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// Copyright (c) 2010 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// Defines a variant of libgps wrapper for use with the 2.38 release of the API.
#include "chrome/browser/geolocation/libgps_wrapper_linux.h"
// This lot needed for DataWaiting()
#include <sys/socket.h>
#include <sys/time.h>
#include "base/logging.h"
#include "chrome/common/geoposition.h"
#include "third_party/gpsd/release-2.38/gps.h"
class LibGpsV238 : public LibGps {
public:
explicit LibGpsV238(LibGpsLibraryWrapper* dl_wrapper) : LibGps(dl_wrapper) {}
// LibGps
virtual bool StartStreaming() {
return library().query("w+x\n") == 0;
}
virtual bool DataWaiting() {
// Unfortunately the 2.38 API has no public method for non-blocking test
// for new data arrived, so we must contrive our own by doing a select() on
// the underlying struct's socket fd.
fd_set fds;
struct timeval timeout = {0};
int fd = library().data().gps_fd;
FD_ZERO(&fds);
FD_SET(fd, &fds);
int ret = select(fd + 1, &fds, NULL, NULL, &timeout);
if (ret == -1) {
LOG(WARNING) << "libgps socket select failed: " << ret;
return false;
}
DCHECK_EQ(!!ret, !!FD_ISSET(fd, &fds));
return ret;
}
virtual bool GetPositionIfFixed(Geoposition* position) {
// This function is duplicated between the library versions, however it
// cannot be shared as each one must be strictly compiled against the
// corresponding version of gps.h.
DCHECK(position);
const gps_data_t& gps_data = library().data();
if (gps_data.status == STATUS_NO_FIX)
return false;
position->latitude = gps_data.fix.latitude;
position->longitude = gps_data.fix.longitude;
position->accuracy = gps_data.fix.eph;
position->altitude = gps_data.fix.altitude;
position->altitude_accuracy = gps_data.fix.epv;
position->heading = gps_data.fix.track;
position->speed = gps_data.fix.speed;
return true;
}
private:
DISALLOW_COPY_AND_ASSIGN(LibGpsV238);
};
LibGps* LibGps::NewV238(LibGpsLibraryWrapper* dl_wrapper) {
return new LibGpsV238(dl_wrapper);
}
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