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