rtnl->original_pid = getpid();
+ LIST_HEAD_INIT(rtnl->match_callbacks);
+
/* We guarantee that wqueue always has space for at least
* one entry */
rtnl->wqueue = new(sd_rtnl_message*, 1);
socklen_t addrlen;
int r;
+ assert_return(ret, -EINVAL);
+
r = sd_rtnl_new(&rtnl);
if (r < 0)
return r;
sd_rtnl *sd_rtnl_unref(sd_rtnl *rtnl) {
if (rtnl && REFCNT_DEC(rtnl->n_ref) <= 0) {
+ struct match_callback *f;
unsigned i;
for (i = 0; i < rtnl->rqueue_size; i++)
hashmap_free_free(rtnl->reply_callbacks);
prioq_free(rtnl->reply_callbacks_prioq);
+ while ((f = rtnl->match_callbacks)) {
+ LIST_REMOVE(match_callbacks, rtnl->match_callbacks, f);
+ free(f);
+ }
+
if (rtnl->fd >= 0)
close_nointr_nofail(rtnl->fd);
return r;
}
+static int process_match(sd_rtnl *rtnl, sd_rtnl_message *m) {
+ struct match_callback *c;
+ uint16_t type;
+ int r;
+
+ assert(rtnl);
+ assert(m);
+
+ r = sd_rtnl_message_get_type(m, &type);
+ if (r < 0)
+ return r;
+
+ LIST_FOREACH(match_callbacks, c, rtnl->match_callbacks) {
+ if (type & c->types) {
+ r = c->callback(rtnl, m, c->userdata);
+ if (r != 0)
+ return r;
+ }
+ }
+
+ return 0;
+}
+
static int process_running(sd_rtnl *rtnl, sd_rtnl_message **ret) {
_cleanup_sd_rtnl_message_unref_ sd_rtnl_message *m = NULL;
int r;
+ assert(rtnl);
+
r = process_timeout(rtnl);
if (r != 0)
goto null_message;
if (r != 0)
goto null_message;
+ r = process_match(rtnl, m);
+ if (r != 0)
+ goto null_message;
+
if (ret) {
*ret = m;
m = NULL;
return now(CLOCK_MONOTONIC) + usec;
}
-static int rtnl_poll(sd_rtnl *nl, uint64_t timeout_usec) {
+static int rtnl_poll(sd_rtnl *rtnl, bool need_more, uint64_t timeout_usec) {
struct pollfd p[1] = {};
struct timespec ts;
- int r;
+ usec_t m = (usec_t) -1;
+ int r, e;
+
+ assert(rtnl);
+
+ e = sd_rtnl_get_events(rtnl);
+ if (e < 0)
+ return e;
+
+ if (need_more)
+ /* Caller wants more data, and doesn't care about
+ * what's been read or any other timeouts. */
+ return e |= POLLIN;
+ else {
+ usec_t until;
+ /* Caller wants to process if there is something to
+ * process, but doesn't care otherwise */
+
+ r = sd_rtnl_get_timeout(rtnl, &until);
+ if (r < 0)
+ return r;
+ if (r > 0) {
+ usec_t nw;
+ nw = now(CLOCK_MONOTONIC);
+ m = until > nw ? until - nw : 0;
+ }
+ }
- assert(nl);
+ if (timeout_usec != (uint64_t) -1 && (m == (uint64_t) -1 || timeout_usec < m))
+ m = timeout_usec;
- p[0].fd = nl->fd;
- p[0].events = POLLIN;
+ p[0].fd = rtnl->fd;
+ p[0].events = e;
- r = ppoll(p, 1, timeout_usec == (uint64_t) -1 ? NULL :
- timespec_store(&ts, timeout_usec), NULL);
+ r = ppoll(p, 1, m == (uint64_t) -1 ? NULL : timespec_store(&ts, m), NULL);
if (r < 0)
return -errno;
if (nl->rqueue_size > 0)
return 0;
- return rtnl_poll(nl, timeout_usec);
+ return rtnl_poll(nl, false, timeout_usec);
}
static int timeout_compare(const void *a, const void *b) {
} else
left = (uint64_t) -1;
- r = rtnl_poll(nl, left);
+ r = rtnl_poll(nl, true, left);
if (r < 0)
return r;
return r;
}
}
+
+int sd_rtnl_flush(sd_rtnl *rtnl) {
+ int r;
+
+ assert_return(rtnl, -EINVAL);
+ assert_return(!rtnl_pid_changed(rtnl), -ECHILD);
+
+ if (rtnl->wqueue_size <= 0)
+ return 0;
+
+ for (;;) {
+ r = dispatch_wqueue(rtnl);
+ if (r < 0)
+ return r;
+
+ if (rtnl->wqueue_size <= 0)
+ return 0;
+
+ r = rtnl_poll(rtnl, false, (uint64_t) -1);
+ if (r < 0)
+ return r;
+ }
+}
+
+int sd_rtnl_get_events(sd_rtnl *rtnl) {
+ int flags = 0;
+
+ assert_return(rtnl, -EINVAL);
+ assert_return(!rtnl_pid_changed(rtnl), -ECHILD);
+
+ if (rtnl->rqueue_size <= 0)
+ flags |= POLLIN;
+ if (rtnl->wqueue_size > 0)
+ flags |= POLLOUT;
+
+ return flags;
+}
+
+int sd_rtnl_get_timeout(sd_rtnl *rtnl, uint64_t *timeout_usec) {
+ struct reply_callback *c;
+
+ assert_return(rtnl, -EINVAL);
+ assert_return(timeout_usec, -EINVAL);
+ assert_return(!rtnl_pid_changed(rtnl), -ECHILD);
+
+ if (rtnl->rqueue_size > 0) {
+ *timeout_usec = 0;
+ return 1;
+ }
+
+ c = prioq_peek(rtnl->reply_callbacks_prioq);
+ if (!c) {
+ *timeout_usec = (uint64_t) -1;
+ return 0;
+ }
+
+ *timeout_usec = c->timeout;
+
+ return 1;
+}
+
+static int io_callback(sd_event_source *s, int fd, uint32_t revents, void *userdata) {
+ sd_rtnl *rtnl = userdata;
+ int r;
+
+ assert(rtnl);
+
+ r = sd_rtnl_process(rtnl, NULL);
+ if (r < 0)
+ return r;
+
+ return 1;
+}
+
+static int time_callback(sd_event_source *s, uint64_t usec, void *userdata) {
+ sd_rtnl *rtnl = userdata;
+ int r;
+
+ assert(rtnl);
+
+ r = sd_rtnl_process(rtnl, NULL);
+ if (r < 0)
+ return r;
+
+ return 1;
+}
+
+static int prepare_callback(sd_event_source *s, void *userdata) {
+ sd_rtnl *rtnl = userdata;
+ int r, e;
+ usec_t until;
+
+ assert(s);
+ assert(rtnl);
+
+ e = sd_rtnl_get_events(rtnl);
+ if (e < 0)
+ return e;
+
+ r = sd_event_source_set_io_events(rtnl->io_event_source, e);
+ if (r < 0)
+ return r;
+
+ r = sd_rtnl_get_timeout(rtnl, &until);
+ if (r < 0)
+ return r;
+ if (r > 0) {
+ int j;
+
+ j = sd_event_source_set_time(rtnl->time_event_source, until);
+ if (j < 0)
+ return j;
+ }
+
+ r = sd_event_source_set_enabled(rtnl->time_event_source, r > 0);
+ if (r < 0)
+ return r;
+
+ return 1;
+}
+
+static int exit_callback(sd_event_source *event, void *userdata) {
+ sd_rtnl *rtnl = userdata;
+
+ assert(event);
+
+ sd_rtnl_flush(rtnl);
+
+ return 1;
+}
+
+int sd_rtnl_attach_event(sd_rtnl *rtnl, sd_event *event, int priority) {
+ int r;
+
+ assert_return(rtnl, -EINVAL);
+ assert_return(!rtnl->event, -EBUSY);
+
+ assert(!rtnl->io_event_source);
+ assert(!rtnl->time_event_source);
+
+ if (event)
+ rtnl->event = sd_event_ref(event);
+ else {
+ r = sd_event_default(&rtnl->event);
+ if (r < 0)
+ return r;
+ }
+
+ r = sd_event_add_io(rtnl->event, rtnl->fd, 0, io_callback, rtnl, &rtnl->io_event_source);
+ if (r < 0)
+ goto fail;
+
+ r = sd_event_source_set_priority(rtnl->io_event_source, priority);
+ if (r < 0)
+ goto fail;
+
+ r = sd_event_source_set_prepare(rtnl->io_event_source, prepare_callback);
+ if (r < 0)
+ goto fail;
+
+ r = sd_event_add_monotonic(rtnl->event, 0, 0, time_callback, rtnl, &rtnl->time_event_source);
+ if (r < 0)
+ goto fail;
+
+ r = sd_event_source_set_priority(rtnl->time_event_source, priority);
+ if (r < 0)
+ goto fail;
+
+ r = sd_event_add_exit(rtnl->event, exit_callback, rtnl, &rtnl->exit_event_source);
+ if (r < 0)
+ goto fail;
+
+ return 0;
+
+fail:
+ sd_rtnl_detach_event(rtnl);
+ return r;
+}
+
+int sd_rtnl_detach_event(sd_rtnl *rtnl) {
+ assert_return(rtnl, -EINVAL);
+ assert_return(rtnl->event, -ENXIO);
+
+ if (rtnl->io_event_source)
+ rtnl->io_event_source = sd_event_source_unref(rtnl->io_event_source);
+
+ if (rtnl->time_event_source)
+ rtnl->time_event_source = sd_event_source_unref(rtnl->time_event_source);
+
+ if (rtnl->exit_event_source)
+ rtnl->exit_event_source = sd_event_source_unref(rtnl->exit_event_source);
+
+ if (rtnl->event)
+ rtnl->event = sd_event_unref(rtnl->event);
+
+ return 0;
+}
+
+int sd_rtnl_add_match(sd_rtnl *rtnl,
+ uint16_t types,
+ sd_rtnl_message_handler_t callback,
+ void *userdata) {
+ struct match_callback *c;
+
+ assert_return(rtnl, -EINVAL);
+ assert_return(callback, -EINVAL);
+ assert_return(types, -EINVAL);
+ assert_return(!rtnl_pid_changed(rtnl), -ECHILD);
+
+ c = new0(struct match_callback, 1);
+ if (!c)
+ return -ENOMEM;
+
+ c->callback = callback;
+ c->types = types;
+ c->userdata = userdata;
+
+ LIST_PREPEND(match_callbacks, rtnl->match_callbacks, c);
+
+ return 0;
+}
+
+int sd_rtnl_remove_match(sd_rtnl *rtnl,
+ uint16_t types,
+ sd_rtnl_message_handler_t callback,
+ void *userdata) {
+ struct match_callback *c;
+
+ assert_return(rtnl, -EINVAL);
+ assert_return(callback, -EINVAL);
+ assert_return(!rtnl_pid_changed(rtnl), -ECHILD);
+
+ LIST_FOREACH(match_callbacks, c, rtnl->match_callbacks)
+ if (c->callback == callback && c->types == types && c->userdata == userdata) {
+ LIST_REMOVE(match_callbacks, rtnl->match_callbacks, c);
+ free(c);
+
+ return 1;
+ }
+
+ return 0;
+}
~ianmdlvl / elogind.git / blobdiff