68 lines
1.4 KiB
Go
68 lines
1.4 KiB
Go
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// 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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"syscall"
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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 := syscall.MAP_SHARED
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prot := syscall.PROT_READ
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switch {
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case inprot© != 0:
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prot |= syscall.PROT_WRITE
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flags = syscall.MAP_PRIVATE
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case inprot&RDWR != 0:
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prot |= syscall.PROT_WRITE
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}
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if inprot&EXEC != 0 {
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prot |= syscall.PROT_EXEC
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}
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if inflags&ANON != 0 {
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flags |= syscall.MAP_ANON
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}
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b, err := syscall.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 flush(addr, len uintptr) error {
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_, _, errno := syscall.Syscall(_SYS_MSYNC, addr, len, _MS_SYNC)
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if errno != 0 {
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return syscall.Errno(errno)
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}
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return nil
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}
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func lock(addr, len uintptr) error {
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_, _, errno := syscall.Syscall(syscall.SYS_MLOCK, addr, len, 0)
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if errno != 0 {
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return syscall.Errno(errno)
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}
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return nil
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}
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func unlock(addr, len uintptr) error {
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_, _, errno := syscall.Syscall(syscall.SYS_MUNLOCK, addr, len, 0)
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if errno != 0 {
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return syscall.Errno(errno)
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}
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return nil
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}
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func unmap(addr, len uintptr) error {
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_, _, errno := syscall.Syscall(syscall.SYS_MUNMAP, addr, len, 0)
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if errno != 0 {
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return syscall.Errno(errno)
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}
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return nil
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}
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