1 /* Licensed under LGPLv2.1+ - see LICENSE file for details */
2 #ifndef CCAN_IO_BACKEND_H
3 #define CCAN_IO_BACKEND_H
14 /* Listeners create connections. */
20 /* These are for connections we create. */
21 struct io_plan *(*init)(struct io_conn *conn, void *arg);
26 /* As before calling next function. */
30 /* Waiting for io_wake */
34 /* Closing (both plans will be the same). */
39 * struct io_plan - one half of I/O to do
40 * @status: the status of this plan.
41 * @io: function to call when fd becomes read/writable, returns 0 to be
42 * called again, 1 if it's finished, and -1 on error (fd will be closed)
43 * @next: the next function which is called if io returns 1.
44 * @next_arg: the argument to @next
45 * @u1, @u2: scratch space for @io.
48 enum io_plan_status status;
50 int (*io)(int fd, struct io_plan_arg *arg);
52 struct io_plan *(*next)(struct io_conn *, void *next_arg);
55 struct io_plan_arg arg;
58 /* One connection per client. */
62 /* For duplex to save. */
65 /* always or closing list. */
68 void (*finish)(struct io_conn *, void *arg);
71 struct io_plan plan[2];
74 extern void *io_loop_return;
76 bool add_listener(struct io_listener *l);
77 bool add_conn(struct io_conn *c);
78 bool add_duplex(struct io_conn *c);
79 void del_listener(struct io_listener *l);
80 void backend_new_closing(struct io_conn *conn);
81 void backend_new_always(struct io_conn *conn);
82 void backend_new_plan(struct io_conn *conn);
83 void remove_from_always(struct io_conn *conn);
84 void backend_plan_done(struct io_conn *conn);
86 void backend_wake(const void *wait);
87 void backend_del_conn(struct io_conn *conn);
89 void io_ready(struct io_conn *conn, int pollflags);
90 void io_do_always(struct io_conn *conn);
91 void io_do_wakeup(struct io_conn *conn, struct io_plan *plan);
92 void *do_io_loop(struct io_conn **ready);
93 #endif /* CCAN_IO_BACKEND_H */