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#ifndef _SEATD_POLLER_H
#define _SEATD_POLLER_H
#include <stdbool.h>
#include <stdint.h>
#include "linked_list.h"
/*
* These are the event types available from the poller.
*/
#define EVENT_READABLE 0x1
#define EVENT_WRITABLE 0x4
#define EVENT_ERROR 0x8
#define EVENT_HANGUP 0x10
/**
* The fd poller class. This must be created by poller_add_fd.
*/
struct event_source_fd;
/*
* The signal poller class. This must be created by poller_add_signal.
*/
struct event_source_signal;
/**
* The callback type used by event_source_fd, passed to poller_add_fd.
*/
typedef int (*event_source_fd_func_t)(int fd, uint32_t mask, void *data);
/**
* The interface that an event_source_fd must implement.
*/
struct event_source_fd_impl {
int (*update)(struct event_source_fd *event_source, uint32_t mask);
int (*destroy)(struct event_source_fd *event_source);
};
/**
* Removes the event_source_fd from the poller and frees the structure.
*/
int event_source_fd_destroy(struct event_source_fd *event_source);
/**
* Updates the poll mask applied to this fd, effective on the next poll.
*/
int event_source_fd_update(struct event_source_fd *event_source, uint32_t mask);
/**
* The callback type used by event_source_signal, passed to poller_add_signal.
*/
typedef int (*event_source_signal_func_t)(int signal, void *data);
/**
* The interface that an event_source_signal must implement.
*/
struct event_source_signal_impl {
int (*destroy)(struct event_source_signal *event_source);
};
/**
* Removes the event_source_siganl from the poller and frees the structure.
*/
int event_source_signal_destroy(struct event_source_signal *event_source);
/**
* The poller base class. This must be created by poller_create.
*/
struct poller {
struct linked_list signals;
struct linked_list fds;
struct pollfd *pollfds;
size_t pollfds_len;
size_t fd_event_sources;
bool pollfds_dirty;
};
/**
* The interface that a poll backend must implement.
*/
struct poll_impl {
struct poller *(*create)(void);
int (*destroy)(struct poller *);
struct event_source_fd *(*add_fd)(struct poller *, int fd, uint32_t mask,
event_source_fd_func_t func, void *data);
struct event_source_signal *(*add_signal)(struct poller *, int signal,
event_source_signal_func_t func, void *data);
int (*poll)(struct poller *);
};
/**
* Initializes the poller. The poller must be torn down with poller_finish when
* it is no longer needed.
*/
void poller_init(struct poller *poller);
/**
* De-initializes the poller. This destroys all remaining event sources and
* tears down the poller.
*/
int poller_finish(struct poller *poller);
/**
* Create an fd event source with the provided initial parameters. This event
* source must be torn down with event_source_fd_destroy when it is no longer
* needed.
*/
struct event_source_fd *poller_add_fd(struct poller *poller, int fd, uint32_t mask,
event_source_fd_func_t func, void *data);
/**
* Create signal event source with the provided initial parameters. This event
* source must be torn down with event_source_signal_destroy when it is no
* longer needed.
*/
struct event_source_signal *poller_add_signal(struct poller *poller, int signal,
event_source_signal_func_t func, void *data);
/**
* Poll the poller. I don't know what you were expecting.
*/
int poller_poll(struct poller *poller);
#endif
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