81 lines
2.0 KiB
C++
81 lines
2.0 KiB
C++
// Copyright (c) 2006, 2007 Julio M. Merino Vidal
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// Copyright (c) 2008 Ilya Sokolov, Boris Schaeling
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// Copyright (c) 2009 Boris Schaeling
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// Copyright (c) 2010 Felipe Tanus, Boris Schaeling
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// Copyright (c) 2011, 2012 Jeff Flinn, Boris Schaeling
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//
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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#ifndef BOOST_PROCESS_POSIX_INITIALIZERS_CLOSE_FDS_IF_HPP
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#define BOOST_PROCESS_POSIX_INITIALIZERS_CLOSE_FDS_IF_HPP
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#include <boost/process/posix/initializers/initializer_base.hpp>
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#include <boost/iterator/counting_iterator.hpp>
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#include <boost/range/counting_range.hpp>
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#include <boost/range/adaptor/filtered.hpp>
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#include <boost/range/algorithm/for_each.hpp>
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#include <unistd.h>
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#include <fcntl.h>
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#include <errno.h>
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#ifndef BOOST_PROCESS_POSIX_MAX_FD
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# define BOOST_PROCESS_POSIX_MAX_FD 32
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#endif
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namespace boost { namespace process { namespace posix { namespace initializers {
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template <class Predicate>
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class close_fds_if_ : public initializer_base
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{
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private:
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static void close(int fd)
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{
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::fcntl(fd, F_SETFD, FD_CLOEXEC);
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}
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public:
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explicit close_fds_if_(const Predicate &pred) : pred_(pred) {}
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template <class PosixExecutor>
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void on_exec_setup(PosixExecutor&) const
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{
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boost::for_each(
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boost::adaptors::filter(
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boost::counting_range(0, upper_bound()),
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pred_
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),
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close
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);
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}
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private:
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static int upper_bound()
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{
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int up;
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#if defined(F_MAXFD)
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do
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{
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up = ::fcntl(0, F_MAXFD);
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} while (up == -1 && errno == EINTR);
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if (up == -1)
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#endif
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up = ::sysconf(_SC_OPEN_MAX);
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if (up == -1)
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up = BOOST_PROCESS_POSIX_MAX_FD;
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return up;
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}
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Predicate pred_;
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};
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template <class Predicate>
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close_fds_if_<Predicate> close_fds_if(const Predicate &pred)
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{
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return close_fds_if_<Predicate>(pred);
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}
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}}}}
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#endif
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