perchild.c revision ae695b6a7316a92dddee9327ce71ec65ba522670
/* ====================================================================
* The Apache Software License, Version 1.1
*
* Copyright (c) 2000-2001 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
* 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
*
* 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"
#include <unistd.h>
#endif
#endif
#if !APR_HAS_THREADS
#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 <setjmp.h>
#ifdef HAVE_SYS_PROCESSOR_H
#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 max_requests_per_child = 0;
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_listenfds = 0;
static apr_socket_t **listenfds;
struct child_info_t {
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 */
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! */
static apr_lock_t *pipe_of_death_mutex;
/* *Non*-shared http_main globals... */
/* 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_lock_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_lock_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_lock_t *idle_thread_count_mutex;
/* Locks for accept serialization */
#ifdef NO_SERIALIZED_ACCEPT
#else
static apr_lock_t *process_accept_mutex;
#endif /* NO_SERIALIZED_ACCEPT */
static apr_lock_t *thread_accept_mutex;
{
switch(query_code){
case AP_MPMQ_MAX_DAEMON_USED:
return APR_SUCCESS;
case AP_MPMQ_IS_THREADED:
return APR_SUCCESS;
case AP_MPMQ_IS_FORKED:
*result = AP_MPMQ_STATIC;
return APR_SUCCESS;
*result = server_limit;
return APR_SUCCESS;
*result = thread_limit;
return APR_SUCCESS;
case AP_MPMQ_MAX_THREADS:
*result = max_threads;
return APR_SUCCESS;
*result = 0;
return APR_SUCCESS;
return APR_SUCCESS;
*result = 0;
return APR_SUCCESS;
return APR_SUCCESS;
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) {
}
}
/* handle all varieties of core dumping signals */
static void sig_coredump(int 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.
*/
}
{
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,
* 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;
if (is_graceful) {
}
}
{
}
{
#ifndef WIN32
#else
ap_start_restart(1);
#endif
}
static void set_signals(void)
{
#ifndef NO_USE_SIGACTION
if (!one_process) {
#if defined(SA_ONESHOT)
#elif defined(SA_RESETHAND)
#endif
"sigaction(SIGSEGV)");
#ifdef SIGBUS
"sigaction(SIGBUS)");
#endif
#ifdef SIGABORT
"sigaction(SIGABORT)");
#endif
#ifdef SIGABRT
"sigaction(SIGABRT)");
#endif
#ifdef SIGILL
"sigaction(SIGILL)");
#endif
}
"sigaction(SIGTERM)");
#ifdef SIGINT
"sigaction(SIGINT)");
#endif
#ifdef SIGXCPU
"sigaction(SIGXCPU)");
#endif
#ifdef SIGXFSZ
"sigaction(SIGXFSZ)");
#endif
#ifdef SIGPIPE
"sigaction(SIGPIPE)");
#endif
/* we want to ignore HUPs and AP_SIG_GRACEFUL while we're busy
* processing one */
"sigaction(SIGHUP)");
#else
if (!one_process) {
#ifdef SIGBUS
#endif /* SIGBUS */
#ifdef SIGABORT
#endif /* SIGABORT */
#ifdef SIGABRT
#endif /* SIGABRT */
#ifdef SIGILL
#endif /* SIGILL */
#ifdef SIGXCPU
#endif /* SIGXCPU */
#ifdef SIGXFSZ
#endif /* SIGXFSZ */
}
#ifdef SIGHUP
#endif /* SIGHUP */
#ifdef AP_SIG_GRACEFUL
#endif /* AP_SIG_GRACEFUL */
#ifdef SIGPIPE
#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.
*/
{
int csd;
}
if (csd >= FD_SETSIZE) {
"new file descriptor %d is too large; you probably need "
"to rebuild Apache with a larger FD_SETSIZE "
"(currently %d)",
csd, FD_SETSIZE);
return;
}
if (thread_socket_table[thread_num] < 0) {
}
if (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)
{
int rc;
if (rc != APR_SUCCESS) {
"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;
return 0;
}
else {
}
}
else {
static int reported = 0;
if (!reported) {
"server reached MaxThreadsPerChild setting, "
"consider raising the MaxThreadsPerChild or "
"NumServers settings");
reported = 1;
}
return 0;
}
return 1;
}
/* Sets workers_may_exit if we received a character on the pipe_of_death */
static void check_pipe_of_death(void)
{
if (!workers_may_exit) {
int ret;
char pipe_read_char;
apr_size_t n = 1;
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;
}
}
}
/* idle_thread_count should be incremented before starting a worker_thread */
{
volatile int last_pollfd = 0;
volatile int thread_just_started = 1;
int srv;
int curr_pollfd;
int thread_num = *((int *) arg);
int n;
(request_rec *) NULL);
for(n = 0; n <= num_listenfds; ++n) {
}
while (!workers_may_exit) {
workers_may_exit |= (max_requests_per_child != 0)
&& (requests_this_child <= 0);
if (workers_may_exit) break;
if (!thread_just_started) {
if (idle_thread_count < max_spare_threads) {
}
else {
break;
}
}
else {
thread_just_started = 0;
}
(request_rec *) NULL);
if (workers_may_exit) {
break;
}
!= APR_SUCCESS) {
"apr_lock_acquire failed. Attempting to shutdown "
"process gracefully.");
workers_may_exit = 1;
}
while (!workers_may_exit) {
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_server_conf, "apr_poll: (listen)");
workers_may_exit = 1;
}
if (workers_may_exit) break;
if (event & APR_POLLIN) {
/* A process got a signal on the shutdown pipe. Check if we're
* the lucky process to die. */
continue;
}
/* This request is from another child in our current process.
* We should set a flag here, and then below we will read
* two bytes (the socket number and the NULL byte.
*/
goto got_from_other_child;
}
if (num_listenfds == 1) {
goto got_fd;
}
else {
/* find a listener */
do {
curr_pollfd++;
if (curr_pollfd > num_listenfds) {
curr_pollfd = 1;
}
/* XXX: Should we check for POLLERR? */
pollset);
if (event & APR_POLLIN) {
goto got_fd;
}
} while (curr_pollfd != last_pollfd);
}
}
if (!workers_may_exit) {
"apr_accept");
}
!= APR_SUCCESS) {
"apr_lock_release failed. Attempting to shutdown "
"process gracefully.");
workers_may_exit = 1;
}
if (idle_thread_count > min_spare_threads) {
}
else {
if (!start_thread()) {
}
}
char sockname[80];
msg.msg_namelen = 0;
}
}
else {
}
}
else {
!= APR_SUCCESS) {
"apr_lock_release failed. Attempting to shutdown "
"process gracefully.");
workers_may_exit = 1;
}
break;
}
}
(request_rec *) NULL);
if (worker_thread_count == 0) {
/* All the threads have exited, now finish the shutdown process
* by signalling the sigwait thread */
}
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.
*/
{
if (!geteuid()) {
const char *name;
/* Get username if passed as a uid */
"getpwuid: couldn't determine user name from uid %u, "
"you probably need to modify the User directive",
(unsigned)uid);
return -1;
}
/*
* Set the GID before initgroups(), since on some platforms
* setgid() is known to zap the group list.
*/
"setgid: unable to set group id to Group %u",
(unsigned)gid);
return -1;
}
/* Reset `groups' attributes. */
"initgroups: unable to set groups for User %s "
return -1;
}
}
return 0;
}
static int perchild_setup_child(int childnum)
{
return unixd_setup_child();
}
return -1;
}
/* Only try to switch if we're running as root */
if (!geteuid()
&& (
#ifdef _OSD_POSIX
one_process) != 0 ||
#endif
"setuid: unable to change to uid: %ld",
return -1;
}
return 0;
}
static int check_signal(int signum)
{
switch (signum) {
case SIGTERM:
case SIGINT:
return 1;
}
return 0;
}
static void child_main(int child_num_arg)
{
int i;
/*stuff to do before we switch id's, so we have permissions.*/
pchild));
if (rv != APR_SUCCESS) {
"Couldn't initialize cross-process lock in child");
}
if (perchild_setup_child(child_num)) {
}
/*done with init critical section */
/* Set up the pollfd array, num_listenfds + 1 for the pipe and 1 for
* the child socket.
*/
#endif
/* The child socket */
}
/* Setup worker threads */
if (threads_to_start > max_threads) {
}
worker_thread_count = 0;
for (i = 0; i < max_threads; i++) {
worker_thread_free_ids[i] = i;
}
/* 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;
}
}
}
{
int pid;
}
if (one_process) {
set_signals();
}
(request_rec *) NULL);
"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.
*/
}
#endif
/* XXX - For an unthreaded server, a signal handler will be necessary
* apr_signal(SIGTERM, just_die);
*/
clean_child_exit(0);
}
/* else */
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;
}
}
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;
}
break;
}
}
if (free_length > 0) {
for (i = 0; i < free_length; ++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
*/
}
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;
int status;
int i;
while (!restart_pending && !shutdown_pending) {
== 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) {
child_slot = i;
break;
}
}
if (child_slot >= 0) {
(request_rec *) NULL);
&& child_slot < num_daemons) {
/* we're still doing a 1-for-1 replacement of dead
* children with new children
*/
}
}
/* 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.
*/
"long lost child came home! (pid %ld)",
}
/* 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.
*/
/* 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;
}
}
}
{
int i;
ap_server_conf = s;
if (changed_limit_at_restart) {
"WARNING: Attempt to change ServerLimit or ThreadLimit "
"ignored during restart");
}
pconf)) != APR_SUCCESS) {
(const server_rec*) ap_server_conf,
"apr_file_pipe_create (pipe_of_death)");
exit(1);
}
(const server_rec*) ap_server_conf,
"apr_file_pipe_timeout_set (pipe_of_death)");
exit(1);
}
ap_server_conf = s;
/* XXX: hey, what's the right way for the mpm to indicate
* a fatal error? */
"no listening sockets available, shutting down");
return 1;
}
/* Initialize cross-process accept lock */
my_pid);
ap_lock_fname, _pconf));
if (rv != APR_SUCCESS) {
"Couldn't create cross-process lock");
return 1;
}
if (!is_graceful) {
return 1;
}
}
/* Initialize the child table */
if (!is_graceful) {
for (i = 0; i < server_limit; i++) {
ap_child_table[i].pid = 0;
}
}
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.
*/
if (!is_graceful) {
}
else {
/* give the system some time to recover before kicking into
* exponential mode */
}
"%s configured -- resuming normal operations",
"Server built: %s", ap_get_server_built());
restart_pending = shutdown_pending = 0;
if (shutdown_pending) {
/* Time to gracefully shut down:
* Kill child processes, tell them to call child_exit, etc...
*/
"killpg SIGTERM");
}
if (!child_fatal) {
/* cleanup pid file on normal shutdown */
"removed PID file %s (pid=%ld)",
}
ap_server_conf, "caught SIGTERM, shutting down");
}
return 1;
}
/* we've been told to restart */
if (one_process) {
/* not worth thinking about */
return 1;
}
if (is_graceful) {
char char_of_death = '!';
"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) {
}
}
/* give the children the signal to die */
for (i = 0; i < num_daemons;) {
&one)) != APR_SUCCESS) {
if (APR_STATUS_IS_EINTR(rv)) continue;
"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.
*/
"killpg SIGTERM");
}
ap_server_conf, "SIGHUP received. Attempting to restart");
}
return 0;
}
{
static int restart_num = 0;
int i;
if (debug) {
}
else {
}
/* sigh, want this only the second time around */
if (restart_num++ == 1) {
is_graceful = 0;
if (!one_process && !no_detach) {
rv = apr_proc_detach();
if (rv != APR_SUCCESS) {
"apr_proc_detach failed");
return HTTP_INTERNAL_SERVER_ERROR;
}
}
}
curr_child_num = 0;
/* we need to know ServerLimit and ThreadLimit before we start processing
* the tree because we need to already have allocated child_info_table
*/
if (tmp_server_limit > MAX_SERVER_LIMIT) {
}
}
}
if (tmp_thread_limit > MAX_THREAD_LIMIT) {
}
}
}
}
for (i = 0; i < tmp_server_limit; i++) {
}
return OK;
}
static int pass_request(request_rec *r)
{
int sfd;
char *foo;
r->connection->pool);
r->connection->pool);
msg.msg_namelen = 0;
apr_pool_destroy(r->pool);
return -1;
}
/* ### this "read one line" doesn't seem right... shouldn't we be
### reading large chunks of data or something?
*/
APR_NONBLOCK_READ, 0) == APR_SUCCESS) {
apr_bucket *e;
APR_BRIGADE_FOREACH(e, bb) {
const char *str;
}
}
apr_pool_destroy(r->pool);
return 1;
}
{
return NULL;
}
{
int i;
server_rec *sr;
int def_sd[2];
def_sd[0] = -1;
if (def_sd[0] == -1) {
/* log error */
}
}
}
}
for (i = 0; i < num_daemons; i++) {
}
}
for (i = 0; i < thread_limit; i++) {
}
return OK;
}
static int perchild_post_read(request_rec *r)
{
while (f) {
break;
}
f = f->next;
}
r->connection->pool);
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 (pass_request(r) == -1) {
ap_server_conf, "Could not pass request to proper "
"child, request will not be honored.");
}
}
return OK;
}
return OK;
}
{
apr_bucket *e;
const char *str;
readbytes)) != APR_SUCCESS) {
return rv;
}
APR_BRIGADE_FOREACH(e, b) {
if (e->length != 0) {
}
else {
}
}
}
f->c->pool);
return APR_SUCCESS;
}
static int perchild_pre_connection(conn_rec *c)
{
return OK;
}
static void perchild_hooks(apr_pool_t *p)
{
one_process = 0;
/* 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.
*/
}
const char *arg)
{
return err;
}
if (num_daemons > server_limit) {
"WARNING: NumServers of %d exceeds ServerLimit value "
" lowering NumServers to %d. To increase, please "
"see the", server_limit);
" ServerLimit directive.");
}
else if (num_daemons < 1) {
"WARNING: Require NumServers > 0, setting to 1");
num_daemons = 1;
}
return NULL;
}
const char *arg)
{
return err;
}
if (threads_to_start > thread_limit) {
"WARNING: StartThreads of %d exceeds ThreadLimit value"
" of %d threads,", threads_to_start,
" lowering StartThreads to %d. To increase, please"
" see the", thread_limit);
" ThreadLimit directive.");
}
else if (threads_to_start < 1) {
"WARNING: Require StartThreads > 0, setting to 1");
threads_to_start = 1;
}
return NULL;
}
const char *arg)
{
return err;
}
if (min_spare_threads <= 0) {
"WARNING: detected MinSpareThreads set to non-positive.");
"Resetting to 1 to avoid almost certain Apache failure.");
"Please read the documentation.");
min_spare_threads = 1;
}
return NULL;
}
const char *arg)
{
return err;
}
if (max_spare_threads >= thread_limit) {
"WARNING: detected MinSpareThreads set higher than");
"ThreadLimit. Resetting to %d", thread_limit);
}
return NULL;
}
{
return err;
}
if (max_threads > thread_limit) {
"WARNING: detected MaxThreadsPerChild set higher than");
"ThreadLimit. Resetting to %d", thread_limit);
}
return NULL;
}
const char *g, const char *num)
{
int i;
if (i > num_daemons) {
return "Trying to use more child ID's than NumServers. Increase "
"NumServers in your config file.";
}
}
return NULL;
}
const char *gid)
{
int i;
const char *errstr;
int socks[2];
return errstr;
}
for (i = 0; i < num_daemons; i++) {
}
}
return NULL;
}
{
int tmp_server_limit;
return err;
}
/* 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
*/
return NULL;
}
if (server_limit > MAX_SERVER_LIMIT) {
"WARNING: ServerLimit of %d exceeds compile time limit "
" lowering ServerLimit to %d.", MAX_SERVER_LIMIT);
}
else if (server_limit < 1) {
"WARNING: Require ServerLimit > 0, setting to 1");
server_limit = 1;
}
return NULL;
}
{
int tmp_thread_limit;
return err;
}
/* 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
*/
return NULL;
}
if (thread_limit > MAX_THREAD_LIMIT) {
"WARNING: ThreadLimit of %d exceeds compile time limit "
" lowering ThreadLimit to %d.", MAX_THREAD_LIMIT);
}
else if (thread_limit < 1) {
"WARNING: Require ThreadLimit > 0, setting to 1");
thread_limit = 1;
}
return NULL;
}
static const command_rec perchild_cmds[] = {
"Number of children alive at the same time"),
"Number of threads each child creates"),
"Minimum number of idle threads per child, to handle "
"request spikes"),
"Maximum number of idle threads per child"),
"Maximum number of threads per child"),
"Specify a User and Group for a specific child process."),
"Tie a virtual host to a specific child process."),
"Maximum value of NumServers for this run of Apache"),
"Maximum worker threads in a server for this run of Apache"),
{ NULL }
};
{
perchild_server_conf *c = (perchild_server_conf *)
apr_pcalloc(p, sizeof(perchild_server_conf));
c->sd = -1;
return c;
}
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 */
};