90 lines
2.4 KiB
C++
90 lines
2.4 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 2010-2012 Danny Robson <danny@nerdcruft.net>
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*/
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#include "exe.hpp"
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#include "platform.hpp"
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#if defined(PLATFORM_LINUX)
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#include "except.hpp"
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#include "cast.hpp"
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include <unistd.h>
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#include <stdexcept>
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#include <vector>
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boost::filesystem::path
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util::image_path (void) {
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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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errno_error::throw_code ();
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if (sign_cast<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 boost::filesystem::path (resolved.data (), resolved.data () + written);
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}
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#elif defined(PLATFORM_WIN32)
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#include "except.hpp"
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#include <windows.h>
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boost::filesystem::path
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util::image_path (void) {
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std::vector<char> resolved (256);
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retry:
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const auto written = GetModuleFileName (nullptr, resolved.data (), resolved.size ());
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if (written == 0)
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win32_error::throw_code ();
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if (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 boost::filesystem::path (resolved.data (), resolved.data () + written);
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}
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#else
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#error "Unknown platform"
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// Mac OS X: _NSGetExecutablePath() (man 3 dyld)
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// Linux: readlink /proc/self/exe
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// Solaris: getexecname()
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// FreeBSD: sysctl CTL_KERN KERN_PROC KERN_PROC_PATHNAME -1
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// BSD with procfs: readlink /proc/curproc/file
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// Windows: GetModuleFileName() with hModule = NULL
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#endif
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