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Diffstat (limited to 'event.c')
| -rw-r--r-- | event.c | 302 |
1 files changed, 302 insertions, 0 deletions
@@ -0,0 +1,302 @@ +/* $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; +} |