O_CREAT |?O_EXCL with ofstream

[Jonathan Wakely]

On Fri, May 28, 2004 at 06:07:15PM +0200, Herv? Eychenne wrote:

>  Hi,
> 
> I used to use:
>  int fd = open("file", O_CREAT |?O_EXCL);
>  ofstream os(fd);
> but ofstream::ofstream(int fd) has also been deprecated (sigh), so
> I see no way anymore to atomically ensure that a file was not already
> existing when creating a new one.
> I've searched everywhere on the Web, and I could only find a
> reference of a ios_base::noreplace which does not seem to exist.
> 
> So how do I get an ofstream while ensuring atomicity? (O_CREAT |?O_EXCL behaviour)
> Any clue?

Which compiler version are you using?

Have you looked at the <ext/stdio_filebuf.h> header?

See http://gcc.gnu.org/onlinedocs/libstdc++/27_io/howto.html#11

jon


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