add boost on mac

macx64/include/boost/process/detail/posix/start_dir.hpp

@@ -0,0 +1,38 @@
+// Copyright (c) 2006, 2007 Julio M. Merino Vidal
+// Copyright (c) 2008 Ilya Sokolov, Boris Schaeling
+// Copyright (c) 2009 Boris Schaeling
+// Copyright (c) 2010 Felipe Tanus, Boris Schaeling
+// Copyright (c) 2011, 2012 Jeff Flinn, Boris Schaeling
+//
+// 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_PROCESS_DETAIL_POSIX_START_DIR_HPP
+#define BOOST_PROCESS_DETAIL_POSIX_START_DIR_HPP
+
+#include <boost/process/detail/posix/handler.hpp>
+#include <string>
+#include <unistd.h>
+
+namespace boost { namespace process { namespace detail { namespace posix {
+
+template<typename Char>
+struct start_dir_init : handler_base_ext
+{
+    typedef Char value_type;
+    typedef std::basic_string<value_type> string_type;
+    start_dir_init(const string_type &s) : s_(s) {}
+
+    template <class PosixExecutor>
+    void on_exec_setup(PosixExecutor&) const
+    {
+        ::chdir(s_.c_str());
+    }
+    const string_type & str() const {return s_;}
+private:
+    string_type s_;
+};
+
+}}}}
+
+#endif