// Copyright 2018 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. // +build aix // +build ppc // 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 { return uint32((dev >> 16) & 0xffff) } // Minor returns the minor component of a Linux device number. func Minor(dev uint64) uint32 { return uint32(dev & 0xffff) } // Mkdev returns a Linux device number generated from the given major and minor // components. func Mkdev(major, minor uint32) uint64 { return uint64(((major) << 16) | (minor)) }