52 lines
1.5 KiB
C++
52 lines
1.5 KiB
C++
/*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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* Copyright 2010-2016 Danny Robson <danny@nerdcruft.net>
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*/
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#include "exe.hpp"
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#include "cast.hpp"
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#include "posix/except.hpp"
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#include <vector>
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#include <experimental/filesystem>
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#include <unistd.h>
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///////////////////////////////////////////////////////////////////////////////
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std::experimental::filesystem::path
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util::image_path (void)
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{
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static const char PROC_SELF[] = "/proc/self/exe";
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// We can't use lstat to check the size of the link in proc, as Linux
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// will return 0 for most entries under proc. Instead we've got to
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// iterate for a correct size.
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std::vector<char> resolved (256);
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retry:
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const auto written = readlink (PROC_SELF, resolved.data (), resolved.size ());
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if (written < 0)
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posix::error::throw_code ();
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if (util::cast::sign <size_t> (written) == resolved.size ()) {
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resolved.resize (resolved.size () * 2);
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goto retry;
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}
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return std::experimental::filesystem::path (resolved.data (), resolved.data () + written);
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}
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