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