static void trigger_server_wakeup(int fd)
{
char buf[TRIGGER_BUF_SIZE];
int len;
/*
* Commit suicide when the master process disconnected from us. Don't
* drop the already accepted client request after "postfix reload"; that
* would be rude.
*/
if (master_notify(var_pid, trigger_server_generation, MASTER_STAT_TAKEN) < 0)
/* void */ ;
if (trigger_server_in_flow_delay && mail_flow_get(1) < 0)
doze(var_in_flow_delay * 1000000);
if ((len = read(fd, buf, sizeof(buf))) >= 0)
trigger_server_service(buf, len, trigger_server_name,
trigger_server_argv);
if (master_notify(var_pid, trigger_server_generation, MASTER_STAT_AVAIL) < 0)
trigger_server_abort(EVENT_NULL_TYPE, EVENT_NULL_CONTEXT);
if (var_idle_limit > 0)
event_request_timer(trigger_server_timeout, (char *) 0, var_idle_limit);
/* Avoid integer wrap-around in a persistent process. */
if (use_count < INT_MAX)
use_count++;
}
static void multi_server_wakeup(int fd, HTABLE *attr)
{
VSTREAM *stream;
char *tmp;
#if defined(F_DUPFD) && (EVENTS_STYLE != EVENTS_STYLE_SELECT)
#ifndef THRESHOLD_FD_WORKAROUND
#define THRESHOLD_FD_WORKAROUND 128
#endif
int new_fd;
/*
* Leave some handles < FD_SETSIZE for DBMS libraries, in the unlikely
* case of a multi-server with a thousand clients.
*/
if (fd < THRESHOLD_FD_WORKAROUND) {
if ((new_fd = fcntl(fd, F_DUPFD, THRESHOLD_FD_WORKAROUND)) < 0)
msg_fatal("fcntl F_DUPFD: %m");
(void) close(fd);
fd = new_fd;
}
#endif
if (msg_verbose)
msg_info("connection established fd %d", fd);
non_blocking(fd, BLOCKING);
close_on_exec(fd, CLOSE_ON_EXEC);
client_count++;
stream = vstream_fdopen(fd, O_RDWR);
tmp = concatenate(multi_server_name, " socket", (char *) 0);
vstream_control(stream,
VSTREAM_CTL_PATH, tmp,
VSTREAM_CTL_CONTEXT, (char *) attr,
VSTREAM_CTL_END);
myfree(tmp);
timed_ipc_setup(stream);
multi_server_saved_flags = vstream_flags(stream);
if (multi_server_in_flow_delay && mail_flow_get(1) < 0)
event_request_timer(multi_server_enable_read, (char *) stream,
var_in_flow_delay);
else
multi_server_enable_read(0, (char *) stream);
}
static void single_server_wakeup(int fd, HTABLE *attr)
{
VSTREAM *stream;
char *tmp;
/*
* If the accept() succeeds, be sure to disable non-blocking I/O, because
* the application is supposed to be single-threaded. Notice the master
* of our (un)availability to service connection requests. Commit suicide
* when the master process disconnected from us. Don't drop the already
* accepted client request after "postfix reload"; that would be rude.
*/
if (msg_verbose)
msg_info("connection established");
non_blocking(fd, BLOCKING);
close_on_exec(fd, CLOSE_ON_EXEC);
stream = vstream_fdopen(fd, O_RDWR);
tmp = concatenate(single_server_name, " socket", (char *) 0);
vstream_control(stream,
CA_VSTREAM_CTL_PATH(tmp),
CA_VSTREAM_CTL_CONTEXT((void *) attr),
CA_VSTREAM_CTL_END);
myfree(tmp);
timed_ipc_setup(stream);
if (master_notify(var_pid, single_server_generation, MASTER_STAT_TAKEN) < 0)
/* void */ ;
if (single_server_in_flow_delay && mail_flow_get(1) < 0)
doze(var_in_flow_delay * 1000000);
single_server_service(stream, single_server_name, single_server_argv);
(void) vstream_fclose(stream);
if (master_notify(var_pid, single_server_generation, MASTER_STAT_AVAIL) < 0)
single_server_abort(EVENT_NULL_TYPE, EVENT_NULL_CONTEXT);
if (msg_verbose)
msg_info("connection closed");
/* Avoid integer wrap-around in a persistent process. */
if (use_count < INT_MAX)
use_count++;
if (var_idle_limit > 0)
event_request_timer(single_server_timeout, (void *) 0, var_idle_limit);
if (attr)
htable_free(attr, myfree);
}
static void trigger_server_wakeup(int fd)
{
char buf[TRIGGER_BUF_SIZE];
int len;
/*
* Commit suicide when the master process disconnected from us.
*/
if (master_notify(var_pid, MASTER_STAT_TAKEN) < 0)
trigger_server_abort(EVENT_NULL_TYPE, EVENT_NULL_CONTEXT);
if (trigger_server_in_flow_delay && mail_flow_get(1) < 0)
doze(var_in_flow_delay * 1000000);
if ((len = read(fd, buf, sizeof(buf))) >= 0)
trigger_server_service(buf, len, trigger_server_name,
trigger_server_argv);
if (master_notify(var_pid, MASTER_STAT_AVAIL) < 0)
trigger_server_abort(EVENT_NULL_TYPE, EVENT_NULL_CONTEXT);
if (var_idle_limit > 0)
event_request_timer(trigger_server_timeout, (char *) 0, var_idle_limit);
use_count++;
}
static int qmgr_loop(char *unused_name, char **unused_argv)
{
char *path;
int token_count;
int feed = 0;
int scan_idx; /* Priority order scan index */
static int first_scan_idx = QMGR_SCAN_IDX_INCOMING;
int last_scan_idx = QMGR_SCAN_IDX_COUNT - 1;
int delay;
/*
* This routine runs as part of the event handling loop, after the event
* manager has delivered a timer or I/O event (including the completion
* of a connection to a delivery process), or after it has waited for a
* specified amount of time. The result value of qmgr_loop() specifies
* how long the event manager should wait for the next event.
*/
#define DONT_WAIT 0
#define WAIT_FOR_EVENT (-1)
/*
* Attempt to drain the active queue by allocating a suitable delivery
* process and by delivering mail via it. Delivery process allocation and
* mail delivery are asynchronous.
*/
qmgr_active_drain();
/*
* Let some new blood into the active queue when the queue size is
* smaller than some configurable limit, and when the number of in-core
* recipients does not exceed some configurable limit.
*
* We import one message per interrupt, to optimally tune the input count
* for the number of delivery agent protocol wait states, as explained in
* qmgr_transport.c.
*/
delay = WAIT_FOR_EVENT;
for (scan_idx = 0; qmgr_message_count < var_qmgr_active_limit
&& qmgr_recipient_count < var_qmgr_rcpt_limit
&& scan_idx < QMGR_SCAN_IDX_COUNT; ++scan_idx) {
last_scan_idx = (scan_idx + first_scan_idx) % QMGR_SCAN_IDX_COUNT;
if ((path = qmgr_scan_next(qmgr_scans[last_scan_idx])) != 0) {
delay = DONT_WAIT;
if ((feed = qmgr_active_feed(qmgr_scans[last_scan_idx], path)) != 0)
break;
}
}
/*
* Round-robin the queue scans. When the active queue becomes full,
* prefer new mail over deferred mail.
*/
if (qmgr_message_count < var_qmgr_active_limit
&& qmgr_recipient_count < var_qmgr_rcpt_limit) {
first_scan_idx = (last_scan_idx + 1) % QMGR_SCAN_IDX_COUNT;
} else if (first_scan_idx != QMGR_SCAN_IDX_INCOMING) {
first_scan_idx = QMGR_SCAN_IDX_INCOMING;
}
/*
* Global flow control. If enabled, slow down receiving processes that
* get ahead of the queue manager, but don't block them completely.
*/
if (var_in_flow_delay > 0) {
token_count = mail_flow_count();
if (token_count < var_proc_limit) {
if (feed != 0 && last_scan_idx == QMGR_SCAN_IDX_INCOMING)
mail_flow_put(1);
else if (qmgr_scans[QMGR_SCAN_IDX_INCOMING]->handle == 0)
mail_flow_put(var_proc_limit - token_count);
} else if (token_count > var_proc_limit) {
mail_flow_get(token_count - var_proc_limit);
}
}
return (delay);
}
