Initial import from SVN

2014-03-09 10:58:52 +01:00
commit b6abce0c2f
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+// 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_POSIX_INITIALIZERS_CLOSE_FDS_IF_HPP
+#define BOOST_PROCESS_POSIX_INITIALIZERS_CLOSE_FDS_IF_HPP
+
+#include <boost/process/posix/initializers/initializer_base.hpp>
+#include <boost/iterator/counting_iterator.hpp>
+#include <boost/range/counting_range.hpp>
+#include <boost/range/adaptor/filtered.hpp>
+#include <boost/range/algorithm/for_each.hpp>
+#include <unistd.h>
+#include <fcntl.h>
+#include <errno.h>
+
+#ifndef BOOST_PROCESS_POSIX_MAX_FD
+#   define BOOST_PROCESS_POSIX_MAX_FD 32
+#endif
+
+namespace boost { namespace process { namespace posix { namespace initializers {
+
+template <class Predicate>
+class close_fds_if_ : public initializer_base
+{
+private:
+    static void close(int fd)
+    {
+        ::fcntl(fd, F_SETFD, FD_CLOEXEC);
+    }
+
+public:
+    explicit close_fds_if_(const Predicate &pred) : pred_(pred) {}
+
+    template <class PosixExecutor>
+    void on_exec_setup(PosixExecutor&) const
+    {
+        boost::for_each(
+            boost::adaptors::filter(
+                boost::counting_range(0, upper_bound()),
+                pred_
+            ),
+            close
+        );
+    }
+
+private:
+    static int upper_bound()
+    {
+        int up;
+#if defined(F_MAXFD)
+        do
+        {
+            up = ::fcntl(0, F_MAXFD);
+        } while (up == -1 && errno == EINTR);
+        if (up == -1)
+#endif
+            up = ::sysconf(_SC_OPEN_MAX);
+        if (up == -1)
+            up = BOOST_PROCESS_POSIX_MAX_FD;
+        return up;
+    }
+
+    Predicate pred_;
+};
+
+template <class Predicate>
+close_fds_if_<Predicate> close_fds_if(const Predicate &pred)
+{
+    return close_fds_if_<Predicate>(pred);
+}
+
+}}}}
+
+#endif