Date: Thu, 30 Jul 1998 08:19:31 -0700 (PDT) From: David Wolfskill <dhw@whistle.com> To: freebsd-hackers@FreeBSD.ORG, vadim@tversu.ru Subject: Re: negative offset Message-ID: <199807301519.IAA16782@pau-amma.whistle.com> In-Reply-To: <19980730100202.A9992@tversu.ru>
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>Date: Thu, 30 Jul 1998 10:02:02 +0400
>From: Vadim Kolontsov <vadim@tversu.ru>
> FreeBSD (2.2.6, at least) allows to have negative offset in file (for
>example, after lseek(fd, -N, SEEK_END) in file which is smaller than N).
>What it was intended for? To have a "symmetrical behaviour" for offsets
>beyond the end or for some more practical reason? Do any other OSes have
>such behavior (for example, Solaris doesn't). Is it POSIX? Why manpages
>says nothing about it (am I miss something?) ?
>From a Solaris 2.5 "man lseek":
On success, lseek() returns the resulting pointer location,
as measured in bytes from the beginning of the file. Note
that if fildes is a remote file descriptor and offset is
negative, lseek() returns the file pointer even if it is
negative.
Sorry; my Solaris 2.6 machine is at home (where I can't get to it just
now).
david
--
David Wolfskill UNIX System Administrator
dhw@whistle.com voice: (650) 577-7158 pager: (650) 371-4621
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