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/* Licensed under LGPLv2.1+ - see LICENSE file for details */
#ifndef CCAN_IO_BACKEND_H
#define CCAN_IO_BACKEND_H
#include <stdbool.h>
#include <poll.h>
#include "io_plan.h"
#include <ccan/list/list.h>
struct fd {
int fd;
bool listener;
size_t backend_info;
};
/* Listeners create connections. */
struct io_listener {
struct fd fd;
const tal_t *ctx;
/* These are for connections we create. */
struct io_plan *(*init)(struct io_conn *conn, void *arg);
void *arg;
};
enum io_plan_status {
/* As before calling next function. */
IO_UNSET,
/* Normal. */
IO_POLLING,
/* Waiting for io_wake */
IO_WAITING,
/* Always do this. */
IO_ALWAYS,
/* Closing (both plans will be the same). */
IO_CLOSING
};
/**
* struct io_plan - one half of I/O to do
* @status: the status of this plan.
* @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;
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. */
struct io_conn {
struct fd fd;
bool debug;
/* For duplex to save. */
bool debug_saved;
/* always and closing lists. */
struct list_node always, closing;
void (*finish)(struct io_conn *, void *arg);
void *finish_arg;
struct io_plan plan[2];
};
extern void *io_loop_return;
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_new_closing(struct io_conn *conn);
void backend_new_always(struct io_conn *conn);
void backend_new_plan(struct io_conn *conn);
void remove_from_always(struct io_conn *conn);
void backend_plan_done(struct io_conn *conn);
void backend_wake(const void *wait);
void backend_del_conn(struct io_conn *conn);
void io_ready(struct io_conn *conn, int pollflags);
void io_do_always(struct io_conn *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 */
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