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In Linux select() typically supports up to 1024 file descriptors. This can be a problem when user tries to boot up many guests. Switching to poll() has minimum impact on existing code and has better scalibility. pollfd array is dynamically allocated / reallocated. If the array fails to expand, we just ignore the incoming fd. Updated: reset *_pollfd after use. This fixes regression 14869. Also remove unused slave_pollfd in strcut domain. Signed-off-by: Wei Liu <wei.liu2@citrix.com> Acked-by: Ian Campbell <ian.campbell@citrix.com> Committed-by: Ian Campbell <ian.campbell@citrix.com>