1// Copyright 2016 The Go Authors. All rights reserved. 2// Use of this source code is governed by a BSD-style 3// license that can be found in the LICENSE file. 4 5// +build linux 6// +build 386 ppc64 ppc64le s390x 7 8package x11driver 9 10import ( 11 "fmt" 12 "syscall" 13 "unsafe" 14) 15 16// These constants are from /usr/include/linux/ipc.h 17const ( 18 ipcPrivate = 0 19 ipcRmID = 0 20 21 shmAt = 21 22 shmDt = 22 23 shmGet = 23 24 shmCtl = 24 25) 26 27func shmOpen(size int) (shmid uintptr, addr unsafe.Pointer, err error) { 28 shmid, _, errno0 := syscall.RawSyscall6(syscall.SYS_IPC, shmGet, ipcPrivate, uintptr(size), 0600, 0, 0) 29 if errno0 != 0 { 30 return 0, unsafe.Pointer(uintptr(0)), fmt.Errorf("shmget: %v", errno0) 31 } 32 _, _, errno1 := syscall.RawSyscall6(syscall.SYS_IPC, shmAt, shmid, 0, uintptr(unsafe.Pointer(&addr)), 0, 0) 33 _, _, errno2 := syscall.RawSyscall6(syscall.SYS_IPC, shmCtl, shmid, ipcRmID, 0, 0, 0) 34 if errno1 != 0 { 35 return 0, unsafe.Pointer(uintptr(0)), fmt.Errorf("shmat: %v", errno1) 36 } 37 if errno2 != 0 { 38 return 0, unsafe.Pointer(uintptr(0)), fmt.Errorf("shmctl: %v", errno2) 39 } 40 return shmid, addr, nil 41} 42 43func shmClose(p unsafe.Pointer) error { 44 _, _, errno := syscall.RawSyscall6(syscall.SYS_IPC, shmDt, 0, 0, 0, uintptr(p), 0) 45 if errno != 0 { 46 return fmt.Errorf("shmdt: %v", errno) 47 } 48 return nil 49} 50