blob: 25b13e51fdffde79e77c4ee12c0031e02b869caa (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
|
// 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© != 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))
}
|
