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/*
Unix SMB/CIFS implementation.
main select loop and event handling
wrapper for http://liboop.org/
Copyright (C) Stefan Metzmacher 2005
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 of the License, 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.
*/
#include "includes.h"
#include "lib/events/events.h"
#include "lib/events/events_internal.h"
#include <oop.h>
/*
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
NOTE: this code compiles fine, but is completly *UNTESTED*
and is only commited as example
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
*/
static int oop_event_context_destructor(void *ptr)
{
struct event_context *ev = talloc_get_type(ptr, struct event_context);
oop_source_sys *oop_sys = ev->additional_data;
oop_sys_delete(oop_sys);
return 0;
}
/*
create a oop_event_context structure.
*/
static int oop_event_context_init(struct event_context *ev, void *private_data)
{
oop_source_sys *oop_sys = private_data;
if (!oop_sys) {
oop_sys = oop_sys_new();
if (!oop_sys) {
return -1;
}
talloc_set_destructor(ev, oop_event_context_destructor);
}
ev->additional_data = oop_sys;
return 0;
}
static void *oop_event_fd_handler(oop_source *oop, int fd, oop_event oop_type, void *ptr)
{
struct fd_event *fde = ptr;
if (fd != fde->fd) return OOP_ERROR;
switch(oop_type) {
case OOP_READ:
fde->handler(fde->event_ctx, fde, EVENT_FD_READ, fde->private_data);
return OOP_CONTINUE;
case OOP_WRITE:
fde->handler(fde->event_ctx, fde, EVENT_FD_WRITE, fde->private_data);
return OOP_CONTINUE;
case OOP_EXCEPTION:
return OOP_ERROR;
case OOP_NUM_EVENTS:
return OOP_ERROR;
}
return OOP_ERROR;
}
/*
destroy an fd_event
*/
static int oop_event_fd_destructor(void *ptr)
{
struct fd_event *fde = talloc_get_type(ptr, struct fd_event);
struct event_context *ev = fde->event_ctx;
oop_source_sys *oop_sys = ev->additional_data;
oop_source *oop = oop_sys_source(oop_sys);
if (fde->flags & EVENT_FD_READ)
oop->cancel_fd(oop, fde->fd, OOP_READ);
if (fde->flags & EVENT_FD_WRITE)
oop->cancel_fd(oop, fde->fd, OOP_WRITE);
return 0;
}
/*
add a fd based event
return NULL on failure (memory allocation error)
*/
static struct fd_event *oop_event_add_fd(struct event_context *ev, TALLOC_CTX *mem_ctx,
int fd, uint16_t flags,
event_fd_handler_t handler,
void *private_data)
{
struct fd_event *fde;
oop_source_sys *oop_sys = ev->additional_data;
oop_source *oop = oop_sys_source(oop_sys);
fde = talloc(mem_ctx?mem_ctx:ev, struct fd_event);
if (!fde) return NULL;
fde->event_ctx = ev;
fde->fd = fd;
fde->flags = flags;
fde->handler = handler;
fde->private_data = private_data;
fde->additional_flags = 0;
fde->additional_data = NULL;
if (fde->flags & EVENT_FD_READ)
oop->on_fd(oop, fde->fd, OOP_READ, oop_event_fd_handler, fde);
if (fde->flags & EVENT_FD_WRITE)
oop->on_fd(oop, fde->fd, OOP_WRITE, oop_event_fd_handler, fde);
talloc_set_destructor(fde, oop_event_fd_destructor);
return fde;
}
/*
return the fd event flags
*/
static uint16_t oop_event_get_fd_flags(struct fd_event *fde)
{
return fde->flags;
}
/*
set the fd event flags
*/
static void oop_event_set_fd_flags(struct fd_event *fde, uint16_t flags)
{
oop_source_sys *oop_sys;
oop_source *oop;
oop_sys = fde->event_ctx->additional_data;
oop = oop_sys_source(oop_sys);
if ((fde->flags & EVENT_FD_READ)&&(!(flags & EVENT_FD_READ)))
oop->cancel_fd(oop, fde->fd, OOP_READ);
if ((!(fde->flags & EVENT_FD_READ))&&(flags & EVENT_FD_READ))
oop->on_fd(oop, fde->fd, OOP_READ, oop_event_fd_handler, fde);
if ((fde->flags & EVENT_FD_WRITE)&&(!(flags & EVENT_FD_WRITE)))
oop->cancel_fd(oop, fde->fd, OOP_WRITE);
if ((!(fde->flags & EVENT_FD_WRITE))&&(flags & EVENT_FD_WRITE))
oop->on_fd(oop, fde->fd, OOP_WRITE, oop_event_fd_handler, fde);
fde->flags = flags;
}
static int oop_event_timed_destructor(void *ptr);
static int oop_event_timed_deny_destructor(void *ptr)
{
return -1;
}
static void *oop_event_timed_handler(oop_source *oop, struct timeval t, void *ptr)
{
struct timed_event *te = ptr;
/* deny the handler to free the event */
talloc_set_destructor(te, oop_event_timed_deny_destructor);
te->handler(te->event_ctx, te, t, te->private_data);
talloc_set_destructor(te, oop_event_timed_destructor);
talloc_free(te);
return OOP_CONTINUE;
}
/*
destroy a timed event
*/
static int oop_event_timed_destructor(void *ptr)
{
struct timed_event *te = talloc_get_type(ptr, struct timed_event);
struct event_context *ev = te->event_ctx;
oop_source_sys *oop_sys = ev->additional_data;
oop_source *oop = oop_sys_source(oop_sys);
oop->cancel_time(oop, te->next_event, oop_event_timed_handler, te);
return 0;
}
/*
add a timed event
return NULL on failure (memory allocation error)
*/
static struct timed_event *oop_event_add_timed(struct event_context *ev, TALLOC_CTX *mem_ctx,
struct timeval next_event,
event_timed_handler_t handler,
void *private_data)
{
oop_source_sys *oop_sys = ev->additional_data;
oop_source *oop = oop_sys_source(oop_sys);
struct timed_event *te;
te = talloc(mem_ctx?mem_ctx:ev, struct timed_event);
if (te == NULL) return NULL;
te->event_ctx = ev;
te->next_event = next_event;
te->handler = handler;
te->private_data = private_data;
te->additional_data = NULL;
oop->on_time(oop, te->next_event, oop_event_timed_handler, te);
talloc_set_destructor(te, oop_event_timed_destructor);
return te;
}
/*
do a single event loop using the events defined in ev
*/
static int oop_event_loop_once(struct event_context *ev)
{
void *oop_ret;
oop_source_sys *oop_sys = ev->additional_data;
oop_ret = oop_sys_run_once(oop_sys);
if (oop_ret == OOP_CONTINUE) {
return 0;
}
return -1;
}
/*
return on failure or (with 0) if all fd events are removed
*/
static int oop_event_loop_wait(struct event_context *ev)
{
void *oop_ret;
oop_source_sys *oop_sys = ev->additional_data;
oop_ret = oop_sys_run(oop_sys);
if (oop_ret == OOP_CONTINUE) {
return 0;
}
return -1;
}
static const struct event_ops event_oop_ops = {
.context_init = oop_event_context_init,
.add_fd = oop_event_add_fd,
.get_fd_flags = oop_event_get_fd_flags,
.set_fd_flags = oop_event_set_fd_flags,
.add_timed = oop_event_add_timed,
.loop_once = oop_event_loop_once,
.loop_wait = oop_event_loop_wait,
};
const struct event_ops *event_liboop_get_ops(void)
{
return &event_oop_ops;
}
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