golang dev_linux 代码
文件路径：/src/cmd/vendor/golang.org/x/sys/unix/dev_linux.go
/ Copyright 2017 The Go Authors. All rights reserved.
/ Use of this source code is governed by a BSD-style
/ license that can be found in the LICENSE file.
/ Functions to access/create device major and minor numbers matching the
/ encoding used by the Linux kernel and glibc.
/
/ The information below is extracted and adapted from bits/sysmacros.h in the
/ glibc sources:
/
/ dev_t in glibc is 64-bit, with 32-bit major and minor numbers. glibc's
/ default encoding is MMMM Mmmm mmmM MMmm, where M is a hex digit of the major
/ number and m is a hex digit of the minor number. This is backward compatible
/ with legacy systems where dev_t is 16 bits wide, encoded as MMmm. It is also
/ backward compatible with the Linux kernel, which for some architectures uses
/ 32-bit dev_t, encoded as mmmM MMmm.
package unix
/ Major returns the major component of a Linux device number.
func Major(dev uint64) uint32 {
major := uint32((dev & 0x00000000000fff00) >> 8)
major |= uint32((dev & 0xfffff00000000000) >> 32)
return major
}
/ Minor returns the minor component of a Linux device number.
func Minor(dev uint64) uint32 {
minor := uint32((dev & 0x00000000000000ff) >> 0)
minor |= uint32((dev & 0x00000ffffff00000) >> 12)
return minor
}
/ Mkdev returns a Linux device number generated from the given major and minor
/ components.
func Mkdev(major, minor uint32) uint64 {
dev := (uint64(major) & 0x00000fff) << 8
dev |= (uint64(major) & 0xfffff000) << 32
dev |= (uint64(minor) & 0x000000ff) << 0
dev |= (uint64(minor) & 0xffffff00) << 12
return dev
}