658187feb755694eb5ff29561bda7109c22c743cAlexis Tsogias

96a6c2a58e8c534f983002f8d503f97ea1b4aa8dAlexis Tsogias#define CORE_PRIVATE

658187feb755694eb5ff29561bda7109c22c743cAlexis Tsogias

658187feb755694eb5ff29561bda7109c22c743cAlexis Tsogias#include "apr_portable.h"

658187feb755694eb5ff29561bda7109c22c743cAlexis Tsogias#include "apr_strings.h"

96a6c2a58e8c534f983002f8d503f97ea1b4aa8dAlexis Tsogias#include "apr_file_io.h"

96a6c2a58e8c534f983002f8d503f97ea1b4aa8dAlexis Tsogias#include "apr_thread_proc.h"

658187feb755694eb5ff29561bda7109c22c743cAlexis Tsogias#include "ap_config.h"

96a6c2a58e8c534f983002f8d503f97ea1b4aa8dAlexis Tsogias#include "httpd.h"

658187feb755694eb5ff29561bda7109c22c743cAlexis Tsogias#include "http_main.h"

658187feb755694eb5ff29561bda7109c22c743cAlexis Tsogias#include "http_log.h"

658187feb755694eb5ff29561bda7109c22c743cAlexis Tsogias#include "http_config.h" /* for read_config */

658187feb755694eb5ff29561bda7109c22c743cAlexis Tsogias#include "http_core.h" /* for get_remote_host */

658187feb755694eb5ff29561bda7109c22c743cAlexis Tsogias#include "http_connection.h"

658187feb755694eb5ff29561bda7109c22c743cAlexis Tsogias#include "ap_mpm.h"

72204f862232e7e51b0207bba020c1d781fa7798Christian Maeder#include "unixd.h"

658187feb755694eb5ff29561bda7109c22c743cAlexis Tsogias#include "mpm_common.h"

658187feb755694eb5ff29561bda7109c22c743cAlexis Tsogias#include "ap_listen.h"

72204f862232e7e51b0207bba020c1d781fa7798Christian Maeder#include "scoreboard.h"

658187feb755694eb5ff29561bda7109c22c743cAlexis Tsogias

658187feb755694eb5ff29561bda7109c22c743cAlexis Tsogias#ifdef HAVE_NETINET_TCP_H

96a6c2a58e8c534f983002f8d503f97ea1b4aa8dAlexis Tsogias#include <netinet/tcp.h>

658187feb755694eb5ff29561bda7109c22c743cAlexis Tsogias#endif

96a6c2a58e8c534f983002f8d503f97ea1b4aa8dAlexis Tsogias#ifdef HAVE_SYS_SOCKET_H

658187feb755694eb5ff29561bda7109c22c743cAlexis Tsogias#include <sys/socket.h>

658187feb755694eb5ff29561bda7109c22c743cAlexis Tsogias#endif

658187feb755694eb5ff29561bda7109c22c743cAlexis Tsogias#ifdef HAVE_SYS_WAIT_H

658187feb755694eb5ff29561bda7109c22c743cAlexis Tsogias#include <sys/wait.h>

72204f862232e7e51b0207bba020c1d781fa7798Christian Maeder#endif

72204f862232e7e51b0207bba020c1d781fa7798Christian Maeder#include <pthread.h>

658187feb755694eb5ff29561bda7109c22c743cAlexis Tsogias#include <signal.h>

658187feb755694eb5ff29561bda7109c22c743cAlexis Tsogias

658187feb755694eb5ff29561bda7109c22c743cAlexis Tsogias

658187feb755694eb5ff29561bda7109c22c743cAlexis Tsogiasint ap_threads_per_child=0; /* Worker threads per child */

72204f862232e7e51b0207bba020c1d781fa7798Christian Maederint ap_max_requests_per_child=0;

658187feb755694eb5ff29561bda7109c22c743cAlexis Tsogiasstatic const char *ap_pid_fname=NULL;

658187feb755694eb5ff29561bda7109c22c743cAlexis Tsogiasstatic int ap_daemons_to_start=0;

658187feb755694eb5ff29561bda7109c22c743cAlexis Tsogiasstatic int min_spare_threads=0;

658187feb755694eb5ff29561bda7109c22c743cAlexis Tsogiasstatic int max_spare_threads=0;

658187feb755694eb5ff29561bda7109c22c743cAlexis Tsogiasstatic int ap_daemons_limit=0;

658187feb755694eb5ff29561bda7109c22c743cAlexis Tsogiasstatic int workers_may_exit = 0;

658187feb755694eb5ff29561bda7109c22c743cAlexis Tsogiasstatic int requests_this_child;

658187feb755694eb5ff29561bda7109c22c743cAlexis Tsogiasstatic int num_listensocks = 0;

658187feb755694eb5ff29561bda7109c22c743cAlexis Tsogiasstatic apr_socket_t **listensocks;

658187feb755694eb5ff29561bda7109c22c743cAlexis Tsogias

658187feb755694eb5ff29561bda7109c22c743cAlexis Tsogiastypedef struct {

658187feb755694eb5ff29561bda7109c22c743cAlexis Tsogias int pid;

658187feb755694eb5ff29561bda7109c22c743cAlexis Tsogias int tid;

658187feb755694eb5ff29561bda7109c22c743cAlexis Tsogias int sd;

658187feb755694eb5ff29561bda7109c22c743cAlexis Tsogias apr_pool_t *tpool; /* "pthread" would be confusing */

658187feb755694eb5ff29561bda7109c22c743cAlexis Tsogias} proc_info;

658187feb755694eb5ff29561bda7109c22c743cAlexis Tsogias

658187feb755694eb5ff29561bda7109c22c743cAlexis Tsogiasint ap_max_daemons_limit = -1;

658187feb755694eb5ff29561bda7109c22c743cAlexis Tsogias

658187feb755694eb5ff29561bda7109c22c743cAlexis Tsogiaschar ap_coredump_dir[MAX_STRING_LEN];

658187feb755694eb5ff29561bda7109c22c743cAlexis Tsogias

658187feb755694eb5ff29561bda7109c22c743cAlexis Tsogiasstatic apr_file_t *pipe_of_death_in = NULL;

658187feb755694eb5ff29561bda7109c22c743cAlexis Tsogiasstatic apr_file_t *pipe_of_death_out = NULL;

658187feb755694eb5ff29561bda7109c22c743cAlexis Tsogiasstatic pthread_mutex_t pipe_of_death_mutex;

658187feb755694eb5ff29561bda7109c22c743cAlexis Tsogias

658187feb755694eb5ff29561bda7109c22c743cAlexis Tsogias

658187feb755694eb5ff29561bda7109c22c743cAlexis Tsogiasserver_rec *ap_server_conf;

658187feb755694eb5ff29561bda7109c22c743cAlexis Tsogias

658187feb755694eb5ff29561bda7109c22c743cAlexis Tsogias

658187feb755694eb5ff29561bda7109c22c743cAlexis Tsogiasstatic int one_process = 0;

658187feb755694eb5ff29561bda7109c22c743cAlexis Tsogias

658187feb755694eb5ff29561bda7109c22c743cAlexis Tsogias#ifdef DEBUG_SIGSTOP

658187feb755694eb5ff29561bda7109c22c743cAlexis Tsogiasint raise_sigstop_flags;

72204f862232e7e51b0207bba020c1d781fa7798Christian Maeder#endif

72204f862232e7e51b0207bba020c1d781fa7798Christian Maeder

72204f862232e7e51b0207bba020c1d781fa7798Christian Maederstatic apr_pool_t *pconf; /* Pool for config stuff */

72204f862232e7e51b0207bba020c1d781fa7798Christian Maederstatic apr_pool_t *pchild; /* Pool for httpd child stuff */

unsigned int ap_my_pid; /* Linux getpid() doesn't work except in main

static int worker_thread_count;

static pthread_mutex_t worker_thread_count_mutex;

static apr_lock_t *accept_mutex;

static const char *lock_fname;

#ifdef NO_SERIALIZED_ACCEPT

#define SAFE_ACCEPT(stmt) APR_SUCCESS

#else

#define SAFE_ACCEPT(stmt) (stmt)

#endif

AP_DECLARE(int) ap_get_max_daemons(void)

{

return ap_max_daemons_limit;

}

static void clean_child_exit(int code) __attribute__ ((noreturn));

void clean_child_exit(int code)

{

if (pchild) {

apr_destroy_pool(pchild);

}

exit(code);

}

static void sig_coredump(int sig)

{

chdir(ap_coredump_dir);

apr_signal(sig, SIG_DFL);

kill(ap_my_pid, 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;

ap_generation_t volatile ap_my_generation;

static void ap_start_shutdown(void)

{

if (shutdown_pending == 1) {

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

return;

}

shutdown_pending = 1;

}

static 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;

if (is_graceful) {

apr_kill_cleanup(pconf, NULL, ap_cleanup_shared_mem);

}

}

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) {

apr_signal(SIGSEGV, sig_coredump);

#ifdef SIGBUS

apr_signal(SIGBUS, sig_coredump);

#endif /* SIGBUS */

#ifdef SIGABORT

apr_signal(SIGABORT, sig_coredump);

#endif /* SIGABORT */

#ifdef SIGABRT

apr_signal(SIGABRT, sig_coredump);

#endif /* SIGABRT */

#ifdef SIGILL

apr_signal(SIGILL, sig_coredump);

#endif /* SIGILL */

#ifdef SIGXCPU

apr_signal(SIGXCPU, SIG_DFL);

#endif /* SIGXCPU */

#ifdef SIGXFSZ

apr_signal(SIGXFSZ, SIG_DFL);

#endif /* SIGXFSZ */

}

apr_signal(SIGTERM, sig_term);

#ifdef SIGHUP

apr_signal(SIGHUP, restart);

#endif /* SIGHUP */

#ifdef SIGWINCH

apr_signal(SIGWINCH, restart);

#endif /* SIGWINCH */

#ifdef SIGPIPE

apr_signal(SIGPIPE, SIG_IGN);

#endif /* SIGPIPE */

#endif

}

int ap_graceful_stop_signalled(void)

{

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

return is_graceful;

}

static void process_socket(apr_pool_t *p, apr_socket_t *sock, int my_child_num, int my_thread_num)

{

conn_rec *current_conn;

long conn_id = AP_ID_FROM_CHILD_THREAD(my_child_num, my_thread_num);

int csd;

(void) apr_get_os_sock(&csd, 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);

apr_close_socket(sock);

return;

}

ap_sock_disable_nagle(sock);

(void) ap_update_child_status(my_child_num, my_thread_num,

SERVER_BUSY_READ, (request_rec *) NULL);

current_conn = ap_new_connection(p, ap_server_conf, sock, conn_id);

ap_process_connection(current_conn);

ap_lingering_close(current_conn);

}

static void check_pipe_of_death(void)

{

pthread_mutex_lock(&pipe_of_death_mutex);

if (!workers_may_exit) {

apr_status_t ret;

char pipe_read_char;

apr_size_t n = 1;

ret = apr_recv(listensocks[0], &pipe_read_char, &n);

if (APR_STATUS_IS_EAGAIN(ret)) {

/* 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 * dummy)

{

proc_info * ti = dummy;

int process_slot = ti->pid;

int thread_slot = ti->tid;

apr_pool_t *tpool = ti->tpool;

apr_socket_t *csd = NULL;

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

apr_socket_t *sd = NULL;

int n;

int curr_pollfd, last_pollfd = 0;

apr_pollfd_t *pollset;

apr_status_t rv;

free(ti);

apr_create_pool(&ptrans, tpool);

pthread_mutex_lock(&worker_thread_count_mutex);

worker_thread_count++;

pthread_mutex_unlock(&worker_thread_count_mutex);

apr_setup_poll(&pollset, num_listensocks+1, tpool);

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

apr_add_poll_socket(pollset, listensocks[n], APR_POLLIN);

/* TODO: Switch to a system where threads reuse the results from earlier

while (1) {

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

if (workers_may_exit) break;

(void) ap_update_child_status(process_slot, thread_slot, SERVER_READY,

(request_rec *) NULL);

if ((rv = SAFE_ACCEPT(apr_lock(accept_mutex)))

!= APR_SUCCESS) {

ap_log_error(APLOG_MARK, APLOG_EMERG, rv, ap_server_conf,

"apr_lock failed. Attempting to shutdown "

"process gracefully.");

workers_may_exit = 1;

}

while (!workers_may_exit) {

apr_status_t ret;

apr_int16_t event;

ret = apr_poll(pollset, &n, -1);

if (ret != APR_SUCCESS) {

if (APR_STATUS_IS_EINTR(ret)) {

continue;

}

/* apr_poll() will only return errors in catastrophic

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

ap_server_conf, "apr_poll: (listen)");

workers_may_exit = 1;

}

if (workers_may_exit) break;

apr_get_revents(&event, listensocks[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_listensocks == 1) {

sd = ap_listeners->sd;

goto got_fd;

}

else {

/* find a listener */

curr_pollfd = last_pollfd;

do {

curr_pollfd++;

if (curr_pollfd > num_listensocks) {

curr_pollfd = 1;

}

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

apr_get_revents(&event, listensocks[curr_pollfd], pollset);

if (event & APR_POLLIN) {

last_pollfd = curr_pollfd;

sd=listensocks[curr_pollfd];

goto got_fd;

}

} while (curr_pollfd != last_pollfd);

}

}

got_fd:

if (!workers_may_exit) {

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

csd = NULL;

ap_log_error(APLOG_MARK, APLOG_ERR, rv, ap_server_conf,

"apr_accept");

}

if ((rv = SAFE_ACCEPT(apr_unlock(accept_mutex)))

!= APR_SUCCESS) {

ap_log_error(APLOG_MARK, APLOG_EMERG, rv, ap_server_conf,

"apr_unlock failed. Attempting to shutdown "

"process gracefully.");

workers_may_exit = 1;

}

if (csd != NULL) {

process_socket(ptrans, csd, process_slot, thread_slot);

requests_this_child--;

}

}

else {

if ((rv = SAFE_ACCEPT(apr_unlock(accept_mutex)))

!= APR_SUCCESS) {

ap_log_error(APLOG_MARK, APLOG_EMERG, rv, ap_server_conf,

"apr_unlock failed. Attempting to shutdown "

"process gracefully.");

workers_may_exit = 1;

}

break;

}

apr_clear_pool(ptrans);

}

apr_destroy_pool(tpool);

ap_update_child_status(process_slot, thread_slot, SERVER_DEAD,

(request_rec *) NULL);

pthread_mutex_lock(&worker_thread_count_mutex);

worker_thread_count--;

if (worker_thread_count == 0) {

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

kill(ap_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;

pthread_t thread;

pthread_attr_t thread_attr;

int i;

int my_child_num = child_num_arg;

proc_info *my_info = NULL;

ap_listen_rec *lr;

apr_status_t rv;

ap_my_pid = getpid();

apr_create_pool(&pchild, pconf);

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

reopen_scoreboard(pchild);

rv = SAFE_ACCEPT(apr_child_init_lock(&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 ((rv = pthread_sigmask(SIG_SETMASK, &sig_mask, NULL)) != 0) {

#ifdef PTHREAD_SETS_ERRNO

rv = errno;

#endif

ap_log_error(APLOG_MARK, APLOG_ALERT, rv, ap_server_conf, "pthread_sigmask");

}

#endif

requests_this_child = ap_max_requests_per_child;

/* Set up the pollfd array */

listensocks = apr_pcalloc(pchild,

sizeof(*listensocks) * (num_listensocks + 1));

#if APR_FILES_AS_SOCKETS

apr_socket_from_file(&listensocks[0], pipe_of_death_in);

#endif

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

listensocks[i]=lr->sd;

/* Setup worker threads */

worker_thread_count = 0;

pthread_mutex_init(&worker_thread_count_mutex, NULL);

pthread_mutex_init(&pipe_of_death_mutex, NULL);

pthread_attr_init(&thread_attr);

#ifdef PTHREAD_ATTR_SETDETACHSTATE_ARG2_ADDR

{

int on = 1;

pthread_attr_setdetachstate(&thread_attr, &on);

}

#else

pthread_attr_setdetachstate(&thread_attr, PTHREAD_CREATE_DETACHED);

#endif

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

my_info = (proc_info *)malloc(sizeof(proc_info));

if (my_info == NULL) {

ap_log_error(APLOG_MARK, APLOG_ALERT, errno, ap_server_conf,

"malloc: out of memory");

clean_child_exit(APEXIT_CHILDFATAL);

}

my_info->pid = my_child_num;

my_info->tid = i;

my_info->sd = 0;

apr_create_pool(&my_info->tpool, pchild);

/* We are creating threads right now */

(void) ap_update_child_status(my_child_num, i, SERVER_STARTING,

(request_rec *) NULL);

#ifndef NO_THREADS

if ((rv = pthread_create(&thread, &thread_attr, worker_thread, my_info))) {

#ifdef PTHREAD_SETS_ERRNO

rv = errno;

#endif

ap_log_error(APLOG_MARK, APLOG_ALERT, rv, ap_server_conf,

"pthread_create: unable to create worker thread");

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

sleep(10);

clean_child_exit(APEXIT_CHILDFATAL);

}

#else

worker_thread(my_info);

/* The SIGTERM shouldn't let us reach this point, but just in case... */

clean_child_exit(APEXIT_OK);

#endif

/* We let each thread update it's own scoreboard entry. This is done

}

pthread_attr_destroy(&thread_attr);

/* 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_scoreboard_image->parent[slot].pid = getpid();

child_main(slot);

}

/* Tag this slot as occupied so that perform_idle_server_maintenance

(void) ap_update_child_status(slot, 0, SERVER_STARTING, (request_rec *) NULL);

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

ap_log_error(APLOG_MARK, APLOG_ERR, errno, s, "fork: Unable to fork new process");

/* fork didn't succeed. Fix the scoreboard or else

(void) ap_update_child_status(slot, 0, SERVER_DEAD, (request_rec *) NULL);

/* 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);

apr_signal(SIGTERM, just_die);

child_main(slot);

return 0;

}

/* else */

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->parent[i].pid != 0) {

continue;

}

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

{

int i, j;

int idle_thread_count;

short_score *ss;

time_t now = 0;

int free_length;

int free_slots[MAX_SPAWN_RATE];

int last_non_dead;

int total_non_dead;

apr_size_t one = 1;

apr_status_t rv;

/* initialize the free_list */

free_length = 0;

idle_thread_count = 0;

last_non_dead = -1;

total_non_dead = 0;

ap_sync_scoreboard_image();

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

/* Initialization to satisfy the compiler. It doesn't know

int status = SERVER_DEAD;

int any_dying_threads = 0;

int all_dead_threads = 1;

int idle_thread_addition = 0;

if (i >= ap_max_daemons_limit && free_length == idle_spawn_rate)

break;

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

ss = &ap_scoreboard_image->servers[i][j];

status = ss->status;

any_dying_threads = any_dying_threads || (status == SERVER_DEAD)

|| (status == SERVER_GRACEFUL);

all_dead_threads = all_dead_threads && (status == SERVER_DEAD);

/* We consider a starting server as idle because we started it

if (status <= SERVER_READY) {

++idle_thread_addition;

}

}

if (all_dead_threads && free_length < idle_spawn_rate) {

free_slots[free_length] = i;

++free_length;

}

if (!all_dead_threads) {

last_non_dead = i;

}

if (!any_dying_threads) {

++total_non_dead;

idle_thread_count += idle_thread_addition;

}

}

ap_max_daemons_limit = last_non_dead + 1;

if (idle_thread_count > max_spare_threads) {

/* Kill off one child */

char char_of_death = '!';

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

ap_log_error(APLOG_MARK, APLOG_WARNING, rv, ap_server_conf, "write pipe_of_death");

}

idle_spawn_rate = 1;

}

else if (idle_thread_count < min_spare_threads) {

/* terminate the free list */

if (free_length == 0) {

/* only report this condition once */

static int reported = 0;

if (!reported) {

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

"server seems busy, (you may need "

"to increase StartServers, ThreadsPerChild "

"or Min/MaxSpareThreads), "

"spawning %d children, there are around %d idle "

"threads, and %d total children", idle_spawn_rate,

idle_thread_count, total_non_dead);

}

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 (idle_spawn_rate < MAX_SPAWN_RATE) {

idle_spawn_rate *= 2;

}

}

}

else {

idle_spawn_rate = 1;

}

}

static void server_main_loop(int remaining_children_to_start)

{

int child_slot;

apr_wait_t status;

apr_proc_t pid;

int i;

while (!restart_pending && !shutdown_pending) {

ap_wait_or_timeout(&status, &pid, pconf);

if (pid.pid != -1) {

ap_process_child_status(&pid, status);

/* non-fatal death... note that it's gone in the scoreboard. */

child_slot = find_child_by_pid(&pid);

if (child_slot >= 0) {

for (i = 0; i < ap_threads_per_child; i++)

ap_update_child_status(child_slot, i, SERVER_DEAD, (request_rec *) NULL);

if (remaining_children_to_start

&& child_slot < ap_daemons_limit) {

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

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

--remaining_children_to_start;

}

#if APR_HAS_OTHER_CHILD

}

else if (apr_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

startup_children(remaining_children_to_start);

remaining_children_to_start = 0;

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

continue;

}

perform_idle_server_maintenance();

}

}

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

{

int remaining_children_to_start;

apr_status_t rv;

apr_size_t one = 1;

pconf = _pconf;

ap_server_conf = s;

rv = apr_create_pipe(&pipe_of_death_in, &pipe_of_death_out, pconf);

if (rv != APR_SUCCESS) {

ap_log_error(APLOG_MARK, APLOG_ERR, rv,

(const server_rec*) ap_server_conf,

"apr_create_pipe (pipe_of_death)");

exit(1);

}

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

ap_log_error(APLOG_MARK, APLOG_ERR, rv,

(const server_rec*) ap_server_conf,

"apr_set_pipe_timeout (pipe_of_death)");

exit(1);

}

ap_server_conf = s;

if ((num_listensocks = ap_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 = apr_psprintf(_pconf, "%s.%u",

ap_server_root_relative(_pconf, lock_fname),

ap_my_pid);

rv = apr_create_lock(&accept_mutex, APR_MUTEX, APR_LOCKALL,

lock_fname, _pconf);

if (rv != APR_SUCCESS) {

ap_log_error(APLOG_MARK, APLOG_EMERG, rv, s,

"Couldn't create accept lock");

return 1;

}

if (!is_graceful) {

reinit_scoreboard(pconf);

}

set_signals();

/* Don't thrash... */

if (max_spare_threads < min_spare_threads + ap_threads_per_child)

max_spare_threads = min_spare_threads + ap_threads_per_child;

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

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

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 */

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

++ap_my_generation;

ap_scoreboard_image->global.running_generation = ap_my_generation;

update_scoreboard_global();

if (is_graceful) {

int i, j;

char char_of_death = '!';

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

"SIGWINCH received. Doing graceful restart");

/* give the children the signal to die */

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

if ((rv = apr_write(pipe_of_death_in, &char_of_death, &one)) != APR_SUCCESS) {

if (APR_STATUS_IS_EINTR(rv)) continue;

ap_log_error(APLOG_MARK, APLOG_WARNING, rv, ap_server_conf, "write pipe_of_death");

}

i++;

}

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

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

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

if (ap_scoreboard_image->servers[i][j].status != SERVER_DEAD) {

ap_scoreboard_image->servers[i][j].status = SERVER_GRACEFUL;

}

}

}

}

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");

}

if (!is_graceful) {

ap_restart_time = apr_now();

}

return 0;

}

static void mpmt_pthread_pre_config(apr_pool_t *pconf, apr_pool_t *plog, apr_pool_t *ptemp)

{

static int restart_num = 0;

int no_detach = 0;

one_process = !!ap_exists_config_define("ONE_PROCESS");

no_detach = !!ap_exists_config_define("NO_DETACH");

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

if (restart_num++ == 1) {

is_graceful = 0;

if (!one_process && !no_detach) {

apr_detach();

}

ap_my_pid = getpid();

}

unixd_pre_config(ptemp);

ap_listen_pre_config();

ap_daemons_to_start = DEFAULT_START_DAEMON;

min_spare_threads = DEFAULT_MIN_FREE_DAEMON * DEFAULT_THREADS_PER_CHILD;

max_spare_threads = DEFAULT_MAX_FREE_DAEMON * DEFAULT_THREADS_PER_CHILD;

ap_daemons_limit = HARD_SERVER_LIMIT;

ap_threads_per_child = DEFAULT_THREADS_PER_CHILD;

ap_pid_fname = DEFAULT_PIDLOG;

ap_scoreboard_fname = DEFAULT_SCOREBOARD;

lock_fname = DEFAULT_LOCKFILE;

ap_max_requests_per_child = DEFAULT_MAX_REQUESTS_PER_CHILD;

ap_extended_status = 0;

apr_cpystrn(ap_coredump_dir, ap_server_root, sizeof(ap_coredump_dir));

}

static void mpmt_pthread_hooks(apr_pool_t *p)

{

INIT_SIGLIST()

one_process = 0;

ap_hook_pre_config(mpmt_pthread_pre_config, NULL, NULL, APR_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_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_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)

{

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

if (err != NULL) {

return err;

}

max_spare_threads = atoi(arg);

return NULL;

}

static const char *set_server_limit (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_limit = atoi(arg);

if (ap_daemons_limit > HARD_SERVER_LIMIT) {

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

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

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

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

" lowering MaxClients 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);

ap_daemons_limit = HARD_SERVER_LIMIT;

}

else if (ap_daemons_limit < 1) {

ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL, "WARNING: Require MaxClients > 0, setting to 1");

ap_daemons_limit = 1;

}

return NULL;

}

static const char *set_threads_per_child (cmd_parms *cmd, void *dummy,

const char *arg)

{

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

if (err != NULL) {

return err;

}

ap_threads_per_child = atoi(arg);

if (ap_threads_per_child > HARD_THREAD_LIMIT) {

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

"WARNING: ThreadsPerChild of %d exceeds compile time"

"limit of %d threads,", ap_threads_per_child,

HARD_THREAD_LIMIT);

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

" lowering ThreadsPerChild 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 (ap_threads_per_child < 1) {

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

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

ap_threads_per_child = 1;

}

return NULL;

}

static const char *set_max_requests(cmd_parms *cmd, void *dummy,

const char *arg)

{

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

if (err != NULL) {

return err;

}

ap_max_requests_per_child = atoi(arg);

return NULL;

}

static const char *set_coredumpdir (cmd_parms *cmd, void *dummy,

const char *arg)

{

apr_finfo_t finfo;

const char *fname;

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

if (err != NULL) {

return err;

}

fname = ap_server_root_relative(cmd->pool, arg);

if ((apr_stat(&finfo, fname, APR_FINFO_TYPE, cmd->pool) != APR_SUCCESS)

|| (finfo.filetype != APR_DIR)) {

return apr_pstrcat(cmd->pool, "CoreDumpDirectory ", fname,

" does not exist or is not a directory", NULL);