/* IRCfs - IRC FileServ for *nix.
 * Copyright (C) 2002  Nick 'Zaf' Clifford <zaf@nrc.co.nz>
 * For licensing details, refer to the LICENSE file in the source 
 * code directory.
 */
#ifndef __include_select_h__
#define __include_select_h__

#include "runtime.h"

/* Select module
 * Offers a way to wait on a unix file descriptor
 */

enum select_mode { 
	select_mode_any = 0x0,
	select_mode_read = 0x01, 
	select_mode_write = 0x02,
	select_mode_error=0x04 
};
typedef void (*select_wait_func)(int fd, enum select_mode mode, void *data);
typedef void (*select_post_func)(void);
typedef void (*select_pre_func)(void);
typedef void (*select_inter_func)(void);


struct select_wait_item {
	int fd;
	enum select_mode mode;
	select_wait_func func;
	void *data;
	int deleted;
};

extern const int select_timeout_dont_care;
	
void register_wait_list(const struct select_wait_item *item);
void register_wait_item(int fd, enum select_mode mode, 
		select_wait_func func, void *data);

void unregister_wait_item(int fd, enum select_mode mode);

/* a post func gets called after select has polled all the unix fds,
 * but before it returns from select_wait.
 */
void register_post_func(select_post_func func);
/* a pre func gets called before select polls all of the unix fds.
 */
void register_pre_func(select_post_func func);
/* an inter func gets called if select gets interrupted.
 * (good for backend interrupt handlers)
 */
void register_inter_func(select_post_func func);

/* Poll the unix fds. Come back on or about time_out
 * If there are fds waiting, goes around again unless time_out is
 * NULL
 */
int select_wait(struct timeval *time_out);


time_t select_set_timeout(time_t when);

#endif