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include/asio/detail/descriptor_ops.hpp

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+//
+// detail/descriptor_ops.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2025 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 ASIO_DETAIL_DESCRIPTOR_OPS_HPP
+#define ASIO_DETAIL_DESCRIPTOR_OPS_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/config.hpp"
+
+#if !defined(ASIO_WINDOWS) \
+  && !defined(ASIO_WINDOWS_RUNTIME) \
+  && !defined(__CYGWIN__)
+
+#include <cstddef>
+#include "asio/error.hpp"
+#include "asio/error_code.hpp"
+#include "asio/detail/cstdint.hpp"
+#include "asio/detail/socket_types.hpp"
+
+#include "asio/detail/push_options.hpp"
+
+namespace asio {
+namespace detail {
+namespace descriptor_ops {
+
+// Descriptor state bits.
+enum
+{
+  // The user wants a non-blocking descriptor.
+  user_set_non_blocking = 1,
+
+  // The descriptor has been set non-blocking.
+  internal_non_blocking = 2,
+
+  // Helper "state" used to determine whether the descriptor is non-blocking.
+  non_blocking = user_set_non_blocking | internal_non_blocking,
+
+  // The descriptor may have been dup()-ed.
+  possible_dup = 4
+};
+
+typedef unsigned char state_type;
+
+inline void get_last_error(
+    asio::error_code& ec, bool is_error_condition)
+{
+  if (!is_error_condition)
+  {
+    asio::error::clear(ec);
+  }
+  else
+  {
+    ec = asio::error_code(errno,
+        asio::error::get_system_category());
+  }
+}
+
+ASIO_DECL int open(const char* path, int flags,
+    asio::error_code& ec);
+
+ASIO_DECL int open(const char* path, int flags, unsigned mode,
+    asio::error_code& ec);
+
+ASIO_DECL int close(int d, state_type& state,
+    asio::error_code& ec);
+
+ASIO_DECL bool set_user_non_blocking(int d,
+    state_type& state, bool value, asio::error_code& ec);
+
+ASIO_DECL bool set_internal_non_blocking(int d,
+    state_type& state, bool value, asio::error_code& ec);
+
+typedef iovec buf;
+
+ASIO_DECL std::size_t sync_read(int d, state_type state, buf* bufs,
+    std::size_t count, bool all_empty, asio::error_code& ec);
+
+ASIO_DECL std::size_t sync_read1(int d, state_type state, void* data,
+    std::size_t size, asio::error_code& ec);
+
+ASIO_DECL bool non_blocking_read(int d, buf* bufs, std::size_t count,
+    asio::error_code& ec, std::size_t& bytes_transferred);
+
+ASIO_DECL bool non_blocking_read1(int d, void* data, std::size_t size,
+    asio::error_code& ec, std::size_t& bytes_transferred);
+
+ASIO_DECL std::size_t sync_write(int d, state_type state,
+    const buf* bufs, std::size_t count, bool all_empty,
+    asio::error_code& ec);
+
+ASIO_DECL std::size_t sync_write1(int d, state_type state,
+    const void* data, std::size_t size, asio::error_code& ec);
+
+ASIO_DECL bool non_blocking_write(int d,
+    const buf* bufs, std::size_t count,
+    asio::error_code& ec, std::size_t& bytes_transferred);
+
+ASIO_DECL bool non_blocking_write1(int d,
+    const void* data, std::size_t size,
+    asio::error_code& ec, std::size_t& bytes_transferred);
+
+#if defined(ASIO_HAS_FILE)
+
+ASIO_DECL std::size_t sync_read_at(int d, state_type state,
+    uint64_t offset, buf* bufs, std::size_t count, bool all_empty,
+    asio::error_code& ec);
+
+ASIO_DECL std::size_t sync_read_at1(int d, state_type state,
+    uint64_t offset, void* data, std::size_t size,
+    asio::error_code& ec);
+
+ASIO_DECL bool non_blocking_read_at(int d, uint64_t offset,
+    buf* bufs, std::size_t count, asio::error_code& ec,
+    std::size_t& bytes_transferred);
+
+ASIO_DECL bool non_blocking_read_at1(int d, uint64_t offset,
+    void* data, std::size_t size, asio::error_code& ec,
+    std::size_t& bytes_transferred);
+
+ASIO_DECL std::size_t sync_write_at(int d, state_type state,
+    uint64_t offset, const buf* bufs, std::size_t count, bool all_empty,
+    asio::error_code& ec);
+
+ASIO_DECL std::size_t sync_write_at1(int d, state_type state,
+    uint64_t offset, const void* data, std::size_t size,
+    asio::error_code& ec);
+
+ASIO_DECL bool non_blocking_write_at(int d,
+    uint64_t offset, const buf* bufs, std::size_t count,
+    asio::error_code& ec, std::size_t& bytes_transferred);
+
+ASIO_DECL bool non_blocking_write_at1(int d,
+    uint64_t offset, const void* data, std::size_t size,
+    asio::error_code& ec, std::size_t& bytes_transferred);
+
+#endif // defined(ASIO_HAS_FILE)
+
+ASIO_DECL int ioctl(int d, state_type& state, long cmd,
+    ioctl_arg_type* arg, asio::error_code& ec);
+
+ASIO_DECL int fcntl(int d, int cmd, asio::error_code& ec);
+
+ASIO_DECL int fcntl(int d, int cmd,
+    long arg, asio::error_code& ec);
+
+ASIO_DECL int poll_read(int d,
+    state_type state, asio::error_code& ec);
+
+ASIO_DECL int poll_write(int d,
+    state_type state, asio::error_code& ec);
+
+ASIO_DECL int poll_error(int d,
+    state_type state, asio::error_code& ec);
+
+} // namespace descriptor_ops
+} // namespace detail
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#if defined(ASIO_HEADER_ONLY)
+# include "asio/detail/impl/descriptor_ops.ipp"
+#endif // defined(ASIO_HEADER_ONLY)
+
+#endif // !defined(ASIO_WINDOWS)
+       //   && !defined(ASIO_WINDOWS_RUNTIME)
+       //   && !defined(__CYGWIN__)
+
+#endif // ASIO_DETAIL_DESCRIPTOR_OPS_HPP