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