close on exec atomics

[Eric Blake]

Corinna Vinschen <corinna-cygwin <at> cygwin.com> writes:

> Talking about dup3/fcntl(F_DUPFD_CLOEXEC), that's of course another
> story.  I guess we should just split it between these two items.

And don't forget pipe2, as a way of implementing popen() without a data race.

-- 
Eric Blake




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