#include "tevent_internal.h"
struct poll_event_context {
+ /* a pointer back to the generic event_context */
+ struct tevent_context *ev;
+
+ /*
+ * A DLIST for fresh fde's added by poll_event_add_fd but not
+ * picked up yet by poll_event_loop_once
+ */
+ struct tevent_fd *fresh;
+ /*
+ * A DLIST for disabled fde's.
+ */
+ struct tevent_fd *disabled;
+ /*
+ * one or more events were deleted or disabled
+ */
+ bool deleted;
+
/*
* These two arrays are maintained together.
*/
struct pollfd *fds;
- struct tevent_fd **fd_events;
- int num_fds;
+ struct tevent_fd **fdes;
+ unsigned num_fds;
- /* information for exiting from the event loop */
- int exit_code;
+ /*
+ * Signal fd to wake the poll() thread
+ */
+ int signal_fd;
};
+static int poll_event_context_destructor(struct poll_event_context *poll_ev)
+{
+ struct tevent_fd *fd, *fn;
+
+ for (fd = poll_ev->fresh; fd; fd = fn) {
+ fn = fd->next;
+ fd->event_ctx = NULL;
+ DLIST_REMOVE(poll_ev->fresh, fd);
+ }
+
+ for (fd = poll_ev->disabled; fd; fd = fn) {
+ fn = fd->next;
+ fd->event_ctx = NULL;
+ DLIST_REMOVE(poll_ev->disabled, fd);
+ }
+
+ if (poll_ev->signal_fd == -1) {
+ /*
+ * Non-threaded, no signal pipe
+ */
+ return 0;
+ }
+
+ close(poll_ev->signal_fd);
+ poll_ev->signal_fd = -1;
+
+ if (poll_ev->num_fds == 0) {
+ return 0;
+ }
+ if (poll_ev->fds[0].fd != -1) {
+ close(poll_ev->fds[0].fd);
+ poll_ev->fds[0].fd = -1;
+ }
+ return 0;
+}
+
/*
- create a select_event_context structure.
+ create a poll_event_context structure.
*/
static int poll_event_context_init(struct tevent_context *ev)
{
struct poll_event_context *poll_ev;
+ /*
+ * we might be called during tevent_re_initialise()
+ * which means we need to free our old additional_data
+ * in order to detach old fd events from the
+ * poll_ev->fresh list
+ */
+ TALLOC_FREE(ev->additional_data);
+
poll_ev = talloc_zero(ev, struct poll_event_context);
if (poll_ev == NULL) {
return -1;
}
+ poll_ev->ev = ev;
+ poll_ev->signal_fd = -1;
ev->additional_data = poll_ev;
+ talloc_set_destructor(poll_ev, poll_event_context_destructor);
+ return 0;
+}
+
+static bool set_nonblock(int fd)
+{
+ int val;
+
+ val = fcntl(fd, F_GETFL, 0);
+ if (val == -1) {
+ return false;
+ }
+ val |= O_NONBLOCK;
+
+ return (fcntl(fd, F_SETFL, val) != -1);
+}
+
+static int poll_event_context_init_mt(struct tevent_context *ev)
+{
+ struct poll_event_context *poll_ev;
+ struct pollfd *pfd;
+ int fds[2];
+ int ret;
+
+ ret = poll_event_context_init(ev);
+ if (ret == -1) {
+ return ret;
+ }
+
+ poll_ev = talloc_get_type_abort(
+ ev->additional_data, struct poll_event_context);
+
+ poll_ev->fds = talloc_zero(poll_ev, struct pollfd);
+ if (poll_ev->fds == NULL) {
+ return -1;
+ }
+
+ ret = pipe(fds);
+ if (ret == -1) {
+ return -1;
+ }
+
+ if (!set_nonblock(fds[0]) || !set_nonblock(fds[1])) {
+ close(fds[0]);
+ close(fds[1]);
+ return -1;
+ }
+
+ poll_ev->signal_fd = fds[1];
+
+ pfd = &poll_ev->fds[0];
+ pfd->fd = fds[0];
+ pfd->events = (POLLIN|POLLHUP);
+
+ poll_ev->num_fds = 1;
+
+ talloc_set_destructor(poll_ev, poll_event_context_destructor);
+
return 0;
}
+static void poll_event_wake_pollthread(struct poll_event_context *poll_ev)
+{
+ char c;
+ ssize_t ret;
+
+ if (poll_ev->signal_fd == -1) {
+ return;
+ }
+ c = 0;
+ do {
+ ret = write(poll_ev->signal_fd, &c, sizeof(c));
+ } while ((ret == -1) && (errno == EINTR));
+}
+
+static void poll_event_drain_signal_fd(struct poll_event_context *poll_ev)
+{
+ char buf[16];
+ ssize_t ret;
+ int fd;
+
+ if (poll_ev->signal_fd == -1) {
+ return;
+ }
+
+ if (poll_ev->num_fds < 1) {
+ return;
+ }
+ fd = poll_ev->fds[0].fd;
+
+ do {
+ ret = read(fd, buf, sizeof(buf));
+ } while (ret == sizeof(buf));
+}
+
/*
destroy an fd_event
*/
static int poll_event_fd_destructor(struct tevent_fd *fde)
{
struct tevent_context *ev = fde->event_ctx;
- struct poll_event_context *poll_ev = NULL;
- struct tevent_fd *moved_fde;
- long del_idx;
+ struct poll_event_context *poll_ev;
+ uint64_t del_idx = fde->additional_flags;
if (ev == NULL) {
goto done;
poll_ev = talloc_get_type_abort(
ev->additional_data, struct poll_event_context);
- /*
- * Assume a void * can carry enough bits to hold num_fds.
- */
- del_idx = (long)(fde->additional_data);
+ if (del_idx == UINT64_MAX) {
+ struct tevent_fd **listp =
+ (struct tevent_fd **)fde->additional_data;
- moved_fde = poll_ev->fd_events[poll_ev->num_fds-1];
- poll_ev->fd_events[del_idx] = moved_fde;
- poll_ev->fds[del_idx] = poll_ev->fds[poll_ev->num_fds-1];
- moved_fde->additional_data = (void *)del_idx;
+ DLIST_REMOVE((*listp), fde);
+ goto done;
+ }
- poll_ev->num_fds -= 1;
+ poll_ev->fdes[del_idx] = NULL;
+ poll_ev->deleted = true;
+ poll_event_wake_pollthread(poll_ev);
done:
return tevent_common_fd_destructor(fde);
}
+static void poll_event_schedule_immediate(struct tevent_immediate *im,
+ struct tevent_context *ev,
+ tevent_immediate_handler_t handler,
+ void *private_data,
+ const char *handler_name,
+ const char *location)
+{
+ struct poll_event_context *poll_ev = talloc_get_type_abort(
+ ev->additional_data, struct poll_event_context);
+
+ tevent_common_schedule_immediate(im, ev, handler, private_data,
+ handler_name, location);
+ poll_event_wake_pollthread(poll_ev);
+}
+
+/*
+ Private function called by "standard" backend fallback.
+ Note this only allows fallback to "poll" backend, not "poll-mt".
+*/
+_PRIVATE_ void tevent_poll_event_add_fd_internal(struct tevent_context *ev,
+ struct tevent_fd *fde)
+{
+ struct poll_event_context *poll_ev = talloc_get_type_abort(
+ ev->additional_data, struct poll_event_context);
+ struct tevent_fd **listp;
+
+ if (fde->flags != 0) {
+ listp = &poll_ev->fresh;
+ } else {
+ listp = &poll_ev->disabled;
+ }
+
+ fde->additional_flags = UINT64_MAX;
+ fde->additional_data = listp;
+
+ DLIST_ADD((*listp), fde);
+ talloc_set_destructor(fde, poll_event_fd_destructor);
+}
+
/*
add a fd based event
return NULL on failure (memory allocation error)
{
struct poll_event_context *poll_ev = talloc_get_type_abort(
ev->additional_data, struct poll_event_context);
- struct pollfd *pfd;
struct tevent_fd *fde;
- fde = tevent_common_add_fd(ev, mem_ctx, fd, flags,
- handler, private_data,
- handler_name, location);
- if (fde == NULL) {
+ if (fd < 0) {
return NULL;
}
- /* we allocate 16 slots to avoid a lot of reallocations */
- if (talloc_array_length(poll_ev->fds) == poll_ev->num_fds) {
- struct pollfd *tmp_fds;
- struct tevent_fd **tmp_fd_events;
- tmp_fds = talloc_realloc(
- poll_ev, poll_ev->fds, struct pollfd,
- poll_ev->num_fds + 16);
- if (tmp_fds == NULL) {
- TALLOC_FREE(fde);
- return NULL;
- }
- poll_ev->fds = tmp_fds;
-
- tmp_fd_events = talloc_realloc(
- poll_ev, poll_ev->fd_events, struct tevent_fd *,
- poll_ev->num_fds + 16);
- if (tmp_fd_events == NULL) {
- TALLOC_FREE(fde);
- return NULL;
- }
- poll_ev->fd_events = tmp_fd_events;
- }
-
- pfd = &poll_ev->fds[poll_ev->num_fds];
-
- pfd->fd = fd;
-
- pfd->events = 0;
- pfd->revents = 0;
-
- if (flags & TEVENT_FD_READ) {
- pfd->events |= (POLLIN|POLLHUP);
- }
- if (flags & TEVENT_FD_WRITE) {
- pfd->events |= (POLLOUT);
+ fde = talloc(mem_ctx ? mem_ctx : ev, struct tevent_fd);
+ if (fde == NULL) {
+ return NULL;
}
+ fde->event_ctx = ev;
+ fde->fd = fd;
+ fde->flags = flags;
+ fde->handler = handler;
+ fde->close_fn = NULL;
+ fde->private_data = private_data;
+ fde->handler_name = handler_name;
+ fde->location = location;
+ fde->additional_flags = UINT64_MAX;
+ fde->additional_data = NULL;
+
+ tevent_poll_event_add_fd_internal(ev, fde);
+ poll_event_wake_pollthread(poll_ev);
/*
- * Assume a void * can carry enough bits to hold num_fds.
+ * poll_event_loop_poll will take care of the rest in
+ * poll_event_setup_fresh
*/
- fde->additional_data = (void *)(long)poll_ev->num_fds;
- poll_ev->fd_events[poll_ev->num_fds] = fde;
-
- poll_ev->num_fds += 1;
-
- talloc_set_destructor(fde, poll_event_fd_destructor);
-
return fde;
}
*/
static void poll_event_set_fd_flags(struct tevent_fd *fde, uint16_t flags)
{
- struct poll_event_context *poll_ev = talloc_get_type_abort(
- fde->event_ctx->additional_data, struct poll_event_context);
- long idx;
- uint16_t pollflags = 0;
+ struct tevent_context *ev = fde->event_ctx;
+ struct poll_event_context *poll_ev;
+ uint64_t idx = fde->additional_flags;
+ uint16_t pollflags;
+
+ if (ev == NULL) {
+ return;
+ }
+ poll_ev = talloc_get_type_abort(
+ ev->additional_data, struct poll_event_context);
+
+ fde->flags = flags;
+
+ if (idx == UINT64_MAX) {
+ struct tevent_fd **listp =
+ (struct tevent_fd **)fde->additional_data;
+
+ /*
+ * We move it between the fresh and disabled lists.
+ */
+ DLIST_REMOVE((*listp), fde);
+ tevent_poll_event_add_fd_internal(ev, fde);
+ poll_event_wake_pollthread(poll_ev);
+ return;
+ }
+
+ if (fde->flags == 0) {
+ /*
+ * We need to remove it from the array
+ * and move it to the disabled list.
+ */
+ poll_ev->fdes[idx] = NULL;
+ poll_ev->deleted = true;
+ DLIST_REMOVE(ev->fd_events, fde);
+ tevent_poll_event_add_fd_internal(ev, fde);
+ poll_event_wake_pollthread(poll_ev);
+ return;
+ }
+
+ pollflags = 0;
if (flags & TEVENT_FD_READ) {
pollflags |= (POLLIN|POLLHUP);
if (flags & TEVENT_FD_WRITE) {
pollflags |= (POLLOUT);
}
-
- idx = (long)(fde->additional_data);
poll_ev->fds[idx].events = pollflags;
- fde->flags = flags;
+ poll_event_wake_pollthread(poll_ev);
+}
+
+static bool poll_event_setup_fresh(struct tevent_context *ev,
+ struct poll_event_context *poll_ev)
+{
+ struct tevent_fd *fde, *next;
+ unsigned num_fresh, num_fds;
+
+ if (poll_ev->deleted) {
+ unsigned first_fd = (poll_ev->signal_fd != -1) ? 1 : 0;
+ unsigned i;
+
+ for (i=first_fd; i < poll_ev->num_fds;) {
+ fde = poll_ev->fdes[i];
+ if (fde != NULL) {
+ i++;
+ continue;
+ }
+
+ /*
+ * This fde was talloc_free()'ed. Delete it
+ * from the arrays
+ */
+ poll_ev->num_fds -= 1;
+ if (poll_ev->num_fds == i) {
+ break;
+ }
+ poll_ev->fds[i] = poll_ev->fds[poll_ev->num_fds];
+ poll_ev->fdes[i] = poll_ev->fdes[poll_ev->num_fds];
+ if (poll_ev->fdes[i] != NULL) {
+ poll_ev->fdes[i]->additional_flags = i;
+ }
+ }
+ poll_ev->deleted = false;
+ }
+
+ if (poll_ev->fresh == NULL) {
+ return true;
+ }
+
+ num_fresh = 0;
+ for (fde = poll_ev->fresh; fde; fde = fde->next) {
+ num_fresh += 1;
+ }
+ num_fds = poll_ev->num_fds + num_fresh;
+
+ /*
+ * We check the length of fdes here. It is the last one
+ * enlarged, so if the realloc for poll_fd->fdes fails,
+ * poll_fd->fds will have at least the size of poll_fd->fdes
+ */
+
+ if (num_fds >= talloc_array_length(poll_ev->fdes)) {
+ struct pollfd *tmp_fds;
+ struct tevent_fd **tmp_fdes;
+ unsigned array_length;
+
+ array_length = (num_fds + 15) & ~15; /* round up to 16 */
+
+ tmp_fds = talloc_realloc(
+ poll_ev, poll_ev->fds, struct pollfd, array_length);
+ if (tmp_fds == NULL) {
+ return false;
+ }
+ poll_ev->fds = tmp_fds;
+
+ tmp_fdes = talloc_realloc(
+ poll_ev, poll_ev->fdes, struct tevent_fd *,
+ array_length);
+ if (tmp_fdes == NULL) {
+ return false;
+ }
+ poll_ev->fdes = tmp_fdes;
+ }
+
+ for (fde = poll_ev->fresh; fde; fde = next) {
+ struct pollfd *pfd;
+
+ pfd = &poll_ev->fds[poll_ev->num_fds];
+
+ pfd->fd = fde->fd;
+ pfd->events = 0;
+ pfd->revents = 0;
+
+ if (fde->flags & TEVENT_FD_READ) {
+ pfd->events |= (POLLIN|POLLHUP);
+ }
+ if (fde->flags & TEVENT_FD_WRITE) {
+ pfd->events |= (POLLOUT);
+ }
+
+ fde->additional_flags = poll_ev->num_fds;
+ poll_ev->fdes[poll_ev->num_fds] = fde;
+
+ next = fde->next;
+ DLIST_REMOVE(poll_ev->fresh, fde);
+ DLIST_ADD(ev->fd_events, fde);
+
+ poll_ev->num_fds += 1;
+ }
+ return true;
}
/*
- event loop handling using select()
+ event loop handling using poll()
*/
static int poll_event_loop_poll(struct tevent_context *ev,
struct timeval *tvalp)
{
struct poll_event_context *poll_ev = talloc_get_type_abort(
ev->additional_data, struct poll_event_context);
- struct tevent_fd *fde;
int pollrtn;
int timeout = -1;
+ int poll_errno;
+ struct tevent_fd *fde = NULL;
+ struct tevent_fd *next = NULL;
+ unsigned i;
if (ev->signal_events && tevent_common_check_signal(ev)) {
return 0;
timeout += (tvalp->tv_usec + 999) / 1000;
}
+ poll_event_drain_signal_fd(poll_ev);
+
+ if (!poll_event_setup_fresh(ev, poll_ev)) {
+ return -1;
+ }
+
+ tevent_trace_point_callback(poll_ev->ev, TEVENT_TRACE_BEFORE_WAIT);
pollrtn = poll(poll_ev->fds, poll_ev->num_fds, timeout);
+ poll_errno = errno;
+ tevent_trace_point_callback(poll_ev->ev, TEVENT_TRACE_AFTER_WAIT);
- if (pollrtn == -1 && errno == EINTR && ev->signal_events) {
+ if (pollrtn == -1 && poll_errno == EINTR && ev->signal_events) {
tevent_common_check_signal(ev);
return 0;
}
- if (pollrtn == -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. */
- tevent_debug(ev, TEVENT_DEBUG_FATAL,
- "ERROR: EBADF on poll_event_loop_once\n");
- poll_ev->exit_code = EBADF;
- return -1;
- }
-
if (pollrtn == 0 && tvalp) {
/* we don't care about a possible delay here */
tevent_common_loop_timer_delay(ev);
return 0;
}
- if (pollrtn > 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 = ev->fd_events; fde; fde = fde->next) {
- struct pollfd *pfd;
- long pfd_idx;
- uint16_t flags = 0;
+ if (pollrtn <= 0) {
+ /*
+ * No fd's ready
+ */
+ return 0;
+ }
- pfd_idx = (long)(fde->additional_data);
+ /* 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 */
- pfd = &poll_ev->fds[pfd_idx];
+ for (fde = ev->fd_events; fde; fde = next) {
+ uint64_t idx = fde->additional_flags;
+ struct pollfd *pfd;
+ uint16_t flags = 0;
- if (pfd->revents & (POLLIN|POLLHUP|POLLERR)) {
- flags |= TEVENT_FD_READ;
- }
- if (pfd->revents & POLLOUT) {
- flags |= TEVENT_FD_WRITE;
+ next = fde->next;
+
+ if (idx == UINT64_MAX) {
+ continue;
+ }
+
+ pfd = &poll_ev->fds[idx];
+
+ if (pfd->revents & POLLNVAL) {
+ /*
+ * 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.
+ *
+ * We ignore it here to match the epoll
+ * behavior.
+ */
+ tevent_debug(ev, TEVENT_DEBUG_ERROR,
+ "POLLNVAL on fde[%p] fd[%d] - disabling\n",
+ fde, pfd->fd);
+ poll_ev->fdes[idx] = NULL;
+ poll_ev->deleted = true;
+ DLIST_REMOVE(ev->fd_events, fde);
+ fde->event_ctx = NULL;
+ continue;
+ }
+
+ if (pfd->revents & (POLLHUP|POLLERR)) {
+ /* If we only wait for TEVENT_FD_WRITE, we
+ should not tell the event handler about it,
+ and remove the writable flag, as we only
+ report errors when waiting for read events
+ to match the select behavior. */
+ if (!(fde->flags & TEVENT_FD_READ)) {
+ TEVENT_FD_NOT_WRITEABLE(fde);
+ continue;
}
- if (flags != 0) {
- fde->handler(ev, fde, flags,
- fde->private_data);
- break;
+ flags |= TEVENT_FD_READ;
+ }
+ if (pfd->revents & POLLIN) {
+ flags |= TEVENT_FD_READ;
+ }
+ if (pfd->revents & POLLOUT) {
+ flags |= TEVENT_FD_WRITE;
+ }
+ /*
+ * Note that fde->flags could be changed when using
+ * the poll_mt backend together with threads,
+ * that why we need to check pfd->revents and fde->flags
+ */
+ flags &= fde->flags;
+ if (flags != 0) {
+ DLIST_DEMOTE(ev->fd_events, fde);
+ fde->handler(ev, fde, flags, fde->private_data);
+ return 0;
+ }
+ }
+
+ for (i = 0; i < poll_ev->num_fds; i++) {
+ if (poll_ev->fds[i].revents & POLLNVAL) {
+ /*
+ * 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 or
+ * a race in the poll_mt usage.
+ */
+ fde = poll_ev->fdes[i];
+ tevent_debug(ev, TEVENT_DEBUG_WARNING,
+ "POLLNVAL on dangling fd[%d] fde[%p] - disabling\n",
+ poll_ev->fds[i].fd, fde);
+ poll_ev->fdes[i] = NULL;
+ poll_ev->deleted = true;
+ if (fde != NULL) {
+ DLIST_REMOVE(ev->fd_events, fde);
+ fde->event_ctx = NULL;
}
}
}
return 0;
}
+ if (ev->threaded_contexts != NULL) {
+ tevent_common_threaded_activate_immediate(ev);
+ }
+
if (ev->immediate_events &&
tevent_common_loop_immediate(ev)) {
return 0;
return poll_event_loop_poll(ev, &tval);
}
+static int poll_event_loop_wait(struct tevent_context *ev,
+ const char *location)
+{
+ struct poll_event_context *poll_ev = talloc_get_type_abort(
+ ev->additional_data, struct poll_event_context);
+
+ /*
+ * loop as long as we have events pending
+ */
+ while (tevent_common_have_events(ev) ||
+ poll_ev->fresh ||
+ poll_ev->disabled) {
+ int ret;
+ ret = _tevent_loop_once(ev, location);
+ if (ret != 0) {
+ tevent_debug(ev, TEVENT_DEBUG_FATAL,
+ "_tevent_loop_once() failed: %d - %s\n",
+ ret, strerror(errno));
+ return ret;
+ }
+ }
+
+ tevent_debug(ev, TEVENT_DEBUG_WARNING,
+ "poll_event_loop_wait() out of events\n");
+ return 0;
+}
+
static const struct tevent_ops poll_event_ops = {
.context_init = poll_event_context_init,
.add_fd = poll_event_add_fd,
.set_fd_close_fn = tevent_common_fd_set_close_fn,
.get_fd_flags = tevent_common_fd_get_flags,
.set_fd_flags = poll_event_set_fd_flags,
- .add_timer = tevent_common_add_timer,
+ .add_timer = tevent_common_add_timer_v2,
.schedule_immediate = tevent_common_schedule_immediate,
.add_signal = tevent_common_add_signal,
.loop_once = poll_event_loop_once,
- .loop_wait = tevent_common_loop_wait,
+ .loop_wait = poll_event_loop_wait,
};
_PRIVATE_ bool tevent_poll_init(void)
{
return tevent_register_backend("poll", &poll_event_ops);
}
+
+static const struct tevent_ops poll_event_mt_ops = {
+ .context_init = poll_event_context_init_mt,
+ .add_fd = poll_event_add_fd,
+ .set_fd_close_fn = tevent_common_fd_set_close_fn,
+ .get_fd_flags = tevent_common_fd_get_flags,
+ .set_fd_flags = poll_event_set_fd_flags,
+ .add_timer = tevent_common_add_timer_v2,
+ .schedule_immediate = poll_event_schedule_immediate,
+ .add_signal = tevent_common_add_signal,
+ .loop_once = poll_event_loop_once,
+ .loop_wait = poll_event_loop_wait,
+};
+
+_PRIVATE_ bool tevent_poll_mt_init(void)
+{
+ return tevent_register_backend("poll_mt", &poll_event_mt_ops);
+}
git.samba.org / sfrench / samba-autobuild / .git / blobdiff