Re: [patch 7/8] fdmap v2 - implement sys_socket2

From: Al Viro
Date: Sun Jun 10 2007 - 01:46:52 EST

On Sat, Jun 09, 2007 at 10:06:27PM -0700, Linus Torvalds wrote:
> Why the hell doesn't that thing just do an "fstat()" on the thing, and
> compare the inode number? Not that I would guarantee that it works either
> for a socket, but it would seem to make more sense than what it apparently
> does now, and I think it should work at least on Linux.

It works on Linux, all right.

> (Ie linux will give fake "st_ino" numbers to sockets. Whether anybody else
> will do that, I have no friggin clue. And you probably shouldn't depend on
> it even under Linux, but damn, despite all of those issues, it's likely
> better and more logical than what libnss-ldap apparently does now ;)

On FreeBSD it will simply give you zero st_ino on almost all sockets;
AF_UNIX ones get st_ino invented (and stable). st_dev is NODEV in all
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