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// Copyright 2015 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.
package x11driver
import (
"syscall"
"unsafe"
)
// These constants are from /usr/include/linux/ipc.h
const (
ipcPrivate = 0
ipcCreat = 0x1000
ipcRmID = 0
)
func shmOpen(size int) (shmid uintptr, addr unsafe.Pointer, err error) {
shmid, _, errno0 := syscall.RawSyscall(syscall.SYS_SHMGET, ipcPrivate, uintptr(size), ipcCreat|0600)
if errno0 != 0 {
return 0, unsafe.Pointer(uintptr(0)), errno0
}
p, _, errno1 := syscall.RawSyscall(syscall.SYS_SHMAT, shmid, 0, 0)
_, _, errno2 := syscall.RawSyscall(syscall.SYS_SHMCTL, shmid, ipcRmID, 0)
if errno1 != 0 {
return 0, unsafe.Pointer(uintptr(0)), errno1
}
if errno2 != 0 {
return 0, unsafe.Pointer(uintptr(0)), errno2
}
return shmid, unsafe.Pointer(p), nil
}
func shmClose(p unsafe.Pointer) error {
_, _, errno := syscall.RawSyscall(syscall.SYS_SHMDT, uintptr(p), 0, 0)
if errno != 0 {
return errno
}
return nil
}
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