#ifndef CCAN_IO_BACKEND_H
#define CCAN_IO_BACKEND_H
#include <stdbool.h>
-#include <ccan/timer/timer.h>
-#include <poll.h>
-
-/* A setting for actions to always run (eg. zero-length reads). */
-#define POLLALWAYS (((POLLIN|POLLOUT) + 1) & ~((POLLIN|POLLOUT)))
-
-struct io_alloc {
- void *(*alloc)(size_t size);
- void *(*realloc)(void *ptr, size_t size);
- void (*free)(void *ptr);
-};
-extern struct io_alloc io_alloc;
+#include "io_plan.h"
+#include <ccan/list/list.h>
struct fd {
int fd;
bool listener;
+ /* We could put these in io_plan, but they pack nicely here */
+ bool exclusive[2];
size_t backend_info;
};
struct io_listener {
struct fd fd;
+ const tal_t *ctx;
+
/* These are for connections we create. */
- void (*init)(int fd, void *arg);
+ struct io_plan *(*init)(struct io_conn *conn, void *arg);
void *arg;
};
-struct io_timeout {
- struct timer timer;
- struct io_conn *conn;
+enum io_plan_status {
+ /* As before calling next function. */
+ IO_UNSET,
+ /* Normal, but haven't started yet. */
+ IO_POLLING_NOTSTARTED,
+ IO_POLLING_STARTED,
+ /* Waiting for io_wake */
+ IO_WAITING,
+ /* Always do this. */
+ IO_ALWAYS
+};
- struct io_plan (*next)(struct io_conn *, void *arg);
+/**
+ * struct io_plan - one half of I/O to do
+ * @status: the status of this plan.
+ * @dir: are we plan[0] or plan[1] inside io_conn?
+ * @io: function to call when fd becomes read/writable, returns 0 to be
+ * called again, 1 if it's finished, and -1 on error (fd will be closed)
+ * @next: the next function which is called if io returns 1.
+ * @next_arg: the argument to @next
+ * @u1, @u2: scratch space for @io.
+ */
+struct io_plan {
+ enum io_plan_status status;
+ enum io_direction dir;
+
+ int (*io)(int fd, struct io_plan_arg *arg);
+
+ struct io_plan *(*next)(struct io_conn *, void *next_arg);
void *next_arg;
+
+ struct io_plan_arg arg;
};
/* One connection per client. */
void (*finish)(struct io_conn *, void *arg);
void *finish_arg;
- struct io_conn *duplex;
- struct io_timeout *timeout;
-
- struct io_plan plan;
+ struct io_plan plan[2];
};
-static inline bool timeout_active(const struct io_conn *conn)
-{
- return conn->timeout && conn->timeout->conn;
-}
-
extern void *io_loop_return;
-#ifdef DEBUG
-extern struct io_conn *current;
-static inline void set_current(struct io_conn *conn)
-{
- current = conn;
-}
-static inline bool doing_debug_on(struct io_conn *conn)
-{
- return io_debug_conn && io_debug_conn(conn);
-}
-static inline bool doing_debug(void)
-{
- return io_debug_conn;
-}
-#else
-static inline void set_current(struct io_conn *conn)
-{
-}
-static inline bool doing_debug_on(struct io_conn *conn)
-{
- return false;
-}
-static inline bool doing_debug(void)
-{
- return false;
-}
-#endif
-
bool add_listener(struct io_listener *l);
bool add_conn(struct io_conn *c);
bool add_duplex(struct io_conn *c);
void del_listener(struct io_listener *l);
-void backend_plan_changed(struct io_conn *conn);
-void backend_wait_changed(const void *wait);
-void backend_add_timeout(struct io_conn *conn, struct timerel duration);
-void backend_del_timeout(struct io_conn *conn);
-void backend_del_conn(struct io_conn *conn);
+void cleanup_conn_without_close(struct io_conn *c);
+bool backend_new_always(struct io_plan *plan);
+void backend_new_plan(struct io_conn *conn);
+void backend_plan_done(struct io_conn *conn);
+bool backend_set_exclusive(struct io_plan *plan, bool exclusive);
+
+void backend_wake(const void *wait);
-void io_ready(struct io_conn *conn);
+void io_ready(struct io_conn *conn, int pollflags);
+void io_do_always(struct io_plan *conn);
+void io_do_wakeup(struct io_conn *conn, enum io_direction dir);
void *do_io_loop(struct io_conn **ready);
#endif /* CCAN_IO_BACKEND_H */