| // |
| // detail/impl/descriptor_ops.ipp |
| // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
| // |
| // Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com) |
| // |
| // 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_ASIO_DETAIL_IMPL_DESCRIPTOR_OPS_IPP |
| #define BOOST_ASIO_DETAIL_IMPL_DESCRIPTOR_OPS_IPP |
| |
| #if defined(_MSC_VER) && (_MSC_VER >= 1200) |
| # pragma once |
| #endif // defined(_MSC_VER) && (_MSC_VER >= 1200) |
| |
| #include <boost/asio/detail/config.hpp> |
| #include <cerrno> |
| #include <boost/asio/detail/descriptor_ops.hpp> |
| #include <boost/asio/error.hpp> |
| |
| #if !defined(BOOST_WINDOWS) && !defined(__CYGWIN__) |
| |
| #include <boost/asio/detail/push_options.hpp> |
| |
| namespace boost { |
| namespace asio { |
| namespace detail { |
| namespace descriptor_ops { |
| |
| int open(const char* path, int flags, boost::system::error_code& ec) |
| { |
| errno = 0; |
| int result = error_wrapper(::open(path, flags), ec); |
| if (result >= 0) |
| ec = boost::system::error_code(); |
| return result; |
| } |
| |
| int close(int d, state_type& state, boost::system::error_code& ec) |
| { |
| int result = 0; |
| if (d != -1) |
| { |
| if (state & internal_non_blocking) |
| { |
| #if defined(__SYMBIAN32__) |
| int flags = ::fcntl(d, F_GETFL, 0); |
| if (flags >= 0) |
| ::fcntl(d, F_SETFL, flags & ~O_NONBLOCK); |
| #else // defined(__SYMBIAN32__) |
| ioctl_arg_type arg = 0; |
| ::ioctl(d, FIONBIO, &arg); |
| #endif // defined(__SYMBIAN32__) |
| state &= ~internal_non_blocking; |
| } |
| |
| errno = 0; |
| result = error_wrapper(::close(d), ec); |
| } |
| |
| if (result == 0) |
| ec = boost::system::error_code(); |
| return result; |
| } |
| |
| bool set_internal_non_blocking(int d, |
| state_type& state, boost::system::error_code& ec) |
| { |
| if (d == -1) |
| { |
| ec = boost::asio::error::bad_descriptor; |
| return false; |
| } |
| |
| errno = 0; |
| #if defined(__SYMBIAN32__) |
| int result = error_wrapper(::fcntl(d, F_GETFL, 0), ec); |
| if (result >= 0) |
| { |
| errno = 0; |
| result = error_wrapper(::fcntl(d, F_SETFL, result | O_NONBLOCK), ec); |
| } |
| #else // defined(__SYMBIAN32__) |
| ioctl_arg_type arg = 1; |
| int result = error_wrapper(::ioctl(d, FIONBIO, &arg), ec); |
| #endif // defined(__SYMBIAN32__) |
| |
| if (result >= 0) |
| { |
| ec = boost::system::error_code(); |
| state |= internal_non_blocking; |
| return true; |
| } |
| |
| return false; |
| } |
| |
| std::size_t sync_read(int d, state_type state, buf* bufs, |
| std::size_t count, bool all_empty, boost::system::error_code& ec) |
| { |
| if (d == -1) |
| { |
| ec = boost::asio::error::bad_descriptor; |
| return 0; |
| } |
| |
| // A request to read 0 bytes on a stream is a no-op. |
| if (all_empty) |
| { |
| ec = boost::system::error_code(); |
| return 0; |
| } |
| |
| // Read some data. |
| for (;;) |
| { |
| // Try to complete the operation without blocking. |
| errno = 0; |
| int bytes = error_wrapper(::readv(d, bufs, static_cast<int>(count)), ec); |
| |
| // Check if operation succeeded. |
| if (bytes > 0) |
| return bytes; |
| |
| // Check for EOF. |
| if (bytes == 0) |
| { |
| ec = boost::asio::error::eof; |
| return 0; |
| } |
| |
| // Operation failed. |
| if ((state & user_set_non_blocking) |
| || (ec != boost::asio::error::would_block |
| && ec != boost::asio::error::try_again)) |
| return 0; |
| |
| // Wait for descriptor to become ready. |
| if (descriptor_ops::poll_read(d, ec) < 0) |
| return 0; |
| } |
| } |
| |
| bool non_blocking_read(int d, buf* bufs, std::size_t count, |
| boost::system::error_code& ec, std::size_t& bytes_transferred) |
| { |
| for (;;) |
| { |
| // Read some data. |
| errno = 0; |
| int bytes = error_wrapper(::readv(d, bufs, static_cast<int>(count)), ec); |
| |
| // Check for end of stream. |
| if (bytes == 0) |
| { |
| ec = boost::asio::error::eof; |
| return true; |
| } |
| |
| // Retry operation if interrupted by signal. |
| if (ec == boost::asio::error::interrupted) |
| continue; |
| |
| // Check if we need to run the operation again. |
| if (ec == boost::asio::error::would_block |
| || ec == boost::asio::error::try_again) |
| return false; |
| |
| // Operation is complete. |
| if (bytes > 0) |
| { |
| ec = boost::system::error_code(); |
| bytes_transferred = bytes; |
| } |
| else |
| bytes_transferred = 0; |
| |
| return true; |
| } |
| } |
| |
| std::size_t sync_write(int d, state_type state, const buf* bufs, |
| std::size_t count, bool all_empty, boost::system::error_code& ec) |
| { |
| if (d == -1) |
| { |
| ec = boost::asio::error::bad_descriptor; |
| return 0; |
| } |
| |
| // A request to write 0 bytes on a stream is a no-op. |
| if (all_empty) |
| { |
| ec = boost::system::error_code(); |
| return 0; |
| } |
| |
| // Write some data. |
| for (;;) |
| { |
| // Try to complete the operation without blocking. |
| errno = 0; |
| int bytes = error_wrapper(::writev(d, bufs, static_cast<int>(count)), ec); |
| |
| // Check if operation succeeded. |
| if (bytes > 0) |
| return bytes; |
| |
| // Operation failed. |
| if ((state & user_set_non_blocking) |
| || (ec != boost::asio::error::would_block |
| && ec != boost::asio::error::try_again)) |
| return 0; |
| |
| // Wait for descriptor to become ready. |
| if (descriptor_ops::poll_write(d, ec) < 0) |
| return 0; |
| } |
| } |
| |
| bool non_blocking_write(int d, const buf* bufs, std::size_t count, |
| boost::system::error_code& ec, std::size_t& bytes_transferred) |
| { |
| for (;;) |
| { |
| // Write some data. |
| errno = 0; |
| int bytes = error_wrapper(::writev(d, bufs, static_cast<int>(count)), ec); |
| |
| // Retry operation if interrupted by signal. |
| if (ec == boost::asio::error::interrupted) |
| continue; |
| |
| // Check if we need to run the operation again. |
| if (ec == boost::asio::error::would_block |
| || ec == boost::asio::error::try_again) |
| return false; |
| |
| // Operation is complete. |
| if (bytes >= 0) |
| { |
| ec = boost::system::error_code(); |
| bytes_transferred = bytes; |
| } |
| else |
| bytes_transferred = 0; |
| |
| return true; |
| } |
| } |
| |
| int ioctl(int d, state_type& state, long cmd, |
| ioctl_arg_type* arg, boost::system::error_code& ec) |
| { |
| if (d == -1) |
| { |
| ec = boost::asio::error::bad_descriptor; |
| return -1; |
| } |
| |
| errno = 0; |
| int result = error_wrapper(::ioctl(d, cmd, arg), ec); |
| |
| if (result >= 0) |
| { |
| ec = boost::system::error_code(); |
| |
| // When updating the non-blocking mode we always perform the ioctl syscall, |
| // even if the flags would otherwise indicate that the descriptor is |
| // already in the correct state. This ensures that the underlying |
| // descriptor is put into the state that has been requested by the user. If |
| // the ioctl syscall was successful then we need to update the flags to |
| // match. |
| if (cmd == static_cast<long>(FIONBIO)) |
| { |
| if (*arg) |
| { |
| state |= user_set_non_blocking; |
| } |
| else |
| { |
| // Clearing the non-blocking mode always overrides any internally-set |
| // non-blocking flag. Any subsequent asynchronous operations will need |
| // to re-enable non-blocking I/O. |
| state &= ~(user_set_non_blocking | internal_non_blocking); |
| } |
| } |
| } |
| |
| return result; |
| } |
| |
| int fcntl(int d, long cmd, boost::system::error_code& ec) |
| { |
| if (d == -1) |
| { |
| ec = boost::asio::error::bad_descriptor; |
| return -1; |
| } |
| |
| errno = 0; |
| int result = error_wrapper(::fcntl(d, cmd), ec); |
| if (result != -1) |
| ec = boost::system::error_code(); |
| return result; |
| } |
| |
| int fcntl(int d, long cmd, long arg, boost::system::error_code& ec) |
| { |
| if (d == -1) |
| { |
| ec = boost::asio::error::bad_descriptor; |
| return -1; |
| } |
| |
| errno = 0; |
| int result = error_wrapper(::fcntl(d, cmd, arg), ec); |
| if (result != -1) |
| ec = boost::system::error_code(); |
| return result; |
| } |
| |
| int poll_read(int d, boost::system::error_code& ec) |
| { |
| if (d == -1) |
| { |
| ec = boost::asio::error::bad_descriptor; |
| return -1; |
| } |
| |
| pollfd fds; |
| fds.fd = d; |
| fds.events = POLLIN; |
| fds.revents = 0; |
| errno = 0; |
| int result = error_wrapper(::poll(&fds, 1, -1), ec); |
| if (result >= 0) |
| ec = boost::system::error_code(); |
| return result; |
| } |
| |
| int poll_write(int d, boost::system::error_code& ec) |
| { |
| if (d == -1) |
| { |
| ec = boost::asio::error::bad_descriptor; |
| return -1; |
| } |
| |
| pollfd fds; |
| fds.fd = d; |
| fds.events = POLLOUT; |
| fds.revents = 0; |
| errno = 0; |
| int result = error_wrapper(::poll(&fds, 1, -1), ec); |
| if (result >= 0) |
| ec = boost::system::error_code(); |
| return result; |
| } |
| |
| } // namespace descriptor_ops |
| } // namespace detail |
| } // namespace asio |
| } // namespace boost |
| |
| #include <boost/asio/detail/pop_options.hpp> |
| |
| #endif // !defined(BOOST_WINDOWS) && !defined(__CYGWIN__) |
| |
| #endif // BOOST_ASIO_DETAIL_IMPL_DESCRIPTOR_OPS_IPP |