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authorDimitri Sokolyuk <demon@dim13.org>2018-09-08 11:22:31 +0200
committerDimitri Sokolyuk <demon@dim13.org>2018-09-08 11:22:31 +0200
commit886f6f54bba52ca2b5bc93bfd7de655d7d31ce53 (patch)
tree096a954a817b904d07b8e1654fdb61369366472b /vendor/golang.org/x/sys/unix/dev_aix_ppc64.go
parentcacf85e209091da8abe02c1f9e584047c8f531da (diff)
switch to go.mod
Diffstat (limited to 'vendor/golang.org/x/sys/unix/dev_aix_ppc64.go')
-rw-r--r--vendor/golang.org/x/sys/unix/dev_aix_ppc64.go39
1 files changed, 39 insertions, 0 deletions
diff --git a/vendor/golang.org/x/sys/unix/dev_aix_ppc64.go b/vendor/golang.org/x/sys/unix/dev_aix_ppc64.go
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+++ b/vendor/golang.org/x/sys/unix/dev_aix_ppc64.go
@@ -0,0 +1,39 @@
+// 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 ppc64
+
+// 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 & 0x3fffffff00000000) >> 32)
+}
+
+// Minor returns the minor component of a Linux device number.
+func Minor(dev uint64) uint32 {
+ return uint32((dev & 0x00000000ffffffff) >> 0)
+}
+
+// Mkdev returns a Linux device number generated from the given major and minor
+// components.
+func Mkdev(major, minor uint32) uint64 {
+ var DEVNO64 uint64
+ DEVNO64 = 0x8000000000000000
+ return ((uint64(major) << 32) | (uint64(minor) & 0x00000000FFFFFFFF) | DEVNO64)
+}