static void single_server_accept_local(int unused_event, void *context)
{
int listen_fd = CAST_ANY_PTR_TO_INT(context);
int time_left = -1;
int fd;
/*
* Be prepared for accept() to fail because some other process already
* got the connection. We use select() + accept(), instead of simply
* blocking in accept(), because we must be able to detect that the
* master process has gone away unexpectedly.
*/
if (var_idle_limit > 0)
time_left = event_cancel_timer(single_server_timeout, (void *) 0);
if (single_server_pre_accept)
single_server_pre_accept(single_server_name, single_server_argv);
fd = LOCAL_ACCEPT(listen_fd);
if (single_server_lock != 0
&& myflock(vstream_fileno(single_server_lock), INTERNAL_LOCK,
MYFLOCK_OP_NONE) < 0)
msg_fatal("select unlock: %m");
if (fd < 0) {
if (errno != EAGAIN)
msg_error("accept connection: %m");
if (time_left >= 0)
event_request_timer(single_server_timeout, (void *) 0, time_left);
return;
}
single_server_wakeup(fd, (HTABLE *) 0);
}
static void multi_server_accept_local(int unused_event, char *context)
{
int listen_fd = CAST_CHAR_PTR_TO_INT(context);
int time_left = -1;
int fd;
/*
* Be prepared for accept() to fail because some other process already
* got the connection (the number of processes competing for clients is
* kept small, so this is not a "thundering herd" problem). If the
* accept() succeeds, be sure to disable non-blocking I/O, in order to
* minimize confusion.
*/
if (client_count == 0 && var_idle_limit > 0)
time_left = event_cancel_timer(multi_server_timeout, (char *) 0);
if (multi_server_pre_accept)
multi_server_pre_accept(multi_server_name, multi_server_argv);
fd = LOCAL_ACCEPT(listen_fd);
if (multi_server_lock != 0
&& myflock(vstream_fileno(multi_server_lock), INTERNAL_LOCK,
MYFLOCK_OP_NONE) < 0)
msg_fatal("select unlock: %m");
if (fd < 0) {
if (errno != EAGAIN)
msg_error("accept connection: %m");
if (time_left >= 0)
event_request_timer(multi_server_timeout, (char *) 0, time_left);
return;
}
multi_server_wakeup(fd, (HTABLE *) 0);
}
static void trigger_server_accept_local(int unused_event, char *context)
{
const char *myname = "trigger_server_accept_local";
int listen_fd = CAST_CHAR_PTR_TO_INT(context);
int time_left = 0;
int fd;
if (msg_verbose)
msg_info("%s: trigger arrived", myname);
/*
* Read a message from a socket. Be prepared for accept() to fail because
* some other process already got the connection. The socket is
* non-blocking so we won't get stuck when multiple processes wake up.
* Don't get stuck when the client connects but sends no data. Restart
* the idle timer if this was a false alarm.
*/
if (var_idle_limit > 0)
time_left = event_cancel_timer(trigger_server_timeout, (char *) 0);
if (trigger_server_pre_accept)
trigger_server_pre_accept(trigger_server_name, trigger_server_argv);
fd = LOCAL_ACCEPT(listen_fd);
if (trigger_server_lock != 0
&& myflock(vstream_fileno(trigger_server_lock), INTERNAL_LOCK,
MYFLOCK_OP_NONE) < 0)
msg_fatal("select unlock: %m");
if (fd < 0) {
if (errno != EAGAIN)
msg_error("accept connection: %m");
if (time_left >= 0)
event_request_timer(trigger_server_timeout, (char *) 0, time_left);
return;
}
close_on_exec(fd, CLOSE_ON_EXEC);
if (read_wait(fd, 10) == 0)
trigger_server_wakeup(fd);
else if (time_left >= 0)
event_request_timer(trigger_server_timeout, (char *) 0, time_left);
close(fd);
}
