Date: 17 Jan 2002 14:02:48 -0800 From: swear@blarg.net (Gary W. Swearingen) To: "Mike Meyer" <mwm-dated-1011665424.930a9d@mired.org> Cc: questions@FreeBSD.ORG Subject: Re: HOWTO -- backup onto CDRs? Message-ID: <zcn0zcskjb.0zc@localhost.localdomain> In-Reply-To: <15430.12944.372926.781882@guru.mired.org> References: <15430.12944.372926.781882@guru.mired.org>
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"Mike Meyer" <mwm-dated-1011665424.930a9d@mired.org> writes:
> Gary W. Swearingen <swear@blarg.net> types:
> > Looks like /usr/include/sys/stat.h has the definitive list and it adds
> > something called a "whiteout". Never heard of it; maybe it's not
> > supported by other code, or just used by the system software. (The
> > "find" man page agrees with perl.)
>
> They get mentioned in the rm and mknod(2) man pages. Find actually
> knows about them - it's "-type w", even though it's not documented.
Oooo. Thank you very much for that. Not that I care much about
whiteouts, but the whiteout mention in mknod(2) explains why "afio"
has a bug. It's trying to use mknod(2) to create a socket and that's
said there to not be supported. (Don't ask me why it even archives
sockets (and FIFOs/pipes); I haven't a clue.)
Anybody care to fix this (from afio-2.4.7 afio.c) to create a socket
file (where asb->sb_mode has bits set for socket file type):
fd = 0;
if (exists)
if (perm != operm && chmod (name, perm) < 0)
return (warn (name, syserr ()));
else { ; }
else if (mknod (name, asb->sb_mode, (dev_t) 0) < 0
&& (errno != ENOENT
|| dirneed (name) < 0
|| mknod (name, asb->sb_mode, (dev_t) 0) < 0))
return (warn (name, syserr ()));
Or just name the functions for creating a socket file or a function
which has code similar to the above but for sockets. I'm not a C coder.
(That "dirneed" creates missing directories.)
I'm not sure if I'll code and test a fix or just pass it on to the
port or source maintainer (who doesn't do FreeBSD).
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