38 lines
1.6 KiB
Go
38 lines
1.6 KiB
Go
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// Copyright (c) Huawei Technologies Co., Ltd. 2018-2019. All rights reserved.
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// isulad-tools is licensed under the Mulan PSL v1.
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// You can use this software according to the terms and conditions of the Mulan PSL v1.
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// You may obtain a copy of Mulan PSL v1 at:
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// http://license.coscl.org.cn/MulanPSL
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// THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND, EITHER EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT, MERCHANTABILITY OR FIT FOR A PARTICULAR
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// PURPOSE.
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// See the Mulan PSL v1 for more details.
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// Description: parse device major and minor number
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// Author: zhangwei
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// Create: 2018-01-18
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package libdevice
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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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// Major returns the major number of a device
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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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// Minor returns the minor number of a device
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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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