-/* $Id$ */
-
/***
This file is part of avahi.
-
+
avahi 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 2.1 of the
License, or (at your option) any later version.
-
+
avahi 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 avahi; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
struct AvahiQueryJob {
unsigned id;
int n_posted;
-
+
AvahiQueryScheduler *scheduler;
AvahiTimeEvent *time_event;
-
+
int done;
struct timeval delivery;
* entries) most of the time, but this might be a wrong
* assumption, especially on setups where traffic reflection is
* involved. */
-
+
AVAHI_LLIST_FIELDS(AvahiQueryJob, jobs);
};
static AvahiQueryJob* job_new(AvahiQueryScheduler *s, AvahiKey *key, int done) {
AvahiQueryJob *qj;
-
+
assert(s);
assert(key);
avahi_log_error(__FILE__": Out of memory");
return NULL;
}
-
+
qj->scheduler = s;
qj->key = avahi_key_ref(key);
qj->time_event = NULL;
qj->n_posted = 1;
qj->id = s->next_id++;
-
- if ((qj->done = done))
+
+ if ((qj->done = done))
AVAHI_LLIST_PREPEND(AvahiQueryJob, jobs, s->history, qj);
else
AVAHI_LLIST_PREPEND(AvahiQueryJob, jobs, s->jobs, qj);
avahi_log_error(__FILE__": Out of memory");
return NULL; /* OOM */
}
-
+
s->interface = i;
s->time_event_queue = i->monitor->server->time_event_queue;
s->next_id = 0;
-
+
AVAHI_LLIST_HEAD_INIT(AvahiQueryJob, s->jobs);
AVAHI_LLIST_HEAD_INIT(AvahiQueryJob, s->history);
AVAHI_LLIST_HEAD_INIT(AvahiKnownAnswer, s->known_answers);
void avahi_query_scheduler_clear(AvahiQueryScheduler *s) {
assert(s);
-
+
while (s->jobs)
job_free(s, s->jobs);
while (s->history)
static void* known_answer_walk_callback(AvahiCache *c, AvahiKey *pattern, AvahiCacheEntry *e, void* userdata) {
AvahiQueryScheduler *s = userdata;
AvahiKnownAnswer *ka;
-
+
assert(c);
assert(pattern);
assert(e);
if (avahi_cache_entry_half_ttl(c, e))
return NULL;
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+
if (!(ka = avahi_new0(AvahiKnownAnswer, 1))) {
avahi_log_error(__FILE__": Out of memory");
return NULL;
}
-
+
ka->scheduler = s;
ka->record = avahi_record_ref(e->record);
/* Add all matching known answers to the list */
avahi_cache_walk(s->interface->cache, qj->key, known_answer_walk_callback, s);
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+
job_mark_done(s, qj);
return 1;
assert(p);
n = 0;
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+
while ((ka = s->known_answers)) {
int too_large = 0;
if (!too_large)
n++;
}
-
+
avahi_dns_packet_set_field(p, AVAHI_DNS_FIELD_ANCOUNT, n);
avahi_interface_send_packet(s->interface, p);
avahi_dns_packet_free(p);
}
assert(!s->known_answers);
-
+
if (!(p = avahi_dns_packet_new_query(s->interface->hardware->mtu)))
return; /* OOM */
-
+
b = packet_add_query_job(s, p, qj);
assert(b); /* An query must always fit in */
n = 1;
for (qj = s->jobs; qj; qj = qj->jobs_next) {
assert(!qj->done);
-
+
if (avahi_key_equal(qj->key, key))
return qj;
}
static AvahiQueryJob* find_history_job(AvahiQueryScheduler *s, AvahiKey *key) {
AvahiQueryJob *qj;
-
+
assert(s);
assert(key);
job_free(s, qj);
return NULL;
}
-
+
return qj;
}
}
int avahi_query_scheduler_post(AvahiQueryScheduler *s, AvahiKey *key, int immediately, unsigned *ret_id) {
struct timeval tv;
AvahiQueryJob *qj;
-
+
assert(s);
assert(key);
if ((qj = find_history_job(s, key)))
return 0;
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+
avahi_elapse_time(&tv, immediately ? 0 : AVAHI_QUERY_DEFER_MSEC, 0);
if ((qj = find_scheduled_job(s, key))) {
}
qj->n_posted++;
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+
} else {
if (!(qj = job_new(s, key, 0)))
return 0; /* OOM */
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+
qj->delivery = tv;
qj->time_event = avahi_time_event_new(s->time_event_queue, &qj->delivery, elapse_callback, qj);
}
if (ret_id)
*ret_id = qj->id;
-
+
return 1;
}
void avahi_query_scheduler_incoming(AvahiQueryScheduler *s, AvahiKey *key) {
AvahiQueryJob *qj;
-
+
assert(s);
assert(key);
if (!(qj = find_history_job(s, key)))
if (!(qj = job_new(s, key, 1)))
return; /* OOM */
-
+
gettimeofday(&qj->delivery, NULL);
job_set_elapse_time(s, qj, AVAHI_QUERY_HISTORY_MSEC, 0);
}
int avahi_query_scheduler_withdraw_by_id(AvahiQueryScheduler *s, unsigned id) {
AvahiQueryJob *qj;
-
+
assert(s);
/* Very short lived queries can withdraw an already scheduled item
for (qj = s->jobs; qj; qj = qj->jobs_next) {
assert(!qj->done);
-
+
if (qj->id == id) {
/* Entry found */
* case since there should exist only one querier per
* key, but there are exceptions, notably reflected
* traffic.) */
-
+
job_free(s, qj);
return 1;
}