44 lines
1.2 KiB
C++
44 lines
1.2 KiB
C++
/*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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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 <filesystem>
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#include <unistd.h>
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///////////////////////////////////////////////////////////////////////////////
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std::filesystem::path
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cruft::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 (cruft::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::filesystem::path (resolved.data (), resolved.data () + written);
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}
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