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      1 /*
      2  * Copyright (C) 2008 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 #include <stdio.h>
     17 #include <errno.h>
     18 #include <stdlib.h>
     19 #include <sys/socket.h>
     20 #include <sys/select.h>
     21 #include <sys/time.h>
     22 #include <sys/types.h>
     23 #include <sys/un.h>
     24 
     25 #define LOG_TAG "WifiStatusPoller"
     26 #include <cutils/log.h>
     27 
     28 #include "WifiStatusPoller.h"
     29 #include "IWifiStatusPollerHandler.h"
     30 
     31 
     32 WifiStatusPoller::WifiStatusPoller(IWifiStatusPollerHandler *handler) :
     33                   mHandlers(handler) {
     34     mPollingInterval = 5;
     35     mStarted = false;
     36 }
     37 
     38 int WifiStatusPoller::start() {
     39 
     40     if (pipe(mCtrlPipe))
     41         return -1;
     42 
     43     if (pthread_create(&mThread, NULL, WifiStatusPoller::threadStart, this))
     44         return -1;
     45 
     46     return 0;
     47 }
     48 
     49 int WifiStatusPoller::stop() {
     50     char c = 0;
     51 
     52     if (write(mCtrlPipe[1], &c, 1) != 1) {
     53         LOGE("Error writing to control pipe (%s)", strerror(errno));
     54         return -1;
     55     }
     56 
     57     void *ret;
     58     if (pthread_join(mThread, &ret)) {
     59         LOGE("Error joining to listener thread (%s)", strerror(errno));
     60         return -1;
     61     }
     62     close(mCtrlPipe[0]);
     63     close(mCtrlPipe[1]);
     64     return 0;
     65 }
     66 
     67 void *WifiStatusPoller::threadStart(void *obj) {
     68     WifiStatusPoller *me = reinterpret_cast<WifiStatusPoller *>(obj);
     69 
     70     me->mStarted = true;
     71     LOGD("Starting");
     72     me->run();
     73     me->mStarted = false;
     74     LOGD("Stopping");
     75     pthread_exit(NULL);
     76     return NULL;
     77 }
     78 
     79 void WifiStatusPoller::run() {
     80 
     81     while(1) {
     82         struct timeval to;
     83         fd_set read_fds;
     84         int rc = 0;
     85         int max = 0;
     86 
     87         FD_ZERO(&read_fds);
     88         to.tv_usec = 0;
     89         to.tv_sec = mPollingInterval;
     90 
     91         FD_SET(mCtrlPipe[0], &read_fds);
     92         max = mCtrlPipe[0];
     93 
     94         if ((rc = select(max + 1, &read_fds, NULL, NULL, &to)) < 0) {
     95             LOGE("select failed (%s)", strerror(errno));
     96             sleep(1);
     97             continue;
     98         } else if (!rc) {
     99             mHandlers->onStatusPollInterval();
    100         }
    101         if (FD_ISSET(mCtrlPipe[0], &read_fds))
    102             break;
    103     }
    104 }
    105