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
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
|
// 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 (
"syscall"
)
func mmap(len int, inprot, inflags, fd uintptr, off int64) ([]byte, error) {
flags := syscall.MAP_SHARED
prot := syscall.PROT_READ
switch {
case inprot© != 0:
prot |= syscall.PROT_WRITE
flags = syscall.MAP_PRIVATE
case inprot&RDWR != 0:
prot |= syscall.PROT_WRITE
}
if inprot&EXEC != 0 {
prot |= syscall.PROT_EXEC
}
if inflags&ANON != 0 {
flags |= syscall.MAP_ANON
}
b, err := syscall.Mmap(int(fd), off, len, prot, flags)
if err != nil {
return nil, err
}
return b, nil
}
func flush(addr, len uintptr) error {
_, _, errno := syscall.Syscall(_SYS_MSYNC, addr, len, _MS_SYNC)
if errno != 0 {
return syscall.Errno(errno)
}
return nil
}
func lock(addr, len uintptr) error {
_, _, errno := syscall.Syscall(syscall.SYS_MLOCK, addr, len, 0)
if errno != 0 {
return syscall.Errno(errno)
}
return nil
}
func unlock(addr, len uintptr) error {
_, _, errno := syscall.Syscall(syscall.SYS_MUNLOCK, addr, len, 0)
if errno != 0 {
return syscall.Errno(errno)
}
return nil
}
func unmap(addr, len uintptr) error {
_, _, errno := syscall.Syscall(syscall.SYS_MUNMAP, addr, len, 0)
if errno != 0 {
return syscall.Errno(errno)
}
return nil
}
|
