/usr/include/SFML/Network/SocketUDP.h is in libcsfml-dev 1.6-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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//
// SFML - Simple and Fast Multimedia Library
// Copyright (C) 2007-2009 Laurent Gomila (laurent.gom@gmail.com)
//
// This software is provided 'as-is', without any express or implied warranty.
// In no event will the authors be held liable for any damages arising from the use of this software.
//
// Permission is granted to anyone to use this software for any purpose,
// including commercial applications, and to alter it and redistribute it freely,
// subject to the following restrictions:
//
// 1. The origin of this software must not be misrepresented;
// you must not claim that you wrote the original software.
// If you use this software in a product, an acknowledgment
// in the product documentation would be appreciated but is not required.
//
// 2. Altered source versions must be plainly marked as such,
// and must not be misrepresented as being the original software.
//
// 3. This notice may not be removed or altered from any source distribution.
//
////////////////////////////////////////////////////////////
#ifndef SFML_SOCKETUDP_H
#define SFML_SOCKETUDP_H
////////////////////////////////////////////////////////////
// Headers
////////////////////////////////////////////////////////////
#include <SFML/Config.h>
#include <SFML/Network/IPAddress.h>
#include <SFML/Network/SocketStatus.h>
#include <SFML/Network/Types.h>
////////////////////////////////////////////////////////////
/// Construct a new UDP socket
///
/// \return Pointer to the new socket
///
////////////////////////////////////////////////////////////
CSFML_API sfSocketUDP* sfSocketUDP_Create();
////////////////////////////////////////////////////////////
/// Destroy an existing UDP socket
///
/// \param Socket : Socket to destroy
///
////////////////////////////////////////////////////////////
CSFML_API void sfSocketUDP_Destroy(sfSocketUDP* Socket);
////////////////////////////////////////////////////////////
/// Change the blocking state of a UDP socket.
/// The default behaviour of a socket is blocking
///
/// \param Socket : Socket to modify
/// \param Blocking : Pass sfTrue to set the socket as blocking, or false for non-blocking
///
////////////////////////////////////////////////////////////
CSFML_API void sfSocketUDP_SetBlocking(sfSocketUDP* Socket, sfBool Blocking);
////////////////////////////////////////////////////////////
/// Bind a socket to a specific port
///
/// \param Socket : Socket to bind
/// \param Port : Port to bind the socket to
///
/// \return True if operation has been successful
///
////////////////////////////////////////////////////////////
CSFML_API sfBool sfSocketUDP_Bind(sfSocketUDP* Socket, unsigned short Port);
////////////////////////////////////////////////////////////
/// Unbind a socket from its previous port, if any
///
/// \param Socket : Socket to unbind
///
/// \return sfTrue if operation has been successful
///
////////////////////////////////////////////////////////////
CSFML_API sfBool sfSocketUDP_Unbind(sfSocketUDP* Socket);
////////////////////////////////////////////////////////////
/// Send an array of bytes
///
/// \param Socket : Socket to use for sending
/// \param Data : Pointer to the bytes to send
/// \param Size : Number of bytes to send
/// \param Address : Address of the computer to send the packet to
/// \param Port : Port to use for communication
///
/// \return Socket status
///
////////////////////////////////////////////////////////////
CSFML_API sfSocketStatus sfSocketUDP_Send(sfSocketUDP* Socket, const char* Data, size_t Size, sfIPAddress Address, unsigned short Port);
////////////////////////////////////////////////////////////
/// Receive an array of bytes.
/// This function is blocking, ie. it won't return before some
/// bytes have been received
///
/// \param Socket : Socket to use for receiving
/// \param Data : Pointer to a byte array to fill (make sure it is big enough)
/// \param MaxSize : Maximum number of bytes to read
/// \param SizeReceived : Number of bytes received
/// \param Address : Address of the computer which sent the data
/// \param Port : Port on which the remote computer sent the data
///
/// \return Socket status
///
////////////////////////////////////////////////////////////
CSFML_API sfSocketStatus sfSocketUDP_Receive(sfSocketUDP* Socket, char* Data, size_t MaxSize, size_t* SizeReceived, sfIPAddress* Address, unsigned short* Port);
////////////////////////////////////////////////////////////
/// Send a packet of data
///
/// \param Socket : Socket to use for sending
/// \param Packet : Packet to send
/// \param Address : Address of the computer to send the packet to
/// \param Port : Port to use for communication
///
/// \return Socket status
///
////////////////////////////////////////////////////////////
CSFML_API sfSocketStatus sfSocketUDP_SendPacket(sfSocketUDP* Socket, sfPacket* Packet, sfIPAddress Address, unsigned short Port);
////////////////////////////////////////////////////////////
/// Receive a packet.
/// This function is blocking, ie. it won't return before a
/// packet is received
///
/// \param Socket : Socket to use for receiving
/// \param Packet : Packet to fill with received data
/// \param Address : Address of the computer which sent the packet
/// \param Port : Port on which the remote computer sent the data
///
/// \return Socket status
///
////////////////////////////////////////////////////////////
CSFML_API sfSocketStatus sfSocketUDP_ReceivePacket(sfSocketUDP* Socket, sfPacket* Packet, sfIPAddress* Address, unsigned short* Port);
////////////////////////////////////////////////////////////
/// Check if a socket is in a valid state ; this function
/// can be called any time to check if the socket is OK
///
/// \param Socket : Socket to check
///
/// \return sfTrue if the socket is valid
///
////////////////////////////////////////////////////////////
CSFML_API sfBool sfSocketUDP_IsValid(sfSocketUDP* Socket);
#endif // SFML_SOCKETUDP_H
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