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Message-ID: <3F974B1C.1BE6253A@dessent.net>
Date: Wed, 22 Oct 2003 20:29:32 -0700
From: Brian Dessent <brian AT dessent DOT net>
Organization: My own little world...
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To: cygwin AT cygwin DOT com
Subject: Re: select() doesn't respond
References: <20031023025857 DOT 932 DOT qmail AT web303 DOT mail DOT yahoo DOT co DOT jp>
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Takeshi Honda wrote:

>    if ((sock=socket(AF_INET,SOCK_RAW,IPPROTO_TCP))==-1){
>     printf("Can not create RAW socket.\n");
>     return -1;
>   }
> 
>   FD_ZERO(&read_fd);
>   FD_SET(sock,&read_fd);
>   select(FD_SETSIZE,&read_fd,NULL,NULL,NULL); // program
> stop here

You create a socket but you don't call bind(), connect(), or listen() on
it so I don't know what you expect to happen.  AFAIK just creating a
socket and then trying to read from it is an undefined behavior, but I
could be wrong.  If you're trying to read raw packets off the interface
you're going to need to use libpcap.  Fortunately, there is a libpcap
library for Windows (called WinPcap), and there are cygwin bindings for
it so it can be used in the same way as with linux.  There are a handful
of examples that come with the library code, so you should probably
start there.

Brian

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