91 lines
2.1 KiB
C
91 lines
2.1 KiB
C
/*
|
|
* Copyright (C) 2008 The Android Open Source Project
|
|
*
|
|
* Licensed under the Apache License, Version 2.0 (the "License");
|
|
* you may not use this file except in compliance with the License.
|
|
* You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS,
|
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
* See the License for the specific language governing permissions and
|
|
* limitations under the License.
|
|
*/
|
|
|
|
/*
|
|
* Implementation of the user-space ashmem API for devices, which have our
|
|
* ashmem-enabled kernel. See ashmem-sim.c for the "fake" tmp-based version,
|
|
* used by the simulator.
|
|
*/
|
|
|
|
#include <unistd.h>
|
|
#include <string.h>
|
|
#include <sys/types.h>
|
|
#include <sys/stat.h>
|
|
#include <sys/ioctl.h>
|
|
#include <fcntl.h>
|
|
|
|
#include <linux/ashmem.h>
|
|
#include <cutils/ashmem.h>
|
|
|
|
#define ASHMEM_DEVICE "/dev/ashmem"
|
|
|
|
/*
|
|
* ashmem_create_region - creates a new ashmem region and returns the file
|
|
* descriptor, or <0 on error
|
|
*
|
|
* `name' is an optional label to give the region (visible in /proc/pid/maps)
|
|
* `size' is the size of the region, in page-aligned bytes
|
|
*/
|
|
int ashmem_create_region(const char *name, size_t size)
|
|
{
|
|
int fd, ret;
|
|
|
|
fd = open(ASHMEM_DEVICE, O_RDWR);
|
|
if (fd < 0)
|
|
return fd;
|
|
|
|
if (name) {
|
|
char buf[ASHMEM_NAME_LEN];
|
|
|
|
strlcpy(buf, name, sizeof(buf));
|
|
ret = ioctl(fd, ASHMEM_SET_NAME, buf);
|
|
if (ret < 0)
|
|
goto error;
|
|
}
|
|
|
|
ret = ioctl(fd, ASHMEM_SET_SIZE, size);
|
|
if (ret < 0)
|
|
goto error;
|
|
|
|
return fd;
|
|
|
|
error:
|
|
close(fd);
|
|
return ret;
|
|
}
|
|
|
|
int ashmem_set_prot_region(int fd, int prot)
|
|
{
|
|
return ioctl(fd, ASHMEM_SET_PROT_MASK, prot);
|
|
}
|
|
|
|
int ashmem_pin_region(int fd, size_t offset, size_t len)
|
|
{
|
|
struct ashmem_pin pin = { offset, len };
|
|
return ioctl(fd, ASHMEM_PIN, &pin);
|
|
}
|
|
|
|
int ashmem_unpin_region(int fd, size_t offset, size_t len)
|
|
{
|
|
struct ashmem_pin pin = { offset, len };
|
|
return ioctl(fd, ASHMEM_UNPIN, &pin);
|
|
}
|
|
|
|
int ashmem_get_size_region(int fd)
|
|
{
|
|
return ioctl(fd, ASHMEM_GET_SIZE, NULL);
|
|
}
|