linux-user: add ppoll syscall support
Some architectures (like Blackfin) only implement ppoll (and skip poll). So add support for it using existing poll code. Reviewed-by: NPeter Maydell <peter.maydell@linaro.org> Signed-off-by: NMike Frysinger <vapier@gentoo.org> Signed-off-by: NRiku Voipio <riku.voipio@nokia.com>
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