61 lines
2.1 KiB
C++
61 lines
2.1 KiB
C++
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/*
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* Copyright (C) 2006 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <unistd.h>
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#include <android_runtime/ActivityManager.h>
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#include <binder/IBinder.h>
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#include <binder/IServiceManager.h>
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#include <binder/Parcel.h>
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#include <utils/String8.h>
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namespace android {
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const uint32_t OPEN_CONTENT_URI_TRANSACTION = IBinder::FIRST_CALL_TRANSACTION + 4;
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// Perform ContentProvider.openFile() on the given URI, returning
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// the resulting native file descriptor. Returns < 0 on error.
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int openContentProviderFile(const String16& uri)
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{
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int fd = -1;
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sp<IServiceManager> sm = defaultServiceManager();
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sp<IBinder> am = sm->getService(String16("activity"));
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if (am != NULL) {
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Parcel data, reply;
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data.writeInterfaceToken(String16("android.app.IActivityManager"));
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data.writeString16(uri);
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status_t ret = am->transact(OPEN_CONTENT_URI_TRANSACTION, data, &reply);
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if (ret == NO_ERROR) {
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int32_t exceptionCode = reply.readExceptionCode();
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if (!exceptionCode) {
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// Success is indicated here by a nonzero int followed by the fd;
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// failure by a zero int with no data following.
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if (reply.readInt32() != 0) {
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fd = dup(reply.readFileDescriptor());
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}
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} else {
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// An exception was thrown back; fall through to return failure
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LOGD("openContentUri(%s) caught exception %d\n",
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String8(uri).string(), exceptionCode);
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}
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}
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}
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return fd;
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}
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} /* namespace android */
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