1 /* 2 * Copyright (C) 2016 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #include "renderControl_enc.h" 18 19 #include <cutils/log.h> 20 #include <pthread.h> 21 #include <hardware/qemu_pipe.h> 22 23 static int sProcPipe = 0; 24 static pthread_once_t sProcPipeOnce = PTHREAD_ONCE_INIT; 25 // sProcUID is a unique ID per process assigned by the host. 26 // It is different from getpid(). 27 static uint64_t sProcUID = 0; 28 29 // processPipeInitOnce is used to generate a process unique ID (puid). 30 // processPipeInitOnce will only be called at most once per process. 31 // Use it with pthread_once for thread safety. 32 // The host associates resources with process unique ID (puid) for memory cleanup. 33 // It will fallback to the default path if the host does not support it. 34 // Processes are identified by acquiring a per-process 64bit unique ID from the 35 // host. 36 static void processPipeInitOnce() { 37 sProcPipe = qemu_pipe_open("GLProcessPipe"); 38 if (sProcPipe < 0) { 39 sProcPipe = 0; 40 ALOGW("Process pipe failed"); 41 return; 42 } 43 // Send a confirmation int to the host 44 int32_t confirmInt = 100; 45 ssize_t stat = 0; 46 do { 47 stat = ::write(sProcPipe, (const char*)&confirmInt, 48 sizeof(confirmInt)); 49 } while (stat < 0 && errno == EINTR); 50 51 if (stat != sizeof(confirmInt)) { // failed 52 close(sProcPipe); 53 sProcPipe = 0; 54 ALOGW("Process pipe failed"); 55 return; 56 } 57 58 // Ask the host for per-process unique ID 59 do { 60 stat = ::read(sProcPipe, (char*)&sProcUID, 61 sizeof(sProcUID)); 62 } while (stat < 0 && errno == EINTR); 63 64 if (stat != sizeof(sProcUID)) { 65 close(sProcPipe); 66 sProcPipe = 0; 67 sProcUID = 0; 68 ALOGW("Process pipe failed"); 69 return; 70 } 71 } 72 73 bool processPipeInit(renderControl_encoder_context_t *rcEnc) { 74 pthread_once(&sProcPipeOnce, processPipeInitOnce); 75 if (!sProcPipe) return false; 76 rcEnc->rcSetPuid(rcEnc, sProcUID); 77 return true; 78 }