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
|
// Copyright 2016 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// +build linux
// +build 386 ppc64 ppc64le s390x
package x11driver
import (
"fmt"
"syscall"
"unsafe"
)
// These constants are from /usr/include/linux/ipc.h
const (
ipcPrivate = 0
ipcRmID = 0
shmAt = 21
shmDt = 22
shmGet = 23
shmCtl = 24
)
func shmOpen(size int) (shmid uintptr, addr unsafe.Pointer, err error) {
shmid, _, errno0 := syscall.RawSyscall6(syscall.SYS_IPC, shmGet, ipcPrivate, uintptr(size), 0600, 0, 0)
if errno0 != 0 {
return 0, unsafe.Pointer(uintptr(0)), fmt.Errorf("shmget: %v", errno0)
}
_, _, errno1 := syscall.RawSyscall6(syscall.SYS_IPC, shmAt, shmid, 0, uintptr(unsafe.Pointer(&addr)), 0, 0)
_, _, errno2 := syscall.RawSyscall6(syscall.SYS_IPC, shmCtl, shmid, ipcRmID, 0, 0, 0)
if errno1 != 0 {
return 0, unsafe.Pointer(uintptr(0)), fmt.Errorf("shmat: %v", errno1)
}
if errno2 != 0 {
return 0, unsafe.Pointer(uintptr(0)), fmt.Errorf("shmctl: %v", errno2)
}
return shmid, addr, nil
}
func shmClose(p unsafe.Pointer) error {
_, _, errno := syscall.RawSyscall6(syscall.SYS_IPC, shmDt, 0, 0, 0, uintptr(p), 0)
if errno != 0 {
return fmt.Errorf("shmdt: %v", errno)
}
return nil
}
|
