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Subject: Re: [gentoo-portage-dev] [PATCH] econf: update configure/config.{sub,guess}
 atomically to avoid races
From: Greg Turner <gmt@malth.us>
To: gentoo-portage-dev@lists.gentoo.org
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On Tue, Dec 17, 2013 at 5:58 PM, Alec Warner <antarus@gentoo.org> wrote:
> Sed is already atomic
>
> antarus@goats5 /tmp/test $ cat foo
> Debian Rocks!
> antarus@goats5 /tmp/test $ strace -e trace=file sed -i -e
> 's/Debian/Gentoo/g' foo
[snip]
> open("foo", O_RDONLY)                   = 3
> open("/proc/filesystems", O_RDONLY)     = 4
> open("./sedfDxBxl", O_RDWR|O_CREAT|O_EXCL, 0600) = 4
> rename("./sedfDxBxl", "foo")            = 0

Nice demonstration!  Been wondering about that...

-gmt