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 //
 // detail/impl/descriptor_ops.ipp
 // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 //
 // Copyright (c) 2003-2024 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_ASIO_WINDOWS) \
   && !defined(BOOST_ASIO_WINDOWS_RUNTIME) \
   && !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)
 {
   int result = ::open(path, flags);
   get_last_error(ec, result < 0);
   return result;
 }
 
 int open(const char* path, int flags,
     unsigned mode, boost::system::error_code& ec)
 {
   int result = ::open(path, flags, mode);
   get_last_error(ec, result < 0);
   return result;
 }
 
 int close(int d, state_type& state, boost::system::error_code& ec)
 {
   int result = 0;
   if (d != -1)
   {
     result = ::close(d);
     get_last_error(ec, result < 0);
 
     if (result != 0
         && (ec == boost::asio::error::would_block
           || ec == boost::asio::error::try_again))
     {
       // According to UNIX Network Programming Vol. 1, it is possible for
       // close() to fail with EWOULDBLOCK under certain circumstances. What
       // isn't clear is the state of the descriptor after this error. The one
       // current OS where this behaviour is seen, Windows, says that the socket
       // remains open. Therefore we'll put the descriptor back into blocking
       // mode and have another attempt at closing it.
 #if defined(__SYMBIAN32__) || defined(__EMSCRIPTEN__)
       int flags = ::fcntl(d, F_GETFL, 0);
       if (flags >= 0)
         ::fcntl(d, F_SETFL, flags & ~O_NONBLOCK);
 #else // defined(__SYMBIAN32__) || defined(__EMSCRIPTEN__)
       ioctl_arg_type arg = 0;
       if ((state & possible_dup) == 0)
       {
         result = ::ioctl(d, FIONBIO, &arg);
         get_last_error(ec, result < 0);
       }
       if ((state & possible_dup) != 0
 # if defined(ENOTTY)
           || ec.value() == ENOTTY
 # endif // defined(ENOTTY)
 # if defined(ENOTCAPABLE)
           || ec.value() == ENOTCAPABLE
 # endif // defined(ENOTCAPABLE)
         )
       {
         int flags = ::fcntl(d, F_GETFL, 0);
         if (flags >= 0)
           ::fcntl(d, F_SETFL, flags & ~O_NONBLOCK);
       }
 #endif // defined(__SYMBIAN32__) || defined(__EMSCRIPTEN__)
       state &= ~non_blocking;
 
       result = ::close(d);
       get_last_error(ec, result < 0);
     }
   }
 
   return result;
 }
 
 bool set_user_non_blocking(int d, state_type& state,
     bool value, boost::system::error_code& ec)
 {
   if (d == -1)
   {
     ec = boost::asio::error::bad_descriptor;
     return false;
   }
 
 #if defined(__SYMBIAN32__) || defined(__EMSCRIPTEN__)
   int result = ::fcntl(d, F_GETFL, 0);
   get_last_error(ec, result < 0);
   if (result >= 0)
   {
     int flag = (value ? (result | O_NONBLOCK) : (result & ~O_NONBLOCK));
     result = (flag != result) ? ::fcntl(d, F_SETFL, flag) : 0;
     get_last_error(ec, result < 0);
   }
 #else // defined(__SYMBIAN32__) || defined(__EMSCRIPTEN__)
   ioctl_arg_type arg = (value ? 1 : 0);
   int result = 0;
   if ((state & possible_dup) == 0)
   {
     result = ::ioctl(d, FIONBIO, &arg);
     get_last_error(ec, result < 0);
   }
   if ((state & possible_dup) != 0
 # if defined(ENOTTY)
       || ec.value() == ENOTTY
 # endif // defined(ENOTTY)
 # if defined(ENOTCAPABLE)
       || ec.value() == ENOTCAPABLE
 # endif // defined(ENOTCAPABLE)
     )
   {
     result = ::fcntl(d, F_GETFL, 0);
     get_last_error(ec, result < 0);
     if (result >= 0)
     {
       int flag = (value ? (result | O_NONBLOCK) : (result & ~O_NONBLOCK));
       result = (flag != result) ? ::fcntl(d, F_SETFL, flag) : 0;
       get_last_error(ec, result < 0);
     }
   }
 #endif // defined(__SYMBIAN32__) || defined(__EMSCRIPTEN__)
 
   if (result >= 0)
   {
     if (value)
       state |= user_set_non_blocking;
     else
     {
       // Clearing the user-set 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 true;
   }
 
   return false;
 }
 
 bool set_internal_non_blocking(int d, state_type& state,
     bool value, boost::system::error_code& ec)
 {
   if (d == -1)
   {
     ec = boost::asio::error::bad_descriptor;
     return false;
   }
 
   if (!value && (state & user_set_non_blocking))
   {
     // It does not make sense to clear the internal non-blocking flag if the
     // user still wants non-blocking behaviour. Return an error and let the
     // caller figure out whether to update the user-set non-blocking flag.
     ec = boost::asio::error::invalid_argument;
     return false;
   }
 
 #if defined(__SYMBIAN32__) || defined(__EMSCRIPTEN__)
   int result = ::fcntl(d, F_GETFL, 0);
   get_last_error(ec, result < 0);
   if (result >= 0)
   {
     int flag = (value ? (result | O_NONBLOCK) : (result & ~O_NONBLOCK));
     result = (flag != result) ? ::fcntl(d, F_SETFL, flag) : 0;
     get_last_error(ec, result < 0);
   }
 #else // defined(__SYMBIAN32__) || defined(__EMSCRIPTEN__)
   ioctl_arg_type arg = (value ? 1 : 0);
   int result = 0;
   if ((state & possible_dup) == 0)
   {
     result = ::ioctl(d, FIONBIO, &arg);
     get_last_error(ec, result < 0);
   }
   if ((state & possible_dup) != 0
 # if defined(ENOTTY)
       || ec.value() == ENOTTY
 # endif // defined(ENOTTY)
 # if defined(ENOTCAPABLE)
       || ec.value() == ENOTCAPABLE
 # endif // defined(ENOTCAPABLE)
     )
   {
     result = ::fcntl(d, F_GETFL, 0);
     get_last_error(ec, result < 0);
     if (result >= 0)
     {
       int flag = (value ? (result | O_NONBLOCK) : (result & ~O_NONBLOCK));
       result = (flag != result) ? ::fcntl(d, F_SETFL, flag) : 0;
       get_last_error(ec, result < 0);
     }
   }
 #endif // defined(__SYMBIAN32__) || defined(__EMSCRIPTEN__)
 
   if (result >= 0)
   {
     if (value)
       state |= internal_non_blocking;
     else
       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)
   {
     boost::asio::error::clear(ec);
     return 0;
   }
 
   // Read some data.
   for (;;)
   {
     // Try to complete the operation without blocking.
     signed_size_type bytes = ::readv(d, bufs, static_cast<int>(count));
     get_last_error(ec, bytes < 0);
 
     // 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, 0, ec) < 0)
       return 0;
   }
 }
 
 std::size_t sync_read1(int d, state_type state, void* data,
     std::size_t size, 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 (size == 0)
   {
     boost::asio::error::clear(ec);
     return 0;
   }
 
   // Read some data.
   for (;;)
   {
     // Try to complete the operation without blocking.
     signed_size_type bytes = ::read(d, data, size);
     get_last_error(ec, bytes < 0);
 
     // 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, 0, 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.
     signed_size_type bytes = ::readv(d, bufs, static_cast<int>(count));
     get_last_error(ec, bytes < 0);
 
     // Check for end of stream.
     if (bytes == 0)
     {
       ec = boost::asio::error::eof;
       return true;
     }
 
     // Check if operation succeeded.
     if (bytes > 0)
     {
       bytes_transferred = bytes;
       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 failed.
     bytes_transferred = 0;
     return true;
   }
 }
 
 bool non_blocking_read1(int d, void* data, std::size_t size,
     boost::system::error_code& ec, std::size_t& bytes_transferred)
 {
   for (;;)
   {
     // Read some data.
     signed_size_type bytes = ::read(d, data, size);
     get_last_error(ec, bytes < 0);
 
     // Check for end of stream.
     if (bytes == 0)
     {
       ec = boost::asio::error::eof;
       return true;
     }
 
     // Check if operation succeeded.
     if (bytes > 0)
     {
       bytes_transferred = bytes;
       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 failed.
     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)
   {
     boost::asio::error::clear(ec);
     return 0;
   }
 
   // Write some data.
   for (;;)
   {
     // Try to complete the operation without blocking.
     signed_size_type bytes = ::writev(d, bufs, static_cast<int>(count));
     get_last_error(ec, bytes < 0);
 
     // 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, 0, ec) < 0)
       return 0;
   }
 }
 
 std::size_t sync_write1(int d, state_type state, const void* data,
     std::size_t size, 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 (size == 0)
   {
     boost::asio::error::clear(ec);
     return 0;
   }
 
   // Write some data.
   for (;;)
   {
     // Try to complete the operation without blocking.
     signed_size_type bytes = ::write(d, data, size);
     get_last_error(ec, bytes < 0);
 
     // 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, 0, 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.
     signed_size_type bytes = ::writev(d, bufs, static_cast<int>(count));
     get_last_error(ec, bytes < 0);
 
     // Check if operation succeeded.
     if (bytes >= 0)
     {
       bytes_transferred = bytes;
       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 failed.
     bytes_transferred = 0;
     return true;
   }
 }
 
 bool non_blocking_write1(int d, const void* data, std::size_t size,
     boost::system::error_code& ec, std::size_t& bytes_transferred)
 {
   for (;;)
   {
     // Write some data.
     signed_size_type bytes = ::write(d, data, size);
     get_last_error(ec, bytes < 0);
 
     // Check if operation succeeded.
     if (bytes >= 0)
     {
       bytes_transferred = bytes;
       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 failed.
     bytes_transferred = 0;
     return true;
   }
 }
 
 #if defined(BOOST_ASIO_HAS_FILE)
 
 std::size_t sync_read_at(int d, state_type state, uint64_t offset,
     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)
   {
     boost::asio::error::clear(ec);
     return 0;
   }
 
   // Read some data.
   for (;;)
   {
     // Try to complete the operation without blocking.
     signed_size_type bytes = ::preadv(d, bufs, static_cast<int>(count), offset);
     get_last_error(ec, bytes < 0);
 
     // 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, 0, ec) < 0)
       return 0;
   }
 }
 
 std::size_t sync_read_at1(int d, state_type state, uint64_t offset,
     void* data, std::size_t size, 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 (size == 0)
   {
     boost::asio::error::clear(ec);
     return 0;
   }
 
   // Read some data.
   for (;;)
   {
     // Try to complete the operation without blocking.
     signed_size_type bytes = ::pread(d, data, size, offset);
     get_last_error(ec, bytes < 0);
 
     // 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, 0, ec) < 0)
       return 0;
   }
 }
 
 bool non_blocking_read_at(int d, uint64_t offset, buf* bufs, std::size_t count,
     boost::system::error_code& ec, std::size_t& bytes_transferred)
 {
   for (;;)
   {
     // Read some data.
     signed_size_type bytes = ::preadv(d, bufs, static_cast<int>(count), offset);
     get_last_error(ec, bytes < 0);
 
     // Check for EOF.
     if (bytes == 0)
     {
       ec = boost::asio::error::eof;
       return true;
     }
 
     // Check if operation succeeded.
     if (bytes > 0)
     {
       bytes_transferred = bytes;
       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 failed.
     bytes_transferred = 0;
     return true;
   }
 }
 
 bool non_blocking_read_at1(int d, uint64_t offset, void* data, std::size_t size,
     boost::system::error_code& ec, std::size_t& bytes_transferred)
 {
   for (;;)
   {
     // Read some data.
     signed_size_type bytes = ::pread(d, data, size, offset);
     get_last_error(ec, bytes < 0);
 
     // Check for EOF.
     if (bytes == 0)
     {
       ec = boost::asio::error::eof;
       return true;
     }
 
     // Check if operation succeeded.
     if (bytes > 0)
     {
       bytes_transferred = bytes;
       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 failed.
     bytes_transferred = 0;
     return true;
   }
 }
 
 std::size_t sync_write_at(int d, state_type state, uint64_t offset,
     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)
   {
     boost::asio::error::clear(ec);
     return 0;
   }
 
   // Write some data.
   for (;;)
   {
     // Try to complete the operation without blocking.
     signed_size_type bytes = ::pwritev(d,
         bufs, static_cast<int>(count), offset);
     get_last_error(ec, bytes < 0);
 
     // 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, 0, ec) < 0)
       return 0;
   }
 }
 
 std::size_t sync_write_at1(int d, state_type state, uint64_t offset,
     const void* data, std::size_t size, 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 (size == 0)
   {
     boost::asio::error::clear(ec);
     return 0;
   }
 
   // Write some data.
   for (;;)
   {
     // Try to complete the operation without blocking.
     signed_size_type bytes = ::pwrite(d, data, size, offset);
     get_last_error(ec, bytes < 0);
 
     // 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, 0, ec) < 0)
       return 0;
   }
 }
 
 bool non_blocking_write_at(int d, uint64_t offset,
     const buf* bufs, std::size_t count,
     boost::system::error_code& ec, std::size_t& bytes_transferred)
 {
   for (;;)
   {
     // Write some data.
     signed_size_type bytes = ::pwritev(d,
         bufs, static_cast<int>(count), offset);
     get_last_error(ec, bytes < 0);
 
     // Check if operation succeeded.
     if (bytes >= 0)
     {
       bytes_transferred = bytes;
       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 failed.
     bytes_transferred = 0;
     return true;
   }
 }
 
 bool non_blocking_write_at1(int d, uint64_t offset,
     const void* data, std::size_t size,
     boost::system::error_code& ec, std::size_t& bytes_transferred)
 {
   for (;;)
   {
     // Write some data.
     signed_size_type bytes = ::pwrite(d, data, size, offset);
     get_last_error(ec, bytes < 0);
 
     // Check if operation succeeded.
     if (bytes >= 0)
     {
       bytes_transferred = bytes;
       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 failed.
     bytes_transferred = 0;
     return true;
   }
 }
 
 #endif // defined(BOOST_ASIO_HAS_FILE)
 
 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;
   }
 
   int result = ::ioctl(d, cmd, arg);
   get_last_error(ec, result < 0);
 
   if (result >= 0)
   {
     // 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, int cmd, boost::system::error_code& ec)
 {
   if (d == -1)
   {
     ec = boost::asio::error::bad_descriptor;
     return -1;
   }
 
   int result = ::fcntl(d, cmd);
   get_last_error(ec, result < 0);
   return result;
 }
 
 int fcntl(int d, int cmd, long arg, boost::system::error_code& ec)
 {
   if (d == -1)
   {
     ec = boost::asio::error::bad_descriptor;
     return -1;
   }
 
   int result = ::fcntl(d, cmd, arg);
   get_last_error(ec, result < 0);
   return result;
 }
 
 int poll_read(int d, state_type state, 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;
   int timeout = (state & user_set_non_blocking) ? 0 : -1;
   int result = ::poll(&fds, 1, timeout);
   get_last_error(ec, result < 0);
   if (result == 0)
     if (state & user_set_non_blocking)
       ec = boost::asio::error::would_block;
   return result;
 }
 
 int poll_write(int d, state_type state, 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;
   int timeout = (state & user_set_non_blocking) ? 0 : -1;
   int result = ::poll(&fds, 1, timeout);
   get_last_error(ec, result < 0);
   if (result == 0)
     if (state & user_set_non_blocking)
       ec = boost::asio::error::would_block;
   return result;
 }
 
 int poll_error(int d, state_type state, boost::system::error_code& ec)
 {
   if (d == -1)
   {
     ec = boost::asio::error::bad_descriptor;
     return -1;
   }
 
   pollfd fds;
   fds.fd = d;
   fds.events = POLLPRI | POLLERR | POLLHUP;
   fds.revents = 0;
   int timeout = (state & user_set_non_blocking) ? 0 : -1;
   int result = ::poll(&fds, 1, timeout);
   get_last_error(ec, result < 0);
   if (result == 0)
     if (state & user_set_non_blocking)
       ec = boost::asio::error::would_block;
   return result;
 }
 
 } // namespace descriptor_ops
 } // namespace detail
 } // namespace asio
 } // namespace boost
 
 #include <boost/asio/detail/pop_options.hpp>
 
 #endif // !defined(BOOST_ASIO_WINDOWS)
        //   && !defined(BOOST_ASIO_WINDOWS_RUNTIME)
        //   && !defined(__CYGWIN__)
 
 #endif // BOOST_ASIO_DETAIL_IMPL_DESCRIPTOR_OPS_IPP

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