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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-05-05 17:47:29 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-05-05 17:47:29 +0000
commit4f5791ebd03eaec1c7da0865a383175b05102712 (patch)
tree8ce7b00f7a76baa386372422adebbe64510812d4 /lib/tevent/tevent_port.c
parentInitial commit. (diff)
downloadsamba-4f5791ebd03eaec1c7da0865a383175b05102712.tar.xz
samba-4f5791ebd03eaec1c7da0865a383175b05102712.zip
Adding upstream version 2:4.17.12+dfsg.upstream/2%4.17.12+dfsgupstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'lib/tevent/tevent_port.c')
-rw-r--r--lib/tevent/tevent_port.c804
1 files changed, 804 insertions, 0 deletions
diff --git a/lib/tevent/tevent_port.c b/lib/tevent/tevent_port.c
new file mode 100644
index 0000000..ccb65a7
--- /dev/null
+++ b/lib/tevent/tevent_port.c
@@ -0,0 +1,804 @@
+/*
+ Unix SMB/CIFS implementation.
+
+ Main select loop and event handling - Solaris port implementation.
+ Losely based on the Linux epoll backend.
+
+ Copyright (C) Jeremy Allison 2013
+
+ ** 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 "tevent.h"
+#include "tevent_internal.h"
+#include "tevent_util.h"
+
+struct port_associate_vals {
+ struct port_associate_vals *prev, *next;
+ struct port_event_context *port_ev;
+ int events;
+ struct tevent_fd *fde;
+ bool associated_event;
+};
+
+struct port_event_context {
+ /* a pointer back to the generic event_context */
+ struct tevent_context *ev;
+
+ /* This is the handle from port_create */
+ int port_fd;
+
+ pid_t pid;
+
+ /* List of associations. */
+ struct port_associate_vals *po_vals;
+};
+
+#define PORT_ADDITIONAL_FD_FLAG_HAS_ASSOCIATION (1<<0)
+#define PORT_ADDITIONAL_FD_FLAG_REPORT_ERROR (1<<1)
+#define PORT_ADDITIONAL_FD_FLAG_GOT_ERROR (1<<2)
+#define PORT_ADDITIONAL_FD_FLAG_HAS_MPX (1<<3)
+
+/*
+ Map from TEVENT_FD_* to POLLIN/POLLOUT
+*/
+static int port_map_flags(uint16_t flags)
+{
+ int ret = 0;
+ if (flags & TEVENT_FD_READ) ret |= (POLLIN | POLLERR | POLLHUP);
+ if (flags & TEVENT_FD_WRITE) ret |= (POLLOUT | POLLERR | POLLHUP);
+ return ret;
+}
+
+/*
+ Free the port fd
+*/
+static int port_ctx_destructor(struct port_event_context *port_ev)
+{
+ close(port_ev->port_fd);
+ port_ev->port_fd = -1;
+ return 0;
+}
+
+/*
+ Init the port fd
+*/
+static int port_init_ctx(struct port_event_context *port_ev)
+{
+ port_ev->port_fd = port_create();
+ if (port_ev->port_fd == -1) {
+ tevent_debug(port_ev->ev, TEVENT_DEBUG_FATAL,
+ "Failed to create port handle.\n");
+ return -1;
+ }
+
+ if (!ev_set_close_on_exec(port_ev->port_fd)) {
+ tevent_debug(port_ev->ev, TEVENT_DEBUG_WARNING,
+ "Failed to set close-on-exec, file descriptor may be leaked to children.\n");
+ }
+
+ port_ev->pid = tevent_cached_getpid();
+ talloc_set_destructor(port_ev, port_ctx_destructor);
+
+ return 0;
+}
+
+/*
+ Functions to manage the lower level cache of associated events on the port_fd.
+*/
+
+static int port_associate_vals_destructor(struct port_associate_vals *val)
+{
+ DLIST_REMOVE(val->port_ev->po_vals, val);
+ memset(val, '\0', sizeof(struct port_associate_vals));
+ return 0;
+}
+
+/*
+ * TODO: As the port_association is per-fde, it should be possible to store it
+ * directly in fde->additional_data, alongside any multiplexed-fde. That way the
+ * lookup on store and delete would be avoided, and associate_all_events() could
+ * walk the ev->fd_events list.
+ */
+static bool store_port_association(struct port_event_context *port_ev,
+ struct tevent_fd *fde,
+ int events)
+{
+ struct port_associate_vals *val;
+
+ for (val = port_ev->po_vals; val; val = val->next) {
+ if (val->fde->fd == fde->fd) {
+ /* Association already attached to fd. */
+ if (val->events != events) {
+ val->events = events;
+ val->associated_event = false;
+ }
+ return true;
+ }
+ }
+
+ val = talloc_zero(port_ev, struct port_associate_vals);
+ if (val == NULL) {
+ return false;
+ }
+
+ val->port_ev = port_ev;
+ val->fde = fde;
+ val->events = events;
+ val->associated_event = false;
+
+ DLIST_ADD(port_ev->po_vals, val);
+ talloc_set_destructor(val, port_associate_vals_destructor);
+
+ return true;
+}
+
+static void delete_port_association(struct port_event_context *port_ev,
+ struct tevent_fd *fde)
+{
+ struct port_associate_vals *val;
+
+ for (val = port_ev->po_vals; val; val = val->next) {
+ if (val->fde == fde) {
+ if (val->associated_event) {
+ (void)port_dissociate(port_ev->port_fd,
+ PORT_SOURCE_FD,
+ fde->fd);
+ }
+ talloc_free(val);
+ return;
+ }
+ }
+}
+
+static int associate_all_events(struct port_event_context *port_ev)
+{
+ struct port_associate_vals *val;
+
+ for (val = port_ev->po_vals; val; val = val->next) {
+ int ret;
+ if (val->associated_event) {
+ continue;
+ }
+ ret = port_associate(port_ev->port_fd,
+ PORT_SOURCE_FD,
+ (uintptr_t)val->fde->fd,
+ val->events,
+ (void *)val);
+ if (ret != 0) {
+ return -1;
+ }
+ val->associated_event = true;
+ }
+ return 0;
+}
+
+static int port_update_event(struct port_event_context *port_ev, struct tevent_fd *fde);
+
+/*
+ Reopen the port handle when our pid changes.
+ */
+static int port_check_reopen(struct port_event_context *port_ev)
+{
+ struct tevent_fd *fde;
+ pid_t pid = tevent_cached_getpid();
+
+ if (port_ev->pid == pid) {
+ return 0;
+ }
+
+ close(port_ev->port_fd);
+ port_ev->port_fd = port_create();
+ if (port_ev->port_fd == -1) {
+ tevent_debug(port_ev->ev, TEVENT_DEBUG_FATAL,
+ "port_create() failed");
+ return -1;
+ }
+
+ if (!ev_set_close_on_exec(port_ev->port_fd)) {
+ tevent_debug(port_ev->ev, TEVENT_DEBUG_WARNING,
+ "Failed to set close-on-exec, file descriptor may be leaked to children.\n");
+ }
+
+ port_ev->pid = pid;
+ for (fde=port_ev->ev->fd_events;fde;fde=fde->next) {
+ fde->additional_flags &= PORT_ADDITIONAL_FD_FLAG_HAS_ASSOCIATION;
+ if (port_update_event(port_ev, fde) != 0) {
+ return -1;
+ }
+ }
+ return 0;
+}
+
+/*
+ * Solaris ports cannot add the same file descriptor twice, once
+ * with read, once with write which is allowed by the tevent backend.
+ * Multiplex the existing fde, flag it as such so we can search for the
+ * correct fde on event triggering.
+ */
+
+static void port_setup_multiplex_fd(struct port_event_context *port_ev,
+ struct tevent_fd *add_fde,
+ struct tevent_fd *mpx_fde)
+{
+ /*
+ * Make each fde->additional_data pointers point at each other
+ * so we can look them up from each other. They are now paired.
+ */
+ mpx_fde->additional_data = add_fde;
+ add_fde->additional_data = mpx_fde;
+
+ /* Now flag both fde's as being multiplexed. */
+ mpx_fde->additional_flags |= PORT_ADDITIONAL_FD_FLAG_HAS_MPX;
+ add_fde->additional_flags |= PORT_ADDITIONAL_FD_FLAG_HAS_MPX;
+
+ /* We need to keep the GOT_ERROR flag. */
+ if (mpx_fde->additional_flags & PORT_ADDITIONAL_FD_FLAG_GOT_ERROR) {
+ add_fde->additional_flags |= PORT_ADDITIONAL_FD_FLAG_GOT_ERROR;
+ }
+}
+
+/*
+ Add the port event to the given fd_event,
+ Or modify an existing event.
+*/
+
+static int port_add_event(struct port_event_context *port_ev, struct tevent_fd *fde)
+{
+ int flags = port_map_flags(fde->flags);
+ struct tevent_fd *mpx_fde = NULL;
+
+ fde->additional_flags &= ~PORT_ADDITIONAL_FD_FLAG_HAS_ASSOCIATION;
+ fde->additional_flags &= ~PORT_ADDITIONAL_FD_FLAG_REPORT_ERROR;
+
+ if (fde->additional_flags & PORT_ADDITIONAL_FD_FLAG_HAS_MPX) {
+ /*
+ * This is already a multiplexed fde, we need to include both
+ * flags in the modified event.
+ */
+ mpx_fde = talloc_get_type_abort(fde->additional_data,
+ struct tevent_fd);
+
+ mpx_fde->additional_flags &= ~PORT_ADDITIONAL_FD_FLAG_HAS_ASSOCIATION;
+ mpx_fde->additional_flags &= ~PORT_ADDITIONAL_FD_FLAG_REPORT_ERROR;
+
+ flags |= port_map_flags(mpx_fde->flags);
+ } else {
+ /*
+ * Not (yet) a multiplexed event. See if there
+ * is already an event with the same fd.
+ */
+ for (mpx_fde = port_ev->ev->fd_events; mpx_fde; mpx_fde = mpx_fde->next) {
+ if (mpx_fde->fd != fde->fd) {
+ continue;
+ }
+ if (mpx_fde == fde) {
+ continue;
+ }
+ /* Same fd. */
+ break;
+ }
+ if (mpx_fde) {
+ if (mpx_fde->additional_flags & PORT_ADDITIONAL_FD_FLAG_HAS_MPX) {
+ /* Logic error. Can't have more then 2 multiplexed fde's. */
+ tevent_debug(port_ev->ev, TEVENT_DEBUG_FATAL,
+ "multiplex fde for fd[%d] is already multiplexed\n",
+ mpx_fde->fd);
+ return -1;
+ }
+ flags |= port_map_flags(mpx_fde->flags);
+ }
+ }
+
+ if (!store_port_association(port_ev,
+ fde,
+ flags)) {
+ tevent_debug(port_ev->ev, TEVENT_DEBUG_FATAL,
+ "store_port_association failed for fd[%d]\n",
+ fde->fd);
+ return -1;
+ }
+
+ /* Note we have an association now. */
+ fde->additional_flags |= PORT_ADDITIONAL_FD_FLAG_HAS_ASSOCIATION;
+ /* Only if we want to read do we tell the event handler about errors. */
+ if (fde->flags & TEVENT_FD_READ) {
+ fde->additional_flags |= PORT_ADDITIONAL_FD_FLAG_REPORT_ERROR;
+ }
+ if (mpx_fde == NULL) {
+ return 0;
+ }
+ /* Set up the multiplex pointer. Does no harm if already multiplexed. */
+ port_setup_multiplex_fd(port_ev,
+ fde,
+ mpx_fde);
+
+ mpx_fde->additional_flags |= PORT_ADDITIONAL_FD_FLAG_HAS_ASSOCIATION;
+ /* Only if we want to read do we tell the event handler about errors. */
+ if (mpx_fde->flags & TEVENT_FD_READ) {
+ mpx_fde->additional_flags |= PORT_ADDITIONAL_FD_FLAG_REPORT_ERROR;
+ }
+
+ return 0;
+}
+
+/*
+ Delete the port association for the given fd_event.
+*/
+
+static void port_del_event(struct port_event_context *port_ev, struct tevent_fd *fde)
+{
+ struct tevent_fd *mpx_fde = NULL;
+
+ fde->additional_flags &= ~PORT_ADDITIONAL_FD_FLAG_HAS_ASSOCIATION;
+ fde->additional_flags &= ~PORT_ADDITIONAL_FD_FLAG_REPORT_ERROR;
+
+ if (fde->additional_flags & PORT_ADDITIONAL_FD_FLAG_HAS_MPX) {
+ /*
+ * This is a multiplexed fde, we need to remove
+ * both associations.
+ */
+ mpx_fde = talloc_get_type_abort(fde->additional_data,
+ struct tevent_fd);
+
+ mpx_fde->additional_flags &= ~PORT_ADDITIONAL_FD_FLAG_HAS_ASSOCIATION;
+ mpx_fde->additional_flags &= ~PORT_ADDITIONAL_FD_FLAG_REPORT_ERROR;
+ mpx_fde->additional_data = NULL;
+
+ fde->additional_data = NULL;
+ }
+ delete_port_association(port_ev, fde);
+}
+
+/*
+ Add or remove the port event from the given fd_event
+*/
+static int port_update_event(struct port_event_context *port_ev, struct tevent_fd *fde)
+{
+ bool got_error = (fde->additional_flags & PORT_ADDITIONAL_FD_FLAG_GOT_ERROR);
+ bool want_read = (fde->flags & TEVENT_FD_READ);
+ bool want_write = (fde->flags & TEVENT_FD_WRITE);
+ struct tevent_fd *mpx_fde = NULL;
+
+ if (fde->additional_flags & PORT_ADDITIONAL_FD_FLAG_HAS_MPX) {
+ /*
+ * work out what the multiplexed fde wants.
+ */
+ mpx_fde = talloc_get_type_abort(fde->additional_data,
+ struct tevent_fd);
+ if (mpx_fde->flags & TEVENT_FD_READ) {
+ want_read = true;
+ }
+ if (mpx_fde->flags & TEVENT_FD_WRITE) {
+ want_write = true;
+ }
+ }
+
+ if (fde->additional_flags & PORT_ADDITIONAL_FD_FLAG_HAS_ASSOCIATION) {
+ /* There's already an association. */
+ if (want_read || (want_write && !got_error)) {
+ return port_add_event(port_ev, fde);
+ }
+ /*
+ * If we want to match the select behavior, we need to remove the port event
+ * when the caller isn't interested in events.
+ */
+ port_del_event(port_ev, fde);
+ return 0;
+ }
+
+ /* There's no port event attached to the fde. */
+ if (want_read || (want_write && !got_error)) {
+ return port_add_event(port_ev, fde);
+ }
+ return 0;
+}
+
+/*
+ Cope with port_get returning EPOLLHP|EPOLLERR on an association.
+ Return true if there's nothing else to do, false if this event
+ needs further handling.
+*/
+
+static bool port_handle_hup_or_err(struct port_event_context *port_ev,
+ struct tevent_fd *fde)
+{
+ if (fde == NULL) {
+ return true;
+ }
+
+ fde->additional_flags |= PORT_ADDITIONAL_FD_FLAG_GOT_ERROR;
+ /*
+ * If we only wait for TEVENT_FD_WRITE, we should not tell the
+ * event handler about it, and remove the port association,
+ * as we only report error when waiting for read events,
+ * to match the select() behavior.
+ */
+ if (!(fde->additional_flags & PORT_ADDITIONAL_FD_FLAG_REPORT_ERROR)) {
+ /*
+ * Do the same as the poll backend and
+ * remove the writable flag.
+ */
+ fde->flags &= ~TEVENT_FD_WRITE;
+ return true;
+ }
+ /* This has TEVENT_FD_READ set, we're not finished. */
+ return false;
+}
+
+/*
+ Event loop handling using Solaris ports.
+*/
+static int port_event_loop(struct port_event_context *port_ev, struct timeval *tvalp)
+{
+ int ret;
+#define MAXEVENTS 1
+ port_event_t events[MAXEVENTS];
+ uint_t nget = 1;
+ uint_t max_events = MAXEVENTS;
+ uint_t i;
+ int port_errno;
+ struct timespec ts;
+ struct tevent_context *ev = port_ev->ev;
+
+ if (tvalp) {
+ ts.tv_sec = tvalp->tv_sec;
+ ts.tv_nsec = tvalp->tv_usec * 1000;
+ }
+
+ if (port_ev->ev->signal_events &&
+ tevent_common_check_signal(ev)) {
+ return 0;
+ }
+
+ /*
+ * Solaris triggers sending the event to the port
+ * at the time the port association is done. Postpone
+ * associating fd's until just before we get the events,
+ * otherwise we can deadlock.
+ */
+
+ if (associate_all_events(port_ev) != 0) {
+ return -1;
+ }
+
+ tevent_trace_point_callback(ev, TEVENT_TRACE_BEFORE_WAIT);
+ ret = port_getn(port_ev->port_fd, events, max_events, &nget, &ts);
+ port_errno = errno;
+ tevent_trace_point_callback(ev, TEVENT_TRACE_AFTER_WAIT);
+
+ if (ret == -1 && port_errno == EINTR) {
+ if (ev->signal_events) {
+ tevent_common_check_signal(ev);
+ }
+ /*
+ * If no signal handlers we got an unsolicited
+ * signal wakeup. This can happen with epoll
+ * too. Just return and ignore.
+ */
+ return 0;
+ }
+
+ if (ret == -1 && port_errno == ETIME) {
+ /*
+ * If errno is set to ETIME it is possible that we still got an event.
+ * In that case we need to go through the processing loop so that we
+ * reassociate the received event with the port or the association will
+ * be lost so check the value of nget is 0 before returning.
+ */
+ if (nget == 0) {
+ /* we don't care about a possible delay here */
+ tevent_common_loop_timer_delay(ev);
+ return 0;
+ }
+ /*
+ * Set the return value to 0 since we do not actually have an error and we
+ * do have events that need to be processed. This keeps us from getting
+ * caught in the generic error test.
+ */
+ ret = 0;
+ }
+
+ if (ret == -1) {
+ tevent_debug(ev, TEVENT_DEBUG_ERROR,
+ "port_get failed (%s)\n",
+ strerror(errno));
+ return -1;
+ }
+
+ for (i = 0; i < nget; i++) {
+ struct tevent_fd *mpx_fde = NULL;
+ struct tevent_fd *fde = NULL;
+ uint16_t flags = 0;
+ struct port_associate_vals *val = talloc_get_type(events[i].portev_user,
+ struct port_associate_vals);
+ if (val == NULL) {
+ tevent_debug(ev, TEVENT_DEBUG_ERROR,
+ "port_getn() gave bad data");
+ return -1;
+ }
+
+ /* Mark this event as needing to be re-associated. */
+ val->associated_event = false;
+
+ fde = val->fde;
+
+ if (fde->additional_flags & PORT_ADDITIONAL_FD_FLAG_HAS_MPX) {
+ /*
+ * Save off the multiplexed event in case we need
+ * to use it to call the handler function.
+ */
+ mpx_fde = talloc_get_type_abort(fde->additional_data,
+ struct tevent_fd);
+ }
+
+ if (events[i].portev_events & (POLLHUP|POLLERR)) {
+ bool handled_fde = port_handle_hup_or_err(port_ev, fde);
+ bool handled_mpx = port_handle_hup_or_err(port_ev, mpx_fde);
+
+ if (handled_fde && handled_mpx) {
+ return port_update_event(port_ev, fde);
+ }
+
+ if (!handled_mpx) {
+ /*
+ * If the mpx event was the one that needs
+ * further handling, it's the TEVENT_FD_READ
+ * event so switch over and call that handler.
+ */
+ fde = mpx_fde;
+ mpx_fde = NULL;
+ }
+ flags |= TEVENT_FD_READ;
+ }
+
+ if (events[i].portev_events & POLLIN) {
+ flags |= TEVENT_FD_READ;
+ }
+ if (events[i].portev_events & POLLOUT) {
+ flags |= TEVENT_FD_WRITE;
+ }
+
+ if (flags & TEVENT_FD_WRITE) {
+ if (fde->flags & TEVENT_FD_WRITE) {
+ mpx_fde = NULL;
+ }
+ if (mpx_fde && (mpx_fde->flags & TEVENT_FD_WRITE)) {
+ fde = mpx_fde;
+ mpx_fde = NULL;
+ }
+
+ if (mpx_fde) {
+ /* Ensure we got the right fde. */
+ if ((flags & fde->flags) == 0) {
+ fde = mpx_fde;
+ mpx_fde = NULL;
+ }
+ }
+ }
+
+ /*
+ * Make sure we only pass the flags
+ * the handler is expecting.
+ */
+ flags &= fde->flags;
+ if (flags) {
+ return tevent_common_invoke_fd_handler(fde, flags, NULL);
+ }
+ }
+
+ return 0;
+}
+
+
+/*
+ create a port_event_context structure.
+*/
+static int port_event_context_init(struct tevent_context *ev)
+{
+ int ret;
+ struct port_event_context *port_ev;
+
+ /*
+ * We might be called during tevent_re_initialise()
+ * which means we need to free our old additional_data.
+ */
+ TALLOC_FREE(ev->additional_data);
+
+ port_ev = talloc_zero(ev, struct port_event_context);
+ if (!port_ev) {
+ return -1;
+ }
+ port_ev->ev = ev;
+ port_ev->port_fd = -1;
+ port_ev->pid = (pid_t)-1;
+
+ ret = port_init_ctx(port_ev);
+ if (ret != 0) {
+ talloc_free(port_ev);
+ return ret;
+ }
+
+ ev->additional_data = port_ev;
+ return 0;
+}
+
+/*
+ destroy an fd_event
+*/
+static int port_event_fd_destructor(struct tevent_fd *fde)
+{
+ struct tevent_context *ev = fde->event_ctx;
+ struct port_event_context *port_ev = NULL;
+ struct tevent_fd *mpx_fde = NULL;
+ int flags = (int)fde->flags;
+
+ if (ev == NULL) {
+ return tevent_common_fd_destructor(fde);
+ }
+
+ port_ev = talloc_get_type_abort(ev->additional_data,
+ struct port_event_context);
+
+ DLIST_REMOVE(ev->fd_events, fde);
+
+ if (fde->additional_flags & PORT_ADDITIONAL_FD_FLAG_HAS_MPX) {
+ mpx_fde = talloc_get_type_abort(fde->additional_data,
+ struct tevent_fd);
+
+ fde->additional_flags &= ~PORT_ADDITIONAL_FD_FLAG_HAS_MPX;
+ mpx_fde->additional_flags &= ~PORT_ADDITIONAL_FD_FLAG_HAS_MPX;
+
+ fde->additional_data = NULL;
+ mpx_fde->additional_data = NULL;
+
+ fde->additional_flags &= PORT_ADDITIONAL_FD_FLAG_HAS_ASSOCIATION;
+ }
+
+ (void)port_check_reopen(port_ev);
+
+ if (mpx_fde != NULL) {
+ (void)port_update_event(port_ev, mpx_fde);
+ }
+
+ fde->flags = 0;
+ (void)port_update_event(port_ev, fde);
+ fde->flags = flags;
+
+ return tevent_common_fd_destructor(fde);
+}
+
+/*
+ add a fd based event
+ return NULL on failure (memory allocation error)
+*/
+static struct tevent_fd *port_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 port_event_context *port_ev =
+ talloc_get_type_abort(ev->additional_data,
+ struct port_event_context);
+ struct tevent_fd *fde;
+
+ fde = tevent_common_add_fd(ev, mem_ctx, fd, flags,
+ handler, private_data,
+ handler_name, location);
+ if (!fde) {
+ return NULL;
+ }
+
+ talloc_set_destructor(fde, port_event_fd_destructor);
+
+ if (port_check_reopen(port_ev) != 0) {
+ TALLOC_FREE(fde);
+ return NULL;
+ }
+
+ if (port_update_event(port_ev, fde) != 0) {
+ TALLOC_FREE(fde);
+ return NULL;
+ }
+
+ return fde;
+}
+
+/*
+ set the fd event flags
+*/
+static void port_event_set_fd_flags(struct tevent_fd *fde, uint16_t flags)
+{
+ struct tevent_context *ev;
+ struct port_event_context *port_ev;
+
+ if (fde->flags == flags) {
+ return;
+ }
+
+ ev = fde->event_ctx;
+ port_ev = talloc_get_type_abort(ev->additional_data,
+ struct port_event_context);
+
+ fde->flags = flags;
+
+ (void)port_check_reopen(port_ev);
+ (void)port_update_event(port_ev, fde);
+}
+
+/*
+ do a single event loop using the events defined in ev
+*/
+static int port_event_loop_once(struct tevent_context *ev, const char *location)
+{
+ struct port_event_context *port_ev = talloc_get_type(ev->additional_data,
+ struct port_event_context);
+ struct timeval tval;
+
+ if (ev->signal_events &&
+ tevent_common_check_signal(ev)) {
+ return 0;
+ }
+
+ if (ev->threaded_contexts != NULL) {
+ tevent_common_threaded_activate_immediate(ev);
+ }
+
+ if (ev->immediate_events &&
+ tevent_common_loop_immediate(ev)) {
+ return 0;
+ }
+
+ tval = tevent_common_loop_timer_delay(ev);
+ if (tevent_timeval_is_zero(&tval)) {
+ return 0;
+ }
+
+ if (port_check_reopen(port_ev) != 0) {
+ errno = EINVAL;
+ return -1;
+ }
+ return port_event_loop(port_ev, &tval);
+}
+
+static const struct tevent_ops port_event_ops = {
+ .context_init = port_event_context_init,
+ .add_fd = port_event_add_fd,
+ .set_fd_close_fn = tevent_common_fd_set_close_fn,
+ .get_fd_flags = tevent_common_fd_get_flags,
+ .set_fd_flags = port_event_set_fd_flags,
+ .add_timer = tevent_common_add_timer_v2,
+ .schedule_immediate = tevent_common_schedule_immediate,
+ .add_signal = tevent_common_add_signal,
+ .loop_once = port_event_loop_once,
+ .loop_wait = tevent_common_loop_wait,
+};
+
+_PRIVATE_ bool tevent_port_init(void)
+{
+ if (!tevent_register_backend("port", &port_event_ops)) {
+ return false;
+ }
+ tevent_set_default_backend("port");
+ return true;
+}