Re: [PATCH] fcntl: Add 32bit filesystem mode

On Mon, 20 Apr 2020 at 16:24, Eric Blake [off-list ref] wrote:

It will be interesting to find how much code (wrongly) assumes it can
use a blind assignment of fcntl(fd, F_SETFD, 1) and thereby accidentally
wipes out other existing flags, when it should have instead been doing a
read-modify-write to protect flags other than FD_CLOEXEC.

For instance, a quick grep shows 4 instances of this in QEMU :-)

thanks
-- PMM