From owner-freebsd-net  Fri Jan 11 16:55:41 2002
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Date: Fri, 11 Jan 2002 16:55:35 -0800
From: Alfred Perlstein <bright@mu.org>
To: Abel Alejandro <elec@www.chatpr.org>
Cc: freebsd-net@freebsd.org, elec@chatpr.org
Subject: Re: Problems with inet_ntop
Message-ID: <20020111165535.U7984@elvis.mu.org>
References: <20020111204406.N98793-100000@www.chatpr.org>
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In-Reply-To: <20020111204406.N98793-100000@www.chatpr.org>; from elec@www.chatpr.org on Fri, Jan 11, 2002 at 08:49:35PM -0400
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* Abel Alejandro <elec@www.chatpr.org> [020111 16:49] wrote:
> Hello, a while ago I come with a kqueue example for FreeBSD.
> The source is at: http://www.monkeys.com/freeware/kqueue-echo.c
> 
> The problem is after getting used to the code, i wanted to know the IP of
> the incoming connections, so I used inet_ntop for this.
> 
> My problem is that on the very first connection kqueue-echo receives,
> inet_ntop prints a bad address, however after this first connection it
> starts printing the ip address correctly.
> 
> The source for the tweaked kqueue-echo.c is at:
> http://core.friendspr.com/~elec/kqueue-echo.c

static void
do_accept (register struct kevent const *const kep)
{
  auto sockaddr_in sin;
  auto socklen_t sinsiz;
  register int s;
  register ecb *ecbp;
  char ok[200];

  if ((s = accept (kep->ident, (struct sockaddr *)&sin, &sinsiz)) == -1)
    fatal ("Error in accept(): %s", strerror (errno));

OOPS!

You're missing:
  sinsiz = sizeof(sin);
before the call to accept.

-- 
-Alfred Perlstein [alfred@freebsd.org]
'Instead of asking why a piece of software is using "1970s technology,"
 start asking why software is ignoring 30 years of accumulated wisdom.'
Tax deductable donations for FreeBSD: http://www.freebsdfoundation.org/

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