add boost on mac

macx64/include/boost/dll/detail/posix/shared_library_impl.hpp

@@ -0,0 +1,222 @@
+// Copyright 2014 Renato Tegon Forti, Antony Polukhin.
+// Copyright 2015-2019 Antony Polukhin.
+//
+// Distributed under the Boost Software License, Version 1.0.
+// (See accompanying file LICENSE_1_0.txt
+// or copy at http://www.boost.org/LICENSE_1_0.txt)
+
+#ifndef BOOST_DLL_SHARED_LIBRARY_IMPL_HPP
+#define BOOST_DLL_SHARED_LIBRARY_IMPL_HPP
+
+#include <boost/dll/config.hpp>
+#include <boost/dll/shared_library_load_mode.hpp>
+#include <boost/dll/detail/posix/path_from_handle.hpp>
+#include <boost/dll/detail/posix/program_location_impl.hpp>
+
+#include <boost/move/utility.hpp>
+#include <boost/swap.hpp>
+#include <boost/predef/os.h>
+
+#include <dlfcn.h>
+#include <cstring> // strncmp
+#if !BOOST_OS_MACOS && !BOOST_OS_IOS && !BOOST_OS_QNX
+#   include <link.h>
+#elif BOOST_OS_QNX
+// QNX's copy of <elf.h> and <link.h> reside in sys folder
+#   include <sys/link.h>
+#endif
+
+#ifdef BOOST_HAS_PRAGMA_ONCE
+# pragma once
+#endif
+
+namespace boost { namespace dll { namespace detail {
+
+class shared_library_impl {
+
+    BOOST_MOVABLE_BUT_NOT_COPYABLE(shared_library_impl)
+
+public:
+    typedef void* native_handle_t;
+
+    shared_library_impl() BOOST_NOEXCEPT
+        : handle_(NULL)
+    {}
+
+    ~shared_library_impl() BOOST_NOEXCEPT {
+        unload();
+    }
+
+    shared_library_impl(BOOST_RV_REF(shared_library_impl) sl) BOOST_NOEXCEPT
+        : handle_(sl.handle_)
+    {
+        sl.handle_ = NULL;
+    }
+
+    shared_library_impl & operator=(BOOST_RV_REF(shared_library_impl) sl) BOOST_NOEXCEPT {
+        swap(sl);
+        return *this;
+    }
+
+
+    static boost::dll::fs::path decorate(const boost::dll::fs::path & sl) {
+        boost::dll::fs::path actual_path = (
+            std::strncmp(sl.filename().string().c_str(), "lib", 3)
+            ? boost::dll::fs::path((sl.has_parent_path() ? sl.parent_path() / L"lib" : L"lib").native() + sl.filename().native())
+            : sl
+        );
+        actual_path += suffix();
+        return actual_path;
+    }
+
+    void load(boost::dll::fs::path sl, load_mode::type mode, boost::dll::fs::error_code &ec) {
+        typedef int native_mode_t;
+        unload();
+
+        // Do not allow opening NULL paths. User must use program_location() instead
+        if (sl.empty()) {
+            boost::dll::detail::reset_dlerror();
+            ec = boost::dll::fs::make_error_code(
+                boost::dll::fs::errc::bad_file_descriptor
+            );
+
+            return;
+        }
+
+        // Fixing modes
+        if (!(mode & load_mode::rtld_now)) {
+            mode |= load_mode::rtld_lazy;
+        }
+
+        if (!(mode & load_mode::rtld_global)) {
+            mode |= load_mode::rtld_local;
+        }
+
+#if BOOST_OS_LINUX || BOOST_OS_ANDROID
+        if (!sl.has_parent_path() && !(mode & load_mode::search_system_folders)) {
+            sl = "." / sl;
+        }
+#else
+        if (!sl.is_absolute() && !(mode & load_mode::search_system_folders)) {
+            boost::dll::fs::error_code current_path_ec;
+            boost::dll::fs::path prog_loc = boost::dll::fs::current_path(current_path_ec);
+            if (!current_path_ec) {
+                prog_loc /= sl;
+                sl.swap(prog_loc);
+            }
+        }
+#endif
+
+        mode &= ~load_mode::search_system_folders;
+
+        // Trying to open with appended decorations
+        if (!!(mode & load_mode::append_decorations)) {
+            mode &= ~load_mode::append_decorations;
+
+            boost::dll::fs::path actual_path = decorate(sl);
+            handle_ = dlopen(actual_path.c_str(), static_cast<native_mode_t>(mode));
+            if (handle_) {
+                boost::dll::detail::reset_dlerror();
+                return;
+            }
+            boost::dll::fs::error_code prog_loc_err;
+            boost::dll::fs::path loc = boost::dll::detail::program_location_impl(prog_loc_err);
+            if (boost::dll::fs::exists(actual_path) && !boost::dll::fs::equivalent(sl, loc, prog_loc_err)) {
+                // decorated path exists : current error is not a bad file descriptor and we are not trying to load the executable itself
+                ec = boost::dll::fs::make_error_code(
+                    boost::dll::fs::errc::executable_format_error
+                );
+                return;
+            }
+        }
+
+        // Opening by exactly specified path
+        handle_ = dlopen(sl.c_str(), static_cast<native_mode_t>(mode));
+        if (handle_) {
+            boost::dll::detail::reset_dlerror();
+            return;
+        }
+
+        ec = boost::dll::fs::make_error_code(
+            boost::dll::fs::errc::bad_file_descriptor
+        );
+
+        // Maybe user wanted to load the executable itself? Checking...
+        // We assume that usually user wants to load a dynamic library not the executable itself, that's why
+        // we try this only after traditional load fails.
+        boost::dll::fs::error_code prog_loc_err;
+        boost::dll::fs::path loc = boost::dll::detail::program_location_impl(prog_loc_err);
+        if (!prog_loc_err && boost::dll::fs::equivalent(sl, loc, prog_loc_err) && !prog_loc_err) {
+            // As is known the function dlopen() loads the dynamic library file
+            // named by the null-terminated string filename and returns an opaque
+            // "handle" for the dynamic library. If filename is NULL, then the
+            // returned handle is for the main program.
+            ec.clear();
+            boost::dll::detail::reset_dlerror();
+            handle_ = dlopen(NULL, static_cast<native_mode_t>(mode));
+            if (!handle_) {
+                ec = boost::dll::fs::make_error_code(
+                    boost::dll::fs::errc::bad_file_descriptor
+                );
+            }
+        }
+    }
+
+    bool is_loaded() const BOOST_NOEXCEPT {
+        return (handle_ != 0);
+    }
+
+    void unload() BOOST_NOEXCEPT {
+        if (!is_loaded()) {
+            return;
+        }
+
+        dlclose(handle_);
+        handle_ = 0;
+    }
+
+    void swap(shared_library_impl& rhs) BOOST_NOEXCEPT {
+        boost::swap(handle_, rhs.handle_);
+    }
+
+    boost::dll::fs::path full_module_path(boost::dll::fs::error_code &ec) const {
+        return boost::dll::detail::path_from_handle(handle_, ec);
+    }
+
+    static boost::dll::fs::path suffix() {
+        // https://sourceforge.net/p/predef/wiki/OperatingSystems/
+#if BOOST_OS_MACOS || BOOST_OS_IOS
+        return ".dylib";
+#else
+        return ".so";
+#endif
+    }
+
+    void* symbol_addr(const char* sb, boost::dll::fs::error_code &ec) const BOOST_NOEXCEPT {
+        // dlsym - obtain the address of a symbol from a dlopen object
+        void* const symbol = dlsym(handle_, sb);
+        if (symbol == NULL) {
+            ec = boost::dll::fs::make_error_code(
+                boost::dll::fs::errc::invalid_seek
+            );
+        }
+
+        // If handle does not refer to a valid object opened by dlopen(),
+        // or if the named symbol cannot be found within any of the objects
+        // associated with handle, dlsym() shall return NULL.
+        // More detailed diagnostic information shall be available through dlerror().
+
+        return symbol;
+    }
+
+    native_handle_t native() const BOOST_NOEXCEPT {
+        return handle_;
+    }
+
+private:
+    native_handle_t         handle_;
+};
+
+}}} // boost::dll::detail
+
+#endif // BOOST_DLL_SHARED_LIBRARY_IMPL_HPP