Re: Slow name-server lookups

Alan Cox (alan@lxorguk.ukuu.org.uk)
Mon, 1 Mar 1999 19:34:21 +0000 (GMT)

> This is what glibc-2.0.6 gethostbyname() does.
>
> socket(PF_INET, SOCK_DGRAM, IPPROTO_IP) = 3
> connect(3, {sin_family=AF_INET, sin_port=htons(53),
> sin_addr=inet_addr("204.178.40.210")}, 16) = 0

> It takes time to establish a connection. Looking at the glibc-2.0.6 code
> I see that the 'connection' is a trick to get a 'connection-refused'

The UDP connect code is just internal book-keeping not a connection over
a network. So its one, fast, syscall

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