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| 1 // Copyright (c) 2010 The Chromium Authors. All rights reserved. | |
| 2 // Use of this source code is governed by a BSD-style license that can be | |
| 3 // found in the LICENSE file. | |
| 4 | |
| 5 #include "chrome/browser/geolocation/libgps_wrapper_linux.h" | |
| 6 | |
| 7 #include <dlfcn.h> | |
| 8 #include <errno.h> | |
| 9 | |
| 10 #include "chrome/common/geoposition.h" | |
| 11 #include "base/logging.h" | |
| 12 #include "base/string_util.h" | |
| 13 | |
| 14 namespace { | |
| 15 // Pass to TryToOpen() to indicate which functions should be wired up. | |
| 16 // This could be turned into a bit mask if required, but for now the | |
| 17 // two options are mutually exclusive. | |
| 18 enum InitMode { | |
| 19 INITMODE_QUERY, | |
| 20 INITMODE_STREAM, | |
| 21 }; | |
| 22 | |
| 23 // Attempts to load dynamic library named |lib| and initialize the required | |
| 24 // function pointers according to |mode|. Returns ownership a new instance | |
| 25 // of the library loader class, or NULL on failure. | |
| 26 LibGpsLibraryWrapper* TryToOpen(const char* lib, InitMode mode) { | |
| 27 void* dl_handle = dlopen(lib, RTLD_LAZY); | |
| 28 if (!dl_handle) { | |
| 29 VLOG(1) << "Could not open " << lib << ": " << dlerror(); | |
| 30 return NULL; | |
| 31 } | |
| 32 VLOG(1) << "Loaded " << lib; | |
| 33 | |
| 34 #define DECLARE_FN_POINTER(function, required) \ | |
| 35 LibGpsLibraryWrapper::function##_fn function; \ | |
| 36 function = reinterpret_cast<LibGpsLibraryWrapper::function##_fn>( \ | |
| 37 dlsym(dl_handle, #function)); \ | |
| 38 if ((required) && !function) { \ | |
| 39 LOG(WARNING) << "libgps " << #function << " error: " << dlerror(); \ | |
| 40 dlclose(dl_handle); \ | |
| 41 return NULL; \ | |
| 42 } | |
| 43 DECLARE_FN_POINTER(gps_open, true); | |
| 44 DECLARE_FN_POINTER(gps_close, true); | |
| 45 DECLARE_FN_POINTER(gps_poll, true); | |
| 46 DECLARE_FN_POINTER(gps_query, mode == INITMODE_QUERY); | |
| 47 DECLARE_FN_POINTER(gps_stream, mode == INITMODE_STREAM); | |
| 48 DECLARE_FN_POINTER(gps_waiting, mode == INITMODE_STREAM); | |
| 49 #undef DECLARE_FN_POINTER | |
| 50 | |
| 51 return new LibGpsLibraryWrapper(dl_handle, | |
| 52 gps_open, | |
| 53 gps_close, | |
| 54 gps_poll, | |
| 55 gps_query, | |
| 56 gps_stream, | |
| 57 gps_waiting); | |
| 58 } | |
| 59 } // namespace | |
| 60 | |
| 61 LibGps::LibGps(LibGpsLibraryWrapper* dl_wrapper) | |
| 62 : library_(dl_wrapper) { | |
| 63 DCHECK(dl_wrapper != NULL); | |
| 64 } | |
| 65 | |
| 66 LibGps::~LibGps() { | |
| 67 } | |
| 68 | |
| 69 LibGps* LibGps::New() { | |
| 70 LibGpsLibraryWrapper* wrapper; | |
| 71 wrapper = TryToOpen("libgps.so.19", INITMODE_STREAM); | |
| 72 if (wrapper) | |
| 73 return NewV294(wrapper); | |
| 74 wrapper = TryToOpen("libgps.so.17", INITMODE_QUERY); | |
| 75 if (wrapper) | |
| 76 return NewV238(wrapper); | |
| 77 wrapper = TryToOpen("libgps.so", INITMODE_STREAM); | |
| 78 if (wrapper) | |
| 79 return NewV294(wrapper); | |
| 80 return NULL; | |
| 81 } | |
| 82 | |
| 83 bool LibGps::Start() { | |
| 84 if (library().is_open()) | |
| 85 return true; | |
| 86 errno = 0; | |
| 87 static int fail_count = 0; | |
| 88 if (!library().open(NULL, NULL)) { | |
| 89 // See gps.h NL_NOxxx for definition of gps_open() error numbers. | |
| 90 LOG_IF(WARNING, 0 == fail_count++) << "gps_open() failed: " << errno; | |
| 91 return false; | |
| 92 } | |
| 93 fail_count = 0; | |
| 94 if (!StartStreaming()) { | |
| 95 VLOG(1) << "StartStreaming failed"; | |
| 96 library().close(); | |
| 97 return false; | |
| 98 } | |
| 99 return true; | |
| 100 } | |
| 101 | |
| 102 void LibGps::Stop() { | |
| 103 library().close(); | |
| 104 } | |
| 105 | |
| 106 bool LibGps::Poll() { | |
| 107 last_error_ = "no data received from gpsd"; | |
| 108 while (DataWaiting()) { | |
| 109 int error = library().poll(); | |
| 110 if (error) { | |
| 111 last_error_ = StringPrintf("poll() returned %d", error); | |
| 112 Stop(); | |
| 113 return false; | |
| 114 } | |
| 115 last_error_.clear(); | |
| 116 } | |
| 117 return last_error_.empty(); | |
| 118 } | |
| 119 | |
| 120 bool LibGps::GetPosition(Geoposition* position) { | |
| 121 DCHECK(position); | |
| 122 position->error_code = Geoposition::ERROR_CODE_POSITION_UNAVAILABLE; | |
| 123 if (!library().is_open()) { | |
| 124 position->error_message = "No gpsd connection"; | |
| 125 return false; | |
| 126 } | |
| 127 if (!GetPositionIfFixed(position)) { | |
| 128 position->error_message = last_error_; | |
| 129 return false; | |
| 130 } | |
| 131 position->error_code = Geoposition::ERROR_CODE_NONE; | |
| 132 position->timestamp = base::Time::Now(); | |
| 133 if (!position->IsValidFix()) { | |
| 134 // GetPositionIfFixed returned true, yet we've not got a valid fix. | |
| 135 // This shouldn't happen; something went wrong in the conversion. | |
| 136 NOTREACHED() << "Invalid position from GetPositionIfFixed: lat,long " | |
| 137 << position->latitude << "," << position->longitude | |
| 138 << " accuracy " << position->accuracy << " time " | |
| 139 << position->timestamp.ToDoubleT(); | |
| 140 position->error_code = Geoposition::ERROR_CODE_POSITION_UNAVAILABLE; | |
| 141 position->error_message = "Bad fix from gps"; | |
| 142 return false; | |
| 143 } | |
| 144 return true; | |
| 145 } | |
| 146 | |
| 147 LibGpsLibraryWrapper::LibGpsLibraryWrapper(void* dl_handle, | |
| 148 gps_open_fn gps_open, | |
| 149 gps_close_fn gps_close, | |
| 150 gps_poll_fn gps_poll, | |
| 151 gps_query_fn gps_query, | |
| 152 gps_stream_fn gps_stream, | |
| 153 gps_waiting_fn gps_waiting) | |
| 154 : dl_handle_(dl_handle), | |
| 155 gps_open_(gps_open), | |
| 156 gps_close_(gps_close), | |
| 157 gps_poll_(gps_poll), | |
| 158 gps_query_(gps_query), | |
| 159 gps_stream_(gps_stream), | |
| 160 gps_waiting_(gps_waiting), | |
| 161 gps_data_(NULL) { | |
| 162 } | |
| 163 | |
| 164 LibGpsLibraryWrapper::~LibGpsLibraryWrapper() { | |
| 165 close(); | |
| 166 if (dl_handle_) { | |
| 167 const int err = dlclose(dl_handle_); | |
| 168 CHECK_EQ(0, err) << "Error closing dl handle: " << err; | |
| 169 } | |
| 170 } | |
| 171 | |
| 172 bool LibGpsLibraryWrapper::open(const char* host, const char* port) { | |
| 173 DCHECK(!gps_data_) << "libgps already opened"; | |
| 174 DCHECK(gps_open_); | |
| 175 gps_data_ = gps_open_(host, port); | |
| 176 return is_open(); | |
| 177 } | |
| 178 | |
| 179 void LibGpsLibraryWrapper::close() { | |
| 180 if (is_open()) { | |
| 181 DCHECK(gps_close_); | |
| 182 gps_close_(gps_data_); | |
| 183 gps_data_ = NULL; | |
| 184 } | |
| 185 } | |
| 186 | |
| 187 int LibGpsLibraryWrapper::poll() { | |
| 188 DCHECK(is_open()); | |
| 189 DCHECK(gps_poll_); | |
| 190 return gps_poll_(gps_data_); | |
| 191 } | |
| 192 | |
| 193 // This is intentionally ignoring the va_arg extension to query(): the caller | |
| 194 // can use base::StringPrintf to achieve the same effect. | |
| 195 int LibGpsLibraryWrapper::query(const char* fmt) { | |
| 196 DCHECK(is_open()); | |
| 197 DCHECK(gps_query_); | |
| 198 return gps_query_(gps_data_, fmt); | |
| 199 } | |
| 200 | |
| 201 int LibGpsLibraryWrapper::stream(int flags) { | |
| 202 DCHECK(is_open()); | |
| 203 DCHECK(gps_stream_); | |
| 204 return gps_stream_(gps_data_, flags, NULL); | |
| 205 } | |
| 206 | |
| 207 bool LibGpsLibraryWrapper::waiting() { | |
| 208 DCHECK(is_open()); | |
| 209 DCHECK(gps_waiting_); | |
| 210 return gps_waiting_(gps_data_); | |
| 211 } | |
| 212 | |
| 213 const gps_data_t& LibGpsLibraryWrapper::data() const { | |
| 214 DCHECK(is_open()); | |
| 215 return *gps_data_; | |
| 216 } | |
| 217 | |
| 218 bool LibGpsLibraryWrapper::is_open() const { | |
| 219 return gps_data_ != NULL; | |
| 220 } | |
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Chromium Code Reviews
Issue 6591034:
Move core pieces of geolocation from chrome to content.... (Closed)
Base URL: svn://chrome-svn/chrome/trunk/src/