struct sr_hwcap_option *sr_find_hwcap_option(int hwcap);
void sr_source_remove(int fd);
void sr_source_add(int fd, int events, int timeout,
struct sr_hwcap_option *sr_find_hwcap_option(int hwcap);
void sr_source_remove(int fd);
void sr_source_add(int fd, int events, int timeout,