void dispatch_io_close(
dispatch_io_t channel,
dispatch_io_close_flags_t flags );
dispatch_io_t dispatch_io_create(
dispatch_io_type_t type,
dispatch_fd_t fd,
dispatch_queue_t queue,
void ( ^ cleanup_handler )(
int error ) );
dispatch_io_t dispatch_io_create_with_path(
dispatch_io_type_t type,
const char *path,
int oflag,
mode_t mode,
dispatch_queue_t queue,
void ( ^ cleanup_handler )(
int error ) );
void dispatch_io_read(
dispatch_io_t channel,
off_t offset,
size_t length,
dispatch_queue_t queue,
dispatch_io_handler_t io_handler );
void dispatch_io_set_high_water(
dispatch_io_t channel,
size_t high_water );
void dispatch_io_set_interval(
dispatch_io_t channel,
uint64_t interval,
dispatch_io_interval_flags_t flags );
void dispatch_io_set_low_water(
dispatch_io_t channel,
size_t low_water );
void dispatch_io_write(
dispatch_io_t channel,
off_t offset,
dispatch_data_t data,
dispatch_queue_t queue,
dispatch_io_handler_t io_handler );
void dispatch_read(
dispatch_fd_t fd,
size_t length,
dispatch_queue_t queue,
void ( ^ handler )(
dispatch_data_t data,
int error ) );
void dispatch_write(
dispatch_fd_t fd,
dispatch_data_t data,
dispatch_queue_t queue,
void ( ^ handler )(
dispatch_data_t data,
int error ) );