Date: Sat, 21 Aug 1999 21:22:11 +0100 From: Brian Somers <brian@Awfulhak.org> To: "Ronald F. Guilmette" <rfg@monkeys.com> Cc: freebsd-questions@FreeBSD.ORG Subject: Re: Passing file descriptors via UNIX domain sockets Message-ID: <199908212022.VAA04816@keep.lan.Awfulhak.org> In-Reply-To: Your message of "Fri, 20 Aug 1999 23:43:40 PDT." <7989.935217820@monkeys.com>
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Take a look at the ppp(8) code - specifically at
bundle_ReceiveDatalink() and bundle_SendDatalink() in bundle.c.
> Greetings,
>
> I'm trying to figure out exactly how to pass file descriptors between
> programs.
>
> It appears that the examples given in Stevens' ``UNIX Network Programming''
> (original edition) on pages 308-312 no longer accurately describes what one
> must do to actually pass file descriptors.
>
> The man page for recvmsg(2) definitely provides some clues regarding the
> new programatic idiom that must be used to pass files descriptors around,
> but it is a little too terse, saying only:
>
> Open file descriptors are now passed as ancillary data for
> AF_UNIX domain sockets, with cmsg_level set to SOL_SOCKET
> and cmsg_type set to SCM_RIGHTS.
>
> It would be REALLY helpful for me to be able to actually _see_ an example
> of some real working code that used the new style for file descriptor passing
> between processes. Then I could just mimic that code in a monkey-see /
> monkey-do fashion.
>
> So can anyone point me at a _current_ hunk of example code that shows open
> file descriptors being passed between programs? If so, I would be much
> obliged.
>
>
> -- rfg
--
Brian <brian@Awfulhak.org> <brian@FreeBSD.org>
<http://www.Awfulhak.org>; <brian@OpenBSD.org>
Don't _EVER_ lose your sense of humour ! <brian@FreeBSD.org.uk>
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