19066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project/* 29066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Copyright (C) 2008 The Android Open Source Project 39066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 49066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Licensed under the Apache License, Version 2.0 (the "License"); 59066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * you may not use this file except in compliance with the License. 69066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * You may obtain a copy of the License at 79066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 89066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * http://www.apache.org/licenses/LICENSE-2.0 99066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Unless required by applicable law or agreed to in writing, software 119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * distributed under the License is distributed on an "AS IS" BASIS, 129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * See the License for the specific language governing permissions and 149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * limitations under the License. 159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project#define LOG_TAG "MemoryFile" 189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project#include <utils/Log.h> 199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project#include <cutils/ashmem.h> 219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project#include <android_runtime/AndroidRuntime.h> 229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project#include "JNIHelp.h" 239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project#include <unistd.h> 249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project#include <sys/mman.h> 259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectnamespace android { 289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 29761e0918d30b6a3f292625b44b86dffd1538bc78Bjorn Bringertstatic jobject android_os_MemoryFile_open(JNIEnv* env, jobject clazz, jstring name, jint length) 309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project{ 319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project const char* namestr = (name ? env->GetStringUTFChars(name, NULL) : NULL); 329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int result = ashmem_create_region(namestr, length); 349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (name) 369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project env->ReleaseStringUTFChars(name, namestr); 379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 38761e0918d30b6a3f292625b44b86dffd1538bc78Bjorn Bringert if (result < 0) { 399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project jniThrowException(env, "java/io/IOException", "ashmem_create_region failed"); 40963cd006c45716b034f656bf7e7179e6476f7e4dBjorn Bringert return NULL; 41761e0918d30b6a3f292625b44b86dffd1538bc78Bjorn Bringert } 42761e0918d30b6a3f292625b44b86dffd1538bc78Bjorn Bringert 43761e0918d30b6a3f292625b44b86dffd1538bc78Bjorn Bringert return jniCreateFileDescriptor(env, result); 449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project} 459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 46c20cadbdad0cdfe8e56431c22bd26ae666101e89Ashok Bhatstatic jlong android_os_MemoryFile_mmap(JNIEnv* env, jobject clazz, jobject fileDescriptor, 47963cd006c45716b034f656bf7e7179e6476f7e4dBjorn Bringert jint length, jint prot) 489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project{ 49761e0918d30b6a3f292625b44b86dffd1538bc78Bjorn Bringert int fd = jniGetFDFromFileDescriptor(env, fileDescriptor); 506ffb09171960e776466b963e51196565a033998cNarayan Kamath void* result = mmap(NULL, length, prot, MAP_SHARED, fd, 0); 516ffb09171960e776466b963e51196565a033998cNarayan Kamath if (result == MAP_FAILED) { 529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project jniThrowException(env, "java/io/IOException", "mmap failed"); 536ffb09171960e776466b963e51196565a033998cNarayan Kamath } 546ffb09171960e776466b963e51196565a033998cNarayan Kamath return reinterpret_cast<jlong>(result); 559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project} 569066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 57c20cadbdad0cdfe8e56431c22bd26ae666101e89Ashok Bhatstatic void android_os_MemoryFile_munmap(JNIEnv* env, jobject clazz, jlong addr, jint length) 589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project{ 596ffb09171960e776466b963e51196565a033998cNarayan Kamath int result = munmap(reinterpret_cast<void *>(addr), length); 60761e0918d30b6a3f292625b44b86dffd1538bc78Bjorn Bringert if (result < 0) 61761e0918d30b6a3f292625b44b86dffd1538bc78Bjorn Bringert jniThrowException(env, "java/io/IOException", "munmap failed"); 62761e0918d30b6a3f292625b44b86dffd1538bc78Bjorn Bringert} 63761e0918d30b6a3f292625b44b86dffd1538bc78Bjorn Bringert 64761e0918d30b6a3f292625b44b86dffd1538bc78Bjorn Bringertstatic void android_os_MemoryFile_close(JNIEnv* env, jobject clazz, jobject fileDescriptor) 65761e0918d30b6a3f292625b44b86dffd1538bc78Bjorn Bringert{ 66761e0918d30b6a3f292625b44b86dffd1538bc78Bjorn Bringert int fd = jniGetFDFromFileDescriptor(env, fileDescriptor); 67761e0918d30b6a3f292625b44b86dffd1538bc78Bjorn Bringert if (fd >= 0) { 68761e0918d30b6a3f292625b44b86dffd1538bc78Bjorn Bringert jniSetFileDescriptorOfFD(env, fileDescriptor, -1); 69761e0918d30b6a3f292625b44b86dffd1538bc78Bjorn Bringert close(fd); 70761e0918d30b6a3f292625b44b86dffd1538bc78Bjorn Bringert } 719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project} 729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectstatic jint android_os_MemoryFile_read(JNIEnv* env, jobject clazz, 74c20cadbdad0cdfe8e56431c22bd26ae666101e89Ashok Bhat jobject fileDescriptor, jlong address, jbyteArray buffer, jint srcOffset, jint destOffset, 759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project jint count, jboolean unpinned) 769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project{ 77761e0918d30b6a3f292625b44b86dffd1538bc78Bjorn Bringert int fd = jniGetFDFromFileDescriptor(env, fileDescriptor); 789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (unpinned && ashmem_pin_region(fd, 0, 0) == ASHMEM_WAS_PURGED) { 799066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project ashmem_unpin_region(fd, 0, 0); 809066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project jniThrowException(env, "java/io/IOException", "ashmem region was purged"); 819066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return -1; 829066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 839066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 84ad984f19339008f7eb8687aecc1779be70bc1f65Bjorn Bringert env->SetByteArrayRegion(buffer, destOffset, count, (const jbyte *)address + srcOffset); 859066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 869066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (unpinned) { 879066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project ashmem_unpin_region(fd, 0, 0); 889066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 899066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return count; 909066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project} 919066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 929066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectstatic jint android_os_MemoryFile_write(JNIEnv* env, jobject clazz, 93c20cadbdad0cdfe8e56431c22bd26ae666101e89Ashok Bhat jobject fileDescriptor, jlong address, jbyteArray buffer, jint srcOffset, jint destOffset, 949066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project jint count, jboolean unpinned) 959066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project{ 96761e0918d30b6a3f292625b44b86dffd1538bc78Bjorn Bringert int fd = jniGetFDFromFileDescriptor(env, fileDescriptor); 979066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (unpinned && ashmem_pin_region(fd, 0, 0) == ASHMEM_WAS_PURGED) { 989066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project ashmem_unpin_region(fd, 0, 0); 999066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project jniThrowException(env, "java/io/IOException", "ashmem region was purged"); 1009066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return -1; 1019066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1029066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 103ad984f19339008f7eb8687aecc1779be70bc1f65Bjorn Bringert env->GetByteArrayRegion(buffer, srcOffset, count, (jbyte *)address + destOffset); 1049066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1059066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (unpinned) { 1069066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project ashmem_unpin_region(fd, 0, 0); 1079066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1089066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return count; 1099066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project} 1109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 111761e0918d30b6a3f292625b44b86dffd1538bc78Bjorn Bringertstatic void android_os_MemoryFile_pin(JNIEnv* env, jobject clazz, jobject fileDescriptor, jboolean pin) 1129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project{ 113761e0918d30b6a3f292625b44b86dffd1538bc78Bjorn Bringert int fd = jniGetFDFromFileDescriptor(env, fileDescriptor); 1149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int result = (pin ? ashmem_pin_region(fd, 0, 0) : ashmem_unpin_region(fd, 0, 0)); 1159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (result < 0) { 1169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project jniThrowException(env, "java/io/IOException", NULL); 1179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project} 1199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1207bcbd511731e13b9f2778e6aa6c633417d266f5eMarco Nelissenstatic jint android_os_MemoryFile_get_size(JNIEnv* env, jobject clazz, 121963cd006c45716b034f656bf7e7179e6476f7e4dBjorn Bringert jobject fileDescriptor) { 122963cd006c45716b034f656bf7e7179e6476f7e4dBjorn Bringert int fd = jniGetFDFromFileDescriptor(env, fileDescriptor); 123963cd006c45716b034f656bf7e7179e6476f7e4dBjorn Bringert // Use ASHMEM_GET_SIZE to find out if the fd refers to an ashmem region. 124963cd006c45716b034f656bf7e7179e6476f7e4dBjorn Bringert // ASHMEM_GET_SIZE should succeed for all ashmem regions, and the kernel 125963cd006c45716b034f656bf7e7179e6476f7e4dBjorn Bringert // should return ENOTTY for all other valid file descriptors 126963cd006c45716b034f656bf7e7179e6476f7e4dBjorn Bringert int result = ashmem_get_size_region(fd); 127963cd006c45716b034f656bf7e7179e6476f7e4dBjorn Bringert if (result < 0) { 128963cd006c45716b034f656bf7e7179e6476f7e4dBjorn Bringert if (errno == ENOTTY) { 129963cd006c45716b034f656bf7e7179e6476f7e4dBjorn Bringert // ENOTTY means that the ioctl does not apply to this object, 130963cd006c45716b034f656bf7e7179e6476f7e4dBjorn Bringert // i.e., it is not an ashmem region. 131ec100900e63a8374ac010e7131d9c7e54c5e6984Marco Nelissen return (jint) -1; 132963cd006c45716b034f656bf7e7179e6476f7e4dBjorn Bringert } 133963cd006c45716b034f656bf7e7179e6476f7e4dBjorn Bringert // Some other error, throw exception 134963cd006c45716b034f656bf7e7179e6476f7e4dBjorn Bringert jniThrowIOException(env, errno); 135ec100900e63a8374ac010e7131d9c7e54c5e6984Marco Nelissen return (jint) -1; 136963cd006c45716b034f656bf7e7179e6476f7e4dBjorn Bringert } 137ec100900e63a8374ac010e7131d9c7e54c5e6984Marco Nelissen return (jint) result; 138963cd006c45716b034f656bf7e7179e6476f7e4dBjorn Bringert} 139963cd006c45716b034f656bf7e7179e6476f7e4dBjorn Bringert 1409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectstatic const JNINativeMethod methods[] = { 141761e0918d30b6a3f292625b44b86dffd1538bc78Bjorn Bringert {"native_open", "(Ljava/lang/String;I)Ljava/io/FileDescriptor;", (void*)android_os_MemoryFile_open}, 142c20cadbdad0cdfe8e56431c22bd26ae666101e89Ashok Bhat {"native_mmap", "(Ljava/io/FileDescriptor;II)J", (void*)android_os_MemoryFile_mmap}, 143c20cadbdad0cdfe8e56431c22bd26ae666101e89Ashok Bhat {"native_munmap", "(JI)V", (void*)android_os_MemoryFile_munmap}, 144761e0918d30b6a3f292625b44b86dffd1538bc78Bjorn Bringert {"native_close", "(Ljava/io/FileDescriptor;)V", (void*)android_os_MemoryFile_close}, 145c20cadbdad0cdfe8e56431c22bd26ae666101e89Ashok Bhat {"native_read", "(Ljava/io/FileDescriptor;J[BIIIZ)I", (void*)android_os_MemoryFile_read}, 146c20cadbdad0cdfe8e56431c22bd26ae666101e89Ashok Bhat {"native_write", "(Ljava/io/FileDescriptor;J[BIIIZ)V", (void*)android_os_MemoryFile_write}, 147761e0918d30b6a3f292625b44b86dffd1538bc78Bjorn Bringert {"native_pin", "(Ljava/io/FileDescriptor;Z)V", (void*)android_os_MemoryFile_pin}, 1487bcbd511731e13b9f2778e6aa6c633417d266f5eMarco Nelissen {"native_get_size", "(Ljava/io/FileDescriptor;)I", 1497bcbd511731e13b9f2778e6aa6c633417d266f5eMarco Nelissen (void*)android_os_MemoryFile_get_size} 1509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project}; 1519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectint register_android_os_MemoryFile(JNIEnv* env) 1539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project{ 1549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return AndroidRuntime::registerNativeMethods( 155dd66bcbf9d6ef0c50a18d9c4b1b39ce7ef7afcc4Elliott Hughes env, "android/os/MemoryFile", 1569066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project methods, NELEM(methods)); 1579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project} 1589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project} 160