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/* $Id: event.c 1040 2009-09-23 04:14:17Z michael $
* $URL: https://ssl.bulix.org/svn/lcd4linux/trunk/event.c $
*
* generic timer handling
*
* Copyright (C) 2009 Ed Martin <edman007@edman007.com>
* Copyright (C) 2004, 2009 The LCD4Linux Team <lcd4linux-devel@users.sourceforge.net>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
*/
/*
* exported functions:
*
* int event_add(void (*callback) (void *data), void *data, const int fd, const int read, const int write);
* Adds a file description to watch
*
* int event_del(const int fd);
* Remove an event
*
* int event_modify(const int fd, const int read, const int write, const int active);
* Modify an event
*
* int named_event_add(char *event, void (*callback) (void *data), void *data);
* Add an event identified by a string
*
* int named_event_del(char *event, void (*callback) (void *data), void *data);
* delete the event identified by this string/callback/data
*
* int named_event_trigger(char *event); //call all calbacks for this event
* call the callbacks of all events that have identified as this string
*
* int event_process(const struct timespec *delay);
* process the event list
*
* void event_exit();
* releases all events
*
*/
#include "config.h"
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <poll.h>
#include "debug.h"
#include "cfg.h"
#include "event.h"
#ifdef WITH_DMALLOC
#include <dmalloc.h>
#endif
typedef struct {
void (*callback) (event_flags_t flags, void *data);
void *data;
int fd;
int read;
int write;
int active;
int fds_id;
} event_t;
//our set of FDs
static event_t *events = NULL;
static int event_count = 0;
static void free_events(void);
int event_add(void (*callback) (event_flags_t flags, void *data), void *data, const int fd, const int read,
const int write, const int active)
{
event_count++;
events = realloc(events, sizeof(event_t) * event_count);
int i = event_count - 1;
events[i].callback = callback;
events[i].data = data;
events[i].fd = fd;
events[i].read = read;
events[i].write = write;
events[i].active = active;
events[i].fds_id = -1;
return 0;
}
int event_process(const struct timespec *timeout)
{
int i, j;
struct pollfd *fds = malloc(sizeof(struct pollfd) * event_count);
for (i = 0, j = 0; i < event_count; i++) {
events[i].fds_id = -1;
if (events[i].active) {
events[i].fds_id = j;
fds[j].events = 0;
fds[j].fd = events[i].fd;
if (events[i].read) {
fds[j].events |= POLLIN;
}
if (events[i].write) {
fds[j].events |= POLLOUT;
}
j++;
}
}
#if (__GLIBC__ >= 2 && __GLIBC_MINOR__ >= 4)
int ready = ppoll(fds, j, timeout, NULL);
#else
int ready = poll(fds, j, timeout->tv_sec * 1000 + timeout->tv_nsec / 1000000);
#endif
if (ready > 0) {
//search the file descriptors, call all relavant callbacks
for (i = 0, j = 0; i < event_count; i++) {
if (events[i].fds_id != j) {
continue;
}
if (fds[j].revents) {
int flags = 0;
if (fds[j].revents & POLLIN) {
flags |= EVENT_READ;
}
if (fds[j].revents & POLLOUT) {
flags |= EVENT_WRITE;
}
if (fds[j].revents & POLLHUP) {
flags |= EVENT_HUP;
}
if (fds[j].revents & POLLERR) {
flags |= EVENT_ERR;
}
events[i].callback(flags, events[i].data);
}
j++;
}
}
free(fds);
return 0;
}
int event_del(const int fd)
{
int i;
for (i = 0; i < event_count; i++) {
if (events[i].fd == fd) {
events[i] = events[event_count - 1];
break;
}
}
event_count--;
events = realloc(events, sizeof(event_t) * event_count);
return 0;
}
int event_modify(const int fd, const int read, const int write, const int active)
{
int i;
for (i = 0; i < event_count; i++) {
if (events[i].fd == fd) {
events[i].read = read;
events[i].write = write;
events[i].active = active;
break;
}
}
event_count--;
events = realloc(events, sizeof(event_t) * event_count);
return 0;
}
static void free_events(void)
{
if (events != NULL) {
free(events);
}
event_count = 0;
events = NULL;
}
void event_exit(void)
{
free_events();
}
/*
* Named events are the user facing side of the event subsystem
*
*/
//we rely on "=" working for copying these structs (no pointers except the callers)
typedef struct {
void (*callback) (void *data);
void *data;
} event_callback_t;
typedef struct {
char *name;
event_callback_t *c;
int callback_count;
} named_event_list_t;
static named_event_list_t *ev_names = NULL;
static int ev_count = 0;
int named_event_add(char *event, void (*callback) (void *data), void *data)
{
if (event == NULL || strlen(event) == 0) {
return 1;
}
if (callback == NULL) {
return 2;
}
int i;
for (i = 0; i < ev_count; i++) {
if (0 == strcmp(event, ev_names[i].name)) {
break;
}
}
if (i >= ev_count) {
//create the entry
ev_count++;
ev_names = realloc(ev_names, sizeof(named_event_list_t) * ev_count);
ev_names[i].name = strdup(event);
ev_names[i].callback_count = 0;
ev_names[i].c = NULL;
}
int j = ev_names[i].callback_count;
ev_names[i].callback_count++;
ev_names[i].c = realloc(ev_names[i].c, sizeof(event_callback_t) * ev_names[i].callback_count);
ev_names[i].c[j].callback = callback;
ev_names[i].c[j].data = data;
return 0;
}
int named_event_del(char *event, void (*callback) (void *data), void *data)
{
int i, j;
for (i = 0; i < ev_count; i++) {
if (0 == strcmp(event, ev_names[i].name)) {
break;
}
}
if (i >= ev_count) {
return 1; //nothing removed
}
for (j = 0; j < ev_names[i].callback_count; j++) {
if (ev_names[i].c[j].callback == callback && ev_names[i].c[j].data == data) {
ev_names[i].callback_count--;
ev_names[i].c[j] = ev_names[i].c[ev_names[i].callback_count];
ev_names[i].c = realloc(ev_names[i].c, sizeof(event_callback_t) * ev_names[i].callback_count);
if (ev_names[i].callback_count == 0) {
//drop this event
free(ev_names[i].name);
ev_count--;
ev_names[i] = ev_names[ev_count];
ev_names = realloc(ev_names, sizeof(named_event_list_t) * ev_count);
}
return 0;
}
}
return 2;
}
int named_event_trigger(char *event)
{
int i, j;
for (i = 0; i < ev_count; i++) {
if (0 == strcmp(event, ev_names[i].name)) {
for (j = 0; j < ev_names[i].callback_count; j++) {
ev_names[i].c[j].callback(ev_names[i].c[j].data);
}
return 0;
}
}
return 1;
}
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