int ap_mpm_run(apr_pool_t *_pconf, apr_pool_t *plog, server_rec *s)
{
int index;
int remaining_children_to_start;
apr_status_t rv;
ap_log_pid(pconf, ap_pid_fname);
first_server_limit = server_limit;
if (changed_limit_at_restart) {
ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s,
"WARNING: Attempt to change ServerLimit "
"ignored during restart");
changed_limit_at_restart = 0;
}
/* Initialize cross-process accept lock */
ap_lock_fname = apr_psprintf(_pconf, "%s.%" APR_PID_T_FMT,
ap_server_root_relative(_pconf, ap_lock_fname),
ap_my_pid);
rv = apr_proc_mutex_create(&accept_mutex, ap_lock_fname,
ap_accept_lock_mech, _pconf);
if (rv != APR_SUCCESS) {
ap_log_error(APLOG_MARK, APLOG_EMERG, rv, s,
"Couldn't create accept lock");
mpm_state = AP_MPMQ_STOPPING;
return 1;
}
#if APR_USE_SYSVSEM_SERIALIZE
if (ap_accept_lock_mech == APR_LOCK_DEFAULT ||
ap_accept_lock_mech == APR_LOCK_SYSVSEM) {
#else
if (ap_accept_lock_mech == APR_LOCK_SYSVSEM) {
#endif
rv = unixd_set_proc_mutex_perms(accept_mutex);
if (rv != APR_SUCCESS) {
ap_log_error(APLOG_MARK, APLOG_EMERG, rv, s,
"Couldn't set permissions on cross-process lock; "
"check User and Group directives");
mpm_state = AP_MPMQ_STOPPING;
return 1;
}
}
if (!is_graceful) {
if (ap_run_pre_mpm(s->process->pool, SB_SHARED) != OK) {
mpm_state = AP_MPMQ_STOPPING;
return 1;
}
/* fix the generation number in the global score; we just got a new,
* cleared scoreboard
*/
ap_scoreboard_image->global->running_generation = ap_my_generation;
}
set_signals();
if (one_process) {
AP_MONCONTROL(1);
}
if (ap_daemons_max_free < ap_daemons_min_free + 1) /* Don't thrash... */
ap_daemons_max_free = ap_daemons_min_free + 1;
/* If we're doing a graceful_restart then we're going to see a lot
* of children exiting immediately when we get into the main loop
* below (because we just sent them AP_SIG_GRACEFUL). This happens pretty
* rapidly... and for each one that exits we'll start a new one until
* we reach at least daemons_min_free. But we may be permitted to
* start more than that, so we'll just keep track of how many we're
* supposed to start up without the 1 second penalty between each fork.
*/
remaining_children_to_start = ap_daemons_to_start;
if (remaining_children_to_start > ap_daemons_limit) {
remaining_children_to_start = ap_daemons_limit;
}
if (!is_graceful) {
startup_children(remaining_children_to_start);
remaining_children_to_start = 0;
}
else {
/* give the system some time to recover before kicking into
* exponential mode */
hold_off_on_exponential_spawning = 10;
}
ap_log_error(APLOG_MARK, APLOG_NOTICE, 0, ap_server_conf,
"%s configured -- resuming normal operations",
ap_get_server_version());
ap_log_error(APLOG_MARK, APLOG_INFO, 0, ap_server_conf,
"Server built: %s", ap_get_server_built());
#ifdef AP_MPM_WANT_SET_ACCEPT_LOCK_MECH
ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, ap_server_conf,
"AcceptMutex: %s (default: %s)",
apr_proc_mutex_name(accept_mutex),
apr_proc_mutex_defname());
#endif
restart_pending = shutdown_pending = 0;
mpm_state = AP_MPMQ_RUNNING;
while (!restart_pending && !shutdown_pending) {
int child_slot;
apr_exit_why_e exitwhy;
int status, processed_status;
/* this is a memory leak, but I'll fix it later. */
apr_proc_t pid;
ap_wait_or_timeout(&exitwhy, &status, &pid, pconf);
/* XXX: if it takes longer than 1 second for all our children
* to start up and get into IDLE state then we may spawn an
* extra child
*/
if (pid.pid != -1) {
processed_status = ap_process_child_status(&pid, exitwhy, status);
if (processed_status == APEXIT_CHILDFATAL) {
mpm_state = AP_MPMQ_STOPPING;
return 1;
}
/* non-fatal death... note that it's gone in the scoreboard. */
child_slot = find_child_by_pid(&pid);
if (child_slot >= 0) {
(void) ap_update_child_status_from_indexes(child_slot, 0, SERVER_DEAD,
(request_rec *) NULL);
if (processed_status == APEXIT_CHILDSICK) {
/* child detected a resource shortage (E[NM]FILE, ENOBUFS, etc)
* cut the fork rate to the minimum
*/
idle_spawn_rate = 1;
}
else if (remaining_children_to_start
&& child_slot < ap_daemons_limit) {
/* we're still doing a 1-for-1 replacement of dead
* children with new children
*/
make_child(ap_server_conf, child_slot);
--remaining_children_to_start;
}
#if APR_HAS_OTHER_CHILD
}
else if (apr_proc_other_child_read(&pid, status) == 0) {
/* handled */
#endif
}
else if (is_graceful) {
/* Great, we've probably just lost a slot in the
* scoreboard. Somehow we don't know about this
* child.
*/
ap_log_error(APLOG_MARK, APLOG_WARNING,
0, ap_server_conf,
"long lost child came home! (pid %ld)", (long)pid.pid);
}
/* Don't perform idle maintenance when a child dies,
* only do it when there's a timeout. Remember only a
* finite number of children can die, and it's pretty
* pathological for a lot to die suddenly.
*/
continue;
}
else if (remaining_children_to_start) {
/* we hit a 1 second timeout in which none of the previous
* generation of children needed to be reaped... so assume
* they're all done, and pick up the slack if any is left.
*/
startup_children(remaining_children_to_start);
remaining_children_to_start = 0;
/* In any event we really shouldn't do the code below because
* few of the servers we just started are in the IDLE state
* yet, so we'd mistakenly create an extra server.
*/
continue;
}
perform_idle_server_maintenance(pconf);
#ifdef TPF
shutdown_pending = os_check_server(tpf_server_name);
ap_check_signals();
sleep(1);
#endif /*TPF */
}
mpm_state = AP_MPMQ_STOPPING;
if (shutdown_pending) {
/* Time to gracefully shut down:
* Kill child processes, tell them to call child_exit, etc...
*/
if (unixd_killpg(getpgrp(), SIGTERM) < 0) {
ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, "killpg SIGTERM");
}
ap_reclaim_child_processes(1); /* Start with SIGTERM */
/* cleanup pid file on normal shutdown */
{
const char *pidfile = NULL;
pidfile = ap_server_root_relative (pconf, ap_pid_fname);
if ( pidfile != NULL && unlink(pidfile) == 0)
ap_log_error(APLOG_MARK, APLOG_INFO,
0, ap_server_conf,
"removed PID file %s (pid=%ld)",
pidfile, (long)getpid());
}
ap_log_error(APLOG_MARK, APLOG_NOTICE, 0, ap_server_conf,
"caught SIGTERM, shutting down");
return 1;
}
/* we've been told to restart */
apr_signal(SIGHUP, SIG_IGN);
if (one_process) {
/* not worth thinking about */
return 1;
}
/* advance to the next generation */
/* XXX: we really need to make sure this new generation number isn't in
* use by any of the children.
*/
++ap_my_generation;
ap_scoreboard_image->global->running_generation = ap_my_generation;
if (is_graceful) {
ap_log_error(APLOG_MARK, APLOG_NOTICE, 0, ap_server_conf,
"Graceful restart requested, doing restart");
/* kill off the idle ones */
ap_mpm_pod_killpg(pod, ap_max_daemons_limit);
/* This is mostly for debugging... so that we know what is still
* gracefully dealing with existing request. This will break
* in a very nasty way if we ever have the scoreboard totally
* file-based (no shared memory)
*/
for (index = 0; index < ap_daemons_limit; ++index) {
if (ap_scoreboard_image->servers[index][0].status != SERVER_DEAD) {
ap_scoreboard_image->servers[index][0].status = SERVER_GRACEFUL;
}
}
}
else {
/* Kill 'em off */
if (unixd_killpg(getpgrp(), SIGHUP) < 0) {
ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, "killpg SIGHUP");
}
ap_reclaim_child_processes(0); /* Not when just starting up */
ap_log_error(APLOG_MARK, APLOG_NOTICE, 0, ap_server_conf,
"SIGHUP received. Attempting to restart");
}
return 0;
}
/* This really should be a post_config hook, but the error log is already
* redirected by that point, so we need to do this in the open_logs phase.
*/
static int prefork_open_logs(apr_pool_t *p, apr_pool_t *plog, apr_pool_t *ptemp, server_rec *s)
{
apr_status_t rv;
pconf = p;
ap_server_conf = s;
if ((num_listensocks = ap_setup_listeners(ap_server_conf)) < 1) {
ap_log_error(APLOG_MARK, APLOG_ALERT|APLOG_STARTUP, 0,
NULL, "no listening sockets available, shutting down");
return DONE;
}
if ((rv = ap_mpm_pod_open(pconf, &pod))) {
ap_log_error(APLOG_MARK, APLOG_CRIT|APLOG_STARTUP, rv, NULL,
"Could not open pipe-of-death.");
return DONE;
}
return OK;
}
/* Main processing of the parent process
* returns TRUE if restarting
*/
static char master_main()
{
server_rec *s = ap_server_conf;
ap_listen_rec *lr;
parent_info_t *parent_info;
char *listener_shm_name;
int listener_num, num_listeners, slot;
ULONG rc;
printf("%s \n", ap_get_server_version());
set_signals();
if (ap_setup_listeners(ap_server_conf) < 1) {
ap_log_error(APLOG_MARK, APLOG_ALERT, 0, s,
"no listening sockets available, shutting down");
return FALSE;
}
/* Allocate a shared memory block for the array of listeners */
for (num_listeners = 0, lr = ap_listeners; lr; lr = lr->next) {
num_listeners++;
}
listener_shm_name = apr_psprintf(pconf, "/sharemem/httpd/parent_info.%d", getpid());
rc = DosAllocSharedMem((PPVOID)&parent_info, listener_shm_name,
sizeof(parent_info_t) + num_listeners * sizeof(listen_socket_t),
PAG_READ|PAG_WRITE|PAG_COMMIT);
if (rc) {
ap_log_error(APLOG_MARK, APLOG_ALERT, APR_FROM_OS_ERROR(rc), s,
"failure allocating shared memory, shutting down");
return FALSE;
}
/* Store the listener sockets in the shared memory area for our children to see */
for (listener_num = 0, lr = ap_listeners; lr; lr = lr->next, listener_num++) {
apr_os_sock_get(&parent_info->listeners[listener_num].listen_fd, lr->sd);
}
/* Create mutex to prevent multiple child processes from detecting
* a connection with apr_poll()
*/
rc = DosCreateMutexSem(NULL, &ap_mpm_accept_mutex, DC_SEM_SHARED, FALSE);
if (rc) {
ap_log_error(APLOG_MARK, APLOG_ALERT, APR_FROM_OS_ERROR(rc), s,
"failure creating accept mutex, shutting down");
return FALSE;
}
parent_info->accept_mutex = ap_mpm_accept_mutex;
/* Allocate shared memory for scoreboard */
if (ap_scoreboard_image == NULL) {
void *sb_mem;
rc = DosAllocSharedMem(&sb_mem, ap_scoreboard_fname,
ap_calc_scoreboard_size(),
PAG_COMMIT|PAG_READ|PAG_WRITE);
if (rc) {
ap_log_error(APLOG_MARK, APLOG_ERR, APR_FROM_OS_ERROR(rc), ap_server_conf,
"unable to allocate shared memory for scoreboard , exiting");
return FALSE;
}
ap_init_scoreboard(sb_mem);
}
ap_scoreboard_image->global->restart_time = apr_time_now();
ap_log_error(APLOG_MARK, APLOG_NOTICE, 0, ap_server_conf,
"%s configured -- resuming normal operations",
ap_get_server_version());
ap_log_error(APLOG_MARK, APLOG_INFO, 0, ap_server_conf,
"Server built: %s", ap_get_server_built());
#ifdef AP_MPM_WANT_SET_ACCEPT_LOCK_MECH
ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, ap_server_conf,
"AcceptMutex: %s (default: %s)",
apr_proc_mutex_name(accept_mutex),
apr_proc_mutex_defname());
#endif
if (one_process) {
ap_scoreboard_image->parent[0].pid = getpid();
ap_mpm_child_main(pconf);
return FALSE;
}
while (!restart_pending && !shutdown_pending) {
RESULTCODES proc_rc;
PID child_pid;
int active_children = 0;
/* Count number of active children */
for (slot=0; slot < HARD_SERVER_LIMIT; slot++) {
active_children += ap_scoreboard_image->parent[slot].pid != 0 &&
!ap_scoreboard_image->parent[slot].quiescing;
}
/* Spawn children if needed */
for (slot=0; slot < HARD_SERVER_LIMIT && active_children < ap_daemons_to_start; slot++) {
if (ap_scoreboard_image->parent[slot].pid == 0) {
spawn_child(slot);
active_children++;
}
}
rc = DosWaitChild(DCWA_PROCESSTREE, DCWW_NOWAIT, &proc_rc, &child_pid, 0);
if (rc == 0) {
/* A child has terminated, remove its scoreboard entry & terminate if necessary */
for (slot=0; ap_scoreboard_image->parent[slot].pid != child_pid && slot < HARD_SERVER_LIMIT; slot++);
if (slot < HARD_SERVER_LIMIT) {
ap_scoreboard_image->parent[slot].pid = 0;
ap_scoreboard_image->parent[slot].quiescing = 0;
if (proc_rc.codeTerminate == TC_EXIT) {
/* Child terminated normally, check its exit code and
* terminate server if child indicates a fatal error
*/
if (proc_rc.codeResult == APEXIT_CHILDFATAL)
break;
}
}
} else if (rc == ERROR_CHILD_NOT_COMPLETE) {
/* No child exited, lets sleep for a while.... */
apr_sleep(SCOREBOARD_MAINTENANCE_INTERVAL);
}
}
/* Signal children to shut down, either gracefully or immediately */
for (slot=0; slot<HARD_SERVER_LIMIT; slot++) {
kill(ap_scoreboard_image->parent[slot].pid, is_graceful ? SIGHUP : SIGTERM);
}
DosFreeMem(parent_info);
return restart_pending;
}
int ap_mpm_run(apr_pool_t *_pconf, apr_pool_t *plog, server_rec *s)
{
apr_status_t status=0;
pconf = _pconf;
ap_server_conf = s;
if (setup_listeners(s)) {
ap_log_error(APLOG_MARK, APLOG_ALERT, status, s,
"no listening sockets available, shutting down");
return -1;
}
restart_pending = shutdown_pending = 0;
worker_thread_count = 0;
if (!is_graceful) {
if (ap_run_pre_mpm(s->process->pool, SB_NOT_SHARED) != OK) {
return 1;
}
}
/* Only set slot 0 since that is all NetWare will ever have. */
ap_scoreboard_image->parent[0].pid = getpid();
set_signals();
apr_pool_create(&pmain, pconf);
ap_run_child_init(pmain, ap_server_conf);
if (ap_threads_max_free < ap_threads_min_free + 1) /* Don't thrash... */
ap_threads_max_free = ap_threads_min_free + 1;
request_count = 0;
startup_workers(ap_threads_to_start);
/* Allow the Apache screen to be closed normally on exit() only if it
has not been explicitly forced to close on exit(). (ie. the -E flag
was specified at startup) */
if (hold_screen_on_exit > 0) {
hold_screen_on_exit = 0;
}
ap_log_error(APLOG_MARK, APLOG_NOTICE, 0, ap_server_conf,
"%s configured -- resuming normal operations",
ap_get_server_description());
ap_log_error(APLOG_MARK, APLOG_INFO, 0, ap_server_conf,
"Server built: %s", ap_get_server_built());
#ifdef AP_MPM_WANT_SET_ACCEPT_LOCK_MECH
ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, ap_server_conf,
"AcceptMutex: %s (default: %s)",
apr_proc_mutex_name(accept_mutex),
apr_proc_mutex_defname());
#endif
show_server_data();
mpm_state = AP_MPMQ_RUNNING;
while (!restart_pending && !shutdown_pending) {
perform_idle_server_maintenance(pconf);
if (show_settings)
display_settings();
apr_thread_yield();
apr_sleep(SCOREBOARD_MAINTENANCE_INTERVAL);
}
mpm_state = AP_MPMQ_STOPPING;
/* Shutdown the listen sockets so that we don't get stuck in a blocking call.
shutdown_listeners();*/
if (shutdown_pending) { /* Got an unload from the console */
ap_log_error(APLOG_MARK, APLOG_NOTICE, 0, ap_server_conf,
"caught SIGTERM, shutting down");
while (worker_thread_count > 0) {
printf ("\rShutdown pending. Waiting for %d thread(s) to terminate...",
worker_thread_count);
apr_thread_yield();
}
mpm_main_cleanup();
return 1;
}
else { /* the only other way out is a restart */
/* advance to the next generation */
/* XXX: we really need to make sure this new generation number isn't in
* use by any of the children.
*/
++ap_my_generation;
ap_scoreboard_image->global->running_generation = ap_my_generation;
ap_log_error(APLOG_MARK, APLOG_NOTICE, 0, ap_server_conf,
"Graceful restart requested, doing restart");
/* Wait for all of the threads to terminate before initiating the restart */
while (worker_thread_count > 0) {
printf ("\rRestart pending. Waiting for %d thread(s) to terminate...",
worker_thread_count);
apr_thread_yield();
}
printf ("\nRestarting...\n");
}
mpm_main_cleanup();
return 0;
}
