Pass compulsory mode argument to open when O_CREAT is used
#3607
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From `man 2 open`: > The mode argument must be supplied if O_CREAT or O_TMPFILE is > specified in flags; if it is not supplied, some arbitrary bytes > from the stack will be applied as the file mode.
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From
man 2 open:(Fix broken build on Fedora Rawhide: https://download.copr.fedorainfracloud.org/results/teohhanhui/fex-emu/fedora-rawhide-aarch64/07399392-fex-emu/builder-live.log.gz)