103 lines
2.6 KiB
C++
103 lines
2.6 KiB
C++
/*
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* Copyright (C) 2008 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <stdlib.h>
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#include <sys/socket.h>
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#include <sys/select.h>
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#include <sys/time.h>
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#include <sys/types.h>
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#include <errno.h>
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#include <pthread.h>
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#define LOG_TAG "WifiScanner"
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#include <cutils/log.h>
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#include "WifiScanner.h"
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#include "Supplicant.h"
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extern "C" int pthread_cancel(pthread_t thread);
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WifiScanner::WifiScanner(Supplicant *suppl, int period) {
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mSuppl = suppl;
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mPeriod = period;
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mActive = false;
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}
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int WifiScanner::start(bool active) {
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mActive = active;
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if(pipe(mCtrlPipe))
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return -1;
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if (pthread_create(&mThread, NULL, WifiScanner::threadStart, this))
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return -1;
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return 0;
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}
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void *WifiScanner::threadStart(void *obj) {
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WifiScanner *me = reinterpret_cast<WifiScanner *>(obj);
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me->run();
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pthread_exit(NULL);
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return NULL;
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}
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int WifiScanner::stop() {
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char c = 0;
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if (write(mCtrlPipe[1], &c, 1) != 1) {
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ALOGE("Error writing to control pipe (%s)", strerror(errno));
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return -1;
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}
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void *ret;
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if (pthread_join(mThread, &ret)) {
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ALOGE("Error joining to scanner thread (%s)", strerror(errno));
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return -1;
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}
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close(mCtrlPipe[0]);
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close(mCtrlPipe[1]);
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return 0;
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}
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void WifiScanner::run() {
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ALOGD("Starting wifi scanner (active = %d)", mActive);
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while(1) {
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fd_set read_fds;
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struct timeval to;
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int rc = 0;
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to.tv_usec = 0;
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to.tv_sec = mPeriod;
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FD_ZERO(&read_fds);
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FD_SET(mCtrlPipe[0], &read_fds);
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if (mSuppl->triggerScan(mActive)) {
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ALOGW("Error triggering scan (%s)", strerror(errno));
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}
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if ((rc = select(mCtrlPipe[0] + 1, &read_fds, NULL, NULL, &to)) < 0) {
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ALOGE("select failed (%s) - sleeping for one scanner period", strerror(errno));
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sleep(mPeriod);
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continue;
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} else if (!rc) {
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} else if (FD_ISSET(mCtrlPipe[0], &read_fds))
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break;
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} // while
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ALOGD("Stopping wifi scanner");
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}
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