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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.
#include "chrome/browser/geolocation/libgps_wrapper_linux.h"
#include <dlfcn.h>
#include <errno.h>
#include "chrome/common/geoposition.h"
#include "base/logging.h"
#include "base/string_util.h"
namespace {
// Pass to TryToOpen() to indicate which functions should be wired up.
// This could be turned into a bit mask if required, but for now the
// two options are mutually exclusive.
enum InitMode {
INITMODE_QUERY,
INITMODE_STREAM,
};
// Attempts to load dynamic library named |lib| and initialize the required
// function pointers according to |mode|. Returns ownership a new instance
// of the library loader class, or NULL on failure.
LibGpsLibraryWrapper* TryToOpen(const char* lib, InitMode mode) {
void* dl_handle = dlopen(lib, RTLD_LAZY);
if (!dl_handle) {
LOG(INFO) << "Could not open " << lib << ": " << dlerror();
return NULL;
}
LOG(INFO) << "Loaded " << lib;
#define DECLARE_FN_POINTER(function, required) \
LibGpsLibraryWrapper::function##_fn function; \
function = reinterpret_cast<LibGpsLibraryWrapper::function##_fn>( \
dlsym(dl_handle, #function)); \
if ((required) && !function) { \
LOG(INFO) << "libgps " << #function << " error: " << dlerror(); \
dlclose(dl_handle); \
return NULL; \
}
DECLARE_FN_POINTER(gps_open, true);
DECLARE_FN_POINTER(gps_close, true);
DECLARE_FN_POINTER(gps_poll, true);
DECLARE_FN_POINTER(gps_query, mode == INITMODE_QUERY);
DECLARE_FN_POINTER(gps_stream, mode == INITMODE_STREAM);
DECLARE_FN_POINTER(gps_waiting, mode == INITMODE_STREAM);
#undef DECLARE_FN_POINTER
return new LibGpsLibraryWrapper(dl_handle,
gps_open,
gps_close,
gps_poll,
gps_query,
gps_stream,
gps_waiting);
}
} // namespace
LibGps::LibGps(LibGpsLibraryWrapper* dl_wrapper)
: library_(dl_wrapper) {
DCHECK(dl_wrapper != NULL);
}
LibGps::~LibGps() {
}
LibGps* LibGps::New() {
LibGpsLibraryWrapper* wrapper;
wrapper = TryToOpen("libgps.so.19", INITMODE_STREAM);
if (wrapper)
return NewV294(wrapper);
wrapper = TryToOpen("libgps.so.17", INITMODE_QUERY);
if (wrapper)
return NewV238(wrapper);
wrapper = TryToOpen("libgps.so", INITMODE_STREAM);
if (wrapper)
return NewV294(wrapper);
return NULL;
}
bool LibGps::Start() {
if (library().is_open())
return true;
errno = 0;
static int fail_count = 0;
if (!library().open(NULL, NULL)) {
// See gps.h NL_NOxxx for definition of gps_open() error numbers.
LOG_IF(WARNING, 0 == fail_count++) << "gps_open() failed: " << errno;
return false;
}
fail_count = 0;
if (!StartStreaming()) {
LOG(INFO) << "StartStreaming failed";
library().close();
return false;
}
return true;
}
void LibGps::Stop() {
library().close();
}
bool LibGps::Poll() {
last_error_ = "no data received from gpsd";
while (DataWaiting()) {
int error = library().poll();
if (error) {
last_error_ = StringPrintf("poll() returned %d", error);
Stop();
return false;
}
last_error_.clear();
}
return last_error_.empty();
}
bool LibGps::GetPosition(Geoposition* position) {
DCHECK(position);
position->error_code = Geoposition::ERROR_CODE_POSITION_UNAVAILABLE;
if (!library().is_open()) {
position->error_message = "No gpsd connection";
return false;
}
if (!GetPositionIfFixed(position)) {
position->error_message = last_error_;
return false;
}
position->error_code = Geoposition::ERROR_CODE_NONE;
position->timestamp = base::Time::Now();
if (!position->IsValidFix()) {
// GetPositionIfFixed returned true, yet we've not got a valid fix.
// This shouldn't happen; something went wrong in the conversion.
NOTREACHED() << "Invalid position from GetPositionIfFixed: lat,long "
<< position->latitude << "," << position->longitude
<< " accuracy " << position->accuracy << " time "
<< position->timestamp.ToDoubleT();
position->error_code = Geoposition::ERROR_CODE_POSITION_UNAVAILABLE;
position->error_message = "Bad fix from gps";
return false;
}
return true;
}
LibGpsLibraryWrapper::LibGpsLibraryWrapper(void* dl_handle,
gps_open_fn gps_open,
gps_close_fn gps_close,
gps_poll_fn gps_poll,
gps_query_fn gps_query,
gps_stream_fn gps_stream,
gps_waiting_fn gps_waiting)
: dl_handle_(dl_handle),
gps_open_(gps_open),
gps_close_(gps_close),
gps_poll_(gps_poll),
gps_query_(gps_query),
gps_stream_(gps_stream),
gps_waiting_(gps_waiting),
gps_data_(NULL) {
}
LibGpsLibraryWrapper::~LibGpsLibraryWrapper() {
close();
if (dl_handle_) {
const int err = dlclose(dl_handle_);
CHECK_EQ(0, err) << "Error closing dl handle: " << err;
}
}
bool LibGpsLibraryWrapper::open(const char* host, const char* port) {
DCHECK(!gps_data_) << "libgps already opened";
DCHECK(gps_open_);
gps_data_ = gps_open_(host, port);
return is_open();
}
void LibGpsLibraryWrapper::close() {
if (is_open()) {
DCHECK(gps_close_);
gps_close_(gps_data_);
gps_data_ = NULL;
}
}
int LibGpsLibraryWrapper::poll() {
DCHECK(is_open());
DCHECK(gps_poll_);
return gps_poll_(gps_data_);
}
// This is intentionally ignoring the va_arg extension to query(): the caller
// can use base::StringPrintf to achieve the same effect.
int LibGpsLibraryWrapper::query(const char* fmt) {
DCHECK(is_open());
DCHECK(gps_query_);
return gps_query_(gps_data_, fmt);
}
int LibGpsLibraryWrapper::stream(int flags) {
DCHECK(is_open());
DCHECK(gps_stream_);
return gps_stream_(gps_data_, flags, NULL);
}
bool LibGpsLibraryWrapper::waiting() {
DCHECK(is_open());
DCHECK(gps_waiting_);
return gps_waiting_(gps_data_);
}
const gps_data_t& LibGpsLibraryWrapper::data() const {
DCHECK(is_open());
return *gps_data_;
}
bool LibGpsLibraryWrapper::is_open() const {
return gps_data_ != NULL;
}
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