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      1 /*
      2  * Copyright (C) 2011 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 "rsFifoSocket.h"
     18 
     19 #include <stdio.h>
     20 #include <stdlib.h>
     21 #include <ctype.h>
     22 #include <unistd.h>
     23 #include <poll.h>
     24 #include <sys/types.h>
     25 #include <sys/socket.h>
     26 
     27 namespace android {
     28 namespace renderscript {
     29 
     30 FifoSocket::FifoSocket() {
     31     mShutdown = false;
     32 }
     33 
     34 FifoSocket::~FifoSocket() {
     35 
     36 }
     37 
     38 bool FifoSocket::init(bool supportNonBlocking, bool supportReturnValues, size_t maxDataSize) {
     39     int ret = socketpair(AF_UNIX, SOCK_STREAM, 0, sv);
     40     return (ret == 0);
     41 }
     42 
     43 void FifoSocket::shutdown() {
     44     mShutdown = true;
     45     uint64_t d = 0;
     46     ::send(sv[0], &d, sizeof(d), 0);
     47     ::send(sv[1], &d, sizeof(d), 0);
     48     close(sv[0]);
     49     close(sv[1]);
     50 }
     51 
     52 bool FifoSocket::writeAsync(const void *data, size_t bytes, bool waitForSpace) {
     53     if (bytes == 0) {
     54         return true;
     55     }
     56     //ALOGE("writeAsync %p %i", data, bytes);
     57     size_t ret = ::send(sv[0], data, bytes, 0);
     58     rsAssert(ret == bytes);
     59     if (ret != bytes) {
     60         ALOGE("writeAsync %p %zu  ret %zu", data, bytes, ret);
     61     }
     62     return true;
     63 }
     64 
     65 void FifoSocket::writeWaitReturn(void *retData, size_t retBytes) {
     66     if (mShutdown) {
     67         return;
     68     }
     69 
     70     //ALOGE("writeWaitReturn %p %i", retData, retBytes);
     71     size_t ret = ::recv(sv[0], retData, retBytes, MSG_WAITALL);
     72     //ALOGE("writeWaitReturn %i", ret);
     73     rsAssert(ret == retBytes);
     74 }
     75 
     76 size_t FifoSocket::read(void *data, size_t bytes) {
     77     if (mShutdown) {
     78         return 0;
     79     }
     80 
     81     //ALOGE("read %p %i", data, bytes);
     82     size_t ret = ::recv(sv[1], data, bytes, MSG_WAITALL);
     83     rsAssert(ret == bytes || mShutdown);
     84     //ALOGE("read ret %i  bytes %i", ret, bytes);
     85     if (mShutdown) {
     86         ret = 0;
     87     }
     88     return ret;
     89 }
     90 
     91 bool FifoSocket::isEmpty() {
     92     struct pollfd p;
     93     p.fd = sv[1];
     94     p.events = POLLIN;
     95     int r = poll(&p, 1, 0);
     96     //ALOGE("poll r=%i", r);
     97     return r == 0;
     98 }
     99 
    100 
    101 void FifoSocket::readReturn(const void *data, size_t bytes) {
    102     ::send(sv[1], data, bytes, 0);
    103 }
    104 
    105 } // namespace renderscript
    106 } // namespace android
    107