mirror of https://github.com/hslam/ftok.git
22 lines
756 B
Go
22 lines
756 B
Go
// Copyright (c) 2020 Meng Huang (mhboy@outlook.com)
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// This package is licensed under a MIT license that can be found in the LICENSE file.
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// Package ftok provides a way to generate a System V IPC key, suitable for use with
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// msgget, semget, or shmget.
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package ftok
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import (
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"syscall"
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)
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// Ftok uses the given pathname (which must refer to an existing, accessible file) and
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// the least significant 8 bits of proj_id (which must be nonzero) to generate
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// a key_t type System V IPC key.
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func Ftok(pathname string, projectid uint8) (int, error) {
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var stat = syscall.Stat_t{}
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if err := syscall.Stat(pathname, &stat); err != nil {
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return 0, err
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}
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return int(uint(projectid&0xff)<<24 | uint((stat.Dev&0xff)<<16) | (uint(stat.Ino) & 0xffff)), nil
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}
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