#include "apr.h"
#include "apr_portable.h"
#include "apr_strings.h"
#include "apr_thread_proc.h"
#include "apr_signal.h"
#define APR_WANT_STDIO
#define APR_WANT_STRFUNC
#include "apr_want.h"
#if APR_HAVE_UNISTD_H
#include <unistd.h>
#endif
#if APR_HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#define CORE_PRIVATE
#include "ap_config.h"
#include "httpd.h"
#include "mpm_default.h"
#include "http_main.h"
#include "http_log.h"
#include "http_config.h"
#include "http_core.h"
#include "http_connection.h"
#include "scoreboard.h"
#include "ap_mpm.h"
#include "unixd.h"
#include "mpm_common.h"
#include "ap_listen.h"
#include "ap_mmn.h"
#include "apr_poll.h"
#ifdef HAVE_BSTRING_H
#include <bstring.h>
#endif
#ifdef HAVE_TIME_H
#include <time.h>
#endif
#ifdef HAVE_SYS_PROCESSOR_H
#include <sys/processor.h>
#endif
#include <signal.h>
#include <sys/times.h>
#ifndef DEFAULT_SERVER_LIMIT
#define DEFAULT_SERVER_LIMIT 256
#endif
#ifndef MAX_SERVER_LIMIT
#define MAX_SERVER_LIMIT 200000
#endif
#ifndef HARD_THREAD_LIMIT
#define HARD_THREAD_LIMIT 1
#endif
int ap_threads_per_child=0;
static apr_proc_mutex_t *accept_mutex;
static int ap_daemons_to_start=0;
static int ap_daemons_min_free=0;
static int ap_daemons_max_free=0;
static int ap_daemons_limit=0;
static int server_limit = DEFAULT_SERVER_LIMIT;
static int first_server_limit = 0;
static int changed_limit_at_restart;
static int mpm_state = AP_MPMQ_STARTING;
static ap_pod_t *pod;
int ap_max_daemons_limit = -1;
server_rec *ap_server_conf;
static int one_process = 0;
static apr_pool_t *pconf;
static apr_pool_t *pchild;
static pid_t ap_my_pid;
static pid_t parent_pid;
#ifndef MULTITHREAD
static int my_child_num;
#endif
ap_generation_t volatile ap_my_generation=0;
#ifdef TPF
int tpf_child = 0;
char tpf_server_name[INETD_SERVNAME_LENGTH+1];
#endif
static volatile int die_now = 0;
#ifdef GPROF
static void chdir_for_gprof(void)
{
core_server_config *sconf =
ap_get_module_config(ap_server_conf->module_config, &core_module);
char *dir = sconf->gprof_dir;
const char *use_dir;
if(dir) {
apr_status_t res;
char *buf = NULL ;
int len = strlen(sconf->gprof_dir) - 1;
if(*(dir + len) == '%') {
dir[len] = '\0';
buf = ap_append_pid(pconf, dir, "gprof.");
}
use_dir = ap_server_root_relative(pconf, buf ? buf : dir);
res = apr_dir_make(use_dir,
APR_UREAD | APR_UWRITE | APR_UEXECUTE |
APR_GREAD | APR_GEXECUTE |
APR_WREAD | APR_WEXECUTE, pconf);
if(res != APR_SUCCESS && !APR_STATUS_IS_EEXIST(res)) {
ap_log_error(APLOG_MARK, APLOG_ERR, res, ap_server_conf,
"gprof: error creating directory %s", dir);
}
}
else {
use_dir = ap_server_root_relative(pconf, DEFAULT_REL_RUNTIMEDIR);
}
chdir(use_dir);
}
#else
#define chdir_for_gprof()
#endif
#define ap_check_signals()
static void clean_child_exit(int code) __attribute__ ((noreturn));
static void clean_child_exit(int code)
{
mpm_state = AP_MPMQ_STOPPING;
if (pchild) {
apr_pool_destroy(pchild);
}
ap_mpm_pod_close(pod);
chdir_for_gprof();
exit(code);
}
static void accept_mutex_on(void)
{
apr_status_t rv = apr_proc_mutex_lock(accept_mutex);
if (rv != APR_SUCCESS) {
const char *msg = "couldn't grab the accept mutex";
if (ap_my_generation !=
ap_scoreboard_image->global->running_generation) {
ap_log_error(APLOG_MARK, APLOG_DEBUG, rv, NULL, "%s", msg);
clean_child_exit(0);
}
else {
ap_log_error(APLOG_MARK, APLOG_EMERG, rv, NULL, "%s", msg);
exit(APEXIT_CHILDFATAL);
}
}
}
static void accept_mutex_off(void)
{
apr_status_t rv = apr_proc_mutex_unlock(accept_mutex);
if (rv != APR_SUCCESS) {
const char *msg = "couldn't release the accept mutex";
if (ap_my_generation !=
ap_scoreboard_image->global->running_generation) {
ap_log_error(APLOG_MARK, APLOG_DEBUG, rv, NULL, "%s", msg);
}
else {
ap_log_error(APLOG_MARK, APLOG_EMERG, rv, NULL, "%s", msg);
exit(APEXIT_CHILDFATAL);
}
}
}
#ifdef SINGLE_LISTEN_UNSERIALIZED_ACCEPT
#define SAFE_ACCEPT(stmt) do {if (ap_listeners->next) {stmt;}} while(0)
#else
#define SAFE_ACCEPT(stmt) do {stmt;} while(0)
#endif
AP_DECLARE(apr_status_t) ap_mpm_query(int query_code, int *result)
{
switch(query_code){
case AP_MPMQ_MAX_DAEMON_USED:
*result = ap_daemons_limit;
return APR_SUCCESS;
case AP_MPMQ_IS_THREADED:
*result = AP_MPMQ_NOT_SUPPORTED;
return APR_SUCCESS;
case AP_MPMQ_IS_FORKED:
*result = AP_MPMQ_DYNAMIC;
return APR_SUCCESS;
case AP_MPMQ_HARD_LIMIT_DAEMONS:
*result = server_limit;
return APR_SUCCESS;
case AP_MPMQ_HARD_LIMIT_THREADS:
*result = HARD_THREAD_LIMIT;
return APR_SUCCESS;
case AP_MPMQ_MAX_THREADS:
*result = 0;
return APR_SUCCESS;
case AP_MPMQ_MIN_SPARE_DAEMONS:
*result = ap_daemons_min_free;
return APR_SUCCESS;
case AP_MPMQ_MIN_SPARE_THREADS:
*result = 0;
return APR_SUCCESS;
case AP_MPMQ_MAX_SPARE_DAEMONS:
*result = ap_daemons_max_free;
return APR_SUCCESS;
case AP_MPMQ_MAX_SPARE_THREADS:
*result = 0;
return APR_SUCCESS;
case AP_MPMQ_MAX_REQUESTS_DAEMON:
*result = ap_max_requests_per_child;
return APR_SUCCESS;
case AP_MPMQ_MAX_DAEMONS:
*result = server_limit;
return APR_SUCCESS;
case AP_MPMQ_MPM_STATE:
*result = mpm_state;
return APR_SUCCESS;
}
return APR_ENOTIMPL;
}
#if defined(NEED_WAITPID)
int reap_children(int *exitcode, apr_exit_why_e *status)
{
int n, pid;
for (n = 0; n < ap_max_daemons_limit; ++n) {
if (ap_scoreboard_image->servers[n][0].status != SERVER_DEAD &&
kill((pid = ap_scoreboard_image->parent[n].pid), 0) == -1) {
ap_update_child_status_from_indexes(n, 0, SERVER_DEAD, NULL);
*status = APR_PROC_EXIT;
*exitcode = 0;
return(pid);
}
}
return 0;
}
#endif
static void just_die(int sig)
{
clean_child_exit(0);
}
static void stop_listening(int sig)
{
mpm_state = AP_MPMQ_STOPPING;
ap_close_listeners();
die_now = 1;
}
static int volatile shutdown_pending;
static int volatile restart_pending;
static int volatile is_graceful;
static void sig_term(int sig)
{
if (shutdown_pending == 1) {
return;
}
mpm_state = AP_MPMQ_STOPPING;
shutdown_pending = 1;
is_graceful = (sig == AP_SIG_GRACEFUL_STOP);
}
static void restart(int sig)
{
if (restart_pending == 1) {
return;
}
mpm_state = AP_MPMQ_STOPPING;
restart_pending = 1;
is_graceful = (sig == AP_SIG_GRACEFUL);
}
static void set_signals(void)
{
#ifndef NO_USE_SIGACTION
struct sigaction sa;
#endif
if (!one_process) {
ap_fatal_signal_setup(ap_server_conf, pconf);
}
#ifndef NO_USE_SIGACTION
sigemptyset(&sa.sa_mask);
sa.sa_flags = 0;
sa.sa_handler = sig_term;
if (sigaction(SIGTERM, &sa, NULL) < 0)
ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, "sigaction(SIGTERM)");
#ifdef AP_SIG_GRACEFUL_STOP
if (sigaction(AP_SIG_GRACEFUL_STOP, &sa, NULL) < 0)
ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf,
"sigaction(" AP_SIG_GRACEFUL_STOP_STRING ")");
#endif
#ifdef SIGINT
if (sigaction(SIGINT, &sa, NULL) < 0)
ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, "sigaction(SIGINT)");
#endif
#ifdef SIGXCPU
sa.sa_handler = SIG_DFL;
if (sigaction(SIGXCPU, &sa, NULL) < 0)
ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, "sigaction(SIGXCPU)");
#endif
#ifdef SIGXFSZ
sa.sa_handler = SIG_DFL;
if (sigaction(SIGXFSZ, &sa, NULL) < 0)
ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, "sigaction(SIGXFSZ)");
#endif
#ifdef SIGPIPE
sa.sa_handler = SIG_IGN;
if (sigaction(SIGPIPE, &sa, NULL) < 0)
ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, "sigaction(SIGPIPE)");
#endif
sigaddset(&sa.sa_mask, SIGHUP);
sigaddset(&sa.sa_mask, AP_SIG_GRACEFUL);
sa.sa_handler = restart;
if (sigaction(SIGHUP, &sa, NULL) < 0)
ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, "sigaction(SIGHUP)");
if (sigaction(AP_SIG_GRACEFUL, &sa, NULL) < 0)
ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, "sigaction(" AP_SIG_GRACEFUL_STRING ")");
#else
if (!one_process) {
#ifdef SIGXCPU
apr_signal(SIGXCPU, SIG_DFL);
#endif
#ifdef SIGXFSZ
apr_signal(SIGXFSZ, SIG_DFL);
#endif
}
apr_signal(SIGTERM, sig_term);
#ifdef SIGHUP
apr_signal(SIGHUP, restart);
#endif
#ifdef AP_SIG_GRACEFUL
apr_signal(AP_SIG_GRACEFUL, restart);
#endif
#ifdef AP_SIG_GRACEFUL_STOP
apr_signal(AP_SIG_GRACEFUL_STOP, sig_term);
#endif
#ifdef SIGPIPE
apr_signal(SIGPIPE, SIG_IGN);
#endif
#endif
}
static int requests_this_child;
static int num_listensocks = 0;
int ap_graceful_stop_signalled(void)
{
return mpm_state == AP_MPMQ_STOPPING;
}
static void child_main(int child_num_arg)
{
apr_pool_t *ptrans;
apr_allocator_t *allocator;
apr_status_t status;
int i;
ap_listen_rec *lr;
apr_pollset_t *pollset;
ap_sb_handle_t *sbh;
apr_bucket_alloc_t *bucket_alloc;
int last_poll_idx = 0;
mpm_state = AP_MPMQ_STARTING;
my_child_num = child_num_arg;
ap_my_pid = getpid();
requests_this_child = 0;
ap_fatal_signal_child_setup(ap_server_conf);
apr_allocator_create(&allocator);
apr_allocator_max_free_set(allocator, ap_max_mem_free);
apr_pool_create_ex(&pchild, pconf, NULL, allocator);
apr_allocator_owner_set(allocator, pchild);
apr_pool_create(&ptrans, pchild);
apr_pool_tag(ptrans, "transaction");
ap_reopen_scoreboard(pchild, NULL, 0);
status = apr_proc_mutex_child_init(&accept_mutex, ap_lock_fname, pchild);
if (status != APR_SUCCESS) {
ap_log_error(APLOG_MARK, APLOG_EMERG, status, ap_server_conf,
"Couldn't initialize cross-process lock in child "
"(%s) (%d)", ap_lock_fname, ap_accept_lock_mech);
clean_child_exit(APEXIT_CHILDFATAL);
}
if (unixd_setup_child()) {
clean_child_exit(APEXIT_CHILDFATAL);
}
ap_run_child_init(pchild, ap_server_conf);
ap_create_sb_handle(&sbh, pchild, my_child_num, 0);
(void) ap_update_child_status(sbh, SERVER_READY, (request_rec *) NULL);
status = apr_pollset_create(&pollset, num_listensocks, pchild, 0);
if (status != APR_SUCCESS) {
ap_log_error(APLOG_MARK, APLOG_EMERG, status, ap_server_conf,
"Couldn't create pollset in child; check system or user limits");
clean_child_exit(APEXIT_CHILDSICK);
}
for (lr = ap_listeners, i = num_listensocks; i--; lr = lr->next) {
apr_pollfd_t pfd = { 0 };
pfd.desc_type = APR_POLL_SOCKET;
pfd.desc.s = lr->sd;
pfd.reqevents = APR_POLLIN;
pfd.client_data = lr;
(void) apr_pollset_add(pollset, &pfd);
}
mpm_state = AP_MPMQ_RUNNING;
bucket_alloc = apr_bucket_alloc_create(pchild);
while (!die_now && !shutdown_pending) {
conn_rec *current_conn;
void *csd;
apr_pool_clear(ptrans);
if ((ap_max_requests_per_child > 0
&& requests_this_child++ >= ap_max_requests_per_child)) {
clean_child_exit(0);
}
(void) ap_update_child_status(sbh, SERVER_READY, (request_rec *) NULL);
SAFE_ACCEPT(accept_mutex_on());
if (num_listensocks == 1) {
lr = ap_listeners;
}
else {
for (;;) {
apr_int32_t numdesc;
const apr_pollfd_t *pdesc;
if (one_process && shutdown_pending) {
SAFE_ACCEPT(accept_mutex_off());
return;
}
else if (die_now) {
SAFE_ACCEPT(accept_mutex_off());
clean_child_exit(0);
}
status = apr_pollset_poll(pollset, apr_time_from_sec(10),
&numdesc, &pdesc);
if (status != APR_SUCCESS) {
if (APR_STATUS_IS_TIMEUP(status) ||
APR_STATUS_IS_EINTR(status)) {
continue;
}
ap_log_error(APLOG_MARK, APLOG_ERR, status,
ap_server_conf, "apr_pollset_poll: (listen)");
SAFE_ACCEPT(accept_mutex_off());
clean_child_exit(1);
}
if (last_poll_idx >= numdesc)
last_poll_idx = 0;
lr = pdesc[last_poll_idx++].client_data;
goto got_fd;
}
}
got_fd:
status = lr->accept_func(&csd, lr, ptrans);
SAFE_ACCEPT(accept_mutex_off());
if (status == APR_EGENERAL) {
clean_child_exit(1);
}
else if (status != APR_SUCCESS) {
continue;
}
current_conn = ap_run_create_connection(ptrans, ap_server_conf, csd, my_child_num, sbh, bucket_alloc);
if (current_conn) {
ap_process_connection(current_conn, csd);
ap_lingering_close(current_conn);
}
if (ap_mpm_pod_check(pod) == APR_SUCCESS) {
die_now = 1;
}
else if (ap_my_generation !=
ap_scoreboard_image->global->running_generation) {
die_now = 1;
}
}
apr_pool_clear(ptrans);
clean_child_exit(0);
}
static int make_child(server_rec *s, int slot)
{
int pid;
if (slot + 1 > ap_max_daemons_limit) {
ap_max_daemons_limit = slot + 1;
}
if (one_process) {
apr_signal(SIGHUP, sig_term);
apr_signal(SIGINT, sig_term);
#ifdef SIGQUIT
apr_signal(SIGQUIT, SIG_DFL);
#endif
apr_signal(SIGTERM, sig_term);
child_main(slot);
return 0;
}
(void) ap_update_child_status_from_indexes(slot, 0, SERVER_STARTING,
(request_rec *) NULL);
#ifdef _OSD_POSIX
if ((pid = os_fork(unixd_config.user_name)) == -1) {
#elif defined(TPF)
if ((pid = os_fork(s, slot)) == -1) {
#else
if ((pid = fork()) == -1) {
#endif
ap_log_error(APLOG_MARK, APLOG_ERR, errno, s, "fork: Unable to fork new process");
(void) ap_update_child_status_from_indexes(slot, 0, SERVER_DEAD,
(request_rec *) NULL);
sleep(10);
return -1;
}
if (!pid) {
#ifdef HAVE_BINDPROCESSOR
int status = bindprocessor(BINDPROCESS, (int)getpid(),
PROCESSOR_CLASS_ANY);
if (status != OK) {
ap_log_error(APLOG_MARK, APLOG_WARNING, errno,
ap_server_conf, "processor unbind failed %d", status);
}
#endif
RAISE_SIGSTOP(MAKE_CHILD);
AP_MONCONTROL(1);
apr_signal(SIGHUP, just_die);
apr_signal(SIGTERM, just_die);
apr_signal(AP_SIG_GRACEFUL, stop_listening);
child_main(slot);
}
ap_scoreboard_image->parent[slot].pid = pid;
return 0;
}
static void startup_children(int number_to_start)
{
int i;
for (i = 0; number_to_start && i < ap_daemons_limit; ++i) {
if (ap_scoreboard_image->servers[i][0].status != SERVER_DEAD) {
continue;
}
if (make_child(ap_server_conf, i) < 0) {
break;
}
--number_to_start;
}
}
static int idle_spawn_rate = 1;
#ifndef MAX_SPAWN_RATE
#define MAX_SPAWN_RATE (32)
#endif
static int hold_off_on_exponential_spawning;
static void perform_idle_server_maintenance(apr_pool_t *p)
{
int i;
int to_kill;
int idle_count;
worker_score *ws;
int free_length;
int free_slots[MAX_SPAWN_RATE];
int last_non_dead;
int total_non_dead;
free_length = 0;
to_kill = -1;
idle_count = 0;
last_non_dead = -1;
total_non_dead = 0;
for (i = 0; i < ap_daemons_limit; ++i) {
int status;
if (i >= ap_max_daemons_limit && free_length == idle_spawn_rate)
break;
ws = &ap_scoreboard_image->servers[i][0];
status = ws->status;
if (status == SERVER_DEAD) {
if (free_length < idle_spawn_rate) {
free_slots[free_length] = i;
++free_length;
}
}
else {
if (status <= SERVER_READY) {
++ idle_count;
to_kill = i;
}
++total_non_dead;
last_non_dead = i;
}
}
ap_max_daemons_limit = last_non_dead + 1;
if (idle_count > ap_daemons_max_free) {
ap_mpm_pod_signal(pod);
idle_spawn_rate = 1;
}
else if (idle_count < ap_daemons_min_free) {
if (free_length == 0) {
static int reported = 0;
if (!reported) {
ap_log_error(APLOG_MARK, APLOG_ERR, 0, ap_server_conf,
"server reached MaxClients setting, consider"
" raising the MaxClients setting");
reported = 1;
}
idle_spawn_rate = 1;
}
else {
if (idle_spawn_rate >= 8) {
ap_log_error(APLOG_MARK, APLOG_INFO, 0, ap_server_conf,
"server seems busy, (you may need "
"to increase StartServers, or Min/MaxSpareServers), "
"spawning %d children, there are %d idle, and "
"%d total children", idle_spawn_rate,
idle_count, total_non_dead);
}
for (i = 0; i < free_length; ++i) {
#ifdef TPF
if (make_child(ap_server_conf, free_slots[i]) == -1) {
if(free_length == 1) {
shutdown_pending = 1;
ap_log_error(APLOG_MARK, APLOG_EMERG, 0, ap_server_conf,
"No active child processes: shutting down");
}
}
#else
make_child(ap_server_conf, free_slots[i]);
#endif
}
if (hold_off_on_exponential_spawning) {
--hold_off_on_exponential_spawning;
}
else if (idle_spawn_rate < MAX_SPAWN_RATE) {
idle_spawn_rate *= 2;
}
}
}
else {
idle_spawn_rate = 1;
}
}
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;
}
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 (%s) (%d)",
ap_lock_fname, ap_accept_lock_mech);
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;
}
ap_scoreboard_image->global->running_generation = ap_my_generation;
}
set_signals();
if (one_process) {
AP_MONCONTROL(1);
make_child(ap_server_conf, 0);
}
else {
if (ap_daemons_max_free < ap_daemons_min_free + 1)
ap_daemons_max_free = ap_daemons_min_free + 1;
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 {
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_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
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;
apr_proc_t pid;
ap_wait_or_timeout(&exitwhy, &status, &pid, pconf);
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;
}
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) {
idle_spawn_rate = 1;
}
else if (remaining_children_to_start
&& child_slot < ap_daemons_limit) {
make_child(ap_server_conf, child_slot);
--remaining_children_to_start;
}
#if APR_HAS_OTHER_CHILD
}
else if (apr_proc_other_child_alert(&pid, APR_OC_REASON_DEATH, status) == APR_SUCCESS) {
#endif
}
else if (is_graceful) {
ap_log_error(APLOG_MARK, APLOG_WARNING,
0, ap_server_conf,
"long lost child came home! (pid %ld)", (long)pid.pid);
}
continue;
}
else if (remaining_children_to_start) {
startup_children(remaining_children_to_start);
remaining_children_to_start = 0;
continue;
}
perform_idle_server_maintenance(pconf);
#ifdef TPF
shutdown_pending = os_check_server(tpf_server_name);
ap_check_signals();
sleep(1);
#endif
}
}
mpm_state = AP_MPMQ_STOPPING;
if (shutdown_pending && !is_graceful) {
if (unixd_killpg(getpgrp(), SIGTERM) < 0) {
ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, "killpg SIGTERM");
}
ap_reclaim_child_processes(1);
{
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;
} else if (shutdown_pending) {
int active_children;
apr_time_t cutoff = 0;
ap_close_listeners();
ap_mpm_pod_killpg(pod, ap_max_daemons_limit);
active_children = 0;
for (index = 0; index < ap_daemons_limit; ++index) {
if (ap_scoreboard_image->servers[index][0].status != SERVER_DEAD) {
ap_mpm_safe_kill(MPM_CHILD_PID(index), AP_SIG_GRACEFUL);
active_children++;
}
}
ap_relieve_child_processes();
{
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 " AP_SIG_GRACEFUL_STOP_STRING ", shutting down gracefully");
if (ap_graceful_shutdown_timeout) {
cutoff = apr_time_now() +
apr_time_from_sec(ap_graceful_shutdown_timeout);
}
shutdown_pending = 0;
do {
sleep(1);
ap_relieve_child_processes();
active_children = 0;
for (index = 0; index < ap_daemons_limit; ++index) {
if (ap_mpm_safe_kill(MPM_CHILD_PID(index), 0) == APR_SUCCESS) {
active_children = 1;
break;
}
}
} while (!shutdown_pending && active_children &&
(!ap_graceful_shutdown_timeout || apr_time_now() < cutoff));
unixd_killpg(getpgrp(), SIGTERM);
return 1;
}
apr_signal(SIGHUP, SIG_IGN);
apr_signal(AP_SIG_GRACEFUL, SIG_IGN);
if (one_process) {
return 1;
}
++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");
ap_mpm_pod_killpg(pod, ap_max_daemons_limit);
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;
ap_mpm_safe_kill(ap_scoreboard_image->parent[index].pid, AP_SIG_GRACEFUL);
}
}
}
else {
if (unixd_killpg(getpgrp(), SIGHUP) < 0) {
ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, "killpg SIGHUP");
}
ap_reclaim_child_processes(0);
ap_log_error(APLOG_MARK, APLOG_NOTICE, 0, ap_server_conf,
"SIGHUP received. Attempting to restart");
}
return 0;
}
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;
}
static int prefork_pre_config(apr_pool_t *p, apr_pool_t *plog, apr_pool_t *ptemp)
{
static int restart_num = 0;
int no_detach, debug, foreground;
apr_status_t rv;
mpm_state = AP_MPMQ_STARTING;
debug = ap_exists_config_define("DEBUG");
if (debug) {
foreground = one_process = 1;
no_detach = 0;
}
else
{
no_detach = ap_exists_config_define("NO_DETACH");
one_process = ap_exists_config_define("ONE_PROCESS");
foreground = ap_exists_config_define("FOREGROUND");
}
if (restart_num++ == 1) {
is_graceful = 0;
if (!one_process && !foreground) {
rv = apr_proc_detach(no_detach ? APR_PROC_DETACH_FOREGROUND
: APR_PROC_DETACH_DAEMONIZE);
if (rv != APR_SUCCESS) {
ap_log_error(APLOG_MARK, APLOG_CRIT, rv, NULL,
"apr_proc_detach failed");
return HTTP_INTERNAL_SERVER_ERROR;
}
}
parent_pid = ap_my_pid = getpid();
}
unixd_pre_config(ptemp);
ap_listen_pre_config();
ap_daemons_to_start = DEFAULT_START_DAEMON;
ap_daemons_min_free = DEFAULT_MIN_FREE_DAEMON;
ap_daemons_max_free = DEFAULT_MAX_FREE_DAEMON;
ap_daemons_limit = server_limit;
ap_pid_fname = DEFAULT_PIDLOG;
ap_lock_fname = DEFAULT_LOCKFILE;
ap_max_requests_per_child = DEFAULT_MAX_REQUESTS_PER_CHILD;
ap_extended_status = 0;
#ifdef AP_MPM_WANT_SET_MAX_MEM_FREE
ap_max_mem_free = APR_ALLOCATOR_MAX_FREE_UNLIMITED;
#endif
apr_cpystrn(ap_coredump_dir, ap_server_root, sizeof(ap_coredump_dir));
return OK;
}
static void prefork_hooks(apr_pool_t *p)
{
static const char *const aszSucc[] = {"core.c", NULL};
#ifdef AUX3
(void) set42sig();
#endif
ap_hook_open_logs(prefork_open_logs, NULL, aszSucc, APR_HOOK_MIDDLE);
ap_hook_pre_config(prefork_pre_config, NULL, NULL, APR_HOOK_REALLY_FIRST);
}
static const char *set_daemons_to_start(cmd_parms *cmd, void *dummy, const char *arg)
{
const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
if (err != NULL) {
return err;
}
ap_daemons_to_start = atoi(arg);
return NULL;
}
static const char *set_min_free_servers(cmd_parms *cmd, void *dummy, const char *arg)
{
const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
if (err != NULL) {
return err;
}
ap_daemons_min_free = atoi(arg);
if (ap_daemons_min_free <= 0) {
ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL,
"WARNING: detected MinSpareServers set to non-positive.");
ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL,
"Resetting to 1 to avoid almost certain Apache failure.");
ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL,
"Please read the documentation.");
ap_daemons_min_free = 1;
}
return NULL;
}
static const char *set_max_free_servers(cmd_parms *cmd, void *dummy, const char *arg)
{
const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
if (err != NULL) {
return err;
}
ap_daemons_max_free = atoi(arg);
return NULL;
}
#include <sys/resource.h>
static int getproclimit(void)
{
struct rlimit rl;
memset(&rl, 0, sizeof rl);
return getrlimit(RLIMIT_NPROC, &rl) == 0 ? rl.rlim_cur : 0;
}
static const char *set_max_clients (cmd_parms *cmd, void *dummy, const char *arg)
{
int tmp_daemons_limit;
const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
if (err != NULL) {
return err;
}
tmp_daemons_limit = atoi(arg);
if (strlen(arg) > 0 && arg[strlen(arg) - 1] == '%') {
int proclimit = getproclimit();
if (proclimit <= 0) {
ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL,
"WARNING: MaxClients %d%% ignored because "
"RLIMIT_NPROC is unknown", tmp_daemons_limit);
return NULL;
}
if (tmp_daemons_limit < 1 || tmp_daemons_limit > 100) {
ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL,
"WARNING: MaxClients %d%% ignored because "
"percentage is out of range 1-100%%",
tmp_daemons_limit);
return NULL;
}
tmp_daemons_limit = proclimit * tmp_daemons_limit / 100.0 + 0.5;
}
ap_daemons_limit = tmp_daemons_limit;
if (ap_daemons_limit > server_limit) {
ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL,
"WARNING: MaxClients of %d exceeds ServerLimit value "
"of %d servers,", ap_daemons_limit, server_limit);
ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL,
" lowering MaxClients to %d. To increase, please "
"see the ServerLimit", server_limit);
ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL,
" directive.");
ap_daemons_limit = server_limit;
}
else if (ap_daemons_limit < 1) {
ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL,
"WARNING: Require MaxClients > 0, setting to 1");
ap_daemons_limit = 1;
}
return NULL;
}
static const char *set_server_limit (cmd_parms *cmd, void *dummy, const char *arg)
{
int tmp_server_limit;
const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
if (err != NULL) {
return err;
}
tmp_server_limit = atoi(arg);
if (strlen(arg) > 0 && arg[strlen(arg) - 1] == '%') {
int proclimit = getproclimit();
if (proclimit <= 0) {
ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL,
"WARNING: ServerLimit %d%% ignored because "
"RLIMIT_NPROC is unknown", tmp_server_limit);
return NULL;
}
if (tmp_server_limit < 1 || tmp_server_limit > 100) {
ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL,
"WARNING: ServerLimit %d%% ignored because "
"percentage is out of range 1-100%%",
tmp_server_limit);
return NULL;
}
tmp_server_limit = proclimit * tmp_server_limit / 100.0 + 0.5;
}
if (first_server_limit &&
tmp_server_limit != server_limit) {
changed_limit_at_restart = 1;
return NULL;
}
server_limit = tmp_server_limit;
if (server_limit > MAX_SERVER_LIMIT) {
ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL,
"WARNING: ServerLimit of %d exceeds compile time limit "
"of %d servers,", server_limit, MAX_SERVER_LIMIT);
ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL,
" lowering ServerLimit to %d.", MAX_SERVER_LIMIT);
server_limit = MAX_SERVER_LIMIT;
}
else if (server_limit < 1) {
ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL,
"WARNING: Require ServerLimit > 0, setting to 1");
server_limit = 1;
}
return NULL;
}
static const command_rec prefork_cmds[] = {
UNIX_DAEMON_COMMANDS,
LISTEN_COMMANDS,
AP_INIT_TAKE1("StartServers", set_daemons_to_start, NULL, RSRC_CONF,
"Number of child processes launched at server startup"),
AP_INIT_TAKE1("MinSpareServers", set_min_free_servers, NULL, RSRC_CONF,
"Minimum number of idle children, to handle request spikes"),
AP_INIT_TAKE1("MaxSpareServers", set_max_free_servers, NULL, RSRC_CONF,
"Maximum number of idle children"),
AP_INIT_TAKE1("MaxClients", set_max_clients, NULL, RSRC_CONF,
"Maximum number of children alive at the same time"),
AP_INIT_TAKE1("ServerLimit", set_server_limit, NULL, RSRC_CONF,
"Maximum value of MaxClients for this run of Apache"),
AP_GRACEFUL_SHUTDOWN_TIMEOUT_COMMAND,
{ NULL }
};
module AP_MODULE_DECLARE_DATA mpm_prefork_module = {
MPM20_MODULE_STUFF,
ap_mpm_rewrite_args,
NULL,
NULL,
NULL,
NULL,
prefork_cmds,
prefork_hooks,
};