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SubjectRe: incompatible open modes
> 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.
> >
> > 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.


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