/*
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* Copyright (C) 2016 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 "renderControl_enc.h"
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#include "qemu_pipe.h"
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#if PLATFORM_SDK_VERSION < 26
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#include <cutils/log.h>
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#else
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#include <log/log.h>
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#endif
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#include <pthread.h>
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#include <errno.h>
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static QEMU_PIPE_HANDLE sProcPipe = 0;
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static pthread_once_t sProcPipeOnce = PTHREAD_ONCE_INIT;
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// sProcUID is a unique ID per process assigned by the host.
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// It is different from getpid().
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static uint64_t sProcUID = 0;
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// processPipeInitOnce is used to generate a process unique ID (puid).
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// processPipeInitOnce will only be called at most once per process.
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// Use it with pthread_once for thread safety.
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// The host associates resources with process unique ID (puid) for memory cleanup.
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// It will fallback to the default path if the host does not support it.
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// Processes are identified by acquiring a per-process 64bit unique ID from the
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// host.
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static void processPipeInitOnce() {
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sProcPipe = qemu_pipe_open("GLProcessPipe");
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if (!qemu_pipe_valid(sProcPipe)) {
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sProcPipe = 0;
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ALOGW("Process pipe failed");
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return;
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}
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// Send a confirmation int to the host
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int32_t confirmInt = 100;
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ssize_t stat = 0;
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do {
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stat =
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qemu_pipe_write(sProcPipe, (const char*)&confirmInt,
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sizeof(confirmInt));
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} while (stat < 0 && errno == EINTR);
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if (stat != sizeof(confirmInt)) { // failed
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qemu_pipe_close(sProcPipe);
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sProcPipe = 0;
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ALOGW("Process pipe failed");
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return;
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}
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// Ask the host for per-process unique ID
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do {
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stat =
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qemu_pipe_read(sProcPipe, (char*)&sProcUID,
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sizeof(sProcUID));
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} while (stat < 0 && errno == EINTR);
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if (stat != sizeof(sProcUID)) {
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qemu_pipe_close(sProcPipe);
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sProcPipe = 0;
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sProcUID = 0;
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ALOGW("Process pipe failed");
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return;
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}
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}
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bool processPipeInit(renderControl_encoder_context_t *rcEnc) {
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pthread_once(&sProcPipeOnce, processPipeInitOnce);
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if (!sProcPipe) return false;
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rcEnc->rcSetPuid(rcEnc, sProcUID);
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return true;
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}
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