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Viewing changes to src/shared/report/lttng/tracepoint_provider.cpp

  • Committer: Package Import Robot
  • Author(s): Ubuntu daily release
  • Date: 2014-10-10 14:01:26 UTC
  • mto: This revision was merged to the branch mainline in revision 84.
  • Revision ID: package-import@ubuntu.com-20141010140126-n1czko8na1kuz4ll
Tags: upstream-0.8.0+14.10.20141010
Import upstream version 0.8.0+14.10.20141010

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src/shared/report/lttng/tracepoint_provider.cpp
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/*
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 * Copyright © 2013 Canonical Ltd.
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 *
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 * This program is free software: you can redistribute it and/or modify
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 * it under the terms of the GNU Lesser General Public License version 3 as
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 * published by the Free Software Foundation.
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 *
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 * This program is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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 * GNU Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public License
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 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
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 *
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 * Authored by: Alexandros Frantzis <alexandros.frantzis@canonical.com>
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 */
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#include "mir/report/lttng/tracepoint_provider.h"
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#include <boost/throw_exception.hpp>
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#include <stdexcept>
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#include <dlfcn.h>
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namespace
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{
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std::string const tracepoint_lib_install_path{MIR_TRACEPOINT_LIB_INSTALL_PATH};
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void* open_tracepoint_lib(std::string const& lib_name)
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{
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    auto lib = dlopen(lib_name.c_str(), RTLD_NOW);
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    if (lib == nullptr)
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    {
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        std::string path{tracepoint_lib_install_path + "/" + lib_name};
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        lib = dlopen(path.c_str(), RTLD_NOW);
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    }
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    if (lib == nullptr)
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    {
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        std::string msg{"Failed to load tracepoint provider: "};
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        msg += dlerror();
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        BOOST_THROW_EXCEPTION(std::runtime_error(msg));
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    }
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    return lib;
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}
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}
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mir::report::lttng::TracepointProvider::TracepointProvider(std::string const& lib_name)
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    : lib{open_tracepoint_lib(lib_name)}
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{
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}
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mir::report::lttng::TracepointProvider::~TracepointProvider() noexcept
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{
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    dlclose(lib);
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}