public static unsafe Task?GetAddrInfoAsync(string hostName, bool justAddresses, AddressFamily addressFamily, CancellationToken _)
{
Debug.Assert(hostName is not null);
if (hostName.Length == 0)
{
// To match documented behavior on Windows, if an empty string is passed in, use the local host's name.
hostName = Dns.GetHostName();
}
GetHostEntryForNameContext *context = GetHostEntryForNameContext.AllocateContext();
GetHostEntryForNameState state;
try
{
state = new GetHostEntryForNameState(hostName, justAddresses);
context->State = state.CreateHandle();
}
catch
{
GetHostEntryForNameContext.FreeContext(context);
throw;
}
int errorCode = Interop.Sys.GetHostEntryForNameAsync(hostName, addressFamily, &context->Result, &GetHostEntryForNameCallback);
if (errorCode != 0)
{
ProcessResult(GetSocketErrorForNativeError(errorCode), context);
}
return(state.Task);
}
private static unsafe void ProcessResult(SocketError errorCode, GetHostEntryForNameContext *context)
{
try
{
GetHostEntryForNameState state = GetHostEntryForNameState.FromHandleAndFree(context->State);
if (errorCode == SocketError.Success)
{
ParseHostEntry(context->Result, state.JustAddresses, out string?hostName, out string[] aliases, out IPAddress[] addresses);