static void tlsp_drain(char *unused_service, char **unused_argv)
{
int count;
/*
* After "postfix reload", complete work-in-progress in the background,
* instead of dropping already-accepted connections on the floor.
*
* All error retry counts shall be limited. Instead of blocking here, we
* could retry failed fork() operations in the event call-back routines,
* but we don't need perfection. The host system is severely overloaded
* and service levels are already way down.
*/
for (count = 0; /* see below */ ; count++) {
if (count >= 5) {
msg_fatal("fork: %m");
} else if (event_server_drain() != 0) {
msg_warn("fork: %m");
sleep(1);
continue;
} else {
return;
}
}
}
static void pre_accept(char *unused_name, char **unused_argv)
{
static time_t last_event_time;
time_t new_event_time;
const char *name;
/*
* If some table has changed then stop accepting new connections. Don't
* check the tables more than once a second.
*/
new_event_time = event_time();
if (new_event_time >= last_event_time + 1
&& (name = dict_changed_name()) != 0) {
msg_info("table %s has changed - finishing in the background", name);
event_server_drain();
} else {
last_event_time = new_event_time;
}
}
static void psc_drain(char *unused_service, char **unused_argv)
{
int count;
/*
* After "postfix reload", complete work-in-progress in the background,
* instead of dropping already-accepted connections on the floor.
*
* Unfortunately we must close all writable tables, so we can't store or
* look up reputation information. The reason is that we don't have any
* multi-writer safety guarantees. We also can't use the single-writer
* proxywrite service, because its latency guarantees are too weak.
*
* All error retry counts shall be limited. Instead of blocking here, we
* could retry failed fork() operations in the event call-back routines,
* but we don't need perfection. The host system is severely overloaded
* and service levels are already way down.
*
* XXX Some Berkeley DB versions break with close-after-fork. Every new
* version is an improvement over its predecessor.
*/
if (psc_cache_map != 0 /* XXX && psc_cache_map
requires locking */ ) {
dict_cache_close(psc_cache_map);
psc_cache_map = 0;
}
for (count = 0; /* see below */ ; count++) {
if (count >= 5) {
msg_fatal("fork: %m");
} else if (event_server_drain() != 0) {
msg_warn("fork: %m");
sleep(1);
continue;
} else {
return;
}
}
}
