12) & 0xfff00))
    24  }