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/*
Unix SMB/CIFS implementation.
Timed event library.
Copyright (C) Andrew Tridgell 1992-1998
Copyright (C) Volker Lendecke 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 3 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"
struct timed_event {
struct timed_event *next, *prev;
struct event_context *event_ctx;
struct timeval when;
const char *event_name;
void (*handler)(struct event_context *event_ctx,
struct timed_event *te,
const struct timeval *now,
void *private_data);
void *private_data;
};
struct fd_event {
struct fd_event *prev, *next;
struct event_context *event_ctx;
int fd;
uint16_t flags; /* see EVENT_FD_* flags */
void (*handler)(struct event_context *event_ctx,
struct fd_event *event,
uint16 flags,
void *private_data);
void *private_data;
};
#define EVENT_FD_WRITEABLE(fde) \
event_set_fd_flags(fde, event_get_fd_flags(fde) | EVENT_FD_WRITE)
#define EVENT_FD_READABLE(fde) \
event_set_fd_flags(fde, event_get_fd_flags(fde) | EVENT_FD_READ)
#define EVENT_FD_NOT_WRITEABLE(fde) \
event_set_fd_flags(fde, event_get_fd_flags(fde) & ~EVENT_FD_WRITE)
#define EVENT_FD_NOT_READABLE(fde) \
event_set_fd_flags(fde, event_get_fd_flags(fde) & ~EVENT_FD_READ)
struct event_context {
struct timed_event *timed_events;
struct fd_event *fd_events;
};
static int timed_event_destructor(struct timed_event *te)
{
DEBUG(10, ("Destroying timed event %lx \"%s\"\n", (unsigned long)te,
te->event_name));
DLIST_REMOVE(te->event_ctx->timed_events, te);
return 0;
}
/****************************************************************************
Add te by time.
****************************************************************************/
static void add_event_by_time(struct timed_event *te)
{
struct event_context *ctx = te->event_ctx;
struct timed_event *last_te, *cur_te;
/* Keep the list ordered by time. We must preserve this. */
last_te = NULL;
for (cur_te = ctx->timed_events; cur_te; cur_te = cur_te->next) {
/* if the new event comes before the current one break */
if (!timeval_is_zero(&cur_te->when) &&
timeval_compare(&te->when, &cur_te->when) < 0) {
break;
}
last_te = cur_te;
}
DLIST_ADD_AFTER(ctx->timed_events, te, last_te);
}
/****************************************************************************
Schedule a function for future calling, cancel with TALLOC_FREE().
It's the responsibility of the handler to call TALLOC_FREE() on the event
handed to it.
****************************************************************************/
struct timed_event *event_add_timed(struct event_context *event_ctx,
TALLOC_CTX *mem_ctx,
struct timeval when,
const char *event_name,
void (*handler)(struct event_context *event_ctx,
struct timed_event *te,
const struct timeval *now,
void *private_data),
void *private_data)
{
struct timed_event *te;
te = TALLOC_P(mem_ctx, struct timed_event);
if (te == NULL) {
DEBUG(0, ("talloc failed\n"));
return NULL;
}
te->event_ctx = event_ctx;
te->when = when;
te->event_name = event_name;
te->handler = handler;
te->private_data = private_data;
add_event_by_time(te);
talloc_set_destructor(te, timed_event_destructor);
DEBUG(10, ("Added timed event \"%s\": %lx\n", event_name,
(unsigned long)te));
return te;
}
static int fd_event_destructor(struct fd_event *fde)
{
struct event_context *event_ctx = fde->event_ctx;
DLIST_REMOVE(event_ctx->fd_events, fde);
return 0;
}
struct fd_event *event_add_fd(struct event_context *event_ctx,
TALLOC_CTX *mem_ctx,
int fd, uint16_t flags,
void (*handler)(struct event_context *event_ctx,
struct fd_event *event,
uint16 flags,
void *private_data),
void *private_data)
{
struct fd_event *fde;
if (!(fde = TALLOC_P(mem_ctx, struct fd_event))) {
return NULL;
}
fde->event_ctx = event_ctx;
fde->fd = fd;
fde->flags = flags;
fde->handler = handler;
fde->private_data = private_data;
DLIST_ADD(event_ctx->fd_events, fde);
talloc_set_destructor(fde, fd_event_destructor);
return fde;
}
void event_fd_set_writeable(struct fd_event *fde)
{
fde->flags |= EVENT_FD_WRITE;
}
void event_fd_set_not_writeable(struct fd_event *fde)
{
fde->flags &= ~EVENT_FD_WRITE;
}
void event_fd_set_readable(struct fd_event *fde)
{
fde->flags |= EVENT_FD_READ;
}
void event_fd_set_not_readable(struct fd_event *fde)
{
fde->flags &= ~EVENT_FD_READ;
}
/*
* Return if there's something in the queue
*/
BOOL event_add_to_select_args(struct event_context *event_ctx,
const struct timeval *now,
fd_set *read_fds, fd_set *write_fds,
struct timeval *timeout, int *maxfd)
{
struct fd_event *fde;
struct timeval diff;
BOOL ret = False;
for (fde = event_ctx->fd_events; fde; fde = fde->next) {
if (fde->flags & EVENT_FD_READ) {
FD_SET(fde->fd, read_fds);
ret = True;
}
if (fde->flags & EVENT_FD_WRITE) {
FD_SET(fde->fd, write_fds);
ret = True;
}
if ((fde->flags & (EVENT_FD_READ|EVENT_FD_WRITE))
&& (fde->fd > *maxfd)) {
*maxfd = fde->fd;
}
}
if (event_ctx->timed_events == NULL) {
return ret;
}
diff = timeval_until(now, &event_ctx->timed_events->when);
*timeout = timeval_min(timeout, &diff);
return True;
}
BOOL events_pending(struct event_context *event_ctx)
{
struct fd_event *fde;
if (event_ctx->timed_events != NULL) {
return True;
}
for (fde = event_ctx->fd_events; fde; fde = fde->next) {
if (fde->flags & (EVENT_FD_READ|EVENT_FD_WRITE)) {
return True;
}
}
return False;
}
BOOL run_events(struct event_context *event_ctx,
int selrtn, fd_set *read_fds, fd_set *write_fds)
{
BOOL fired = False;
struct fd_event *fde, *next;
/* Run all events that are pending, not just one (as we
did previously. */
while (event_ctx->timed_events) {
struct timeval now;
GetTimeOfDay(&now);
if (timeval_compare(
&now, &event_ctx->timed_events->when) < 0) {
/* Nothing to do yet */
DEBUG(11, ("run_events: Nothing to do\n"));
break;
}
DEBUG(10, ("Running event \"%s\" %lx\n",
event_ctx->timed_events->event_name,
(unsigned long)event_ctx->timed_events));
event_ctx->timed_events->handler(
event_ctx,
event_ctx->timed_events, &now,
event_ctx->timed_events->private_data);
fired = True;
}
if (fired) {
/*
* We might have changed the socket status during the timed
* events, return to run select again.
*/
return True;
}
if (selrtn == 0) {
/*
* No fd ready
*/
return fired;
}
for (fde = event_ctx->fd_events; fde; fde = next) {
uint16 flags = 0;
next = fde->next;
if (FD_ISSET(fde->fd, read_fds)) flags |= EVENT_FD_READ;
if (FD_ISSET(fde->fd, write_fds)) flags |= EVENT_FD_WRITE;
if (flags) {
fde->handler(event_ctx, fde, flags, fde->private_data);
fired = True;
}
}
return fired;
}
struct timeval *get_timed_events_timeout(struct event_context *event_ctx,
struct timeval *to_ret)
{
struct timeval now;
if (event_ctx->timed_events == NULL) {
return NULL;
}
now = timeval_current();
*to_ret = timeval_until(&now, &event_ctx->timed_events->when);
DEBUG(10, ("timed_events_timeout: %d/%d\n", (int)to_ret->tv_sec,
(int)to_ret->tv_usec));
return to_ret;
}
int event_loop_once(struct event_context *ev)
{
struct timeval now, to;
fd_set r_fds, w_fds;
int maxfd = 0;
int ret;
FD_ZERO(&r_fds);
FD_ZERO(&w_fds);
to.tv_sec = 9999; /* Max timeout */
to.tv_usec = 0;
GetTimeOfDay(&now);
if (!event_add_to_select_args(ev, &now, &r_fds, &w_fds, &to, &maxfd)) {
return -1;
}
if (timeval_is_zero(&to)) {
run_events(ev, 0, NULL, NULL);
return 0;
}
ret = sys_select(maxfd, &r_fds, &w_fds, NULL, &to);
if (ret == -1 && errno != EINTR) {
return -1;
}
run_events(ev, ret, &r_fds, &w_fds);
return 0;
}
struct event_context *event_context_init(TALLOC_CTX *mem_ctx)
{
return TALLOC_ZERO_P(NULL, struct event_context);
}
int set_event_dispatch_time(struct event_context *event_ctx,
const char *event_name, struct timeval when)
{
struct timed_event *te;
for (te = event_ctx->timed_events; te; te = te->next) {
if (strcmp(event_name, te->event_name) == 0) {
DLIST_REMOVE(event_ctx->timed_events, te);
te->when = when;
add_event_by_time(te);
return 1;
}
}
return 0;
}
/* Returns 1 if event was found and cancelled, 0 otherwise. */
int cancel_named_event(struct event_context *event_ctx,
const char *event_name)
{
struct timed_event *te;
for (te = event_ctx->timed_events; te; te = te->next) {
if (strcmp(event_name, te->event_name) == 0) {
TALLOC_FREE(te);
return 1;
}
}
return 0;
}
void dump_event_list(struct event_context *event_ctx)
{
struct timed_event *te;
struct fd_event *fe;
struct timeval evt, now;
if (!event_ctx) {
return;
}
now = timeval_current();
DEBUG(10,("dump_event_list:\n"));
for (te = event_ctx->timed_events; te; te = te->next) {
evt = timeval_until(&now, &te->when);
DEBUGADD(10,("Timed Event \"%s\" %lx handled in %d seconds\n",
te->event_name,
(unsigned long)te,
(int)evt.tv_sec));
}
for (fe = event_ctx->fd_events; fe; fe = fe->next) {
DEBUGADD(10,("FD Event %d %lx, flags: 0x%04x\n",
fe->fd,
(unsigned long)fe,
fe->flags));
}
}
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