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