Unix SMB/CIFS implementation.
main select loop and event handling
Copyright (C) Andrew Tridgell 2003-2005
- 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 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, see <http://www.gnu.org/licenses/>.
-*/
+ Copyright (C) Stefan Metzmacher 2005-2009
-/*
- This is SAMBA's default event loop code
+ ** NOTE! The following LGPL license applies to the tevent
+ ** library. This does NOT imply that all of Samba is released
+ ** under the LGPL
+
+ This library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 3 of the License, or (at your option) any later version.
+ This library 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
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with this library; if not, see <http://www.gnu.org/licenses/>.
*/
#include "replace.h"
#include "system/filesys.h"
#include "system/select.h"
-#include "events.h"
-#include "events_util.h"
-#include "events_internal.h"
+#include "tevent.h"
+#include "tevent_util.h"
+#include "tevent_internal.h"
struct select_event_context {
/* a pointer back to the generic event_context */
- struct event_context *ev;
-
- /* list of filedescriptor events */
- struct fd_event *fd_events;
-
- /* list of timed events */
- struct timed_event *timed_events;
+ struct tevent_context *ev;
/* the maximum file descriptor number in fd_events */
int maxfd;
-
- /* information for exiting from the event loop */
- int exit_code;
-
- /* this is incremented when the loop over events causes something which
- could change the events yet to be processed */
- uint32_t destruction_count;
};
/*
create a select_event_context structure.
*/
-static int select_event_context_init(struct event_context *ev)
+static int select_event_context_init(struct tevent_context *ev)
{
struct select_event_context *select_ev;
+ /*
+ * We might be called during tevent_re_initialise()
+ * which means we need to free our old additional_data.
+ */
+ TALLOC_FREE(ev->additional_data);
+
select_ev = talloc_zero(ev, struct select_event_context);
if (!select_ev) return -1;
select_ev->ev = ev;
*/
static void calc_maxfd(struct select_event_context *select_ev)
{
- struct fd_event *fde;
+ struct tevent_fd *fde;
select_ev->maxfd = 0;
- for (fde = select_ev->fd_events; fde; fde = fde->next) {
+ for (fde = select_ev->ev->fd_events; fde; fde = fde->next) {
if (fde->fd > select_ev->maxfd) {
select_ev->maxfd = fde->fd;
}
/*
destroy an fd_event
*/
-static int select_event_fd_destructor(struct fd_event *fde)
+static int select_event_fd_destructor(struct tevent_fd *fde)
{
- struct event_context *ev = fde->event_ctx;
- struct select_event_context *select_ev = talloc_get_type(ev->additional_data,
- struct select_event_context);
-
- if (select_ev->maxfd == fde->fd) {
- select_ev->maxfd = EVENT_INVALID_MAXFD;
- }
+ struct tevent_context *ev = fde->event_ctx;
+ struct select_event_context *select_ev = NULL;
- DLIST_REMOVE(select_ev->fd_events, fde);
- select_ev->destruction_count++;
+ if (ev) {
+ select_ev = talloc_get_type_abort(ev->additional_data,
+ struct select_event_context);
- if (fde->flags & EVENT_FD_AUTOCLOSE) {
- close(fde->fd);
- fde->fd = -1;
+ if (select_ev->maxfd == fde->fd) {
+ select_ev->maxfd = EVENT_INVALID_MAXFD;
+ }
}
- return 0;
+ return tevent_common_fd_destructor(fde);
}
/*
add a fd based event
return NULL on failure (memory allocation error)
*/
-static struct fd_event *select_event_add_fd(struct event_context *ev, TALLOC_CTX *mem_ctx,
- int fd, uint16_t flags,
- event_fd_handler_t handler,
- void *private_data)
+static struct tevent_fd *select_event_add_fd(struct tevent_context *ev, TALLOC_CTX *mem_ctx,
+ int fd, uint16_t flags,
+ tevent_fd_handler_t handler,
+ void *private_data,
+ const char *handler_name,
+ const char *location)
{
- struct select_event_context *select_ev = talloc_get_type(ev->additional_data,
- struct select_event_context);
- struct fd_event *fde;
+ struct select_event_context *select_ev =
+ talloc_get_type_abort(ev->additional_data,
+ struct select_event_context);
+ struct tevent_fd *fde;
+
+ if (fd < 0 || fd >= FD_SETSIZE) {
+ errno = EBADF;
+ return NULL;
+ }
- fde = talloc(mem_ctx?mem_ctx:ev, struct fd_event);
+ fde = tevent_common_add_fd(ev, mem_ctx, fd, flags,
+ handler, private_data,
+ handler_name, location);
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;
-
- DLIST_ADD(select_ev->fd_events, fde);
- if (fde->fd > select_ev->maxfd) {
+ if ((select_ev->maxfd != EVENT_INVALID_MAXFD)
+ && (fde->fd > select_ev->maxfd)) {
select_ev->maxfd = fde->fd;
}
talloc_set_destructor(fde, select_event_fd_destructor);
return fde;
}
-
-/*
- return the fd event flags
-*/
-static uint16_t select_event_get_fd_flags(struct fd_event *fde)
-{
- return fde->flags;
-}
-
-/*
- set the fd event flags
-*/
-static void select_event_set_fd_flags(struct fd_event *fde, uint16_t flags)
-{
- struct event_context *ev;
- struct select_event_context *select_ev;
-
- if (fde->flags == flags) return;
-
- ev = fde->event_ctx;
- select_ev = talloc_get_type(ev->additional_data, struct select_event_context);
-
- fde->flags = flags;
-}
-
/*
event loop handling using select()
*/
static int select_event_loop_select(struct select_event_context *select_ev, struct timeval *tvalp)
{
fd_set r_fds, w_fds;
- struct fd_event *fde;
+ struct tevent_fd *fde;
int selrtn;
- uint32_t destruction_count = ++select_ev->destruction_count;
+ int select_errno;
/* we maybe need to recalculate the maxfd */
if (select_ev->maxfd == EVENT_INVALID_MAXFD) {
FD_ZERO(&w_fds);
/* setup any fd events */
- for (fde = select_ev->fd_events; fde; fde = fde->next) {
- if (fde->flags & EVENT_FD_READ) {
+ for (fde = select_ev->ev->fd_events; fde; fde = fde->next) {
+ if (fde->fd < 0 || fde->fd >= FD_SETSIZE) {
+ tevent_debug(select_ev->ev, TEVENT_DEBUG_FATAL,
+ "ERROR: EBADF fd[%d] >= %d "
+ "select_event_loop_once\n",
+ fde->fd, FD_SETSIZE);
+ errno = EBADF;
+ return -1;
+ }
+
+ if (fde->flags & TEVENT_FD_READ) {
FD_SET(fde->fd, &r_fds);
}
- if (fde->flags & EVENT_FD_WRITE) {
+ if (fde->flags & TEVENT_FD_WRITE) {
FD_SET(fde->fd, &w_fds);
}
}
- if (select_ev->ev->num_signal_handlers &&
- common_event_check_signal(select_ev->ev)) {
+ if (select_ev->ev->signal_events &&
+ tevent_common_check_signal(select_ev->ev)) {
return 0;
}
+ tevent_trace_point_callback(select_ev->ev, TEVENT_TRACE_BEFORE_WAIT);
selrtn = select(select_ev->maxfd+1, &r_fds, &w_fds, NULL, tvalp);
+ select_errno = errno;
+ tevent_trace_point_callback(select_ev->ev, TEVENT_TRACE_AFTER_WAIT);
- if (selrtn == -1 && errno == EINTR &&
- select_ev->ev->num_signal_handlers) {
- common_event_check_signal(select_ev->ev);
+ if (selrtn == -1 && select_errno == EINTR &&
+ select_ev->ev->signal_events) {
+ tevent_common_check_signal(select_ev->ev);
return 0;
}
- if (selrtn == -1 && errno == EBADF) {
+ if (selrtn == -1 && select_errno == EBADF) {
/* the socket is dead! this should never
happen as the socket should have first been
made readable and that should have removed
the event, so this must be a bug. This is a
fatal error. */
- ev_debug(select_ev->ev, EV_DEBUG_FATAL,
- "ERROR: EBADF on select_event_loop_once\n");
- select_ev->exit_code = EBADF;
+ tevent_debug(select_ev->ev, TEVENT_DEBUG_FATAL,
+ "ERROR: EBADF on select_event_loop_once\n");
+ errno = select_errno;
return -1;
}
if (selrtn == 0 && tvalp) {
/* we don't care about a possible delay here */
- common_event_loop_timer_delay(select_ev->ev);
+ tevent_common_loop_timer_delay(select_ev->ev);
return 0;
}
/* at least one file descriptor is ready - check
which ones and call the handler, being careful to allow
the handler to remove itself when called */
- for (fde = select_ev->fd_events; fde; fde = fde->next) {
+ for (fde = select_ev->ev->fd_events; fde; fde = fde->next) {
uint16_t flags = 0;
- if (FD_ISSET(fde->fd, &r_fds)) flags |= EVENT_FD_READ;
- if (FD_ISSET(fde->fd, &w_fds)) flags |= EVENT_FD_WRITE;
+ if (FD_ISSET(fde->fd, &r_fds) && (fde->flags & TEVENT_FD_READ)) {
+ flags |= TEVENT_FD_READ;
+ }
+ if (FD_ISSET(fde->fd, &w_fds) && (fde->flags & TEVENT_FD_WRITE)) {
+ flags |= TEVENT_FD_WRITE;
+ }
if (flags) {
+ DLIST_DEMOTE(select_ev->ev->fd_events, fde);
fde->handler(select_ev->ev, fde, flags, fde->private_data);
- if (destruction_count != select_ev->destruction_count) {
- break;
- }
+ break;
}
}
}
return 0;
-}
+}
/*
do a single event loop using the events defined in ev
*/
-static int select_event_loop_once(struct event_context *ev)
+static int select_event_loop_once(struct tevent_context *ev, const char *location)
{
- struct select_event_context *select_ev = talloc_get_type(ev->additional_data,
- struct select_event_context);
+ struct select_event_context *select_ev =
+ talloc_get_type_abort(ev->additional_data,
+ struct select_event_context);
struct timeval tval;
- tval = common_event_loop_timer_delay(ev);
- if (ev_timeval_is_zero(&tval)) {
+ if (ev->signal_events &&
+ tevent_common_check_signal(ev)) {
return 0;
}
- return select_event_loop_select(select_ev, &tval);
-}
+ if (ev->threaded_contexts != NULL) {
+ tevent_common_threaded_activate_immediate(ev);
+ }
-/*
- return on failure or (with 0) if all fd events are removed
-*/
-static int select_event_loop_wait(struct event_context *ev)
-{
- struct select_event_context *select_ev = talloc_get_type(ev->additional_data,
- struct select_event_context);
- select_ev->exit_code = 0;
+ if (ev->immediate_events &&
+ tevent_common_loop_immediate(ev)) {
+ return 0;
+ }
- while (select_ev->fd_events && select_ev->exit_code == 0) {
- if (select_event_loop_once(ev) != 0) {
- break;
- }
+ tval = tevent_common_loop_timer_delay(ev);
+ if (tevent_timeval_is_zero(&tval)) {
+ return 0;
}
- return select_ev->exit_code;
+ return select_event_loop_select(select_ev, &tval);
}
-static const struct event_ops select_event_ops = {
- .context_init = select_event_context_init,
- .add_fd = select_event_add_fd,
- .get_fd_flags = select_event_get_fd_flags,
- .set_fd_flags = select_event_set_fd_flags,
- .add_timed = common_event_add_timed,
- .add_signal = common_event_add_signal,
- .loop_once = select_event_loop_once,
- .loop_wait = select_event_loop_wait,
+static const struct tevent_ops select_event_ops = {
+ .context_init = select_event_context_init,
+ .add_fd = select_event_add_fd,
+ .set_fd_close_fn = tevent_common_fd_set_close_fn,
+ .get_fd_flags = tevent_common_fd_get_flags,
+ .set_fd_flags = tevent_common_fd_set_flags,
+ .add_timer = tevent_common_add_timer_v2,
+ .schedule_immediate = tevent_common_schedule_immediate,
+ .add_signal = tevent_common_add_signal,
+ .loop_once = select_event_loop_once,
+ .loop_wait = tevent_common_loop_wait,
};
-bool events_select_init(void)
+_PRIVATE_ bool tevent_select_init(void)
{
- return event_register_backend("select", &select_event_ops);
+ return tevent_register_backend("select", &select_event_ops);
}
-
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