2 Unix SMB/CIFS implementation.
4 Copyright (C) Andrew Tridgell 1992-1998
5 Copyright (C) Volker Lendecke 2005
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program. If not, see <http://www.gnu.org/licenses/>.
22 #include <tevent_internal.h>
23 #include "../lib/util/select.h"
26 * Return if there's something in the queue
29 bool event_add_to_select_args(struct tevent_context *ev,
30 fd_set *read_fds, fd_set *write_fds,
31 struct timeval *timeout, int *maxfd)
34 struct tevent_fd *fde;
38 for (fde = ev->fd_events; fde; fde = fde->next) {
39 if (fde->flags & EVENT_FD_READ) {
40 FD_SET(fde->fd, read_fds);
43 if (fde->flags & EVENT_FD_WRITE) {
44 FD_SET(fde->fd, write_fds);
48 if ((fde->flags & (EVENT_FD_READ|EVENT_FD_WRITE))
49 && (fde->fd > *maxfd)) {
54 if (ev->immediate_events != NULL) {
55 *timeout = timeval_zero();
59 if (ev->timer_events == NULL) {
63 now = timeval_current();
64 diff = timeval_until(&now, &ev->timer_events->next_event);
65 *timeout = timeval_min(timeout, &diff);
70 bool run_events(struct tevent_context *ev,
71 int selrtn, fd_set *read_fds, fd_set *write_fds)
73 struct tevent_fd *fde;
76 if (ev->signal_events &&
77 tevent_common_check_signal(ev)) {
81 if (ev->immediate_events &&
82 tevent_common_loop_immediate(ev)) {
88 if ((ev->timer_events != NULL)
89 && (timeval_compare(&now, &ev->timer_events->next_event) >= 0)) {
90 /* this older events system did not auto-free timed
91 events on running them, and had a race condition
92 where the event could be called twice if the
93 talloc_free of the te happened after the callback
94 made a call which invoked the event loop. To avoid
95 this while still allowing old code which frees the
96 te, we need to create a temporary context which
97 will be used to ensure the te is freed. We also
98 remove the te from the timed event list before we
99 call the handler, to ensure we can't loop */
101 struct tevent_timer *te = ev->timer_events;
102 TALLOC_CTX *tmp_ctx = talloc_new(ev);
104 DEBUG(10, ("Running timed event \"%s\" %p\n",
105 ev->timer_events->handler_name, ev->timer_events));
107 DLIST_REMOVE(ev->timer_events, te);
108 talloc_steal(tmp_ctx, te);
110 te->handler(ev, te, now, te->private_data);
112 talloc_free(tmp_ctx);
123 for (fde = ev->fd_events; fde; fde = fde->next) {
126 if (FD_ISSET(fde->fd, read_fds)) flags |= EVENT_FD_READ;
127 if (FD_ISSET(fde->fd, write_fds)) flags |= EVENT_FD_WRITE;
129 if (flags & fde->flags) {
130 DLIST_DEMOTE(ev->fd_events, fde, struct tevent_fd);
131 fde->handler(ev, fde, flags, fde->private_data);
140 struct timeval *get_timed_events_timeout(struct tevent_context *ev,
141 struct timeval *to_ret)
145 if ((ev->timer_events == NULL) && (ev->immediate_events == NULL)) {
148 if (ev->immediate_events != NULL) {
149 *to_ret = timeval_zero();
153 now = timeval_current();
154 *to_ret = timeval_until(&now, &ev->timer_events->next_event);
156 DEBUG(10, ("timed_events_timeout: %d/%d\n", (int)to_ret->tv_sec,
157 (int)to_ret->tv_usec));
162 static int s3_event_loop_once(struct tevent_context *ev, const char *location)
172 to.tv_sec = 9999; /* Max timeout */
175 if (run_events(ev, 0, NULL, NULL)) {
179 if (!event_add_to_select_args(ev, &r_fds, &w_fds, &to, &maxfd)) {
183 ret = sys_select(maxfd+1, &r_fds, &w_fds, NULL, &to);
185 if (ret == -1 && errno != EINTR) {
186 tevent_debug(ev, TEVENT_DEBUG_FATAL,
187 "sys_select() failed: %d:%s\n",
188 errno, strerror(errno));
192 run_events(ev, ret, &r_fds, &w_fds);
196 static int s3_event_context_init(struct tevent_context *ev)
201 void dump_event_list(struct tevent_context *ev)
203 struct tevent_timer *te;
204 struct tevent_fd *fe;
205 struct timeval evt, now;
211 now = timeval_current();
213 DEBUG(10,("dump_event_list:\n"));
215 for (te = ev->timer_events; te; te = te->next) {
217 evt = timeval_until(&now, &te->next_event);
219 DEBUGADD(10,("Timed Event \"%s\" %p handled in %d seconds (at %s)\n",
223 http_timestring(talloc_tos(), te->next_event.tv_sec)));
226 for (fe = ev->fd_events; fe; fe = fe->next) {
228 DEBUGADD(10,("FD Event %d %p, flags: 0x%04x\n",
235 static const struct tevent_ops s3_event_ops = {
236 .context_init = s3_event_context_init,
237 .add_fd = tevent_common_add_fd,
238 .set_fd_close_fn = tevent_common_fd_set_close_fn,
239 .get_fd_flags = tevent_common_fd_get_flags,
240 .set_fd_flags = tevent_common_fd_set_flags,
241 .add_timer = tevent_common_add_timer,
242 .schedule_immediate = tevent_common_schedule_immediate,
243 .add_signal = tevent_common_add_signal,
244 .loop_once = s3_event_loop_once,
245 .loop_wait = tevent_common_loop_wait,
248 static bool s3_tevent_init(void)
250 static bool initialized;
254 initialized = tevent_register_backend("s3", &s3_event_ops);
255 tevent_set_default_backend("s3");
260 this is used to catch debug messages from events
262 static void s3_event_debug(void *context, enum tevent_debug_level level,
263 const char *fmt, va_list ap) PRINTF_ATTRIBUTE(3,0);
265 static void s3_event_debug(void *context, enum tevent_debug_level level,
266 const char *fmt, va_list ap)
268 int samba_level = -1;
271 case TEVENT_DEBUG_FATAL:
274 case TEVENT_DEBUG_ERROR:
277 case TEVENT_DEBUG_WARNING:
280 case TEVENT_DEBUG_TRACE:
285 if (vasprintf(&s, fmt, ap) == -1) {
288 DEBUG(samba_level, ("s3_event: %s", s));
292 struct tevent_context *s3_tevent_context_init(TALLOC_CTX *mem_ctx)
294 struct tevent_context *ev;
298 ev = tevent_context_init_byname(mem_ctx, "s3");
300 tevent_set_debug(ev, s3_event_debug, NULL);