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
+ 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,
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.
+ along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/*
at runtime we fallback to select()
*/
-#include "includes.h"
+#include "replace.h"
#include "system/filesys.h"
-#include "system/select.h" /* needed for WITH_EPOLL */
-#include "dlinklist.h"
-#include "lib/events/events.h"
-#include "lib/events/events_internal.h"
+#include "system/network.h"
+#include "system/select.h" /* needed for HAVE_EVENTS_EPOLL */
+#include "events.h"
+#include "events_util.h"
+#include "events_internal.h"
struct std_event_context {
/* a pointer back to the generic event_context */
/* list of filedescriptor events */
struct fd_event *fd_events;
- /* list of timed events */
- struct timed_event *timed_events;
-
/* the maximum file descriptor number in fd_events */
int maxfd;
/* when using epoll this is the handle from epoll_create */
int epoll_fd;
-};
-static void std_event_loop_timer(struct std_event_context *std_ev);
+ /* our pid at the time the epoll_fd was created */
+ pid_t pid;
+};
/* use epoll if it is available */
-#if WITH_EPOLL
+#if HAVE_EVENTS_EPOLL
/*
called when a epoll call fails, and we should fallback
to using select
*/
static void epoll_fallback_to_select(struct std_event_context *std_ev, const char *reason)
{
- DEBUG(0,("%s (%s) - falling back to select()\n", reason, strerror(errno)));
+ ev_debug(std_ev->ev, EV_DEBUG_FATAL,
+ "%s (%s) - falling back to select()\n",
+ reason, strerror(errno));
close(std_ev->epoll_fd);
std_ev->epoll_fd = -1;
talloc_set_destructor(std_ev, NULL);
*/
static int epoll_ctx_destructor(struct std_event_context *std_ev)
{
- close(std_ev->epoll_fd);
+ if (std_ev->epoll_fd != -1) {
+ close(std_ev->epoll_fd);
+ }
std_ev->epoll_fd = -1;
return 0;
}
/*
init the epoll fd
*/
-static void epoll_init_ctx(struct std_event_context *std_ev, BOOL try_epoll)
+static void epoll_init_ctx(struct std_event_context *std_ev)
{
- if (!try_epoll) return;
std_ev->epoll_fd = epoll_create(64);
+ std_ev->pid = getpid();
talloc_set_destructor(std_ev, epoll_ctx_destructor);
}
+static void epoll_add_event(struct std_event_context *std_ev, struct fd_event *fde);
+
+/*
+ reopen the epoll handle when our pid changes
+ see http://junkcode.samba.org/ftp/unpacked/junkcode/epoll_fork.c for an
+ demonstration of why this is needed
+ */
+static void epoll_check_reopen(struct std_event_context *std_ev)
+{
+ struct fd_event *fde;
+
+ if (std_ev->pid == getpid()) {
+ return;
+ }
+
+ close(std_ev->epoll_fd);
+ std_ev->epoll_fd = epoll_create(64);
+ if (std_ev->epoll_fd == -1) {
+ ev_debug(std_ev->ev, EV_DEBUG_FATAL,
+ "Failed to recreate epoll handle after fork\n");
+ return;
+ }
+ std_ev->pid = getpid();
+ for (fde=std_ev->fd_events;fde;fde=fde->next) {
+ epoll_add_event(std_ev, fde);
+ }
+}
+
#define EPOLL_ADDITIONAL_FD_FLAG_HAS_EVENT (1<<0)
#define EPOLL_ADDITIONAL_FD_FLAG_REPORT_ERROR (1<<1)
#define EPOLL_ADDITIONAL_FD_FLAG_GOT_ERROR (1<<2)
static void epoll_change_event(struct std_event_context *std_ev, struct fd_event *fde)
{
- BOOL got_error = (fde->additional_flags & EPOLL_ADDITIONAL_FD_FLAG_GOT_ERROR);
- BOOL want_read = (fde->flags & EVENT_FD_READ);
- BOOL want_write= (fde->flags & EVENT_FD_WRITE);
+ bool got_error = (fde->additional_flags & EPOLL_ADDITIONAL_FD_FLAG_GOT_ERROR);
+ bool want_read = (fde->flags & EVENT_FD_READ);
+ bool want_write= (fde->flags & EVENT_FD_WRITE);
if (std_ev->epoll_fd == -1) return;
int ret, i;
#define MAXEVENTS 8
struct epoll_event events[MAXEVENTS];
- uint32_t destruction_count = std_ev->destruction_count;
+ uint32_t destruction_count = ++std_ev->destruction_count;
int timeout = -1;
if (std_ev->epoll_fd == -1) return -1;
timeout = ((tvalp->tv_usec+999) / 1000) + (tvalp->tv_sec*1000);
}
+ if (std_ev->ev->num_signal_handlers &&
+ common_event_check_signal(std_ev->ev)) {
+ return 0;
+ }
+
ret = epoll_wait(std_ev->epoll_fd, events, MAXEVENTS, timeout);
+ if (ret == -1 && errno == EINTR && std_ev->ev->num_signal_handlers) {
+ if (common_event_check_signal(std_ev->ev)) {
+ return 0;
+ }
+ }
+
if (ret == -1 && errno != EINTR) {
epoll_fallback_to_select(std_ev, "epoll_wait() failed");
return -1;
}
if (ret == 0 && tvalp) {
- std_event_loop_timer(std_ev);
+ /* we don't care about a possible delay here */
+ common_event_loop_timer_delay(std_ev->ev);
return 0;
}
return 0;
}
#else
-#define epoll_init_ctx(std_ev,try_epoll) if (try_epoll) {/* fix unused variable warning*/}
+#define epoll_init_ctx(std_ev)
#define epoll_add_event(std_ev,fde)
#define epoll_del_event(std_ev,fde)
#define epoll_change_event(std_ev,fde)
#define epoll_event_loop(std_ev,tvalp) (-1)
+#define epoll_check_reopen(std_ev)
#endif
/*
create a std_event_context structure.
*/
-static int std_event_context_init(struct event_context *ev, void *private_data)
+static int std_event_context_init(struct event_context *ev)
{
struct std_event_context *std_ev;
- BOOL *_try_epoll = private_data;
- BOOL try_epoll = (_try_epoll == NULL ? True : *_try_epoll);
std_ev = talloc_zero(ev, struct std_event_context);
if (!std_ev) return -1;
std_ev->ev = ev;
std_ev->epoll_fd = -1;
- epoll_init_ctx(std_ev, try_epoll);
+ epoll_init_ctx(std_ev);
ev->additional_data = std_ev;
return 0;
struct std_event_context *std_ev = talloc_get_type(ev->additional_data,
struct std_event_context);
+ epoll_check_reopen(std_ev);
+
if (std_ev->maxfd == fde->fd) {
std_ev->maxfd = EVENT_INVALID_MAXFD;
}
epoll_del_event(std_ev, fde);
+ if (fde->flags & EVENT_FD_AUTOCLOSE) {
+ close(fde->fd);
+ fde->fd = -1;
+ }
+
return 0;
}
struct std_event_context);
struct fd_event *fde;
+ epoll_check_reopen(std_ev);
+
fde = talloc(mem_ctx?mem_ctx:ev, struct fd_event);
if (!fde) return NULL;
fde->additional_data = NULL;
DLIST_ADD(std_ev->fd_events, fde);
- if (fde->fd > std_ev->maxfd) {
+ if ((std_ev->maxfd != EVENT_INVALID_MAXFD)
+ && (fde->fd > std_ev->maxfd)) {
std_ev->maxfd = fde->fd;
}
talloc_set_destructor(fde, std_event_fd_destructor);
fde->flags = flags;
- epoll_change_event(std_ev, fde);
-}
-
-/*
- destroy a timed event
-*/
-static int std_event_timed_destructor(struct timed_event *te)
-{
- struct std_event_context *std_ev = talloc_get_type(te->event_ctx->additional_data,
- struct std_event_context);
- DLIST_REMOVE(std_ev->timed_events, te);
- return 0;
-}
-
-static int std_event_timed_deny_destructor(struct timed_event *te)
-{
- return -1;
-}
-
-/*
- add a timed event
- return NULL on failure (memory allocation error)
-*/
-static struct timed_event *std_event_add_timed(struct event_context *ev, TALLOC_CTX *mem_ctx,
- struct timeval next_event,
- event_timed_handler_t handler,
- void *private_data)
-{
- struct std_event_context *std_ev = talloc_get_type(ev->additional_data,
- struct std_event_context);
- struct timed_event *te, *last_te, *cur_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;
-
- /* keep the list ordered */
- last_te = NULL;
- for (cur_te = std_ev->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->next_event) &&
- timeval_compare(&te->next_event,
- &cur_te->next_event) < 0) {
- break;
- }
-
- last_te = cur_te;
- }
-
- DLIST_ADD_AFTER(std_ev->timed_events, te, last_te);
-
- talloc_set_destructor(te, std_event_timed_destructor);
-
- return te;
-}
-
-/*
- a timer has gone off - call it
-*/
-static void std_event_loop_timer(struct std_event_context *std_ev)
-{
- struct timeval t = timeval_current();
- struct timed_event *te = std_ev->timed_events;
-
- if (te == NULL) {
- return;
- }
-
- /* deny the handler to free the event */
- talloc_set_destructor(te, std_event_timed_deny_destructor);
-
- /* We need to remove the timer from the list before calling the
- * handler because in a semi-async inner event loop called from the
- * handler we don't want to come across this event again -- vl */
- DLIST_REMOVE(std_ev->timed_events, te);
+ epoll_check_reopen(std_ev);
- te->handler(std_ev->ev, te, t, te->private_data);
-
- /* The destructor isn't necessary anymore, we've already removed the
- * event from the list. */
- talloc_set_destructor(te, NULL);
-
- talloc_free(te);
+ epoll_change_event(std_ev, fde);
}
/*
fd_set r_fds, w_fds;
struct fd_event *fde;
int selrtn;
- uint32_t destruction_count = std_ev->destruction_count;
+ uint32_t destruction_count = ++std_ev->destruction_count;
/* we maybe need to recalculate the maxfd */
if (std_ev->maxfd == EVENT_INVALID_MAXFD) {
}
}
+ if (std_ev->ev->num_signal_handlers &&
+ common_event_check_signal(std_ev->ev)) {
+ return 0;
+ }
+
selrtn = select(std_ev->maxfd+1, &r_fds, &w_fds, NULL, tvalp);
+ if (selrtn == -1 && errno == EINTR &&
+ std_ev->ev->num_signal_handlers) {
+ common_event_check_signal(std_ev->ev);
+ return 0;
+ }
+
if (selrtn == -1 && 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. */
- DEBUG(0,("ERROR: EBADF on std_event_loop_once\n"));
+ ev_debug(std_ev->ev, EV_DEBUG_FATAL,
+ "ERROR: EBADF on std_event_loop_once\n");
std_ev->exit_code = EBADF;
return -1;
}
if (selrtn == 0 && tvalp) {
- std_event_loop_timer(std_ev);
+ /* we don't care about a possible delay here */
+ common_event_loop_timer_delay(std_ev->ev);
return 0;
}
struct std_event_context);
struct timeval tval;
- /* work out the right timeout for all timed events */
- if (std_ev->timed_events) {
- struct timeval t = timeval_current();
- tval = timeval_until(&t, &std_ev->timed_events->next_event);
- if (timeval_is_zero(&tval)) {
- std_event_loop_timer(std_ev);
- return 0;
- }
- } else {
- /* have a default tick time of 30 seconds. This guarantees
- that code that uses its own timeout checking will be
- able to proceeed eventually */
- tval = timeval_set(30, 0);
+ tval = common_event_loop_timer_delay(ev);
+ if (ev_timeval_is_zero(&tval)) {
+ return 0;
}
+ epoll_check_reopen(std_ev);
+
if (epoll_event_loop(std_ev, &tval) == 0) {
return 0;
}
.add_fd = std_event_add_fd,
.get_fd_flags = std_event_get_fd_flags,
.set_fd_flags = std_event_set_fd_flags,
- .add_timed = std_event_add_timed,
+ .add_timed = common_event_add_timed,
+ .add_signal = common_event_add_signal,
.loop_once = std_event_loop_once,
.loop_wait = std_event_loop_wait,
};
-const struct event_ops *event_standard_get_ops(void)
+
+bool events_standard_init(void)
{
- return &std_event_ops;
+ return event_register_backend("standard", &std_event_ops);
}
+
git.samba.org / tprouty / samba.git / blobdiff