libcruft-util/exe.cpp

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2012-04-30 11:50:38 +10:00
/*
* This file is part of libgim.
*
* libgim 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.
*
* libgim 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 libgim. If not, see <http://www.gnu.org/licenses/>.
*
* Copyright 2010-2012 Danny Robson <danny@nerdcruft.net>
*/
#include "exe.hpp"
#include "platform.hpp"
#ifdef PLATFORM_LINUX
#include "types.hpp"
#include "except.hpp"
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#include <unistd.h>
#include <stdexcept>
#include <vector>
boost::filesystem::path
util::image_path (void) {
static const char PROC_SELF[] = "/proc/self/exe";
// We can't use lstat to check the size of the link in proc, as Linux
// will return 0 for most entries under proc. Instead we've got to
// iterate for a correct size.
std::vector<char> resolved (256);
retry:
const auto written = readlink (PROC_SELF, resolved.data (), resolved.size ());
if (written < 0)
errno_error::throw_code ();
if (sign_cast<size_t> (written) == resolved.size ()) {
resolved.resize (resolved.size () * 2);
goto retry;
}
return boost::filesystem::path (resolved.data (), resolved.data () + written);
}
#else
#error "Unknown platform"
#endif