Re: new module 'dup3'

[Eric Blake]

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According to Bruno Haible on 8/23/2009 4:17 PM:
> This implements the 'dup3' replacement function.
> 
> Paolo's issue of use of older Linux kernels is not yet handled.

Looks good.

> #if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__
> /* Native Woe32 API.  */
> 
>   if (flags & O_CLOEXEC)
>     {
...
>     }
> 
>   if (dup2 (oldfd, newfd) < 0)
>     return -1;

In the case where oldfd was previously marked O_NOINHERIT, dup2() on mingw
appears to create newfd as O_NOINHERIT as well.  I think we have to rework
this patch to use DuplicateHandle/_open_osfhandle on both control paths.

- --
Don't work too hard, make some time for fun as well!

Eric Blake             address@hidden
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