This patchset adds new interfaces to work with iohandlers. It adds:
int assign_fd_handlers(int fd, IOHandlerOps *ops, void *opaque)
-- Specify io handlers for an fd
int remove_fd_handlers(int fd)
-- Remove fd handlers for fd (mark ioh for deletion)
int set_read_poll_fd_action(int fd, bool enable)
-- Enable or disable the fd_read_poll fd handler
int set_read_fd_action(int fd, bool enable)
-- Enable or disable the fd_read fd handler
int set_write_fd_action(int fd, bool enable)
-- Enable or disable the fd_read fd handler
A new struct, IOHandlerOps, is added, to collect all the ops together
instead of passing individual ones to functions.
The older function, qemu_set_fd_handler2(), is now a wrapper to
assign_fd_handlers() and can be deprecated by converting the existing
usage to assign_fd_handlers().