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From: fair@styx.UUCP (Erik E. Fair)
Newsgroups: net.bugs.4bsd,net.news.b
Subject: Re: Limits on 4.2BSD lseek(2)?
Message-ID: <20656@styx.UUCP>
Date: Thu, 15-May-86 13:26:05 EDT
Article-I.D.: styx.20656
Posted: Thu May 15 13:26:05 1986
Date-Received: Sat, 17-May-86 02:20:17 EDT
References: <717@smeagol.UUCP>
Organization: Lawrence Livermore Laboratory, Livermore, CA
Lines: 12
Keywords: lseek  "Netnews 2.10.3 4.3bsd-beta 6/6/85"
Xref: watmath net.bugs.4bsd:2094 net.news.b:1374

This comes about because the dbm(3) library does not guarantee to
deliver things aligned on the appropriate boundary. What you need
to do is (approximately):

	dp = fetch(key);
	bcopy(offp, dp->d_data, sizeof(offp));
	lseek(fd, *offp, 0);

Declare offp so that it is guaranteed to be aligned, and copy all
pointers you wish to dereference into it before dereff'ing them.

	Erik E. Fair	styx!fair	fair@lll-tis-b.arpa