+++ /dev/null
-/* ====================================================================
- * The Apache Software License, Version 1.1
- *
- * Copyright (c) 2000-2002 The Apache Software Foundation. All rights
- * reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- *
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in
- * the documentation and/or other materials provided with the
- * distribution.
- *
- * 3. The end-user documentation included with the redistribution,
- * if any, must include the following acknowledgment:
- * "This product includes software developed by the
- * Apache Software Foundation (http://www.apache.org/)."
- * Alternately, this acknowledgment may appear in the software itself,
- * if and wherever such third-party acknowledgments normally appear.
- *
- * 4. The names "Apache" and "Apache Software Foundation" must
- * not be used to endorse or promote products derived from this
- * software without prior written permission. For written
- * permission, please contact apache@apache.org.
- *
- * 5. Products derived from this software may not be called "Apache",
- * nor may "Apache" appear in their name, without prior written
- * permission of the Apache Software Foundation.
- *
- * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
- * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
- * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
- * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
- * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
- * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
- * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
- * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
- * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
- * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- * ====================================================================
- *
- * This software consists of voluntary contributions made by many
- * individuals on behalf of the Apache Software Foundation. For more
- * information on the Apache Software Foundation, please see
- * <http://www.apache.org/>.
- *
- * Portions of this software are based upon public domain software
- * originally written at the National Center for Supercomputing Applications,
- * University of Illinois, Urbana-Champaign.
- */
-
-#include "apr_hash.h"
-#include "apr_strings.h"
-#include "apr_pools.h"
-#include "apr_portable.h"
-#include "apr_file_io.h"
-#include "apr_signal.h"
-
-#define APR_WANT_IOVEC
-#include "apr_want.h"
-
-#if APR_HAVE_UNISTD_H
-#include <unistd.h>
-#endif
-#if APR_HAVE_SYS_SOCKET_H
-#include <sys/socket.h>
-#endif
-
-#if !APR_HAS_THREADS
-#error The perchild MPM requires APR threads, but they are unavailable.
-#endif
-
-#define CORE_PRIVATE
-
-#include "ap_config.h"
-#include "httpd.h"
-#include "http_main.h"
-#include "http_log.h"
-#include "http_config.h" /* for read_config */
-#include "http_core.h" /* for get_remote_host */
-#include "http_protocol.h"
-#include "http_connection.h"
-#include "ap_mpm.h"
-#include "unixd.h"
-#include "mpm_common.h"
-#include "ap_listen.h"
-#include "mpm_default.h"
-#include "mpm.h"
-#include "scoreboard.h"
-#include "util_filter.h"
-
-/* ### should be APR-ized */
-#include <poll.h>
-#include <grp.h>
-#include <pwd.h>
-#include <sys/stat.h>
-#include <sys/un.h>
-#include <setjmp.h>
-#ifdef HAVE_SYS_PROCESSOR_H
-#include <sys/processor.h> /* for bindprocessor() */
-#endif
-
-/*
- * Define some magic numbers that we use for the state of the incomming
- * request. These must be < 0 so they don't collide with a file descriptor.
- */
-#define AP_PERCHILD_THISCHILD -1
-#define AP_PERCHILD_OTHERCHILD -2
-
-/* Limit on the threads per process. Clients will be locked out if more than
- * this * server_limit are needed.
- *
- * We keep this for one reason 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_THREAD_LIMIT
-#define DEFAULT_THREAD_LIMIT 64
-#endif
-
-/* Admin can't tune ThreadLimit beyond MAX_THREAD_LIMIT. We want
- * some sort of compile-time limit to help catch typos.
- */
-#ifndef MAX_THREAD_LIMIT
-#define MAX_THREAD_LIMIT 20000
-#endif
-
-/* 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 8
-#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
-
-/*
- * Actual definitions of config globals
- */
-
-static int threads_to_start = 0; /* Worker threads per child */
-static int min_spare_threads = 0;
-static int max_spare_threads = 0;
-static int max_threads = 0;
-static int server_limit = DEFAULT_SERVER_LIMIT;
-static int first_server_limit;
-static int thread_limit = DEFAULT_THREAD_LIMIT;
-static int first_thread_limit;
-static int changed_limit_at_restart;
-static int num_daemons = 0;
-static int curr_child_num = 0;
-static int workers_may_exit = 0;
-static int requests_this_child;
-static int num_listensocks = 0;
-static ap_pod_t *pod;
-static jmp_buf jmpbuffer;
-
-struct child_info_t {
- uid_t uid;
- gid_t gid;
- int sd;
-};
-
-typedef struct {
- const char *sockname; /* The base name for the socket */
- const char *fullsockname; /* socket base name + extension */
- int sd; /* The socket descriptor */
- int sd2; /* The socket descriptor */
-} perchild_server_conf;
-
-typedef struct child_info_t child_info_t;
-
-/* Tables used to determine the user and group each child process should
- * run as. The hash table is used to correlate a server name with a child
- * process.
- */
-static child_info_t *child_info_table;
-static int *thread_socket_table;
-struct ap_ctable *ap_child_table;
-
-/*
- * The max child slot ever assigned, preserved across restarts. Necessary
- * to deal with NumServers changes across AP_SIG_GRACEFUL restarts. We
- * use this value to optimize routines that have to scan the entire child
- * table.
- *
- * XXX - It might not be worth keeping this code in. There aren't very
- * many child processes in this MPM.
- */
-int ap_max_daemons_limit = -1;
-int ap_threads_per_child; /* XXX not part of API! axe it! */
-
-module AP_MODULE_DECLARE_DATA mpm_perchild_module;
-
-static apr_file_t *pipe_of_death_in = NULL;
-static apr_file_t *pipe_of_death_out = NULL;
-static apr_thread_mutex_t *pipe_of_death_mutex;
-
-/* *Non*-shared http_main globals... */
-
-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;
-
-#ifdef DEBUG_SIGSTOP
-int raise_sigstop_flags;
-#endif
-
-static apr_pool_t *pconf; /* Pool for config stuff */
-static apr_pool_t *pchild; /* Pool for httpd child stuff */
-static apr_pool_t *thread_pool_parent; /* Parent of per-thread pools */
-static apr_thread_mutex_t *thread_pool_parent_mutex;
-
-static int child_num;
-static unsigned int my_pid; /* Linux getpid() doesn't work except in
- main thread. Use this instead */
-/* Keep track of the number of worker threads currently active */
-static int worker_thread_count;
-static apr_thread_mutex_t *worker_thread_count_mutex;
-static int *worker_thread_free_ids;
-static apr_threadattr_t *worker_thread_attr;
-
-/* Keep track of the number of idle worker threads */
-static int idle_thread_count;
-static apr_thread_mutex_t *idle_thread_count_mutex;
-
-/* Locks for accept serialization */
-#ifdef NO_SERIALIZED_ACCEPT
-#define SAFE_ACCEPT(stmt) APR_SUCCESS
-#else
-#define SAFE_ACCEPT(stmt) (stmt)
-static apr_proc_mutex_t *process_accept_mutex;
-#endif /* NO_SERIALIZED_ACCEPT */
-static apr_thread_mutex_t *thread_accept_mutex;
-
-AP_DECLARE(apr_status_t) ap_mpm_query(int query_code, int *result)
-{
- switch(query_code){
- case AP_MPMQ_MAX_DAEMON_USED:
- *result = ap_max_daemons_limit;
- return APR_SUCCESS;
- case AP_MPMQ_IS_THREADED:
- *result = AP_MPMQ_DYNAMIC;
- return APR_SUCCESS;
- case AP_MPMQ_IS_FORKED:
- *result = AP_MPMQ_STATIC;
- return APR_SUCCESS;
- case AP_MPMQ_HARD_LIMIT_DAEMONS:
- *result = server_limit;
- return APR_SUCCESS;
- case AP_MPMQ_HARD_LIMIT_THREADS:
- *result = thread_limit;
- return APR_SUCCESS;
- case AP_MPMQ_MAX_THREADS:
- *result = max_threads;
- return APR_SUCCESS;
- case AP_MPMQ_MIN_SPARE_DAEMONS:
- *result = 0;
- return APR_SUCCESS;
- case AP_MPMQ_MIN_SPARE_THREADS:
- *result = min_spare_threads;
- return APR_SUCCESS;
- case AP_MPMQ_MAX_SPARE_DAEMONS:
- *result = 0;
- return APR_SUCCESS;
- case AP_MPMQ_MAX_SPARE_THREADS:
- *result = max_spare_threads;
- return APR_SUCCESS;
- case AP_MPMQ_MAX_REQUESTS_DAEMON:
- *result = ap_max_requests_per_child;
- return APR_SUCCESS;
- case AP_MPMQ_MAX_DAEMONS:
- *result = num_daemons;
- return APR_SUCCESS;
- }
- return APR_ENOTIMPL;
-}
-
-/* a clean exit from a child with proper cleanup */
-static void clean_child_exit(int code)
-{
- if (pchild) {
- apr_pool_destroy(pchild);
- }
- exit(code);
-}
-
-/* handle all varieties of core dumping signals */
-static void sig_coredump(int sig)
-{
- chdir(ap_coredump_dir);
- apr_signal(sig, SIG_DFL);
- kill(getpid(), sig);
- /* At this point we've got sig blocked, because we're still inside
- * the signal handler. When we leave the signal handler it will
- * be unblocked, and we'll take the signal... and coredump or whatever
- * is appropriate for this particular Unix. In addition the parent
- * will see the real signal we received -- whereas if we called
- * abort() here, the parent would only see SIGABRT.
- */
-}
-
-static void just_die(int sig)
-{
- clean_child_exit(0);
-}
-
-/*****************************************************************
- * Connection structures and accounting...
- */
-
-/* volatile just in case */
-static int volatile shutdown_pending;
-static int volatile restart_pending;
-static int volatile is_graceful;
-static int volatile child_fatal;
-/* we don't currently track ap_my_generation, but mod_status
- * references it so it must be defined */
-ap_generation_t volatile ap_my_generation=0;
-
-/*
- * ap_start_shutdown() and ap_start_restart(), below, are a first stab at
- * functions to initiate shutdown or restart without relying on signals.
- * Previously this was initiated in sig_term() and restart() signal handlers,
- * but we want to be able to start a shutdown/restart from other sources --
- * e.g. on Win32, from the service manager. Now the service manager can
- * call ap_start_shutdown() or ap_start_restart() as appropiate. Note that
- * these functions can also be called by the child processes, since global
- * variables are no longer used to pass on the required action to the parent.
- *
- * These should only be called from the parent process itself, since the
- * parent process will use the shutdown_pending and restart_pending variables
- * to determine whether to shutdown or restart. The child process should
- * call signal_parent() directly to tell the parent to die -- this will
- * cause neither of those variable to be set, which the parent will
- * assume means something serious is wrong (which it will be, for the
- * child to force an exit) and so do an exit anyway.
- */
-
-static void ap_start_shutdown(void)
-{
- 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;
-}
-
-/* do a graceful restart if graceful == 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;
-}
-
-static void sig_term(int sig)
-{
- ap_start_shutdown();
-}
-
-static void restart(int sig)
-{
-#ifndef WIN32
- ap_start_restart(sig == AP_SIG_GRACEFUL);
-#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 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) {
- 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 AP_SIG_GRACEFUL
- apr_signal(AP_SIG_GRACEFUL, restart);
-#endif /* AP_SIG_GRACEFUL */
-#ifdef SIGPIPE
- apr_signal(SIGPIPE, SIG_IGN);
-#endif /* SIGPIPE */
-
-#endif
-}
-
-/*****************************************************************
- * Here follows a long bunch of generic server bookkeeping stuff...
- */
-
-int ap_graceful_stop_signalled(void)
-{
- /* XXX - Does this really work? - Manoj */
- return is_graceful;
-}
-
-/*****************************************************************
- * Child process main loop.
- */
-
-static void process_socket(apr_pool_t *p, apr_socket_t *sock, long conn_id,
- apr_bucket_alloc_t *bucket_alloc)
-{
- conn_rec *current_conn;
- int csd;
- apr_status_t rv;
- int thread_num = conn_id % thread_limit;
- ap_sb_handle_t *sbh;
-
- if ((rv = apr_os_sock_get(&csd, sock)) != APR_SUCCESS) {
- ap_log_error(APLOG_MARK, APLOG_ERR, rv, NULL, "apr_os_sock_get");
- }
-
- 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_socket_close(sock);
- return;
- }
-
- if (thread_socket_table[thread_num] < 0) {
- ap_sock_disable_nagle(sock);
- }
-
- ap_create_sb_handle(&sbh, p, conn_id / thread_limit, thread_num);
- current_conn = ap_run_create_connection(p, ap_server_conf, sock, conn_id,
- sbh, bucket_alloc);
- if (current_conn) {
- ap_process_connection(current_conn, sock);
- ap_lingering_close(current_conn);
- }
-}
-
-static void *worker_thread(apr_thread_t *, void *);
-
-/* Starts a thread as long as we're below max_threads */
-static int start_thread(void)
-{
- apr_thread_t *thread;
- int rc;
-
- apr_thread_mutex_lock(worker_thread_count_mutex);
- if (worker_thread_count < max_threads - 1) {
- rc = apr_thread_create(&thread, worker_thread_attr, worker_thread,
- &worker_thread_free_ids[worker_thread_count], pchild);
- if (rc != APR_SUCCESS) {
- ap_log_error(APLOG_MARK, APLOG_ALERT, rc, ap_server_conf,
- "apr_thread_create: unable to create worker thread");
- /* 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 if we exit. */
- sleep(10);
- workers_may_exit = 1;
- apr_thread_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;
- }
- apr_thread_mutex_unlock(worker_thread_count_mutex);
- return 0;
- }
- apr_thread_mutex_unlock(worker_thread_count_mutex);
- return 1;
-
-}
-
-/* Sets workers_may_exit if we received a character on the pipe_of_death */
-static apr_status_t check_pipe_of_death(void **csd, ap_listen_rec *lr,
- apr_pool_t *ptrans)
-{
- apr_thread_mutex_lock(pipe_of_death_mutex);
- if (!workers_may_exit) {
- int ret;
- char pipe_read_char;
- apr_size_t n = 1;
-
- ret = apr_recv(lr->sd, &pipe_read_char, &n);
- if (APR_STATUS_IS_EAGAIN(ret)) {
- /* It lost the lottery. It must continue to suffer
- * through a life of servitude. */
- }
- else {
- /* It won the lottery (or something else is very
- * wrong). Embrace death with open arms. */
- workers_may_exit = 1;
- }
- }
- apr_thread_mutex_unlock(pipe_of_death_mutex);
- return APR_SUCCESS;
-}
-
-static apr_status_t receive_from_other_child(void **csd, ap_listen_rec *lr,
- apr_pool_t *ptrans)
-{
- struct msghdr msg;
- struct cmsghdr *cmsg;
- char sockname[80];
- struct iovec iov;
- int ret, dp;
- apr_os_sock_t sd;
-
- apr_os_sock_get(&sd, lr->sd);
-
- iov.iov_base = sockname;
- iov.iov_len = 80;
-
- msg.msg_name = NULL;
- msg.msg_namelen = 0;
- msg.msg_iov = &iov;
- msg.msg_iovlen = 1;
-
- cmsg = apr_palloc(ptrans, sizeof(*cmsg) + sizeof(sd));
- cmsg->cmsg_len = sizeof(*cmsg) + sizeof(sd);
- msg.msg_control = (caddr_t)cmsg;
- msg.msg_controllen = cmsg->cmsg_len;
- msg.msg_flags = 0;
-
- ret = recvmsg(sd, &msg, 0);
-
- memcpy(&dp, CMSG_DATA(cmsg), sizeof(dp));
-
- apr_os_sock_put((apr_socket_t **)csd, &dp, ptrans);
- return 0;
-}
-
-/* idle_thread_count should be incremented before starting a worker_thread */
-
-static void *worker_thread(apr_thread_t *thd, void *arg)
-{
- void *csd = NULL;
- apr_pool_t *tpool; /* Pool for this thread */
- apr_pool_t *ptrans; /* Pool for per-transaction stuff */
- volatile int thread_just_started = 1;
- int srv;
- int thread_num = *((int *) arg);
- long conn_id = child_num * thread_limit + thread_num;
- apr_pollfd_t *pollset;
- apr_status_t rv;
- ap_listen_rec *lr, *last_lr = ap_listeners;
- int n;
- apr_bucket_alloc_t *bucket_alloc;
-
- apr_thread_mutex_lock(thread_pool_parent_mutex);
- apr_pool_create(&tpool, thread_pool_parent);
- apr_thread_mutex_unlock(thread_pool_parent_mutex);
- apr_pool_create(&ptrans, tpool);
-
- (void) ap_update_child_status_from_indexes(child_num, thread_num,
- SERVER_STARTING,
- (request_rec *) NULL);
-
- bucket_alloc = apr_bucket_alloc_create(apr_thread_pool_get(thd));
-
- apr_poll_setup(&pollset, num_listensocks, tpool);
- for(lr = ap_listeners; lr != NULL; lr = lr->next) {
- apr_poll_socket_add(pollset, lr->sd, APR_POLLIN);
- }
-
- while (!workers_may_exit) {
- workers_may_exit |= ((ap_max_requests_per_child != 0)
- && (requests_this_child <= 0));
- if (workers_may_exit) break;
- if (!thread_just_started) {
- apr_thread_mutex_lock(idle_thread_count_mutex);
- if (idle_thread_count < max_spare_threads) {
- idle_thread_count++;
- apr_thread_mutex_unlock(idle_thread_count_mutex);
- }
- else {
- apr_thread_mutex_unlock(idle_thread_count_mutex);
- break;
- }
- }
- else {
- thread_just_started = 0;
- }
-
- (void) ap_update_child_status_from_indexes(child_num, thread_num,
- SERVER_READY,
- (request_rec *) NULL);
-
- apr_thread_mutex_lock(thread_accept_mutex);
- if (workers_may_exit) {
- apr_thread_mutex_unlock(thread_accept_mutex);
- break;
- }
- if ((rv = SAFE_ACCEPT(apr_proc_mutex_lock(process_accept_mutex)))
- != APR_SUCCESS) {
- ap_log_error(APLOG_MARK, APLOG_EMERG, rv, ap_server_conf,
- "apr_proc_mutex_lock failed. Attempting to shutdown "
- "process gracefully.");
- workers_may_exit = 1;
- }
-
- while (!workers_may_exit) {
- apr_int16_t event;
- srv = apr_poll(pollset, &n, -1);
-
- if (srv != APR_SUCCESS) {
- if (APR_STATUS_IS_EINTR(srv)) {
- continue;
- }
-
- /* apr_poll() will only return errors in catastrophic
- * circumstances. Let's try exiting gracefully, for now. */
- ap_log_error(APLOG_MARK, APLOG_ERR, srv, (const server_rec *)
- ap_server_conf, "apr_poll: (listen)");
- workers_may_exit = 1;
- }
- if (workers_may_exit) break;
-
- /* find a listener */
- lr = last_lr;
- do {
- lr = lr->next;
- if (lr == NULL) {
- lr = ap_listeners;
- }
- /* XXX: Should we check for POLLERR? */
- apr_poll_revents_get(&event, lr->sd, pollset);
- if (event & APR_POLLIN) {
- last_lr = lr;
- goto got_fd;
- }
- } while (lr != last_lr);
- }
- got_fd:
- if (!workers_may_exit) {
- rv = lr->accept_func(&csd, lr, ptrans);
- if (rv == APR_EGENERAL) {
- /* E[NM]FILE, ENOMEM, etc */
- workers_may_exit = 1;
- }
- if ((rv = SAFE_ACCEPT(apr_proc_mutex_unlock(process_accept_mutex)))
- != APR_SUCCESS) {
- ap_log_error(APLOG_MARK, APLOG_EMERG, rv, ap_server_conf,
- "apr_proc_mutex_unlock failed. Attempting to shutdown "
- "process gracefully.");
- workers_may_exit = 1;
- }
- apr_thread_mutex_unlock(thread_accept_mutex);
- apr_thread_mutex_lock(idle_thread_count_mutex);
- if (idle_thread_count > min_spare_threads) {
- idle_thread_count--;
- }
- else {
- if (!start_thread()) {
- idle_thread_count--;
- }
- }
- apr_thread_mutex_unlock(idle_thread_count_mutex);
- if (setjmp(jmpbuffer) != 1) {
- process_socket(ptrans, csd, conn_id, bucket_alloc);
- }
- else {
- thread_socket_table[thread_num] = AP_PERCHILD_THISCHILD;
- }
- requests_this_child--;
- }
- else {
- if ((rv = SAFE_ACCEPT(apr_proc_mutex_unlock(process_accept_mutex)))
- != APR_SUCCESS) {
- ap_log_error(APLOG_MARK, APLOG_EMERG, rv, ap_server_conf,
- "apr_proc_mutex_unlock failed. Attempting to shutdown "
- "process gracefully.");
- workers_may_exit = 1;
- }
- apr_thread_mutex_unlock(thread_accept_mutex);
- apr_thread_mutex_lock(idle_thread_count_mutex);
- idle_thread_count--;
- apr_thread_mutex_unlock(idle_thread_count_mutex);
- break;
- }
- apr_pool_clear(ptrans);
- }
-
- apr_thread_mutex_lock(thread_pool_parent_mutex);
- ap_update_child_status_from_indexes(child_num, thread_num, SERVER_DEAD,
- (request_rec *) NULL);
- apr_pool_destroy(tpool);
- apr_thread_mutex_unlock(thread_pool_parent_mutex);
- apr_thread_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
- * by signalling the sigwait thread */
- kill(my_pid, SIGTERM);
- }
- apr_thread_mutex_unlock(worker_thread_count_mutex);
-
- apr_bucket_alloc_destroy(bucket_alloc);
-
- return NULL;
-}
-
-
-
-/* Set group privileges.
- *
- * Note that we use the username as set in the config files, rather than
- * the lookup of to uid --- the same uid may have multiple passwd entries,
- * with different sets of groups for each.
- */
-
-static int set_group_privs(uid_t uid, gid_t gid)
-{
- if (!geteuid()) {
- const char *name;
-
- /* Get username if passed as a uid */
-
- struct passwd *ent;
-
- if ((ent = getpwuid(uid)) == NULL) {
- ap_log_error(APLOG_MARK, APLOG_ALERT, errno, NULL,
- "getpwuid: couldn't determine user name from uid %u, "
- "you probably need to modify the User directive",
- (unsigned)uid);
- return -1;
- }
-
- name = ent->pw_name;
-
- /*
- * Set the GID before initgroups(), since on some platforms
- * setgid() is known to zap the group list.
- */
- if (setgid(gid) == -1) {
- ap_log_error(APLOG_MARK, APLOG_ALERT, errno, NULL,
- "setgid: unable to set group id to Group %u",
- (unsigned)gid);
- return -1;
- }
-
- /* Reset `groups' attributes. */
-
- if (initgroups(name, gid) == -1) {
- ap_log_error(APLOG_MARK, APLOG_ALERT, errno, NULL,
- "initgroups: unable to set groups for User %s "
- "and Group %u", name, (unsigned)gid);
- return -1;
- }
- }
- return 0;
-}
-
-
-static int perchild_setup_child(int childnum)
-{
- child_info_t *ug = &child_info_table[childnum];
-
- if (ug->uid == -1 && ug->gid == -1) {
- return unixd_setup_child();
- }
- if (set_group_privs(ug->uid, ug->gid)) {
- return -1;
- }
- /* Only try to switch if we're running as root */
- if (!geteuid()
- && (
-#ifdef _OSD_POSIX
- os_init_job_environment(server_conf, unixd_config.user_name,
- one_process) != 0 ||
-#endif
- setuid(ug->uid) == -1)) {
- ap_log_error(APLOG_MARK, APLOG_ALERT, errno, NULL,
- "setuid: unable to change to uid: %ld",
- (long) ug->uid);
- return -1;
- }
- return 0;
-}
-
-static int check_signal(int signum)
-{
- switch (signum) {
- case SIGTERM:
- case SIGINT:
- just_die(signum);
- return 1;
- }
- return 0;
-}
-
-static void child_main(int child_num_arg)
-{
- int i;
- apr_status_t rv;
-
- my_pid = getpid();
- child_num = child_num_arg;
- apr_pool_create(&pchild, pconf);
-
- /*stuff to do before we switch id's, so we have permissions.*/
-
- rv = SAFE_ACCEPT(apr_proc_mutex_child_init(&process_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 (perchild_setup_child(child_num)) {
- clean_child_exit(APEXIT_CHILDFATAL);
- }
-
- ap_run_child_init(pchild, ap_server_conf);
-
- /*done with init critical section */
-
- apr_setup_signal_thread();
-
- requests_this_child = ap_max_requests_per_child;
-
-
- /* Setup worker threads */
-
- if (threads_to_start > max_threads) {
- threads_to_start = max_threads;
- }
- idle_thread_count = threads_to_start;
- worker_thread_count = 0;
- worker_thread_free_ids = (int *)apr_pcalloc(pchild, thread_limit * sizeof(int));
- for (i = 0; i < max_threads; i++) {
- worker_thread_free_ids[i] = i;
- }
- apr_pool_create(&thread_pool_parent, pchild);
- apr_thread_mutex_create(&thread_pool_parent_mutex,
- APR_THREAD_MUTEX_DEFAULT, pchild);
- apr_thread_mutex_create(&idle_thread_count_mutex,
- APR_THREAD_MUTEX_DEFAULT, pchild);
- apr_thread_mutex_create(&worker_thread_count_mutex,
- APR_THREAD_MUTEX_DEFAULT, pchild);
- apr_thread_mutex_create(&pipe_of_death_mutex,
- APR_THREAD_MUTEX_DEFAULT, pchild);
- apr_thread_mutex_create(&thread_accept_mutex,
- APR_THREAD_MUTEX_DEFAULT, pchild);
-
- apr_threadattr_create(&worker_thread_attr, pchild);
- apr_threadattr_detach_set(worker_thread_attr, 1);
-
- /* 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;
- }
- }
-
- apr_signal_thread(check_signal);
-}
-
-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) {
- set_signals();
- ap_child_table[slot].pid = getpid();
- ap_child_table[slot].status = SERVER_ALIVE;
- child_main(slot);
- }
- (void) ap_update_child_status_from_indexes(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");
- /* 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_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
- * apr_signal(SIGTERM, just_die);
- */
- child_main(slot);
- clean_child_exit(0);
- }
- /* else */
- ap_child_table[slot].pid = pid;
- ap_child_table[slot].status = SERVER_ALIVE;
-
- return 0;
-}
-
-/* start up a bunch of children */
-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].pid) {
- continue;
- }
- if (make_child(ap_server_conf, i) < 0) {
- break;
- }
- --number_to_start;
- }
- return number_to_start;
-}
-
-
-/*
- * spawn_rate is the number of children that will be spawned on the
- * next maintenance cycle if there aren't enough servers. It is
- * doubled up to MAX_SPAWN_RATE, and reset only when a cycle goes by
- * without the need to spawn.
- */
-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;
- 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].pid == 0) {
- 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]);
- }
- /* 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 (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;
- apr_exit_why_e exitwhy;
- int status;
- apr_proc_t pid;
- int i;
-
- while (!restart_pending && !shutdown_pending) {
- ap_wait_or_timeout(&exitwhy, &status, &pid, pconf);
-
- if (pid.pid != -1) {
- if (ap_process_child_status(&pid, exitwhy, status)
- == APEXIT_CHILDFATAL) {
- shutdown_pending = 1;
- child_fatal = 1;
- return;
- }
- /* non-fatal death... note that it's gone in the child table and
- * clean out the status table. */
- child_slot = -1;
- for (i = 0; i < ap_max_daemons_limit; ++i) {
- if (ap_child_table[i].pid == pid.pid) {
- child_slot = i;
- break;
- }
- }
- if (child_slot >= 0) {
- ap_child_table[child_slot].pid = 0;
- ap_update_child_status_from_indexes(child_slot, i, SERVER_DEAD,
- (request_rec *) NULL);
-
-
- if (remaining_children_to_start
- && child_slot < num_daemons) {
- /* 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
- * child table. Somehow we don't know about this
- * child.
- */
- 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,
- * 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.
- */
- remaining_children_to_start = \
- startup_children(remaining_children_to_start);
- /* 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_child_maintenance();
- }
-}
-
-int ap_mpm_run(apr_pool_t *_pconf, apr_pool_t *plog, server_rec *s)
-{
- int remaining_children_to_start;
- int i;
- apr_status_t rv;
- apr_size_t one = 1;
- ap_listen_rec *lr;
- apr_socket_t *sock = NULL;
- int fd;
-
- ap_log_pid(pconf, ap_pid_fname);
-
- first_server_limit = server_limit;
- first_thread_limit = thread_limit;
- if (changed_limit_at_restart) {
- ap_log_error(APLOG_MARK, APLOG_WARNING | APLOG_NOERRNO, 0, s,
- "WARNING: Attempt to change ServerLimit or ThreadLimit "
- "ignored during restart");
- changed_limit_at_restart = 0;
- }
-
- ap_server_conf = s;
-
- /* Initialize cross-process accept lock */
- ap_lock_fname = apr_psprintf(_pconf, "%s.%u",
- ap_server_root_relative(_pconf, ap_lock_fname),
- my_pid);
- rv = SAFE_ACCEPT(apr_proc_mutex_create(&process_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 cross-process lock");
- return 1;
- }
-
- if (!is_graceful) {
- if (ap_run_pre_mpm(s->process->pool, SB_SHARED) != OK) {
- return 1;
- }
- }
- /* Initialize the child table */
- if (!is_graceful) {
- for (i = 0; i < server_limit; i++) {
- ap_child_table[i].pid = 0;
- }
- }
-
- /* We need to put the new listeners at the end of the ap_listeners
- * list. If we don't, then the pool will be cleared before the
- * open_logs phase is called for the second time, and ap_listeners
- * will have only invalid data. If that happens, then the sockets
- * that we opened using make_sock() will be lost, and the server
- * won't start.
- */
- for (lr = ap_listeners ; lr->next != NULL; lr = lr->next) {
- continue;
- }
-
- apr_os_file_get(&fd, pipe_of_death_in);
- apr_os_sock_put(&sock, &fd, pconf);
- lr->next = apr_palloc(pconf, sizeof(*lr));
- lr->next->sd = sock;
- lr->next->active = 1;
- lr->next->accept_func = check_pipe_of_death;
- lr->next->next = NULL;
- lr = lr->next;
- num_listensocks++;
-
- apr_os_sock_put(&sock, &child_info_table[child_num].sd, pconf);
- lr->next = apr_palloc(pconf, sizeof(*lr));
- lr->next->sd = sock;
- lr->next->active = 1;
- lr->next->accept_func = receive_from_other_child;
- lr->next->next = NULL;
- num_listensocks++;
-
-
- set_signals();
-
- /* 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 = 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
- * exponential mode */
- 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());
-#ifdef AP_MPM_WANT_SET_ACCEPT_LOCK_MECH
- ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_DEBUG, 0, ap_server_conf,
- "AcceptMutex: %s", ap_valid_accept_mutex_string);
-#endif
- restart_pending = shutdown_pending = 0;
-
- server_main_loop(remaining_children_to_start);
-
- 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 */
-
- if (!child_fatal) {
- /* 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;
- }
-
- if (is_graceful) {
- char char_of_death = '!';
-
- ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_NOTICE, 0,
- ap_server_conf, AP_SIG_GRACEFUL_STRING " received. "
- "Doing graceful restart");
-
- /* This is mostly for debugging... so that we know what is still
- * gracefully dealing with existing request.
- */
-
- for (i = 0; i < num_daemons; ++i) {
- if (ap_child_table[i].pid) {
- ap_child_table[i].status = SERVER_DYING;
- }
- }
- /* give the children the signal to die */
- for (i = 0; i < num_daemons;) {
- if ((rv = apr_file_write(pipe_of_death_out, &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++;
- }
- }
- else {
- /* Kill 'em all. Since the child acts the same on the parents SIGTERM
- * and a SIGHUP, we may as well use the same signal, because some user
- * pthreads are stealing signals from us left and right.
- */
- 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;
-}
-
-/* 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 perchild_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_NOERRNO|APLOG_ALERT|APLOG_STARTUP, 0,
- NULL, "no listening sockets available, shutting down");
- return DONE;
- }
-
- ap_log_pid(pconf, ap_pid_fname);
-
- 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;
- }
-
- if ((rv = apr_file_pipe_create(&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,
- "apr_file_pipe_create (pipe_of_death)");
- exit(1);
- }
- if ((rv = apr_file_pipe_timeout_set(pipe_of_death_in, 0)) != APR_SUCCESS) {
- ap_log_error(APLOG_MARK, APLOG_ERR, rv,
- (const server_rec*) ap_server_conf,
- "apr_file_pipe_timeout_set (pipe_of_death)");
- exit(1);
- }
-
- return OK;
-}
-
-static int perchild_pre_config(apr_pool_t *p, apr_pool_t *plog, apr_pool_t *ptemp)
-{
- static int restart_num = 0;
- int no_detach, debug, foreground;
- ap_directive_t *pdir;
- int i;
- int tmp_server_limit = DEFAULT_SERVER_LIMIT;
- int tmp_thread_limit = DEFAULT_THREAD_LIMIT;
- apr_status_t rv;
-
- debug = ap_exists_config_define("DEBUG");
-
- if (debug) {
- foreground = one_process = 1;
- no_detach = 0;
- }
- else {
- one_process = ap_exists_config_define("ONE_PROCESS");
- no_detach = ap_exists_config_define("NO_DETACH");
- 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;
- }
- }
-
- my_pid = getpid();
- }
-
- unixd_pre_config(ptemp);
- 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 = thread_limit;
- ap_pid_fname = DEFAULT_PIDLOG;
- ap_lock_fname = DEFAULT_LOCKFILE;
- ap_max_requests_per_child = DEFAULT_MAX_REQUESTS_PER_CHILD;
- curr_child_num = 0;
-
- apr_cpystrn(ap_coredump_dir, ap_server_root, sizeof(ap_coredump_dir));
-
- /* we need to know ServerLimit and ThreadLimit before we start processing
- * the tree because we need to already have allocated child_info_table
- */
- for (pdir = ap_conftree; pdir != NULL; pdir = pdir->next) {
- if (!strcasecmp(pdir->directive, "ServerLimit")) {
- if (atoi(pdir->args) > tmp_server_limit) {
- tmp_server_limit = atoi(pdir->args);
- if (tmp_server_limit > MAX_SERVER_LIMIT) {
- tmp_server_limit = MAX_SERVER_LIMIT;
- }
- }
- }
- else if (!strcasecmp(pdir->directive, "ThreadLimit")) {
- if (atoi(pdir->args) > tmp_thread_limit) {
- tmp_thread_limit = atoi(pdir->args);
- if (tmp_thread_limit > MAX_THREAD_LIMIT) {
- tmp_thread_limit = MAX_THREAD_LIMIT;
- }
- }
- }
- }
-
- child_info_table = (child_info_t *)apr_pcalloc(p, tmp_server_limit * sizeof(child_info_t));
- for (i = 0; i < tmp_server_limit; i++) {
- child_info_table[i].uid = -1;
- child_info_table[i].gid = -1;
- child_info_table[i].sd = -1;
- }
-
- return OK;
-}
-
-static int pass_request(request_rec *r)
-{
- apr_socket_t *thesock = ap_get_module_config(r->connection->conn_config, &core_module);
- struct msghdr msg;
- struct cmsghdr *cmsg;
- int sfd;
- struct iovec iov;
- conn_rec *c = r->connection;
- apr_bucket_brigade *bb = apr_brigade_create(r->pool, c->bucket_alloc);
- perchild_server_conf *sconf = (perchild_server_conf *)
- ap_get_module_config(r->server->module_config,
- &mpm_perchild_module);
- char *foo = NULL;
- apr_size_t len;
-
-/* XXX apr_get_brigade(..., AP_MODE_EXHAUSTIVE); RBB */
-/* foo = brigade_to_string() */
- len = strlen(foo);
-
- apr_os_sock_get(&sfd, thesock);
-
- iov.iov_base = NULL;
- iov.iov_len = 0;
-
- msg.msg_name = NULL;
- msg.msg_namelen = 0;
- msg.msg_iov = &iov;
- msg.msg_iovlen = 1;
-
- cmsg = apr_palloc(r->pool, sizeof(*cmsg) + sizeof(sfd));
- cmsg->cmsg_len = sizeof(*cmsg) + sizeof(int);
- cmsg->cmsg_level = SOL_SOCKET;
- cmsg->cmsg_type = SCM_RIGHTS;
-
- memcpy(CMSG_DATA(cmsg), &sfd, sizeof(sfd));
-
- msg.msg_control = (caddr_t)cmsg;
- msg.msg_controllen = cmsg->cmsg_len;
- msg.msg_flags=0;
-
- if (sendmsg(sconf->sd2, &msg, 0) == -1) {
- apr_pool_destroy(r->pool);
- return -1;
- }
-
- write(sconf->sd2, foo, len);
-
- /* ### this "read one line" doesn't seem right... shouldn't we be
- ### reading large chunks of data or something?
- */
- while (ap_get_brigade(r->input_filters, bb, AP_MODE_GETLINE,
- APR_NONBLOCK_READ, 0) == APR_SUCCESS) {
- apr_bucket *e;
- APR_BRIGADE_FOREACH(e, bb) {
- const char *str;
-
- apr_bucket_read(e, &str, &len, APR_NONBLOCK_READ);
- write(sconf->sd2, str, len);
- }
- }
-
- apr_pool_destroy(r->pool);
- return 1;
-}
-
-static char *make_perchild_socket(const char *fullsockname, int sd[2])
-{
- socketpair(PF_UNIX, SOCK_STREAM, 0, sd);
- return NULL;
-}
-
-static int perchild_post_config(apr_pool_t *p, apr_pool_t *plog, apr_pool_t *ptemp, server_rec *s)
-{
- int i;
- server_rec *sr;
- perchild_server_conf *sconf;
- int def_sd[2];
-
- def_sd[0] = -1;
- def_sd[1] = -1;
-
- for (sr = s; sr; sr = sr->next) {
- sconf = (perchild_server_conf *)ap_get_module_config(sr->module_config,
- &mpm_perchild_module);
-
- if (sconf->sd == -1) {
- sconf->fullsockname = apr_pstrcat(sr->process->pool,
- sconf->sockname, ".DEFAULT", NULL);
- if (def_sd[0] == -1) {
- if (!make_perchild_socket(sconf->fullsockname, def_sd)) {
- /* log error */
- }
- }
- sconf->sd = def_sd[0];
- sconf->sd2 = def_sd[1];
- }
- }
-
- for (i = 0; i < num_daemons; i++) {
- if (child_info_table[i].uid == -1) {
- child_info_table[i].sd = def_sd[0];
- }
- }
-
- thread_socket_table = (int *)apr_pcalloc(p, thread_limit * sizeof(int));
- for (i = 0; i < thread_limit; i++) {
- thread_socket_table[i] = AP_PERCHILD_THISCHILD;
- }
- ap_child_table = (ap_ctable *)apr_pcalloc(p, server_limit * sizeof(ap_ctable));
-
- return OK;
-}
-
-static int perchild_post_read(request_rec *r)
-{
- int thread_num = r->connection->id % thread_limit;
- perchild_server_conf *sconf = (perchild_server_conf *)
- ap_get_module_config(r->server->module_config,
- &mpm_perchild_module);
-
- if (thread_socket_table[thread_num] != AP_PERCHILD_THISCHILD) {
- apr_socket_t *csd = NULL;
-
- apr_os_sock_put(&csd, &thread_socket_table[thread_num],
- r->connection->pool);
- ap_sock_disable_nagle(csd);
- ap_set_module_config(r->connection->conn_config, &core_module, csd);
- return OK;
- }
- else {
- /* sconf is the server config for this vhost, so if our socket
- * is not the same that was set in the config, then the request
- * needs to be passed to another child. */
- if (sconf->sd != child_info_table[child_num].sd) {
- if (pass_request(r) == -1) {
- ap_log_error(APLOG_MARK, APLOG_ERR | APLOG_NOERRNO, 0,
- ap_server_conf, "Could not pass request to proper "
- "child, request will not be honored.");
- }
- longjmp(jmpbuffer, 1);
- }
- return OK;
- }
- return OK;
-}
-
-static void perchild_hooks(apr_pool_t *p)
-{
- /* The perchild 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};
- one_process = 0;
-
- ap_hook_open_logs(perchild_open_logs, NULL, aszSucc, APR_HOOK_MIDDLE);
- ap_hook_pre_config(perchild_pre_config, NULL, NULL, APR_HOOK_MIDDLE);
- ap_hook_post_config(perchild_post_config, NULL, NULL, APR_HOOK_MIDDLE);
-
- /* This must be run absolutely first. If this request isn't for this
- * server then we need to forward it to the proper child. No sense
- * tying up this server running more post_read request hooks if it is
- * just going to be forwarded along.
- */
- ap_hook_post_read_request(perchild_post_read, NULL, NULL,
- APR_HOOK_REALLY_FIRST);
-}
-
-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 > server_limit) {
- ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
- "WARNING: NumServers of %d exceeds ServerLimit value "
- "of %d servers,", num_daemons, server_limit);
- ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
- " lowering NumServers to %d. To increase, please "
- "see the", server_limit);
- ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
- " ServerLimit directive.");
- num_daemons = 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 > thread_limit) {
- ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
- "WARNING: StartThreads of %d exceeds ThreadLimit value"
- " of %d threads,", threads_to_start,
- thread_limit);
- ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
- " lowering StartThreads to %d. To increase, please"
- " see the", thread_limit);
- ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
- " ThreadLimit directive.");
- }
- 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)
-{
- const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
- if (err != NULL) {
- return err;
- }
-
- max_spare_threads = atoi(arg);
- if (max_spare_threads >= thread_limit) {
- ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
- "WARNING: detected MinSpareThreads set higher than");
- ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
- "ThreadLimit. Resetting to %d", thread_limit);
- max_spare_threads = thread_limit;
- }
- return NULL;
-}
-
-static const char *set_max_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_threads = atoi(arg);
- if (max_threads > thread_limit) {
- ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
- "WARNING: detected MaxThreadsPerChild set higher than");
- ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
- "ThreadLimit. Resetting to %d", thread_limit);
- max_threads = thread_limit;
- }
- return NULL;
-}
-
-static const char *set_child_per_uid(cmd_parms *cmd, void *dummy, const char *u,
- const char *g, const char *num)
-{
- int i;
- int max_this_time = atoi(num) + curr_child_num;
-
- for (i = curr_child_num; i < max_this_time; i++, curr_child_num++) {
- child_info_t *ug = &child_info_table[i - 1];
-
- if (i > num_daemons) {
- return "Trying to use more child ID's than NumServers. Increase "
- "NumServers in your config file.";
- }
-
- ug->uid = ap_uname2id(u);
- ug->gid = ap_uname2id(g);
-
-#ifndef BIG_SECURITY_HOLE
- if (ug->uid == 0 || ug->gid == 0) {
- return "Assigning root user/group to a child.";
- }
-#endif
- }
- return NULL;
-}
-
-static const char *assign_childuid(cmd_parms *cmd, void *dummy, const char *uid,
- const char *gid)
-{
- int i;
- int matching = 0;
- int u = ap_uname2id(uid);
- int g = ap_uname2id(gid);
- const char *errstr;
- int socks[2];
- perchild_server_conf *sconf = (perchild_server_conf *)
- ap_get_module_config(cmd->server->module_config,
- &mpm_perchild_module);
-
- sconf->fullsockname = apr_pstrcat(cmd->pool, sconf->sockname, ".", uid,
- ":", gid, NULL);
-
- if ((errstr = make_perchild_socket(sconf->fullsockname, socks))) {
- return errstr;
- }
-
- sconf->sd = socks[0];
- sconf->sd2 = socks[1];
-
- for (i = 0; i < num_daemons; i++) {
- if (u == child_info_table[i].uid && g == child_info_table[i].gid) {
- child_info_table[i].sd = sconf->sd;
- matching++;
- }
- }
-
- if (!matching) {
- return "Unable to find process with matching uid/gid.";
- }
- 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 | APLOG_NOERRNO, 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 | APLOG_NOERRNO, 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 | APLOG_NOERRNO, 0, NULL,
- "WARNING: Require ServerLimit > 0, setting to 1");
- server_limit = 1;
- }
- return NULL;
-}
-
-static const char *set_thread_limit (cmd_parms *cmd, void *dummy, const char *arg)
-{
- int tmp_thread_limit;
-
- const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
- if (err != NULL) {
- return err;
- }
-
- tmp_thread_limit = atoi(arg);
- /* you cannot change ThreadLimit across a restart; ignore
- * any such attempts
- */
- if (first_thread_limit &&
- tmp_thread_limit != thread_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;
- }
- thread_limit = tmp_thread_limit;
-
- if (thread_limit > MAX_THREAD_LIMIT) {
- ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
- "WARNING: ThreadLimit of %d exceeds compile time limit "
- "of %d servers,", thread_limit, MAX_THREAD_LIMIT);
- ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
- " lowering ThreadLimit to %d.", MAX_THREAD_LIMIT);
- thread_limit = MAX_THREAD_LIMIT;
- }
- else if (thread_limit < 1) {
- ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
- "WARNING: Require ThreadLimit > 0, setting to 1");
- thread_limit = 1;
- }
- return NULL;
-}
-
-static const command_rec perchild_cmds[] = {
-UNIX_DAEMON_COMMANDS,
-LISTEN_COMMANDS,
-AP_INIT_TAKE1("NumServers", set_num_daemons, NULL, RSRC_CONF,
- "Number of children alive at the same time"),
-AP_INIT_TAKE1("StartThreads", set_threads_to_start, NULL, RSRC_CONF,
- "Number of threads each child creates"),
-AP_INIT_TAKE1("MinSpareThreads", set_min_spare_threads, NULL, RSRC_CONF,
- "Minimum number of idle threads per child, to handle "
- "request spikes"),
-AP_INIT_TAKE1("MaxSpareThreads", set_max_spare_threads, NULL, RSRC_CONF,
- "Maximum number of idle threads per child"),
-AP_INIT_TAKE1("MaxThreadsPerChild", set_max_threads, NULL, RSRC_CONF,
- "Maximum number of threads per child"),
-AP_INIT_TAKE3("ChildperUserID", set_child_per_uid, NULL, RSRC_CONF,
- "Specify a User and Group for a specific child process."),
-AP_INIT_TAKE2("AssignUserID", assign_childuid, NULL, RSRC_CONF,
- "Tie a virtual host to a specific child process."),
-AP_INIT_TAKE1("ServerLimit", set_server_limit, NULL, RSRC_CONF,
- "Maximum value of NumServers for this run of Apache"),
-AP_INIT_TAKE1("ThreadLimit", set_thread_limit, NULL, RSRC_CONF,
- "Maximum worker threads in a server for this run of Apache"),
-{ NULL }
-};
-
-static void *perchild_create_config(apr_pool_t *p, server_rec *s)
-{
- perchild_server_conf *c = (perchild_server_conf *)
- apr_pcalloc(p, sizeof(perchild_server_conf));
-
- c->sd = -1;
- return c;
-}
-
-module AP_MODULE_DECLARE_DATA mpm_perchild_module = {
- MPM20_MODULE_STUFF,
- NULL, /* hook to run before apache parses args */
- NULL, /* create per-directory config structure */
- NULL, /* merge per-directory config structures */
- perchild_create_config, /* create per-server config structure */
- NULL, /* merge per-server config structures */
- perchild_cmds, /* command apr_table_t */
- perchild_hooks /* register_hooks */
-};
-
projects / apache / commitdiff