Messages in this thread | | | From | "Robert de Bath" <> | Date | Fri, 13 Aug 1999 08:20:47 +0100 (BST) | Subject | Re: Question about hard links... |
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On Thu, 12 Aug 1999, Micahel Zappe wrote:
> Does anyone out there see any problems with the second solution that could > arise? Yes.
if(link(oldfile, newfile) >= 0) unlink(oldfile); else perror("Rename failed");
> If it may cause problems, does anyone know of any popular > applications that require hard links? News demons use hard links.
Well really, you can do it but...
The only way to make symlinks reliably emulate hard links is to make it something like this:
link() { if [ -f $1 ] then NEXTNAME= ... mv $1 /linkdir/$NEXTNAME ln -s /linkdir/$NEXTNAME $1 fi LINKNAME=`readlink $1` ln -s $LINKNAME $2 }
You'll also need to do something about keeping link counts so can move the file out of the links directory when there's only one pointer at it.
UMSDOS doesn't do this so there are problems with empty directories that aren't really ...
Of course this all defeats your purpose slightly :-)
Or perhaps not, they could have a quota on the links directory too.
-- Rob. (Robert de Bath <http://poboxes.com/rdebath>) <rdebath @ poboxes.com> <http://www.cix.co.uk/~mayday>
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