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author | michaelbai@google.com <michaelbai@google.com@0039d316-1c4b-4281-b951-d872f2087c98> | 2011-06-21 16:14:47 +0000 |
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committer | michaelbai@google.com <michaelbai@google.com@0039d316-1c4b-4281-b951-d872f2087c98> | 2011-06-21 16:14:47 +0000 |
commit | 2a5b1a3e84402e80660d3511b5ffe343f98fe663 (patch) | |
tree | 200730e506221e7c2b411c592b2a37683ffe3773 /third_party/ashmem | |
parent | 3aa90ad5278b3e021dd4477bd0199dce6b2272ea (diff) | |
download | chromium_src-2a5b1a3e84402e80660d3511b5ffe343f98fe663.zip chromium_src-2a5b1a3e84402e80660d3511b5ffe343f98fe663.tar.gz chromium_src-2a5b1a3e84402e80660d3511b5ffe343f98fe663.tar.bz2 |
Added the ashmem library from Android
BUG=
TEST=
Review URL: http://codereview.chromium.org/7200011
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@89833 0039d316-1c4b-4281-b951-d872f2087c98
Diffstat (limited to 'third_party/ashmem')
-rw-r--r-- | third_party/ashmem/LICENSE | 202 | ||||
-rw-r--r-- | third_party/ashmem/README.chromium | 5 | ||||
-rw-r--r-- | third_party/ashmem/ashmem-dev.c | 90 | ||||
-rw-r--r-- | third_party/ashmem/ashmem.gyp | 16 | ||||
-rw-r--r-- | third_party/ashmem/ashmem.h | 45 |
5 files changed, 358 insertions, 0 deletions
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Only applies to OS_ANDROID. +Version: 7203eb2a8a29a7b721a48cd291700f38f3da1456 +Security Critical: yes diff --git a/third_party/ashmem/ashmem-dev.c b/third_party/ashmem/ashmem-dev.c new file mode 100644 index 0000000..1cfdfe0 --- /dev/null +++ b/third_party/ashmem/ashmem-dev.c @@ -0,0 +1,90 @@ +/* + * 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 "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); +} diff --git a/third_party/ashmem/ashmem.gyp b/third_party/ashmem/ashmem.gyp new file mode 100644 index 0000000..36e231f --- /dev/null +++ b/third_party/ashmem/ashmem.gyp @@ -0,0 +1,16 @@ +# Copyright (c) 2011 The Chromium Authors. All rights reserved. +# Use of this source code is governed by a BSD-style license that can be +# found in the LICENSE file. + +{ + 'targets': [ + { + 'target_name': 'ashmem', + 'type': 'static_library', + 'sources': [ + 'ashmem.h', + 'ashmem-dev.c' + ], + }, + ], +} diff --git a/third_party/ashmem/ashmem.h b/third_party/ashmem/ashmem.h new file mode 100644 index 0000000..708dd45 --- /dev/null +++ b/third_party/ashmem/ashmem.h @@ -0,0 +1,45 @@ +/* third_party/ashmem/ashmem.h + ** + ** Copyright 2008 The Android Open Source Project + ** + ** This file is dual licensed. It may be redistributed and/or modified + ** under the terms of the Apache 2.0 License OR version 2 of the GNU + ** General Public License. + */ + +#ifndef _THIRD_PARTY_ASHMEM_H +#define _THIRD_PARTY_ASHMEM_H + +#include <stddef.h> + +#ifdef __cplusplus +extern "C" { +#endif + +int ashmem_create_region(const char *name, size_t size); +int ashmem_set_prot_region(int fd, int prot); +int ashmem_pin_region(int fd, size_t offset, size_t len); +int ashmem_unpin_region(int fd, size_t offset, size_t len); +int ashmem_get_size_region(int fd); + +#ifdef __cplusplus +} +#endif + +#ifndef __ASHMEMIOC /* in case someone included <linux/ashmem.h> too */ + +#define ASHMEM_NAME_LEN 256 + +#define ASHMEM_NAME_DEF "dev/ashmem" + +/* Return values from ASHMEM_PIN: Was the mapping purged while unpinned? */ +#define ASHMEM_NOT_PURGED 0 +#define ASHMEM_WAS_PURGED 1 + +/* Return values from ASHMEM_UNPIN: Is the mapping now pinned or unpinned? */ +#define ASHMEM_IS_UNPINNED 0 +#define ASHMEM_IS_PINNED 1 + +#endif /* ! __ASHMEMIOC */ + +#endif /* _THIRD_PARTY_ASHMEM_H */ |