Re: Question about I_SENDFD

From: Alexander Viro (
Date: Thu Sep 07 2000 - 05:02:00 EST

On Thu, 7 Sep 2000, Andrey G. Kaplanov wrote:

> Respected colleagues!
> In advanced Unix systems, including SCO UnixWare, SUN OS
> there is a facility of transmission of descriptor of openning file
> through stream, by means of the command ioctl I_SENDFD.

        Linux has no streams. It's Missed'em'Vism and it's not supported.
Use sockets.

> For instance, following command writes transDsc descriptor to the stream streamDsc.
> int ret = ioctl(streamDsc, I_SENDFD, transDsc);
> On Red Hat Linux kernel 2.2.16 ret is -1, errno is 22 - Invalid argument.
> That is here done not so, or be other ways of transmission of file descriptor between processes?

        Same as on every sane UNIX system. sendmsg() on AF_UNIX socket with
SCM_RIGHTS cookie.

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