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51 lines
1019 B
51 lines
1019 B
// Copyright 2011 Evan Shaw. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// +build darwin dragonfly freebsd linux openbsd solaris netbsd
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package mmap
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import (
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"golang.org/x/sys/unix"
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)
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func mmap(len int, inprot, inflags, fd uintptr, off int64) ([]byte, error) {
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flags := unix.MAP_SHARED
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prot := unix.PROT_READ
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switch {
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case inprot© != 0:
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prot |= unix.PROT_WRITE
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flags = unix.MAP_PRIVATE
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case inprot&RDWR != 0:
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prot |= unix.PROT_WRITE
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}
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if inprot&EXEC != 0 {
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prot |= unix.PROT_EXEC
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}
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if inflags&ANON != 0 {
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flags |= unix.MAP_ANON
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}
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b, err := unix.Mmap(int(fd), off, len, prot, flags)
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if err != nil {
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return nil, err
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}
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return b, nil
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}
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func (m MMap) flush() error {
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return unix.Msync([]byte(m), unix.MS_SYNC)
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}
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func (m MMap) lock() error {
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return unix.Mlock([]byte(m))
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}
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func (m MMap) unlock() error {
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return unix.Munlock([]byte(m))
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}
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func (m MMap) unmap() error {
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return unix.Munmap([]byte(m))
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}
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