+++ /dev/null
-/* Licensed to the Apache Software Foundation (ASF) under one or more
- * contributor license agreements. See the NOTICE file distributed with
- * this work for additional information regarding copyright ownership.
- * The ASF licenses this file to You under the Apache License, Version 2.0
- * (the "License"); you may not use this file except in compliance with
- * the License. You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-#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" /* for get_remote_host */
-#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> /* for IRIX, FD_SET calls bzero() */
-#endif
-#ifdef HAVE_TIME_H
-#include <time.h>
-#endif
-#ifdef HAVE_SYS_PROCESSOR_H
-#include <sys/processor.h> /* for bindprocessor() */
-#endif
-
-#include <signal.h>
-#include <sys/times.h>
-
-/* Limit on the total --- clients will be locked out if more servers than
- * this are needed. It is intended solely to keep the server from crashing
- * when things get out of hand.
- *
- * We keep a hard maximum number of servers, for two reasons --- first off,
- * in case something goes seriously wrong, we want to stop the fork bomb
- * short of actually crashing the machine we're running on by filling some
- * kernel table. Secondly, it keeps the size of the scoreboard file small
- * enough that we can read the whole thing without worrying too much about
- * the overhead.
- */
-#ifndef DEFAULT_SERVER_LIMIT
-#define DEFAULT_SERVER_LIMIT 256
-#endif
-
-/* Admin can't tune ServerLimit beyond MAX_SERVER_LIMIT. We want
- * some sort of compile-time limit to help catch typos.
- */
-#ifndef MAX_SERVER_LIMIT
-#define MAX_SERVER_LIMIT 20000
-#endif
-
-#ifndef HARD_THREAD_LIMIT
-#define HARD_THREAD_LIMIT 1
-#endif
-
-/* config globals */
-
-int ap_threads_per_child=0; /* Worker threads per child */
-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; /* MaxClients */
-static int server_limit = DEFAULT_SERVER_LIMIT;
-static int first_server_limit;
-static int changed_limit_at_restart;
-static int mpm_state = AP_MPMQ_STARTING;
-static ap_pod_t *pod;
-
-/*
- * The max child slot ever assigned, preserved across restarts. Necessary
- * to deal with MaxClients changes across AP_SIG_GRACEFUL restarts. We
- * use this value to optimize routines that have to scan the entire scoreboard.
- */
-int ap_max_daemons_limit = -1;
-server_rec *ap_server_conf;
-
-/* one_process --- debugging mode variable; can be set from the command line
- * with the -X flag. If set, this gets you the child_main loop running
- * in the process which originally started up (no detach, no make_child),
- * which is a pretty nice debugging environment. (You'll get a SIGHUP
- * early in standalone_main; just continue through. This is the server
- * trying to kill off any child processes which it might have lying
- * around --- Apache doesn't keep track of their pids, it just sends
- * SIGHUP to the process group, ignoring it in the root process.
- * Continue through and you'll be fine.).
- */
-
-static int one_process = 0;
-
-static apr_pool_t *pconf; /* Pool for config stuff */
-static apr_pool_t *pchild; /* Pool for httpd child stuff */
-
-static pid_t ap_my_pid; /* it seems silly to call getpid all the time */
-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 /* TPF */
-
-static int die_now = 0;
-
-#ifdef GPROF
-/*
- * change directory for gprof to plop the gmon.out file
- * configure in httpd.conf:
- * GprofDir $RuntimeDir/ -> $ServerRoot/$RuntimeDir/gmon.out
- * GprofDir $RuntimeDir/% -> $ServerRoot/$RuntimeDir/gprof.$pid/gmon.out
- */
-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[512];
- int len = strlen(sconf->gprof_dir) - 1;
- if(*(dir + len) == '%') {
- dir[len] = '\0';
- apr_snprintf(buf, sizeof(buf), "%sgprof.%d", dir, (int)getpid());
- }
- use_dir = ap_server_root_relative(pconf, buf[0] ? buf : dir);
- res = apr_dir_make(use_dir, 0755, pconf);
- if(res != APR_SUCCESS && !APR_STATUS_IS_EEXIST(res)) {
- ap_log_error(APLOG_MARK, APLOG_ERR, errno, 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
-
-/* XXX - I don't know if TPF will ever use this module or not, so leave
- * the ap_check_signals calls in but disable them - manoj */
-#define ap_check_signals()
-
-/* a clean exit from a child with proper cleanup */
-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, msg);
- clean_child_exit(0);
- }
- else {
- ap_log_error(APLOG_MARK, APLOG_EMERG, rv, NULL, 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, msg);
- /* don't exit here... we have a connection to
- * process, after which point we'll see that the
- * generation changed and we'll exit cleanly
- */
- }
- else {
- ap_log_error(APLOG_MARK, APLOG_EMERG, rv, NULL, msg);
- exit(APEXIT_CHILDFATAL);
- }
- }
-}
-
-/* On some architectures it's safe to do unserialized accept()s in the single
- * Listen case. But it's never safe to do it in the case where there's
- * multiple Listen statements. Define SINGLE_LISTEN_UNSERIALIZED_ACCEPT
- * when it's safe in the single Listen case.
- */
-#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)
-/*
- Systems without a real waitpid sometimes lose a child's exit while waiting
- for another. Search through the scoreboard for missing children.
- */
-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);
- /* just mark it as having a successful exit status */
- *status = APR_PROC_EXIT;
- *exitcode = 0;
- return(pid);
- }
- }
- return 0;
-}
-#endif
-
-/*****************************************************************
- * Connection structures and accounting...
- */
-
-static void just_die(int sig)
-{
- clean_child_exit(0);
-}
-
-/* volatile just in case */
-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) {
- /* Um, is this _probably_ not an error, if the user has
- * tried to do a shutdown twice quickly, so we won't
- * worry about reporting it.
- */
- return;
- }
- shutdown_pending = 1;
-}
-
-/* restart() is the signal handler for SIGHUP and AP_SIG_GRACEFUL
- * in the parent process, unless running in ONE_PROCESS mode
- */
-static void restart(int sig)
-{
- if (restart_pending == 1) {
- /* Probably not an error - don't bother reporting it */
- return;
- }
- 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 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 AP_SIG_GRACEFUL while we're busy
- * processing one */
- 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 /* SIGXCPU */
-#ifdef SIGXFSZ
- apr_signal(SIGXFSZ, SIG_DFL);
-#endif /* SIGXFSZ */
- }
-
- apr_signal(SIGTERM, sig_term);
-#ifdef SIGHUP
- apr_signal(SIGHUP, restart);
-#endif /* SIGHUP */
-#ifdef AP_SIG_GRACEFUL
- apr_signal(AP_SIG_GRACEFUL, restart);
-#endif /* AP_SIG_GRACEFUL */
-#ifdef SIGPIPE
- apr_signal(SIGPIPE, SIG_IGN);
-#endif /* SIGPIPE */
-
-#endif
-}
-
-/*****************************************************************
- * Child process main loop.
- * The following vars are static to avoid getting clobbered by longjmp();
- * they are really private to child_main.
- */
-
-static int requests_this_child;
-static int num_listensocks = 0;
-static ap_listen_rec *listensocks;
-
-int ap_graceful_stop_signalled(void)
-{
- /* not ever called anymore... */
- return 0;
-}
-
-
-static void child_main(int child_num_arg)
-{
- apr_pool_t *ptrans;
- apr_allocator_t *allocator;
- conn_rec *current_conn;
- apr_status_t status = APR_EINIT;
- int i;
- ap_listen_rec *lr;
- int curr_pollfd, last_pollfd = 0;
- apr_pollfd_t *pollset;
- int offset;
- void *csd;
- ap_sb_handle_t *sbh;
- apr_status_t rv;
- apr_bucket_alloc_t *bucket_alloc;
-
- mpm_state = AP_MPMQ_STARTING; /* for benefit of any hooks that run as this
- * child initializes
- */
-
- my_child_num = child_num_arg;
- ap_my_pid = getpid();
- csd = NULL;
- requests_this_child = 0;
-
- ap_fatal_signal_child_setup(ap_server_conf);
-
- /* Get a sub context for global allocations in this child, so that
- * we can have cleanups occur when the child exits.
- */
- 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");
-
- /* needs to be done before we switch UIDs so we have permissions */
- ap_reopen_scoreboard(pchild, NULL, 0);
- rv = apr_proc_mutex_child_init(&accept_mutex, ap_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_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);
-
- /* Set up the pollfd array */
- listensocks = apr_pcalloc(pchild,
- sizeof(*listensocks) * (num_listensocks));
- for (lr = ap_listeners, i = 0; i < num_listensocks; lr = lr->next, i++) {
- listensocks[i].accept_func = lr->accept_func;
- listensocks[i].sd = lr->sd;
- }
-
- pollset = apr_palloc(pchild, sizeof(*pollset) * num_listensocks);
- pollset[0].p = pchild;
- for (i = 0; i < num_listensocks; i++) {
- pollset[i].desc.s = listensocks[i].sd;
- pollset[i].desc_type = APR_POLL_SOCKET;
- pollset[i].reqevents = APR_POLLIN;
- }
-
- mpm_state = AP_MPMQ_RUNNING;
-
- bucket_alloc = apr_bucket_alloc_create(pchild);
-
- while (!die_now) {
- /*
- * (Re)initialize this child to a pre-connection state.
- */
-
- current_conn = NULL;
-
- 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);
-
- /*
- * Wait for an acceptable connection to arrive.
- */
-
- /* Lock around "accept", if necessary */
- SAFE_ACCEPT(accept_mutex_on());
-
- if (num_listensocks == 1) {
- offset = 0;
- }
- else {
- /* multiple listening sockets - need to poll */
- for (;;) {
- apr_status_t ret;
- apr_int32_t n;
-
- ret = apr_poll(pollset, num_listensocks, &n, -1);
- if (ret != APR_SUCCESS) {
- if (APR_STATUS_IS_EINTR(ret)) {
- continue;
- }
- /* Single Unix documents select as returning errnos
- * EBADF, EINTR, and EINVAL... and in none of those
- * cases does it make sense to continue. In fact
- * on Linux 2.0.x we seem to end up with EFAULT
- * occasionally, and we'd loop forever due to it.
- */
- ap_log_error(APLOG_MARK, APLOG_ERR, ret, ap_server_conf,
- "apr_poll: (listen)");
- clean_child_exit(1);
- }
- /* find a listener */
- curr_pollfd = last_pollfd;
- do {
- curr_pollfd++;
- if (curr_pollfd >= num_listensocks) {
- curr_pollfd = 0;
- }
- /* XXX: Should we check for POLLERR? */
- if (pollset[curr_pollfd].rtnevents & APR_POLLIN) {
- last_pollfd = curr_pollfd;
- offset = curr_pollfd;
- goto got_fd;
- }
- } while (curr_pollfd != last_pollfd);
-
- continue;
- }
- }
- got_fd:
- /* if we accept() something we don't want to die, so we have to
- * defer the exit
- */
- status = listensocks[offset].accept_func(&csd,
- &listensocks[offset], ptrans);
- SAFE_ACCEPT(accept_mutex_off()); /* unlock after "accept" */
-
- if (status == APR_EGENERAL) {
- /* resource shortage or should-not-occur occured */
- clean_child_exit(1);
- }
- else if (status != APR_SUCCESS) {
- continue;
- }
-
- /*
- * We now have a connection, so set it up with the appropriate
- * socket options, file descriptors, and read/write buffers.
- */
-
- 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);
- }
-
- /* Check the pod and the generation number after processing a
- * connection so that we'll go away if a graceful restart occurred
- * while we were processing the connection or we are the lucky
- * idle server process that gets to die.
- */
- if (ap_mpm_pod_check(pod) == APR_SUCCESS) { /* selected as idle? */
- die_now = 1;
- }
- else if (ap_my_generation !=
- ap_scoreboard_image->global->running_generation) { /* restart? */
- /* yeah, this could be non-graceful restart, in which case the
- * parent will kill us soon enough, but why bother checking?
- */
- die_now = 1;
- }
- }
- 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, just_die);
- /* Don't catch AP_SIG_GRACEFUL in ONE_PROCESS mode :) */
- apr_signal(SIGINT, just_die);
-#ifdef SIGQUIT
- apr_signal(SIGQUIT, SIG_DFL);
-#endif
- apr_signal(SIGTERM, just_die);
- child_main(slot);
- }
-
- (void) ap_update_child_status_from_indexes(slot, 0, SERVER_STARTING,
- (request_rec *) NULL);
-
-
-#ifdef _OSD_POSIX
- /* BS2000 requires a "special" version of fork() before a setuid() call */
- 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");
-
- /* fork didn't succeed. Fix the scoreboard or else
- * it will say SERVER_STARTING forever and ever
- */
- (void) ap_update_child_status_from_indexes(slot, 0, SERVER_DEAD,
- (request_rec *) NULL);
-
- /* In case system resources are maxxed out, we don't want
- Apache running away with the CPU trying to fork over and
- over and over again. */
- sleep(10);
-
- return -1;
- }
-
- if (!pid) {
-#ifdef HAVE_BINDPROCESSOR
- /* by default AIX binds to a single processor
- * this bit unbinds children which will then bind to another cpu
- */
- 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);
- /* Disable the parent's signal handlers and set up proper handling in
- * the child.
- */
- apr_signal(SIGHUP, just_die);
- apr_signal(SIGTERM, just_die);
- /* The child process doesn't do anything for AP_SIG_GRACEFUL.
- * Instead, the pod is used for signalling graceful restart.
- */
- apr_signal(AP_SIG_GRACEFUL, SIG_IGN);
- child_main(slot);
- }
-
- ap_scoreboard_image->parent[slot].pid = pid;
-
- return 0;
-}
-
-
-/* start up a bunch of children */
-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;
- }
-}
-
-
-/*
- * idle_spawn_rate is the number of children that will be spawned on the
- * next maintenance cycle if there aren't enough idle servers. It is
- * doubled up to MAX_SPAWN_RATE, and reset only when a cycle goes by
- * without the need to spawn.
- */
-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;
-
- /* initialize the free_list */
- 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) {
- /* try to keep children numbers as low as possible */
- if (free_length < idle_spawn_rate) {
- free_slots[free_length] = i;
- ++free_length;
- }
- }
- else {
- /* We consider a starting server as idle because we started it
- * at least a cycle ago, and if it still hasn't finished starting
- * then we're just going to swamp things worse by forking more.
- * So we hopefully won't need to fork more if we count it.
- * This depends on the ordering of SERVER_READY and SERVER_STARTING.
- */
- if (status <= SERVER_READY) {
- ++ idle_count;
- /* always kill the highest numbered child if we have to...
- * no really well thought out reason ... other than observing
- * the server behaviour under linux where lower numbered children
- * tend to service more hits (and hence are more likely to have
- * their data in cpu caches).
- */
- 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) {
- /* kill off one child... we use the pod because that'll cause it to
- * shut down gracefully, in case it happened to pick up a request
- * while we were counting
- */
- ap_mpm_pod_signal(pod);
- idle_spawn_rate = 1;
- }
- else if (idle_count < ap_daemons_min_free) {
- /* 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_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 /* TPF */
- }
- /* the next time around we want to spawn twice as many if this
- * wasn't good enough, but not if we've just done a graceful
- */
- 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;
- }
-}
-
-/*****************************************************************
- * Executive routines.
- */
-
-int ap_mpm_run(apr_pool_t *_pconf, apr_pool_t *plog, server_rec *s)
-{
- int index;
- int remaining_children_to_start;
- apr_status_t rv;
-
- ap_log_pid(pconf, ap_pid_fname);
-
- first_server_limit = server_limit;
- if (changed_limit_at_restart) {
- ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s,
- "WARNING: Attempt to change ServerLimit "
- "ignored during restart");
- changed_limit_at_restart = 0;
- }
-
- /* Initialize cross-process accept lock */
- ap_lock_fname = apr_psprintf(_pconf, "%s.%" APR_PID_T_FMT,
- ap_server_root_relative(_pconf, ap_lock_fname),
- ap_my_pid);
-
- rv = apr_proc_mutex_create(&accept_mutex, ap_lock_fname,
- ap_accept_lock_mech, _pconf);
- if (rv != APR_SUCCESS) {
- ap_log_error(APLOG_MARK, APLOG_EMERG, rv, s,
- "Couldn't create accept lock");
- mpm_state = AP_MPMQ_STOPPING;
- return 1;
- }
-
-#if APR_USE_SYSVSEM_SERIALIZE
- if (ap_accept_lock_mech == APR_LOCK_DEFAULT ||
- ap_accept_lock_mech == APR_LOCK_SYSVSEM) {
-#else
- if (ap_accept_lock_mech == APR_LOCK_SYSVSEM) {
-#endif
- rv = unixd_set_proc_mutex_perms(accept_mutex);
- if (rv != APR_SUCCESS) {
- ap_log_error(APLOG_MARK, APLOG_EMERG, rv, s,
- "Couldn't set permissions on cross-process lock; "
- "check User and Group directives");
- mpm_state = AP_MPMQ_STOPPING;
- return 1;
- }
- }
-
- if (!is_graceful) {
- if (ap_run_pre_mpm(s->process->pool, SB_SHARED) != OK) {
- mpm_state = AP_MPMQ_STOPPING;
- return 1;
- }
- /* fix the generation number in the global score; we just got a new,
- * cleared scoreboard
- */
- ap_scoreboard_image->global->running_generation = ap_my_generation;
- }
-
- set_signals();
-
- if (one_process) {
- AP_MONCONTROL(1);
- }
-
- if (ap_daemons_max_free < ap_daemons_min_free + 1) /* Don't thrash... */
- ap_daemons_max_free = ap_daemons_min_free + 1;
-
- /* If we're doing a graceful_restart then we're going to see a lot
- * of children exiting immediately when we get into the main loop
- * below (because we just sent them AP_SIG_GRACEFUL). This happens pretty
- * rapidly... and for each one that exits we'll start a new one until
- * we reach at least daemons_min_free. But we may be permitted to
- * start more than that, so we'll just keep track of how many we're
- * supposed to start up without the 1 second penalty between each fork.
- */
- remaining_children_to_start = ap_daemons_to_start;
- if (remaining_children_to_start > ap_daemons_limit) {
- remaining_children_to_start = ap_daemons_limit;
- }
- if (!is_graceful) {
- startup_children(remaining_children_to_start);
- remaining_children_to_start = 0;
- }
- else {
- /* give the system some time to recover before kicking into
- * exponential mode */
- hold_off_on_exponential_spawning = 10;
- }
-
- ap_log_error(APLOG_MARK, APLOG_NOTICE, 0, ap_server_conf,
- "%s configured -- resuming normal operations",
- ap_get_server_version());
- ap_log_error(APLOG_MARK, APLOG_INFO, 0, ap_server_conf,
- "Server built: %s", ap_get_server_built());
-#ifdef AP_MPM_WANT_SET_ACCEPT_LOCK_MECH
- ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, ap_server_conf,
- "AcceptMutex: %s (default: %s)",
- apr_proc_mutex_name(accept_mutex),
- apr_proc_mutex_defname());
-#endif
- restart_pending = shutdown_pending = 0;
-
- mpm_state = AP_MPMQ_RUNNING;
-
- while (!restart_pending && !shutdown_pending) {
- int child_slot;
- apr_exit_why_e exitwhy;
- int status, processed_status;
- /* this is a memory leak, but I'll fix it later. */
- apr_proc_t pid;
-
- ap_wait_or_timeout(&exitwhy, &status, &pid, pconf);
-
- /* XXX: if it takes longer than 1 second for all our children
- * to start up and get into IDLE state then we may spawn an
- * extra child
- */
- if (pid.pid != -1) {
- processed_status = ap_process_child_status(&pid, exitwhy, status);
- if (processed_status == APEXIT_CHILDFATAL) {
- mpm_state = AP_MPMQ_STOPPING;
- return 1;
- }
-
- /* non-fatal death... note that it's gone in the scoreboard. */
- child_slot = find_child_by_pid(&pid);
- if (child_slot >= 0) {
- (void) ap_update_child_status_from_indexes(child_slot, 0, SERVER_DEAD,
- (request_rec *) NULL);
- if (processed_status == APEXIT_CHILDSICK) {
- /* child detected a resource shortage (E[NM]FILE, ENOBUFS, etc)
- * cut the fork rate to the minimum
- */
- idle_spawn_rate = 1;
- }
- else if (remaining_children_to_start
- && child_slot < ap_daemons_limit) {
- /* we're still doing a 1-for-1 replacement of dead
- * children with new children
- */
- make_child(ap_server_conf, child_slot);
- --remaining_children_to_start;
- }
-#if APR_HAS_OTHER_CHILD
- }
- else if (apr_proc_other_child_read(&pid, status) == 0) {
- /* handled */
-#endif
- }
- else if (is_graceful) {
- /* Great, we've probably just lost a slot in the
- * scoreboard. Somehow we don't know about this
- * child.
- */
- ap_log_error(APLOG_MARK, APLOG_WARNING,
- 0, ap_server_conf,
- "long lost child came home! (pid %ld)", (long)pid.pid);
- }
- /* Don't perform idle maintenance when a child dies,
- * only do it when there's a timeout. Remember only a
- * finite number of children can die, and it's pretty
- * pathological for a lot to die suddenly.
- */
- continue;
- }
- else if (remaining_children_to_start) {
- /* we hit a 1 second timeout in which none of the previous
- * generation of children needed to be reaped... so assume
- * they're all done, and pick up the slack if any is left.
- */
- startup_children(remaining_children_to_start);
- remaining_children_to_start = 0;
- /* In any event we really shouldn't do the code below because
- * few of the servers we just started are in the IDLE state
- * yet, so we'd mistakenly create an extra server.
- */
- continue;
- }
-
- perform_idle_server_maintenance(pconf);
-#ifdef TPF
- shutdown_pending = os_check_server(tpf_server_name);
- ap_check_signals();
- sleep(1);
-#endif /*TPF */
- }
-
- mpm_state = AP_MPMQ_STOPPING;
-
- if (shutdown_pending) {
- /* Time to gracefully shut down:
- * Kill child processes, tell them to call child_exit, etc...
- */
- if (unixd_killpg(getpgrp(), SIGTERM) < 0) {
- ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, "killpg SIGTERM");
- }
- ap_reclaim_child_processes(1); /* Start with SIGTERM */
-
- /* cleanup pid file on normal shutdown */
- {
- const char *pidfile = NULL;
- pidfile = ap_server_root_relative (pconf, ap_pid_fname);
- if ( pidfile != NULL && unlink(pidfile) == 0)
- ap_log_error(APLOG_MARK, APLOG_INFO,
- 0, ap_server_conf,
- "removed PID file %s (pid=%ld)",
- pidfile, (long)getpid());
- }
-
- ap_log_error(APLOG_MARK, APLOG_NOTICE, 0, ap_server_conf,
- "caught SIGTERM, shutting down");
- return 1;
- }
-
- /* we've been told to restart */
- apr_signal(SIGHUP, SIG_IGN);
- if (one_process) {
- /* not worth thinking about */
- return 1;
- }
-
- /* advance to the next generation */
- /* XXX: we really need to make sure this new generation number isn't in
- * use by any of the children.
- */
- ++ap_my_generation;
- ap_scoreboard_image->global->running_generation = ap_my_generation;
-
- if (is_graceful) {
- ap_log_error(APLOG_MARK, APLOG_NOTICE, 0, ap_server_conf,
- "Graceful restart requested, doing restart");
-
- /* kill off the idle ones */
- ap_mpm_pod_killpg(pod, ap_max_daemons_limit);
-
- /* This is mostly for debugging... so that we know what is still
- * gracefully dealing with existing request. This will break
- * in a very nasty way if we ever have the scoreboard totally
- * file-based (no shared memory)
- */
- for (index = 0; index < ap_daemons_limit; ++index) {
- if (ap_scoreboard_image->servers[index][0].status != SERVER_DEAD) {
- ap_scoreboard_image->servers[index][0].status = SERVER_GRACEFUL;
- }
- }
- }
- else {
- /* Kill 'em off */
- if (unixd_killpg(getpgrp(), SIGHUP) < 0) {
- ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, "killpg SIGHUP");
- }
- ap_reclaim_child_processes(0); /* Not when just starting up */
- ap_log_error(APLOG_MARK, APLOG_NOTICE, 0, ap_server_conf,
- "SIGHUP received. Attempting to restart");
- }
-
- return 0;
-}
-
-/* This really should be a post_config hook, but the error log is already
- * redirected by that point, so we need to do this in the open_logs phase.
- */
-static int prefork_open_logs(apr_pool_t *p, apr_pool_t *plog, apr_pool_t *ptemp, server_rec *s)
-{
- apr_status_t rv;
-
- pconf = p;
- ap_server_conf = s;
-
- if ((num_listensocks = ap_setup_listeners(ap_server_conf)) < 1) {
- ap_log_error(APLOG_MARK, APLOG_ALERT|APLOG_STARTUP, 0,
- NULL, "no listening sockets available, shutting down");
- return DONE;
- }
-
- if ((rv = ap_mpm_pod_open(pconf, &pod))) {
- ap_log_error(APLOG_MARK, APLOG_CRIT|APLOG_STARTUP, rv, NULL,
- "Could not open pipe-of-death.");
- return DONE;
- }
- return OK;
-}
-
-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");
- }
-
- /* sigh, want this only the second time around */
- 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)
-{
- /* The prefork open_logs phase must run before the core's, or stderr
- * will be redirected to a file, and the messages won't print to the
- * console.
- */
- 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);
- /* we need to set the MPM state before other pre-config hooks use MPM query
- * to retrieve it, so register as REALLY_FIRST
- */
- 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;
-}
-
-static const char *set_max_clients (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 > 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);
- /* you cannot change ServerLimit across a restart; ignore
- * any such attempts
- */
- if (first_server_limit &&
- tmp_server_limit != server_limit) {
- /* how do we log a message? the error log is a bit bucket at this
- * point; we'll just have to set a flag so that ap_mpm_run()
- * logs a warning later
- */
- 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"),
-{ NULL }
-};
-
-module AP_MODULE_DECLARE_DATA mpm_prefork_module = {
- MPM20_MODULE_STUFF,
- ap_mpm_rewrite_args, /* hook to run before apache parses args */
- NULL, /* create per-directory config structure */
- NULL, /* merge per-directory config structures */
- NULL, /* create per-server config structure */
- NULL, /* merge per-server config structures */
- prefork_cmds, /* command apr_table_t */
- prefork_hooks, /* register hooks */
-};
Code Review / bottlenecks.git / blobdiff