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From: Andries Brouwer <>
To: Zack Brown <>
Cc: "Ata, John" <>,
	Linux Kernel Mailing List <>
Subject: Re: incompatible open modes
Date: Thu, 31 Jul 2003 19:35:58 +0200	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <20030731170345.GJ6693@renegade>

> On Thu, Jul 31, 2003 at 12:09:14PM -0400, Ata, John wrote:

> >    the manpage on "open" states that if a file is opened "O_RDONLY|O_TRUNC",
> >    the O_TRUNC is either ignored or an error is returned.  The 2.4 kernel
> >    appears to cheerfully truncate the file on open.  I wondered which
> >    behavior is actually intended.
> >
> >    O_TRUNC
> >        If the file already exists and is a regular file  and  the open
> >        mode  allows  writing  (i.e.,  is O_RDWR or O_WRONLY) it will be
> >        truncated to length 0.  
> >        Otherwise the effect of O_TRUNC is unspecified.
> >        (On many Linux versions it will be ignored; on other versions
> >        it will return an error.)

This was just recently discussed, and it became clear that the parenthetical
remark only led to confusion. It has been deleted. Instead

       The (undefined) effect of O_RDONLY | O_TRUNC various among
       implementations.  On  many  systems  the  file is actually

has been added.


  reply	other threads:[~2003-07-31 17:36 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <>
2003-07-31 17:03 ` incompatible open modes Zack Brown
2003-07-31 17:35   ` Andries Brouwer [this message]
2003-07-31 18:29 Ata, John
2003-07-31 19:14 ` Richard B. Johnson

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