[Bug libc/10353] Methods for deleting all file descriptors greater than given integer (closefrom)

["crrodriguez at opensuse dot org" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=10353

--- Comment #22 from Cristian Rodríguez <crrodriguez at opensuse dot org> ---
(In reply to Stas Sergeev from comment #19)
> Hi.
> 
> What do you think about this closefrom() to only set
> FD_CLOEXEC rather than to do the actual close()?
> Seems more consistent to me.
> - compatible with popen(), posix_spawn(), system() and co
> as you can just do it before fork()
> - does exactly what we need, and in a less invasive way -
> don't we need to close files only at exec()?
> - clearly underlines the fact that O_CLOEXEC should have
> been on by default since the creation of posix, but its not.
> So it fixes exactly that rather than working around that by
> doing explicit close().
> 
> Just an idea.


What you request is now implemented with close_range(2) flag
CLOSE_RANGE_CLOEXEC

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