Path: utzoo!attcan!uunet!auspex!guy
From: guy@auspex.auspex.com (Guy Harris)
Newsgroups: comp.unix.questions
Subject: Re: How to transfer file descriptors with UNIX domain sockets?
Message-ID: <3597@auspex.auspex.com>
Date: 2 Jul 90 18:00:54 GMT
References: <1990Jul01.130157.3627@virtech.uucp> <10981@hydra.gatech.EDU>
Organization: Auspex Systems, Santa Clara
Lines: 11

>I'm sure that it *can* be done - my question is what was it in Oliver
>Laumann's code that informed the kernel that what was in the message was a
>file descriptor?

It was

    msg.msg_accrights = (caddr_t)&fd;
    msg.msg_accrightslen = sizeof (fd);

I.e., the "access rights" in a message sent down a UNIX-domain socket
are, by definition, file descriptors....