0f081398cf0eef8cc7c66a535d450110a92dc8aefielding

533d85911f7e4914ee5f9d5c99a2421f4ab4208asf#define CORE_PRIVATE

1ccd992d37d62c8cb2056126f2234f64ec189bfddougm

0f081398cf0eef8cc7c66a535d450110a92dc8aefielding#include "ap_config.h"

0f081398cf0eef8cc7c66a535d450110a92dc8aefielding#include "apr_portable.h"

43c3e6a4b559b76b750c245ee95e2782c15b4296jim#include "apr_file_io.h"

0f081398cf0eef8cc7c66a535d450110a92dc8aefielding#include "httpd.h"

43c3e6a4b559b76b750c245ee95e2782c15b4296jim#include "http_main.h"

0f081398cf0eef8cc7c66a535d450110a92dc8aefielding#include "http_log.h"

43c3e6a4b559b76b750c245ee95e2782c15b4296jim#include "http_config.h" /* for read_config */

43c3e6a4b559b76b750c245ee95e2782c15b4296jim#include "http_core.h" /* for get_remote_host */

0f081398cf0eef8cc7c66a535d450110a92dc8aefielding#include "http_connection.h"

43c3e6a4b559b76b750c245ee95e2782c15b4296jim#include "ap_mpm.h"

43c3e6a4b559b76b750c245ee95e2782c15b4296jim#include "unixd.h"

43c3e6a4b559b76b750c245ee95e2782c15b4296jim#include "mpm_common.h"

9b3073cc691d1b5a38a4068d8dfe69f81335cf6dsf#include "iol_socket.h"

43c3e6a4b559b76b750c245ee95e2782c15b4296jim#include "ap_listen.h"

0f081398cf0eef8cc7c66a535d450110a92dc8aefielding#include "mpm_default.h"

43c3e6a4b559b76b750c245ee95e2782c15b4296jim#include "mpm.h"

43c3e6a4b559b76b750c245ee95e2782c15b4296jim#include "scoreboard.h"

0f081398cf0eef8cc7c66a535d450110a92dc8aefielding

0f081398cf0eef8cc7c66a535d450110a92dc8aefielding#ifdef HAVE_UNISTD_H

fd0edaa8e3d4dd67d0604ccef2e96b071db96643fielding#include <unistd.h>

ab172d76c59ec820ae07bbdd4d6f18a38955bfd6minfrin#endif

5c5130fbb9d7aa3df3b908a19f1a358f45e25cbestoddard#include <poll.h>

5c5130fbb9d7aa3df3b908a19f1a358f45e25cbestoddard#ifdef HAVE_SYS_SOCKET_H

31360b9fcb08b728b4ca0bf80720ebb589ad7ab8wrowe#include <sys/socket.h>

31360b9fcb08b728b4ca0bf80720ebb589ad7ab8wrowe#endif

31360b9fcb08b728b4ca0bf80720ebb589ad7ab8wrowe#ifdef HAVE_NETINET_TCP_H

31360b9fcb08b728b4ca0bf80720ebb589ad7ab8wrowe#include <netinet/tcp.h>

185aa71728867671e105178b4c66fbc22b65ae26sf#endif

31360b9fcb08b728b4ca0bf80720ebb589ad7ab8wrowe#include <pthread.h>

31360b9fcb08b728b4ca0bf80720ebb589ad7ab8wrowe#include <signal.h>

31360b9fcb08b728b4ca0bf80720ebb589ad7ab8wrowe

2fc50921b88defeb7127985dfe4b4130175e069ejwoolley

0c9166d0186cf0e1ad397025f730ae6967f44ce6jortonstatic int threads_to_start = 0; /* Worker threads per child */

0c9166d0186cf0e1ad397025f730ae6967f44ce6jortonstatic int min_spare_threads = 0;

2fc50921b88defeb7127985dfe4b4130175e069ejwoolleystatic int max_spare_threads = 0;

5c5130fbb9d7aa3df3b908a19f1a358f45e25cbestoddardstatic int max_threads = 0;

5c5130fbb9d7aa3df3b908a19f1a358f45e25cbestoddardstatic int max_requests_per_child = 0;

5c5130fbb9d7aa3df3b908a19f1a358f45e25cbestoddardstatic const char *ap_pid_fname=NULL;

185aa71728867671e105178b4c66fbc22b65ae26sfAPI_VAR_EXPORT const char *ap_scoreboard_fname=NULL;

5c5130fbb9d7aa3df3b908a19f1a358f45e25cbestoddardstatic int num_daemons=0;

1715880355ef7f574cae2e8f973411b51acededeylavicstatic int workers_may_exit = 0;

d1328db7e306ad19f87239bc97d66d37c520e3b1wrowestatic int requests_this_child;

5c5130fbb9d7aa3df3b908a19f1a358f45e25cbestoddardstatic int num_listenfds = 0;

5c5130fbb9d7aa3df3b908a19f1a358f45e25cbestoddardstatic ap_socket_t **listenfds;

5c5130fbb9d7aa3df3b908a19f1a358f45e25cbestoddard

fd0edaa8e3d4dd67d0604ccef2e96b071db96643fieldingstruct ap_ctable ap_child_table[HARD_SERVER_LIMIT];

0f081398cf0eef8cc7c66a535d450110a92dc8aefielding

36ef8f77bffe75d1aa327882be1b5bdbe2ff567asfint ap_max_daemons_limit = -1;

0f081398cf0eef8cc7c66a535d450110a92dc8aefielding

fd0edaa8e3d4dd67d0604ccef2e96b071db96643fieldingstatic char ap_coredump_dir[MAX_STRING_LEN];

f05787953018140838ad51456c86c965d6a86267jim

f05787953018140838ad51456c86c965d6a86267jimstatic ap_file_t *pipe_of_death_in = NULL;

f05787953018140838ad51456c86c965d6a86267jimstatic ap_file_t *pipe_of_death_out = NULL;

f05787953018140838ad51456c86c965d6a86267jimstatic pthread_mutex_t pipe_of_death_mutex;

f05787953018140838ad51456c86c965d6a86267jim

0f081398cf0eef8cc7c66a535d450110a92dc8aefielding

server_rec *ap_server_conf;

static int one_process = 0;

#ifdef DEBUG_SIGSTOP

int raise_sigstop_flags;

#endif

static ap_pool_t *pconf; /* Pool for config stuff */

static ap_pool_t *pchild; /* Pool for httpd child stuff */

static ap_pool_t *thread_pool_parent; /* Parent of per-thread pools */

static pthread_mutex_t thread_pool_parent_mutex;

static int child_num;

static int my_pid; /* Linux getpid() doesn't work except in main thread. Use

static int worker_thread_count;

static pthread_mutex_t worker_thread_count_mutex;

static int worker_thread_free_ids[HARD_THREAD_LIMIT];

static pthread_attr_t worker_thread_attr;

static int idle_thread_count;

static pthread_mutex_t idle_thread_count_mutex;

#ifdef NO_SERIALIZED_ACCEPT

#define SAFE_ACCEPT(stmt) APR_SUCCESS

#else

#define SAFE_ACCEPT(stmt) (stmt)

static ap_lock_t *process_accept_mutex;

#endif /* NO_SERIALIZED_ACCEPT */

static const char *lock_fname;

static pthread_mutex_t thread_accept_mutex = PTHREAD_MUTEX_INITIALIZER;

API_EXPORT(const server_rec *) ap_get_server_conf(void)

{

return (ap_server_conf);

}

API_EXPORT(int) ap_get_max_daemons(void)

{

return ap_max_daemons_limit;

}

static void clean_child_exit(int code)

{

if (pchild) {

ap_destroy_pool(pchild);

}

exit(code);

}

static void sig_coredump(int sig)

{

chdir(ap_coredump_dir);

ap_signal(sig, SIG_DFL);

kill(getpid(), sig);

/* At this point we've got sig blocked, because we're still inside

}

static void just_die(int sig)

{

clean_child_exit(0);

}

static int volatile shutdown_pending;

static int volatile restart_pending;

static int volatile is_graceful;

void ap_start_shutdown(void)

{

if (shutdown_pending == 1) {

/* Um, is this _probably_ not an error, if the user has

return;

}

shutdown_pending = 1;

}

void ap_start_restart(int graceful)

{

if (restart_pending == 1) {

/* Probably not an error - don't bother reporting it */

return;

}

restart_pending = 1;

is_graceful = graceful;

}

static void sig_term(int sig)

{

ap_start_shutdown();

}

static void restart(int sig)

{

#ifndef WIN32

ap_start_restart(sig == SIGWINCH);

#else

ap_start_restart(1);

#endif

}

static void set_signals(void)

{

#ifndef NO_USE_SIGACTION

struct sigaction sa;

sigemptyset(&sa.sa_mask);

sa.sa_flags = 0;

if (!one_process) {

sa.sa_handler = sig_coredump;

#if defined(SA_ONESHOT)

sa.sa_flags = SA_ONESHOT;

#elif defined(SA_RESETHAND)

sa.sa_flags = SA_RESETHAND;

#endif

if (sigaction(SIGSEGV, &sa, NULL) < 0)

ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, "sigaction(SIGSEGV)");

#ifdef SIGBUS

if (sigaction(SIGBUS, &sa, NULL) < 0)

ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, "sigaction(SIGBUS)");

#endif

#ifdef SIGABORT

if (sigaction(SIGABORT, &sa, NULL) < 0)

ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, "sigaction(SIGABORT)");

#endif

#ifdef SIGABRT

if (sigaction(SIGABRT, &sa, NULL) < 0)

ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, "sigaction(SIGABRT)");

#endif

#ifdef SIGILL

if (sigaction(SIGILL, &sa, NULL) < 0)

ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, "sigaction(SIGILL)");

#endif

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 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

/* we want to ignore HUPs and WINCH while we're busy processing one */

sigaddset(&sa.sa_mask, SIGHUP);

sigaddset(&sa.sa_mask, SIGWINCH);

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(SIGWINCH, &sa, NULL) < 0)

ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, "sigaction(SIGWINCH)");

#else

if (!one_process) {

ap_signal(SIGSEGV, sig_coredump);

#ifdef SIGBUS

ap_signal(SIGBUS, sig_coredump);

#endif /* SIGBUS */

#ifdef SIGABORT

ap_signal(SIGABORT, sig_coredump);

#endif /* SIGABORT */

#ifdef SIGABRT

ap_signal(SIGABRT, sig_coredump);

#endif /* SIGABRT */

#ifdef SIGILL

ap_signal(SIGILL, sig_coredump);

#endif /* SIGILL */

#ifdef SIGXCPU

ap_signal(SIGXCPU, SIG_DFL);

#endif /* SIGXCPU */

#ifdef SIGXFSZ

ap_signal(SIGXFSZ, SIG_DFL);

#endif /* SIGXFSZ */

}

ap_signal(SIGTERM, sig_term);

#ifdef SIGHUP

ap_signal(SIGHUP, restart);

#endif /* SIGHUP */

#ifdef SIGWINCH

ap_signal(SIGWINCH, restart);

#endif /* SIGWINCH */

#ifdef SIGPIPE

ap_signal(SIGPIPE, SIG_IGN);

#endif /* SIGPIPE */

#endif

}

static void process_child_status(ap_proc_t *pid, ap_wait_t status)

{

/* Child died... if it died due to a fatal error,

if ((WIFEXITED(status)) &&

WEXITSTATUS(status) == APEXIT_CHILDFATAL) {

ap_log_error(APLOG_MARK, APLOG_ALERT|APLOG_NOERRNO, 0, ap_server_conf,

"Child %ld returned a Fatal error... \n"

"Apache is exiting!",

(long)pid->pid);

exit(APEXIT_CHILDFATAL);

}

if (WIFSIGNALED(status)) {

switch (WTERMSIG(status)) {

case SIGTERM:

case SIGHUP:

case SIGUSR1:

case SIGKILL:

break;

default:

#ifdef SYS_SIGLIST

#ifdef WCOREDUMP

if (WCOREDUMP(status)) {

ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_NOTICE, 0,

ap_server_conf,

"child pid %ld exit signal %s (%d), "

"possible coredump in %s",

(long)pid->pid, (WTERMSIG(status) >= NumSIG) ? "" :

SYS_SIGLIST[WTERMSIG(status)], WTERMSIG(status),

ap_coredump_dir);

}

else {

#endif

ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_NOTICE, 0,

ap_server_conf,

"child pid %ld exit signal %s (%d)",

(long)pid->pid,

SYS_SIGLIST[WTERMSIG(status)], WTERMSIG(status));

#ifdef WCOREDUMP

}

#endif

#else

ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_NOTICE, 0,

ap_server_conf,

"child pid %ld exit signal %d",

(long)pid->pid, WTERMSIG(status));

#endif

}

}

}

static int setup_listeners(server_rec *s)

{

ap_listen_rec *lr;

int num_listeners = 0;

if (ap_listen_open(s->process, s->port)) {

return 0;

}

for (lr = ap_listeners; lr; lr = lr->next) {

num_listeners++;

}

return num_listeners;

}

#if defined(TCP_NODELAY) && !defined(MPE) && !defined(TPF)

static void sock_disable_nagle(int s)

{

/* The Nagle algorithm says that we should delay sending partial

int just_say_no = 1;

if (setsockopt(s, IPPROTO_TCP, TCP_NODELAY, (char *) &just_say_no,

sizeof(int)) < 0) {

ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf,

"setsockopt: (TCP_NODELAY)");

}

}

#else

#define sock_disable_nagle(s) /* NOOP */

#endif

int ap_graceful_stop_signalled(void)

{

/* XXX - Does this really work? - Manoj */

return is_graceful;

}

static void process_socket(ap_pool_t *p, ap_socket_t *sock, long conn_id)

{

BUFF *conn_io;

conn_rec *current_conn;

ap_iol *iol;

int csd;

ap_status_t rv;

if ((rv = ap_get_os_sock(&csd, sock)) != APR_SUCCESS) {

ap_log_error(APLOG_MARK, APLOG_ERR, rv, NULL, "ap_get_os_sock");

}

if (csd >= FD_SETSIZE) {

ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_WARNING, 0, NULL,

"new file descriptor %d is too large; you probably need "

"to rebuild Apache with a larger FD_SETSIZE "

"(currently %d)",

csd, FD_SETSIZE);

ap_close_socket(sock);

return;

}

sock_disable_nagle(csd);

iol = unix_attach_socket(sock);

conn_io = ap_bcreate(p, B_RDWR);

ap_bpush_iol(conn_io, iol);

current_conn = ap_new_apr_connection(p, ap_server_conf, conn_io, sock,

conn_id);

ap_process_connection(current_conn);

ap_lingering_close(current_conn);

}

static void *worker_thread(void *);

static int start_thread(void)

{

pthread_t thread;

pthread_mutex_lock(&worker_thread_count_mutex);

if (worker_thread_count < max_threads) {

if (pthread_create(&thread, &worker_thread_attr, worker_thread,

&worker_thread_free_ids[worker_thread_count])) {

ap_log_error(APLOG_MARK, APLOG_ALERT, errno, ap_server_conf,

"pthread_create: unable to create worker thread");

/* In case system resources are maxxed out, we don't want

sleep(10);

workers_may_exit = 1;

pthread_mutex_unlock(&worker_thread_count_mutex);

return 0;

}

else {

worker_thread_count++;

}

}

else {

static int reported = 0;

if (!reported) {

ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_ERR, 0, ap_server_conf,

"server reached MaxThreadsPerChild setting, consider raising the"

" MaxThreadsPerChild or NumServers settings");

reported = 1;

}

pthread_mutex_unlock(&worker_thread_count_mutex);

return 0;

}

pthread_mutex_unlock(&worker_thread_count_mutex);

return 1;

}

static void check_pipe_of_death(void)

{

pthread_mutex_lock(&pipe_of_death_mutex);

if (!workers_may_exit) {

int ret;

char pipe_read_char;

ap_ssize_t n = 1;

ret = ap_recv(listenfds[0], &pipe_read_char, &n);

if (ap_canonical_error(ret) == APR_EAGAIN) {

/* It lost the lottery. It must continue to suffer

}

else {

/* It won the lottery (or something else is very

workers_may_exit = 1;

}

}

pthread_mutex_unlock(&pipe_of_death_mutex);

}

static void *worker_thread(void *arg)

{

ap_socket_t *csd = NULL;

ap_pool_t *tpool; /* Pool for this thread */

ap_pool_t *ptrans; /* Pool for per-transaction stuff */

ap_socket_t *sd = NULL;

int srv;

int curr_pollfd, last_pollfd = 0;

int thread_just_started = 1;

int thread_num = *((int *) arg);

long conn_id = child_num * HARD_THREAD_LIMIT + thread_num;

ap_pollfd_t *pollset;

int n;

ap_status_t rv;

pthread_mutex_lock(&thread_pool_parent_mutex);

ap_create_pool(&tpool, thread_pool_parent);

pthread_mutex_unlock(&thread_pool_parent_mutex);

ap_create_pool(&ptrans, tpool);

ap_setup_poll(&pollset, num_listenfds+1, tpool);

for(n=0 ; n <= num_listenfds ; ++n)

ap_add_poll_socket(pollset, listenfds[n], APR_POLLIN);

while (!workers_may_exit) {

workers_may_exit |= (max_requests_per_child != 0) && (requests_this_child <= 0);

if (workers_may_exit) break;

if (!thread_just_started) {

pthread_mutex_lock(&idle_thread_count_mutex);

if (idle_thread_count < max_spare_threads) {

idle_thread_count++;

pthread_mutex_unlock(&idle_thread_count_mutex);

}

else {

pthread_mutex_unlock(&idle_thread_count_mutex);

break;

}

}

else {

thread_just_started = 0;

}

pthread_mutex_lock(&thread_accept_mutex);

if (workers_may_exit) {

pthread_mutex_unlock(&thread_accept_mutex);

break;

}

if ((rv = SAFE_ACCEPT(ap_lock(process_accept_mutex)))

!= APR_SUCCESS) {

ap_log_error(APLOG_MARK, APLOG_EMERG, rv, ap_server_conf,

"ap_lock failed. Attempting to shutdown "

"process gracefully.");

workers_may_exit = 1;

}

while (!workers_may_exit) {

ap_int16_t event;

srv = ap_poll(pollset, &n, -1);

if (srv != APR_SUCCESS) {

if (ap_canonical_error(srv) == APR_EINTR) {

continue;

}

/* ap_poll() will only return errors in catastrophic

ap_log_error(APLOG_MARK, APLOG_ERR, srv, (const server_rec *)

ap_get_server_conf(), "ap_poll: (listen)");

workers_may_exit = 1;

}

if (workers_may_exit) break;

ap_get_revents(&event, listenfds[0], pollset);

if (event & APR_POLLIN) {

/* A process got a signal on the shutdown pipe. Check if we're

check_pipe_of_death();

continue;

}

if (num_listenfds == 1) {

sd = ap_listeners->sd;

goto got_fd;

}

else {

/* find a listener */

curr_pollfd = last_pollfd;

do {

curr_pollfd++;

if (curr_pollfd > num_listenfds) {

curr_pollfd = 1;

}

/* XXX: Should we check for POLLERR? */

ap_get_revents(&event, listenfds[curr_pollfd], pollset);

if (event & APR_POLLIN) {

last_pollfd = curr_pollfd;

sd = listenfds[curr_pollfd];

goto got_fd;

}

} while (curr_pollfd != last_pollfd);

}

}

got_fd:

if (!workers_may_exit) {

if ((rv = ap_accept(&csd, sd, ptrans)) != APR_SUCCESS) {

ap_log_error(APLOG_MARK, APLOG_ERR, rv, ap_server_conf, "ap_accept");

}

if ((rv = SAFE_ACCEPT(ap_unlock(process_accept_mutex)))

!= APR_SUCCESS) {

ap_log_error(APLOG_MARK, APLOG_EMERG, rv, ap_server_conf,

"ap_unlock failed. Attempting to shutdown "

"process gracefully.");

workers_may_exit = 1;

}

pthread_mutex_unlock(&thread_accept_mutex);

pthread_mutex_lock(&idle_thread_count_mutex);

if (idle_thread_count > min_spare_threads) {

idle_thread_count--;

}

else {

if (!start_thread()) {

idle_thread_count--;

}

}

pthread_mutex_unlock(&idle_thread_count_mutex);

process_socket(ptrans, csd, conn_id);

requests_this_child--;

} else {

if ((rv = SAFE_ACCEPT(ap_unlock(process_accept_mutex)))

!= APR_SUCCESS) {

ap_log_error(APLOG_MARK, APLOG_EMERG, rv, ap_server_conf,

"ap_unlock failed. Attempting to shutdown "

"process gracefully.");

workers_may_exit = 1;

}

pthread_mutex_unlock(&thread_accept_mutex);

pthread_mutex_lock(&idle_thread_count_mutex);

idle_thread_count--;

pthread_mutex_unlock(&idle_thread_count_mutex);

break;

}

ap_clear_pool(ptrans);

}

pthread_mutex_lock(&thread_pool_parent_mutex);

ap_destroy_pool(tpool);

pthread_mutex_unlock(&thread_pool_parent_mutex);

pthread_mutex_lock(&worker_thread_count_mutex);

worker_thread_count--;

worker_thread_free_ids[worker_thread_count] = thread_num;

if (worker_thread_count == 0) {

/* All the threads have exited, now finish the shutdown process

kill(my_pid, SIGTERM);

}

pthread_mutex_unlock(&worker_thread_count_mutex);

return NULL;

}

static void child_main(int child_num_arg)

{

sigset_t sig_mask;

int signal_received;

int i;

ap_listen_rec *lr;

ap_status_t rv;

my_pid = getpid();

child_num = child_num_arg;

ap_create_pool(&pchild, pconf);

/*stuff to do before we switch id's, so we have permissions.*/

rv = SAFE_ACCEPT(ap_child_init_lock(&process_accept_mutex, lock_fname,

pchild));

if (rv != APR_SUCCESS) {

ap_log_error(APLOG_MARK, APLOG_EMERG, rv, ap_server_conf,

"Couldn't initialize cross-process lock in child");

clean_child_exit(APEXIT_CHILDFATAL);

}

if (unixd_setup_child()) {

clean_child_exit(APEXIT_CHILDFATAL);

}

ap_child_init_hook(pchild, ap_server_conf);

/*done with init critical section */

/* All threads should mask signals out, accoring to sigwait(2) man page */

sigfillset(&sig_mask);

#ifdef SIGPROCMASK_SETS_THREAD_MASK

if (sigprocmask(SIG_SETMASK, &sig_mask, NULL) != 0) {

ap_log_error(APLOG_MARK, APLOG_ALERT, errno, ap_server_conf, "sigprocmask");

}

#else

if (pthread_sigmask(SIG_SETMASK, &sig_mask, NULL) != 0) {

ap_log_error(APLOG_MARK, APLOG_ALERT, errno, ap_server_conf,

"pthread_sigmask");

}

#endif

requests_this_child = max_requests_per_child;

/* Set up the pollfd array */

listenfds = ap_pcalloc(pchild, sizeof(*listenfds) * (num_listenfds + 1));

#if APR_FILES_AS_SOCKETS

ap_socket_from_file(&listenfds[0], pipe_of_death_in);

#endif

for (lr = ap_listeners, i = 1; i <= num_listenfds; lr = lr->next, ++i)

listenfds[i]=lr->sd;

/* Setup worker threads */

if (threads_to_start > max_threads) {

threads_to_start = max_threads;

}

idle_thread_count = threads_to_start;

worker_thread_count = 0;

for (i = 0; i < max_threads; i++) {

worker_thread_free_ids[i] = i;

}

ap_create_pool(&thread_pool_parent, pchild);

pthread_mutex_init(&thread_pool_parent_mutex, NULL);

pthread_mutex_init(&idle_thread_count_mutex, NULL);

pthread_mutex_init(&worker_thread_count_mutex, NULL);

pthread_mutex_init(&pipe_of_death_mutex, NULL);

pthread_attr_init(&worker_thread_attr);

#ifdef PTHREAD_ATTR_SETDETACHSTATE_ARG2_ADDR

{

int on = 1;

pthread_attr_setdetachstate(&worker_thread_attr, &on);

}

#else

pthread_attr_setdetachstate(&worker_thread_attr, PTHREAD_CREATE_DETACHED);

#endif

/* We are creating worker threads right now */

for (i=0; i < threads_to_start; i++) {

/* start_thread shouldn't fail here */

if (!start_thread()) {

break;

}

}

/* This thread will be the one responsible for handling signals */

sigemptyset(&sig_mask);

sigaddset(&sig_mask, SIGTERM);

sigaddset(&sig_mask, SIGINT);

ap_sigwait(&sig_mask, &signal_received);

switch (signal_received) {

case SIGTERM:

case SIGINT:

just_die(signal_received);

break;

default:

ap_log_error(APLOG_MARK, APLOG_ALERT, errno, ap_server_conf,

"received impossible signal: %d", signal_received);

just_die(SIGTERM);

}

}

static int make_child(server_rec *s, int slot, time_t now)

{

int pid;

if (slot + 1 > ap_max_daemons_limit) {

ap_max_daemons_limit = slot + 1;

}

if (one_process) {

set_signals();

ap_child_table[slot].pid = getpid();

ap_child_table[slot].status = SERVER_ALIVE;

child_main(slot);

}

if ((pid = fork()) == -1) {

ap_log_error(APLOG_MARK, APLOG_ERR, errno, s,

"fork: Unable to fork new process");

/* In case system resources are maxxed out, we don't want

sleep(10);

return -1;

}

if (!pid) {

#ifdef AIX_BIND_PROCESSOR

/* By default, AIX binds to a single processor. This bit unbinds

#include <sys/processor.h>

int status = bindprocessor(BINDPROCESS, (int)getpid(),

PROCESSOR_CLASS_ANY);

if (status != OK)

ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_WARNING, errno,

ap_server_conf, "processor unbind failed %d", status);

#endif

RAISE_SIGSTOP(MAKE_CHILD);

/* XXX - For an unthreaded server, a signal handler will be necessary

child_main(slot);

return 0;

}

/* else */

ap_child_table[slot].pid = pid;

ap_child_table[slot].status = SERVER_ALIVE;

return 0;

}

static int startup_children(int number_to_start)

{

int i;

for (i = 0; number_to_start && i < num_daemons; ++i) {

if (ap_child_table[i].status != SERVER_DEAD) {

continue;

}

if (make_child(ap_server_conf, i, 0) < 0) {

break;

}

--number_to_start;

}

return number_to_start;

}

static int spawn_rate = 1;

#ifndef MAX_SPAWN_RATE

#define MAX_SPAWN_RATE (32)

#endif

static int hold_off_on_exponential_spawning;

static void perform_child_maintenance(void)

{

int i;

time_t now = 0;

int free_length;

int free_slots[MAX_SPAWN_RATE];

int last_non_dead = -1;

/* initialize the free_list */

free_length = 0;

for (i = 0; i < num_daemons; ++i) {

if (ap_child_table[i].status == SERVER_DEAD) {

if (free_length < spawn_rate) {

free_slots[free_length] = i;

++free_length;

}

}

else {

last_non_dead = i;

}

if (i >= ap_max_daemons_limit && free_length >= spawn_rate) {

break;

}

}

ap_max_daemons_limit = last_non_dead + 1;

if (free_length > 0) {

for (i = 0; i < free_length; ++i) {

make_child(ap_server_conf, free_slots[i], now);

}

/* the next time around we want to spawn twice as many if this

if (hold_off_on_exponential_spawning) {

--hold_off_on_exponential_spawning;

}

else if (spawn_rate < MAX_SPAWN_RATE) {

spawn_rate *= 2;

}

}

else {

spawn_rate = 1;

}

}

static void server_main_loop(int remaining_children_to_start)

{

int child_slot;

ap_wait_t status;

ap_proc_t pid;

int i;

while (!restart_pending && !shutdown_pending) {

ap_wait_or_timeout(&status, &pid, pconf);

if (pid.pid != -1) {

process_child_status(&pid, status);

/* non-fatal death... note that it's gone in the child table and

child_slot = -1;

for (i = 0; i < ap_max_daemons_limit; ++i) {

if (ap_child_table[i].pid == pid.pid) {

int j;

child_slot = i;

for (j = 0; j < HARD_THREAD_LIMIT; j++) {

ap_dexter_force_reset_connection_status(i * HARD_THREAD_LIMIT + j);

}

break;

}

}

if (child_slot >= 0) {

ap_child_table[child_slot].status = SERVER_DEAD;

if (remaining_children_to_start

&& child_slot < num_daemons) {

/* we're still doing a 1-for-1 replacement of dead

make_child(ap_server_conf, child_slot, time(NULL));

--remaining_children_to_start;

}

#ifdef APR_HAS_OTHER_CHILD

}

else if (ap_reap_other_child(&pid, status) == 0) {

/* handled */

#endif

}

else if (is_graceful) {

/* Great, we've probably just lost a slot in the

ap_log_error(APLOG_MARK, APLOG_NOERRNO|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,

continue;

}

else if (remaining_children_to_start) {

/* we hit a 1 second timeout in which none of the previous

remaining_children_to_start = \

startup_children(remaining_children_to_start);

/* In any event we really shouldn't do the code below because

continue;

}

perform_child_maintenance();

}

}

int ap_mpm_run(ap_pool_t *_pconf, ap_pool_t *plog, server_rec *s)

{

int remaining_children_to_start;

int i;

ap_status_t rv;

ap_ssize_t one = 1;

pconf = _pconf;

ap_server_conf = s;

if ((rv = ap_create_pipe(&pipe_of_death_in, &pipe_of_death_out, pconf))

!= APR_SUCCESS) {

ap_log_error(APLOG_MARK, APLOG_ERR, rv,

(const server_rec*) ap_server_conf,

"ap_create_pipe (pipe_of_death)");

exit(1);

}

if ((rv = ap_set_pipe_timeout(pipe_of_death_in, 0)) != APR_SUCCESS) {

ap_log_error(APLOG_MARK, APLOG_ERR, rv,

(const server_rec*) ap_server_conf,

"ap_set_pipe_timeout (pipe_of_death)");

exit(1);

}

ap_server_conf = s;

if ((num_listenfds = setup_listeners(ap_server_conf)) < 1) {

/* XXX: hey, what's the right way for the mpm to indicate a fatal error? */

ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_ALERT, 0, s,

"no listening sockets available, shutting down");

return 1;

}

ap_log_pid(pconf, ap_pid_fname);

/* Initialize cross-process accept lock */

lock_fname = ap_psprintf(_pconf, "%s.%lu",

ap_server_root_relative(_pconf, lock_fname),

my_pid);

rv = SAFE_ACCEPT(ap_create_lock(&process_accept_mutex, APR_MUTEX,

APR_CROSS_PROCESS, lock_fname, _pconf));

if (rv != APR_SUCCESS) {

ap_log_error(APLOG_MARK, APLOG_EMERG, rv, s,

"Couldn't create cross-process lock");

return 1;

}

if (!is_graceful) {

reinit_scoreboard(pconf);

}

/* Initialize the child table */

if (!is_graceful) {

for (i = 0; i < HARD_SERVER_LIMIT; i++) {

ap_child_table[i].status = SERVER_DEAD;

}

}

set_signals();

/* If we're doing a graceful_restart then we're going to see a lot

remaining_children_to_start = num_daemons;

if (!is_graceful) {

remaining_children_to_start = \

startup_children(remaining_children_to_start);

}

else {

/* give the system some time to recover before kicking into

hold_off_on_exponential_spawning = 10;

}

ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_NOTICE, 0, ap_server_conf,

"%s configured -- resuming normal operations",

ap_get_server_version());

ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_INFO, 0, ap_server_conf,

"Server built: %s", ap_get_server_built());

restart_pending = shutdown_pending = 0;

server_main_loop(remaining_children_to_start);

if (shutdown_pending) {

/* Time to gracefully shut down:

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_NOERRNO|APLOG_INFO, 0,

ap_server_conf,

"removed PID file %s (pid=%ld)",

pidfile, (long)getpid());

}

ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_NOTICE, 0,

ap_server_conf, "caught SIGTERM, shutting down");

return 1;

}

/* we've been told to restart */

ap_signal(SIGHUP, SIG_IGN);

if (one_process) {

/* not worth thinking about */

return 1;

}

if (is_graceful) {

char char_of_death = '!';

ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_NOTICE, 0, ap_server_conf,

"SIGWINCH received. Doing graceful restart");

/* This is mostly for debugging... so that we know what is still

for (i = 0; i < num_daemons; ++i) {

if (ap_child_table[i].status != SERVER_DEAD) {

ap_child_table[i].status = SERVER_DYING;

}

}

/* give the children the signal to die */

for (i = 0; i < num_daemons;) {

if ((rv = ap_write(pipe_of_death_out, &char_of_death, &one)) != APR_SUCCESS) {

if (ap_canonical_error(rv) == APR_EINTR) continue;

ap_log_error(APLOG_MARK, APLOG_WARNING, rv, ap_server_conf,

"write pipe_of_death");

}

i++;

}

}

else {

/* Kill 'em all. Since the child acts the same on the parents SIGTERM

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 */

ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_NOTICE, 0,

ap_server_conf, "SIGHUP received. Attempting to restart");

}

return 0;

}

static void dexter_pre_config(ap_pool_t *p, ap_pool_t *plog, ap_pool_t *ptemp)

{

static int restart_num = 0;

one_process = !!getenv("ONE_PROCESS");

/* sigh, want this only the second time around */

if (restart_num++ == 1) {

is_graceful = 0;

if (!one_process) {

ap_detach();

}

my_pid = getpid();

}

unixd_pre_config();

ap_listen_pre_config();

num_daemons = DEFAULT_NUM_DAEMON;

threads_to_start = DEFAULT_START_THREAD;

min_spare_threads = DEFAULT_MIN_SPARE_THREAD;

max_spare_threads = DEFAULT_MAX_SPARE_THREAD;

max_threads = HARD_THREAD_LIMIT;

ap_pid_fname = DEFAULT_PIDLOG;

ap_scoreboard_fname = DEFAULT_SCOREBOARD;

lock_fname = DEFAULT_LOCKFILE;

max_requests_per_child = DEFAULT_MAX_REQUESTS_PER_CHILD;

ap_dexter_set_maintain_connection_status(1);

ap_cpystrn(ap_coredump_dir, ap_server_root, sizeof(ap_coredump_dir));

}

static void dexter_hooks(void)

{

INIT_SIGLIST()

one_process = 0;

ap_hook_pre_config(dexter_pre_config, NULL, NULL, AP_HOOK_MIDDLE);

}

static const char *set_pidfile(cmd_parms *cmd, void *dummy, const char *arg)

{

const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);

if (err != NULL) {

return err;

}

if (cmd->server->is_virtual) {

return "PidFile directive not allowed in <VirtualHost>";

}

ap_pid_fname = arg;

return NULL;

}

static const char *set_scoreboard(cmd_parms *cmd, void *dummy, const char *arg)

{

const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);

if (err != NULL) {

return err;

}

ap_scoreboard_fname = arg;

return NULL;

}

static const char *set_lockfile(cmd_parms *cmd, void *dummy, const char *arg)

{

const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);

if (err != NULL) {

return err;

}

lock_fname = arg;

return NULL;

}

static const char *set_num_daemons (cmd_parms *cmd, void *dummy, const char *arg)

{

const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);

if (err != NULL) {

return err;

}

num_daemons = atoi(arg);

if (num_daemons > HARD_SERVER_LIMIT) {

ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,

"WARNING: NumServers of %d exceeds compile time limit "

"of %d servers,", num_daemons, HARD_SERVER_LIMIT);

ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,

" lowering NumServers to %d. To increase, please "

"see the", HARD_SERVER_LIMIT);

ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,

" HARD_SERVER_LIMIT define in %s.",

AP_MPM_HARD_LIMITS_FILE);

num_daemons = HARD_SERVER_LIMIT;

}

else if (num_daemons < 1) {

ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,

"WARNING: Require NumServers > 0, setting to 1");

num_daemons = 1;

}

return NULL;

}

static const char *set_threads_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;

}

threads_to_start = atoi(arg);

if (threads_to_start > HARD_THREAD_LIMIT) {

ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,

"WARNING: StartThreads of %d exceeds compile time"

" limit of %d threads,", threads_to_start,

HARD_THREAD_LIMIT);

ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,

" lowering StartThreads to %d. To increase, please"

" see the", HARD_THREAD_LIMIT);

ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,

" HARD_THREAD_LIMIT define in %s.",

AP_MPM_HARD_LIMITS_FILE);

}

else if (threads_to_start < 1) {

ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,

"WARNING: Require StartThreads > 0, setting to 1");

threads_to_start = 1;

}

return NULL;

}

static const char *set_min_spare_threads(cmd_parms *cmd, void *dummy, const char *arg)

{

const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);

if (err != NULL) {

return err;

}

min_spare_threads = atoi(arg);

if (min_spare_threads <= 0) {

ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,

"WARNING: detected MinSpareThreads set to non-positive.");

ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,

"Resetting to 1 to avoid almost certain Apache failure.");

ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,

"Please read the documentation.");

min_spare_threads = 1;

}

return NULL;

}

static const char *set_max_spare_threads(cmd_parms *cmd, void *dummy, const char *arg)