// RecvFrom(u32 sock, u32 flags) -> (i32 ret, u32 bsd_errno, u32 addrlen, buffer<i8, 0x22, 0> message, buffer<nn::socket::sockaddr_in, 0x22, 0x10>)
public ResultCode RecvFrom(ServiceCtx context)
{
int socketFd = context.RequestData.ReadInt32();
BsdSocketFlags socketFlags = (BsdSocketFlags)context.RequestData.ReadInt32();
(ulong receivePosition, ulong receiveLength) = context.Request.GetBufferType0x22(0);
(ulong sockAddrOutPosition, ulong sockAddrOutSize) = context.Request.GetBufferType0x22(1);
WritableRegion receiveRegion = context.Memory.GetWritableRegion(receivePosition, (int)receiveLength);
LinuxError errno = LinuxError.EBADF;
ISocket socket = _context.RetrieveSocket(socketFd);
int result = -1;
if (socket != null)
{
errno = socket.ReceiveFrom(out result, receiveRegion.Memory.Span, receiveRegion.Memory.Span.Length, socketFlags, out IPEndPoint endPoint);
if (errno == LinuxError.SUCCESS)
{
SetResultErrno(socket, result);
receiveRegion.Dispose();
context.Memory.Write(sockAddrOutPosition, BsdSockAddr.FromIPEndPoint(endPoint));
}
}
return(WriteBsdResult(context, result, errno));
}
public static BsdSockAddr FromIPEndPoint(IPEndPoint endpoint)
{
BsdSockAddr result = new BsdSockAddr
{
Length = 0,
Family = (byte)endpoint.AddressFamily,
Port = (ushort)IPAddress.HostToNetworkOrder((short)endpoint.Port)
};
endpoint.Address.GetAddressBytes().AsSpan().CopyTo(result.Address.AsSpan());
return(result);
}
private void WriteSockAddr(ServiceCtx context, ulong bufferPosition, ISocket socket, bool isRemote)
{
IPEndPoint endPoint = isRemote ? socket.RemoteEndPoint : socket.LocalEndPoint;
context.Memory.Write(bufferPosition, BsdSockAddr.FromIPEndPoint(endPoint));
}
