From owner-freebsd-hackers  Sun Apr 11 18:29: 8 1999
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Date: Sun, 11 Apr 1999 18:26:47 -0700 (PDT)
From: Matthew Dillon <dillon@apollo.backplane.com>
Message-Id: <199904120126.SAA11924@apollo.backplane.com>
To: Brian Feldman <green@unixhelp.org>
Cc: Jason Thorpe <thorpej@nas.nasa.gov>, jwm@CSUA.Berkeley.EDU,
	freebsd-hackers@FreeBSD.ORG
Subject: Re: read() and pread() syscalls 
References:  <Pine.BSF.4.05.9904112120340.35407-100000@janus.syracuse.net>
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:> But, see above about it not being possible to emulate read() with pread()
:> in userspace.
:
:You mean, without lseek(2) =)

    pread/pwrite + lseek is not atomic, so exact emulation is not
    possible.

					-Matt


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