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//
// Copyright 2010 Ettus Research LLC
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
//
#include <uhd/utils/static.hpp>
#include <boost/format.hpp>
#include <boost/foreach.hpp>
#include <boost/algorithm/string.hpp>
#include <boost/filesystem.hpp>
#include <boost/program_options.hpp>
#include <iostream>
#include <stdexcept>
namespace po = boost::program_options;
namespace fs = boost::filesystem;
/***********************************************************************
* Module Load Function
**********************************************************************/
#if defined(HAVE_DLFCN_H)
#include <dlfcn.h>
static const std::string env_path_sep = ":";
static void load_module(const std::string &file_name){
if (dlopen(file_name.c_str(), RTLD_LAZY) == NULL){
throw std::runtime_error(str(
boost::format("dlopen failed to load \"%s\"") % file_name
));
}
}
#elif defined(HAVE_WINDOWS_H)
#include <windows.h>
static const std::string env_path_sep = ";";
static void load_module(const std::string &file_name){
if (LoadLibrary(file_name.c_str()) == NULL){
throw std::runtime_error(str(
boost::format("LoadLibrary failed to load \"%s\"") % file_name
));
}
}
#else
static const std::string env_path_sep = ":";
static void load_module(const std::string &file_name){
throw std::runtime_error(str(
boost::format("Module loading not supported: Cannot load \"%s\"") % file_name
));
}
#endif
/***********************************************************************
* Load Modules
**********************************************************************/
/*!
* Load all modules in a given path.
* This will recurse into sub-directories.
* Does not throw, prints to std error.
* \param path the filesystem path
*/
static void load_path(const fs::path &path){
if (not fs::exists(path)){
std::cerr << boost::format("Module path \"%s\" not found.") % path.file_string() << std::endl;
return;
}
//try to load the files in this path
if (fs::is_directory(path)){
for(
fs::directory_iterator dir_itr(path);
dir_itr != fs::directory_iterator();
++dir_itr
){
load_path(dir_itr->path());
}
return;
}
//its not a directory, try to load it
try{
load_module(path.file_string());
}
catch(const std::exception &err){
std::cerr << boost::format("Error: %s") % err.what() << std::endl;
}
}
//! The string constant for the module path environment variable
static const std::string MODULE_PATH_KEY = "UHD_MODULE_PATH";
/*!
* Name mapper function for the environment variable parser.
* Map environment variable names (that we use) to option names.
* \param the variable name
* \return the option name or blank string
*/
static std::string name_mapper(const std::string &var_name){
if (var_name == MODULE_PATH_KEY) return var_name;
return "";
}
/*!
* Load all the modules given by the module path enviroment variable.
* The path variable may be several paths split by path separators.
*/
UHD_STATIC_BLOCK(load_modules){
//register the options
std::string env_module_path;
po::options_description desc("UHD Module Options");
desc.add_options()
(MODULE_PATH_KEY.c_str(), po::value<std::string>(&env_module_path)->default_value(""))
;
//parse environment variables
po::variables_map vm;
po::store(po::parse_environment(desc, &name_mapper), vm);
po::notify(vm);
if (env_module_path == "") return;
//std::cout << "env_module_path: " << env_module_path << std::endl;
//split the path at the path separators
std::vector<std::string> module_paths;
boost::split(module_paths, env_module_path, boost::is_any_of(env_path_sep));
//load modules in each path
BOOST_FOREACH(const std::string &module_path, module_paths){
load_path(fs::system_complete(fs::path(module_path)));
}
}
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