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From: vixie@wisdom.vix.com (Paul A Vixie)
Newsgroups: comp.unix.bsd.bsdi.misc
Subject: Re: Major bug? (probably programmer error :)
Date: 04 Sep 1995 18:22:51 GMT
Organization: Vixie Enterprises
Lines: 21
Message-ID: <VIXIE.95Sep4112251@wisdom.vix.com>
References: <42ff8m$b3d@clarknet.clark.net>
NNTP-Posting-Host: wisdom.home.vix.com
In-reply-to: alweiner@clark.net's message of 4 Sep 1995 18:07:18 GMT
> lseek(fd,-1L*sizeof(b),1);
> write(fd,&b,sizeof(b));
>
> Try running the following program on your BSDI system. I think you'll be
> supprized at the resulting test.txt.
Nope, no surprises here.
> Am I doing something illegal here?
Try this:
printf("offset: %ld\n", -1L*sizeof(b));
What you've done is to create a sparse file. Only the blocks you've written
on will be allocated. Try "ls -ls test.txt" and you'll see what I mean.
--
Paul Vixie
La Honda, CA "Illegitimi non carborundum."
<paul@vix.com>
pacbell!vixie!paul (dont let the bastards grind you down)