path: root/server/mpm/prefork/prefork.c

/* ====================================================================
 * The Apache Software License, Version 1.1
 *
 * Copyright (c) 2000 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.
 */

/*
 * httpd.c: simple http daemon for answering WWW file requests
 *
 * 
 * 03-21-93  Rob McCool wrote original code (up to NCSA HTTPd 1.3)
 * 
 * 03-06-95  blong
 *  changed server number for child-alone processes to 0 and changed name
 *   of processes
 *
 * 03-10-95  blong
 *      Added numerous speed hacks proposed by Robert S. Thau (rst@ai.mit.edu) 
 *      including set group before fork, and call gettime before to fork
 *      to set up libraries.
 *
 * 04-14-95  rst / rh
 *      Brandon's code snarfed from NCSA 1.4, but tinkered to work with the
 *      Apache server, and also to have child processes do accept() directly.
 *
 * April-July '95 rst
 *      Extensive rework for Apache.
 */

/* TODO: this is a cobbled together prefork MPM example... it should mostly
 * TODO: behave like apache-1.3... here's a short list of things I think
 * TODO: need cleaning up still:
 * TODO: - clean up scoreboard stuff when we figure out how to do it in 2.0
 */

#define CORE_PRIVATE

#include "ap_config.h"
#include "apr_portable.h"
#include "apr_thread_proc.h"
#include "httpd.h"
#include "mpm_default.h"
#include "mpm_status.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 "iol_socket.h"
#include "ap_listen.h"
#include "ap_mmn.h"
#ifdef HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#ifdef HAVE_SYS_WAIT_H
#include <sys/wait.h>
#endif
#ifdef HAVE_SYS_SOCKET_H
#include <sys/socket.h>
#endif
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifdef HAVE_NETINET_TCP_H
#include <netinet/tcp.h>	/* for TCP_NODELAY */
#endif

#ifdef HAVE_BSTRING_H
#include <bstring.h>		/* for IRIX, FD_SET calls bzero() */
#endif
#include <signal.h>
#include <sys/times.h>

/* config globals */

static int ap_max_requests_per_child=0;
static const char *ap_pid_fname=NULL;
static ap_lock_t *accept_lock;
static const char *ap_scoreboard_fname=NULL;
static const char *ap_lock_fname;
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;
static time_t ap_restart_time=0;
static int ap_extended_status = 0;
static int maintain_connection_status = 1;

/*
 * The max child slot ever assigned, preserved across restarts.  Necessary
 * to deal with MaxClients changes across SIGUSR1 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;

static char ap_coredump_dir[MAX_STRING_LEN];

/* *Non*-shared http_main globals... */

static ap_socket_t *sd;
static fd_set listenfds;
static int listenmaxfd;

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

int ap_my_pid;	/* it seems silly to call getpid all the time */
#ifndef MULTITHREAD
static int my_child_num;
#endif

#ifdef TPF
int tpf_child = 0;
char tpf_server_name[INETD_SERVNAME_LENGTH+1];
#endif /* TPF */

API_VAR_EXPORT scoreboard *ap_scoreboard_image = NULL;
static new_scoreboard *ap_new_scoreboard_image = NULL;

#ifdef GPROF
/* 
 * change directory for gprof to plop the gmon.out file
 * configure in httpd.conf:
 * GprofDir logs/   -> $ServerRoot/logs/gmon.out
 * GprofDir logs/%  -> $ServerRoot/logs/gprof.$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;

    if(dir) {
	char buf[512];
	int len = strlen(sconf->gprof_dir) - 1;
	if(*(dir + len) == '%') {
	    dir[len] = '\0';
	    ap_snprintf(buf, sizeof(buf), "%sgprof.%d", dir, (int)getpid());
	} 
	dir = ap_server_root_relative(pconf, buf[0] ? buf : dir);
	if(mkdir(dir, 0755) < 0 && errno != EEXIST) {
	    ap_log_error(APLOG_MARK, APLOG_ERR, errno, ap_server_conf,
			 "gprof: error creating directory %s", dir);
	}
    }
    else {
	dir = ap_server_root_relative(pconf, "logs");
    }

    chdir(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)
{
    if (pchild) {
	ap_destroy_pool(pchild);
    }
    chdir_for_gprof();
    exit(code);
}

static void expand_lock_fname(ap_pool_t *p)
{
    /* XXXX possibly bogus cast */
    ap_lock_fname = ap_psprintf(p, "%s.%lu",
	ap_server_root_relative(p, ap_lock_fname), (unsigned long)getpid());
}

/* Initialize mutex lock.
 * Done by each child at its birth
 */
static void accept_mutex_child_init(ap_pool_t *p)
{
    ap_child_init_lock(&accept_lock, ap_lock_fname, p);
}

/* Initialize mutex lock.
 * Must be safe to call this on a restart.
 */
static void accept_mutex_init(ap_pool_t *p)
{
    ap_status_t rv;

    expand_lock_fname(p);
    rv = ap_create_lock(&accept_lock, APR_MUTEX, APR_CROSS_PROCESS, ap_lock_fname, p);
    if (rv) {
	ap_log_error(APLOG_MARK, APLOG_ERR, rv, NULL, "couldn't create accept mutex");
    }
}

static void accept_mutex_on(void)
{
    ap_status_t rv = ap_lock(accept_lock);
    ap_assert(!rv);
}

static void accept_mutex_off(void)
{
    ap_status_t rv = ap_unlock(accept_lock);
    ap_assert(!rv);
}

/* 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

#if APR_HAS_SHARED_MEMORY
#include "apr_shmem.h"

static ap_shmem_t *scoreboard_shm = NULL;

static ap_status_t cleanup_shared_mem(void *d)
{
    ap_shm_free(scoreboard_shm, ap_scoreboard_image);
    ap_scoreboard_image = NULL;
    ap_shm_destroy(scoreboard_shm);
    return APR_SUCCESS;
}

static void setup_shared_mem(ap_pool_t *p)
{
    char buf[512];
    const char *fname;

    fname = ap_server_root_relative(p, ap_scoreboard_fname);
    if (ap_shm_init(&scoreboard_shm, SCOREBOARD_SIZE + NEW_SCOREBOARD_SIZE + 40, fname, p) != APR_SUCCESS) {
	ap_snprintf(buf, sizeof(buf), "%s: could not open(create) scoreboard",
		    ap_server_argv0);
	perror(buf);
	exit(APEXIT_INIT);
    }
    ap_scoreboard_image = ap_shm_malloc(scoreboard_shm, SCOREBOARD_SIZE); 
    ap_new_scoreboard_image = ap_shm_malloc(scoreboard_shm, NEW_SCOREBOARD_SIZE); 
    if (ap_scoreboard_image == NULL) {
	ap_snprintf(buf, sizeof(buf), "%s: cannot allocate scoreboard",
		    ap_server_argv0);
	perror(buf);
	ap_shm_destroy(scoreboard_shm);
	exit(APEXIT_INIT);
    }
    ap_register_cleanup(p, NULL, cleanup_shared_mem, ap_null_cleanup);
    ap_scoreboard_image->global.running_generation = 0;
}

static void reopen_scoreboard(ap_pool_t *p)
{
}
#endif

/* Called by parent process */
static void reinit_scoreboard(ap_pool_t *p)
{
    int running_gen = 0;
    if (ap_scoreboard_image)
        running_gen = ap_scoreboard_image->global.running_generation;

    if (ap_scoreboard_image == NULL) {
        setup_shared_mem(p);
    }
    memset(ap_scoreboard_image, 0, SCOREBOARD_SIZE);
    ap_scoreboard_image->global.running_generation = running_gen;
}


/* Routines called to deal with the scoreboard image
 * --- note that we do *not* need write locks, since update_child_status
 * only updates a *single* record in place, and only one process writes to
 * a given scoreboard slot at a time (either the child process owning that
 * slot, or the parent, noting that the child has died).
 *
 * As a final note --- setting the score entry to getpid() is always safe,
 * since when the parent is writing an entry, it's only noting SERVER_DEAD
 * anyway.
 */
ap_inline void ap_sync_scoreboard_image(void)
{
#ifdef SCOREBOARD_FILE
    lseek(scoreboard_fd, 0L, 0);
    force_read(scoreboard_fd, ap_scoreboard_image, sizeof(*ap_scoreboard_image))
;
#endif
}

API_EXPORT(int) ap_exists_scoreboard_image(void)
{
    return (ap_scoreboard_image ? 1 : 0);
}

API_EXPORT(int) ap_get_max_daemons(void)
{
    return ap_max_daemons_limit;
}

static ap_inline void put_scoreboard_info(int child_num,
                                       short_score *new_score_rec)
{
#ifdef SCOREBOARD_FILE
    lseek(scoreboard_fd, (long) child_num * sizeof(short_score), 0);
    force_write(scoreboard_fd, new_score_rec, sizeof(short_score));
#endif
}

int ap_update_child_status(int child_num, int status, request_rec *r)
{
    int old_status;
    short_score *ss;

    if (child_num < 0)
	return -1;

    ap_check_signals();

    ss = &ap_scoreboard_image->servers[child_num];
    old_status = ss->status;
    ss->status = status;

    if (ap_extended_status) {
	if (status == SERVER_READY || status == SERVER_DEAD) {
	    /*
	     * Reset individual counters
	     */
	    if (status == SERVER_DEAD) {
		ss->my_access_count = 0L;
		ss->my_bytes_served = 0L;
	    }
	    ss->conn_count = (unsigned short) 0;
	    ss->conn_bytes = (unsigned long) 0;
	}
	if (r) {
	    conn_rec *c = r->connection;
	    ap_cpystrn(ss->client, ap_get_remote_host(c, r->per_dir_config,
				  REMOTE_NOLOOKUP), sizeof(ss->client));
	    if (r->the_request == NULL) {
		    ap_cpystrn(ss->request, "NULL", sizeof(ss->request));
	    } else if (r->parsed_uri.password == NULL) {
		    ap_cpystrn(ss->request, r->the_request, sizeof(ss->request));
	    } else {
		/* Don't reveal the password in the server-status view */
		    ap_cpystrn(ss->request, ap_pstrcat(r->pool, r->method, " ",
					       ap_unparse_uri_components(r->pool, &r->parsed_uri, UNP_OMITPASSWORD),
					       r->assbackwards ? NULL : " ", r->protocol, NULL),
				       sizeof(ss->request));
	    }
	    ss->vhostrec =  r->server;
	}
    }
    if (status == SERVER_STARTING && r == NULL) {
	/* clean up the slot's vhostrec pointer (maybe re-used)
	 * and mark the slot as belonging to a new generation.
	 */
	ss->vhostrec = NULL;
	ap_scoreboard_image->parent[child_num].generation = ap_my_generation;
#ifdef SCOREBOARD_FILE
	lseek(scoreboard_fd, XtOffsetOf(scoreboard, parent[child_num]), 0);
	force_write(scoreboard_fd, &ap_scoreboard_image->parent[child_num],
	    sizeof(parent_score));
#endif
    }
    put_scoreboard_info(child_num, ss);

    return old_status;
}

static void update_scoreboard_global(void)
{
#ifdef SCOREBOARD_FILE
    lseek(scoreboard_fd,
	  (char *) &ap_scoreboard_image->global -(char *) ap_scoreboard_image, 0);
    force_write(scoreboard_fd, &ap_scoreboard_image->global,
		sizeof ap_scoreboard_image->global);
#endif
}

void ap_time_process_request(int child_num, int status)
{
    short_score *ss;

    if (child_num < 0)
	return;

    ap_sync_scoreboard_image();
    ss = &ap_scoreboard_image->servers[child_num];

    if (status == START_PREQUEST) {
	ss->start_time = ap_now();
    }
    else if (status == STOP_PREQUEST) {
	ss->stop_time = ap_now();
    }

    put_scoreboard_info(child_num, ss);
}

/*
static void increment_counts(int child_num, request_rec *r)
{
    long int bs = 0;
    short_score *ss;

    ap_sync_scoreboard_image();
    ss = &ap_scoreboard_image->servers[child_num];

    if (r->sent_bodyct)
	ap_bgetopt(r->connection->client, BO_BYTECT, &bs);

#ifdef HAVE_TIMES
    times(&ss->times);
#endif
    ss->access_count++;
    ss->my_access_count++;
    ss->conn_count++;
    ss->bytes_served += (unsigned long) bs;
    ss->my_bytes_served += (unsigned long) bs;
    ss->conn_bytes += (unsigned long) bs;

    put_scoreboard_info(child_num, ss);
}
*/

static int find_child_by_pid(ap_proc_t *pid)
{
    int i;

    for (i = 0; i < ap_max_daemons_limit; ++i)
	if (ap_scoreboard_image->parent[i].pid == pid->pid)
	    return i;

    return -1;
}

#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(ap_wait_t *status)
{
    int n, pid;

    for (n = 0; n < ap_max_daemons_limit; ++n) {
        ap_sync_scoreboard_image();
	if (ap_scoreboard_image->servers[n].status != SERVER_DEAD &&
		kill((pid = ap_scoreboard_image->parent[n].pid), 0) == -1) {
	    ap_update_child_status(n, SERVER_DEAD, NULL);
	    /* just mark it as having a successful exit status */
	    bzero((char *) status, sizeof(ap_wait_t));
	    return(pid);
	}
    }
    return 0;
}
#endif

/* handle all varieties of core dumping signals */
static void sig_coredump(int sig)
{
    chdir(ap_coredump_dir);
    ap_signal(sig, SIG_DFL);
    kill(getpid(), sig);
    /* At this point we've got sig blocked, because we're still inside
     * 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.
     */
}

/*****************************************************************
 * Connection structures and accounting...
 */

static void just_die(int sig)
{
    clean_child_exit(0);
}

static int volatile deferred_die;
static int volatile usr1_just_die;

static void usr1_handler(int sig)
{
    if (usr1_just_die) {
	just_die(sig);
    }
    deferred_die = 1;
}

/* volatile just in case */
static int volatile shutdown_pending;
static int volatile restart_pending;
static int volatile is_graceful;
ap_generation_t volatile ap_my_generation=0;

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;
}

static void restart(int sig)
{
    if (restart_pending == 1) {
	/* Probably not an error - don't bother reporting it */
	return;
    }
    restart_pending = 1;
    if ((is_graceful = (sig == SIGUSR1))) {
        ap_kill_cleanup(pconf, NULL, cleanup_shared_mem);
    }
}

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 USR1 while we're busy processing one */
    sigaddset(&sa.sa_mask, SIGHUP);
    sigaddset(&sa.sa_mask, SIGUSR1);
    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(SIGUSR1, &sa, NULL) < 0)
	ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, "sigaction(SIGUSR1)");
#else
    if (!one_process) {
	ap_signal(SIGSEGV, sig_coredump);
#ifdef SIGBUS
	ap_signal(SIGBUS, sig_coredump);
#endif /* SIGBUS */
#ifdef SIGABORT
	ap_signal(SIGABORT, sig_coredump);
#endif /* SIGABORT */
#ifdef SIGABRT
	ap_signal(SIGABRT, sig_coredump);
#endif /* SIGABRT */
#ifdef SIGILL
	ap_signal(SIGILL, sig_coredump);
#endif /* SIGILL */
#ifdef SIGXCPU
	ap_signal(SIGXCPU, SIG_DFL);
#endif /* SIGXCPU */
#ifdef SIGXFSZ
	ap_signal(SIGXFSZ, SIG_DFL);
#endif /* SIGXFSZ */
    }

    ap_signal(SIGTERM, sig_term);
#ifdef SIGHUP
    ap_signal(SIGHUP, restart);
#endif /* SIGHUP */
#ifdef SIGUSR1
    ap_signal(SIGUSR1, restart);
#endif /* SIGUSR1 */
#ifdef SIGPIPE
    ap_signal(SIGPIPE, SIG_IGN);
#endif /* SIGPIPE */

#endif
}

#if defined(TCP_NODELAY) && !defined(MPE) && !defined(TPF)
static void sock_disable_nagle(int s)
{
    /* The Nagle algorithm says that we should delay sending partial
     * packets in hopes of getting more data.  We don't want to do
     * this; we are not telnet.  There are bad interactions between
     * persistent connections and Nagle's algorithm that have very severe
     * performance penalties.  (Failing to disable Nagle is not much of a
     * problem with simple HTTP.)
     *
     * In spite of these problems, failure here is not a shooting offense.
     */
    int just_say_no = 1;

    if (setsockopt(s, IPPROTO_TCP, TCP_NODELAY, (char *) &just_say_no,
		   sizeof(int)) < 0) {
	ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf,
		    "setsockopt: (TCP_NODELAY)");
    }
}

#else
#define sock_disable_nagle(s)	/* NOOP */
#endif


/*****************************************************************
 * Child process main loop.
 * The following vars are static to avoid getting clobbered by longjmp();
 * they are really private to child_main.
 */

static int srv;
static ap_socket_t *csd;
static int requests_this_child;
static fd_set main_fds;

int ap_graceful_stop_signalled(void)
{
    ap_sync_scoreboard_image();
    if (deferred_die ||
	ap_scoreboard_image->global.running_generation != ap_my_generation) {
	return 1;
    }
    return 0;
}

static void child_main(int child_num_arg)
{
    ap_listen_rec *lr;
    ap_listen_rec *last_lr;
    ap_listen_rec *first_lr;
    ap_pool_t *ptrans;
    conn_rec *current_conn;
    ap_iol *iol;
    ap_status_t stat = APR_SUCCESS;
    int sockdes;

    ap_my_pid = getpid();
    csd = NULL;
    my_child_num = child_num_arg;
    requests_this_child = 0;
    last_lr = NULL;

    /* Get a sub context for global allocations in this child, so that
     * we can have cleanups occur when the child exits.
     */
    ap_create_pool(&pchild, pconf);

    ap_create_pool(&ptrans, pchild);

    /* needs to be done before we switch UIDs so we have permissions */
    reopen_scoreboard(pchild);
    SAFE_ACCEPT(accept_mutex_child_init(pchild));

    if (unixd_setup_child()) {
	clean_child_exit(APEXIT_CHILDFATAL);
    }

    ap_child_init_hook(pchild, ap_server_conf);

    (void) ap_update_child_status(my_child_num, SERVER_READY, (request_rec *) NULL);

    ap_signal(SIGHUP, just_die);
    ap_signal(SIGTERM, just_die);

#ifdef OS2
/* Stop Ctrl-C/Ctrl-Break signals going to child processes */
    {
        unsigned long ulTimes;
        DosSetSignalExceptionFocus(0, &ulTimes);
    }
#endif

    while (!ap_graceful_stop_signalled()) {
	BUFF *conn_io;

	/* Prepare to receive a SIGUSR1 due to graceful restart so that
	 * we can exit cleanly.
	 */
	usr1_just_die = 1;
	ap_signal(SIGUSR1, usr1_handler);

	/*
	 * (Re)initialize this child to a pre-connection state.
	 */

	current_conn = NULL;

	ap_clear_pool(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(my_child_num, SERVER_READY, (request_rec *) NULL);

	/*
	 * Wait for an acceptable connection to arrive.
	 */

	/* Lock around "accept", if necessary */
	SAFE_ACCEPT(accept_mutex_on());

	for (;;) {
	    if (ap_listeners->next) {
		/* more than one socket */
		memcpy(&main_fds, &listenfds, sizeof(fd_set));
		srv = select(listenmaxfd + 1, &main_fds, NULL, NULL, NULL);

		if (srv < 0 && errno != EINTR) {
		    /* 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, errno, ap_server_conf, "select: (listen)");
		    clean_child_exit(1);
		}

		if (srv <= 0)
		    continue;

		/* we remember the last_lr we searched last time around so that
		   we don't end up starving any particular listening socket */
		if (last_lr == NULL) {
		    lr = ap_listeners;
		}
		else {
		    lr = last_lr->next;
		    if (!lr)
			lr = ap_listeners;
		}
		first_lr=lr;
		do {
                    ap_get_os_sock(&sockdes, lr->sd);
		    if (FD_ISSET(sockdes, &main_fds))
			goto got_listener;
		    lr = lr->next;
		    if (!lr)
			lr = ap_listeners;
		}
		while (lr != first_lr);
		/* FIXME: if we get here, something bad has happened, and we're
		   probably gonna spin forever.
		*/
		continue;
	got_listener:
		last_lr = lr;
		sd = lr->sd;
	    }
	    else {
		/* only one socket, just pretend we did the other stuff */
		sd = ap_listeners->sd;
	    }

	    /* if we accept() something we don't want to die, so we have to
	     * defer the exit
	     */
	    usr1_just_die = 0;
	    for (;;) {
		if (deferred_die) {
		    /* we didn't get a socket, and we were told to die */
		    clean_child_exit(0);
		}
		stat = ap_accept(&csd, sd, ptrans);
		if (stat == APR_SUCCESS || stat != APR_EINTR)
		    break;
	    }

	    if (stat == APR_SUCCESS)
		break;		/* We have a socket ready for reading */
	    else {

/* TODO: this accept result handling stuff should be abstracted...
 * it's already out of date between the various unix mpms
 */
		/* Our old behaviour here was to continue after accept()
		 * errors.  But this leads us into lots of troubles
		 * because most of the errors are quite fatal.  For
		 * example, EMFILE can be caused by slow descriptor
		 * leaks (say in a 3rd party module, or libc).  It's
		 * foolish for us to continue after an EMFILE.  We also
		 * seem to tickle kernel bugs on some platforms which
		 * lead to never-ending loops here.  So it seems best
		 * to just exit in most cases.
		 */
                switch (stat) {
#ifdef EPROTO
		    /* EPROTO on certain older kernels really means
		     * ECONNABORTED, so we need to ignore it for them.
		     * See discussion in new-httpd archives nh.9701
		     * search for EPROTO.
		     *
		     * Also see nh.9603, search for EPROTO:
		     * There is potentially a bug in Solaris 2.x x<6,
		     * and other boxes that implement tcp sockets in
		     * userland (i.e. on top of STREAMS).  On these
		     * systems, EPROTO can actually result in a fatal
		     * loop.  See PR#981 for example.  It's hard to
		     * handle both uses of EPROTO.
		     */
                case EPROTO:
#endif
#ifdef ECONNABORTED
                case ECONNABORTED:
#endif
		    /* Linux generates the rest of these, other tcp
		     * stacks (i.e. bsd) tend to hide them behind
		     * getsockopt() interfaces.  They occur when
		     * the net goes sour or the client disconnects
		     * after the three-way handshake has been done
		     * in the kernel but before userland has picked
		     * up the socket.
		     */
#ifdef ECONNRESET
                case ECONNRESET:
#endif
#ifdef ETIMEDOUT
                case ETIMEDOUT:
#endif
#ifdef EHOSTUNREACH
		case EHOSTUNREACH:
#endif
#ifdef ENETUNREACH
		case ENETUNREACH:
#endif
                    break;
#ifdef ENETDOWN
		case ENETDOWN:
		     /*
		      * When the network layer has been shut down, there
		      * is not much use in simply exiting: the parent
		      * would simply re-create us (and we'd fail again).
		      * Use the CHILDFATAL code to tear the server down.
		      * @@@ Martin's idea for possible improvement:
		      * A different approach would be to define
		      * a new APEXIT_NETDOWN exit code, the reception
		      * of which would make the parent shutdown all
		      * children, then idle-loop until it detected that
		      * the network is up again, and restart the children.
		      * Ben Hyde noted that temporary ENETDOWN situations
		      * occur in mobile IP.
		      */
		    ap_log_error(APLOG_MARK, APLOG_EMERG, stat, ap_server_conf,
			"ap_accept: giving up.");
		    clean_child_exit(APEXIT_CHILDFATAL);
#endif /*ENETDOWN*/

#ifdef TPF
		case EINACT:
		    ap_log_error(APLOG_MARK, APLOG_EMERG, stat, ap_server_conf,
			"offload device inactive");
		    clean_child_exit(APEXIT_CHILDFATAL);
		    break;
		default:
		    ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_ERR, 0, ap_server_conf,
			"select/accept error (%u)", stat);
		    clean_child_exit(APEXIT_CHILDFATAL);
#else
		default:
		    ap_log_error(APLOG_MARK, APLOG_ERR, stat, ap_server_conf,
				"ap_accept: (client socket)");
		    clean_child_exit(1);
#endif
		}
	    }

	    if (ap_graceful_stop_signalled()) {
		clean_child_exit(0);
	    }
	    usr1_just_die = 1;
	}

	SAFE_ACCEPT(accept_mutex_off());	/* unlock after "accept" */

	/* We've got a socket, let's at least process one request off the
	 * socket before we accept a graceful restart request.  We set
	 * the signal to ignore because we don't want to disturb any
	 * third party code.
	 */
	ap_signal(SIGUSR1, SIG_IGN);
	/*
	 * We now have a connection, so set it up with the appropriate
	 * socket options, file descriptors, and read/write buffers.
	 */

        ap_get_os_sock(&sockdes, csd);

        if (sockdes >= 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)", 
                         sockdes, FD_SETSIZE);
	    ap_close_socket(csd);
	    continue;
        }

#ifdef TPF
	if (sockdes == 0)                   /* 0 is invalid socket for TPF */
	    continue;
#endif

	sock_disable_nagle(sockdes);

	iol = unix_attach_socket(csd);
	(void) ap_update_child_status(my_child_num, SERVER_BUSY_READ,
				   (request_rec *) NULL);

	conn_io = ap_bcreate(ptrans, B_RDWR);

	ap_bpush_iol(conn_io, iol);

	current_conn = ap_new_apr_connection(ptrans, ap_server_conf, conn_io, csd,
					 my_child_num);

	ap_process_connection(current_conn);
        ap_lingering_close(current_conn);
    }
}


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

    if (slot + 1 > ap_max_daemons_limit) {
	ap_max_daemons_limit = slot + 1;
    }

    if (one_process) {
	ap_signal(SIGHUP, just_die);
	ap_signal(SIGINT, just_die);
#ifdef SIGQUIT
	ap_signal(SIGQUIT, SIG_DFL);
#endif
	ap_signal(SIGTERM, just_die);
	child_main(slot);
    }

    (void) ap_update_child_status(slot, 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(slot, 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 AIX_BIND_PROCESSOR
/* by default AIX binds to a single processor
 * this bit unbinds children which will then bind to another cpu
 */
#include <sys/processor.h>
	int status = bindprocessor(BINDPROCESS, (int)getpid(), 
				   PROCESSOR_CLASS_ANY);
	if (status != OK) {
	    ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_WARNING, ap_server_conf,
			"processor unbind failed %d", status);
	}
#endif
	RAISE_SIGSTOP(MAKE_CHILD);
	/* Disable the restart signal handlers and enable the just_die stuff.
	 * Note that since restart() just notes that a restart has been
	 * requested there's no race condition here.
	 */
	ap_signal(SIGHUP, just_die);
	ap_signal(SIGUSR1, just_die);
	ap_signal(SIGTERM, just_die);
	child_main(slot);
    }

    ap_scoreboard_image->parent[slot].pid = pid;
#ifdef SCOREBOARD_FILE
    lseek(scoreboard_fd, XtOffsetOf(scoreboard, parent[slot]), 0);
    force_write(scoreboard_fd, &ap_scoreboard_image->parent[slot],
		sizeof(parent_score));
#endif

    return 0;
}


/* start up a bunch of children */
static void startup_children(int number_to_start)
{
    int i;
    time_t now = time(0);

    for (i = 0; number_to_start && i < ap_daemons_limit; ++i) {
	if (ap_scoreboard_image->servers[i].status != SERVER_DEAD) {
	    continue;
	}
	if (make_child(ap_server_conf, i, now) < 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(void)
{
    int i;
    int to_kill;
    int idle_count;
    short_score *ss;
    time_t now = time(0);
    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;

    ap_sync_scoreboard_image();
    for (i = 0; i < ap_daemons_limit; ++i) {
	int status;

	if (i >= ap_max_daemons_limit && free_length == idle_spawn_rate)
	    break;
	ss = &ap_scoreboard_image->servers[i];
	status = ss->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 SIGUSR1 because that'll cause it to
	 * shut down gracefully, in case it happened to pick up a request
	 * while we were counting
	 */
	kill(ap_scoreboard_image->parent[to_kill].pid, SIGUSR1);
	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_NOERRNO|APLOG_ERR, 0, ap_server_conf,
			    "server reached MaxClients setting, consider"
			    " raising the MaxClients setting");
		reported = 1;
	    }
	    idle_spawn_rate = 1;
	}
	else {
	    if (idle_spawn_rate >= 8) {
		ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_INFO, 0, ap_server_conf,
		    "server seems busy, (you may need "
		    "to increase StartServers, 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], now) == -1) {
            if(free_length == 1) {
                shutdown_pending = 1;
                ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_EMERG, 0, ap_server_conf,
                "No active child processes: shutting down");
            }
        }
#else
		make_child(ap_server_conf, free_slots[i], now);
#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;
    }
}


static void process_child_status(ap_proc_t *pid, ap_wait_t status)
{
    /* Child died... if it died due to a fatal error,
	* we should simply bail out.
	*/
    if ((WIFEXITED(status)) &&
	WEXITSTATUS(status) == APEXIT_CHILDFATAL) {
	ap_log_error(APLOG_MARK, APLOG_ALERT|APLOG_NOERRNO, 0, ap_server_conf,
			"Child %ld returned a Fatal error... \n"
			"Apache is exiting!",
			(long)pid->pid);
	exit(APEXIT_CHILDFATAL);
    }
    if (WIFSIGNALED(status)) {
	switch (WTERMSIG(status)) {
	case SIGTERM:
	case SIGHUP:
	case SIGUSR1:
	case SIGKILL:
	    break;
	default:
#ifdef SYS_SIGLIST
#ifdef WCOREDUMP
	    if (WCOREDUMP(status)) {
		ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_NOTICE,
			     0, ap_server_conf,
			     "child pid %ld exit signal %s (%d), "
			     "possible coredump in %s",
			     (long)pid->pid, (WTERMSIG(status) >= NumSIG) ? "" : 
			     SYS_SIGLIST[WTERMSIG(status)], WTERMSIG(status),
			     ap_coredump_dir);
	    }
	    else {
#endif
		ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_NOTICE,
			     0, ap_server_conf,
			     "child pid %ld exit signal %s (%d)", (long)pid->pid,
			     SYS_SIGLIST[WTERMSIG(status)], WTERMSIG(status));
#ifdef WCOREDUMP
	    }
#endif
#else
	    ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_NOTICE,
			 0, ap_server_conf,
			 "child pid %ld exit signal %d",
			 (long)pid->pid, WTERMSIG(status));
#endif
	}
    }
}


static int setup_listeners(server_rec *s)
{
    ap_listen_rec *lr;
    int sockdes;

    if (ap_listen_open(s->process, s->port)) {
	ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_ALERT, 0, s,
		    "no listening sockets available, shutting down");
	return -1;
    }

    listenmaxfd = -1;
    FD_ZERO(&listenfds);
    for (lr = ap_listeners; lr; lr = lr->next) {
        ap_get_os_sock(&sockdes, lr->sd);
	FD_SET(sockdes, &listenfds);
	if (sockdes > listenmaxfd) {
	    listenmaxfd = sockdes;
	}
    }
    return 0;
}

/* Useful to erase the status of children that might be from previous
 * generations */
static void ap_prefork_force_reset_connection_status(long conn_id)
{
    int i;

    for (i = 0; i < STATUSES_PER_CONNECTION; i++) {
        ap_new_scoreboard_image->table[conn_id][i].key[0] = '\0';
    }                                                                           }

void ap_reset_connection_status(long conn_id)
{
    if (maintain_connection_status) {
        ap_prefork_force_reset_connection_status(conn_id);
    }
}

/*****************************************************************
 * Executive routines.
 */

int ap_mpm_run(ap_pool_t *_pconf, ap_pool_t *plog, server_rec *s)
{
    int remaining_children_to_start;

    pconf = _pconf;

    ap_server_conf = s;
 
    ap_log_pid(pconf, ap_pid_fname);

    if (setup_listeners(s)) {
	/* XXX: hey, what's the right way for the mpm to indicate a fatal error? */
	return 1;
    }

    SAFE_ACCEPT(accept_mutex_init(pconf));
    if (!is_graceful) {
	reinit_scoreboard(pconf);
    }
#ifdef SCOREBOARD_FILE
    else {
	ap_scoreboard_fname = ap_server_root_relative(pconf, ap_scoreboard_fname);
	ap_note_cleanups_for_fd(pconf, scoreboard_fd);
    }
#endif

    set_signals();

    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 SIGUSR1).  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_NOERRNO|APLOG_NOTICE, 0, ap_server_conf,
		"%s configured -- resuming normal operations",
		ap_get_server_version());
    ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_INFO, 0, ap_server_conf,
		"Server built: %s", ap_get_server_built());
    restart_pending = shutdown_pending = 0;

    while (!restart_pending && !shutdown_pending) {
	int child_slot;
	ap_wait_t status;
        /* this is a memory leak, but I'll fix it later. */
	ap_proc_t pid;

        ap_wait_or_timeout(&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) {
	    process_child_status(&pid, status);
	    /* non-fatal death... note that it's gone in the scoreboard. */
	    ap_sync_scoreboard_image();
	    child_slot = find_child_by_pid(&pid);
	    if (child_slot >= 0) {
                ap_prefork_force_reset_connection_status(child_slot);
		(void) ap_update_child_status(child_slot, SERVER_DEAD,
					    (request_rec *) NULL);
		if (remaining_children_to_start
		    && child_slot < ap_daemons_limit) {
		    /* we're still doing a 1-for-1 replacement of dead
			* children with new children
			*/
		    make_child(ap_server_conf, child_slot, time(0));
		    --remaining_children_to_start;
		}
#ifdef APR_HAS_OTHER_CHILD
	    }
	    else if (ap_reap_other_child(&pid, status) == 0) {
		/* handled */
#endif
	    }
	    else if (is_graceful) {
		/* Great, we've probably just lost a slot in the
		    * scoreboard.  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.
		*/
	    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();
#ifdef TPF
    shutdown_pending = os_check_server(tpf_server_name);
    ap_check_signals();
    sleep(1);
#endif /*TPF */
    }

    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_NOERRNO|APLOG_INFO,
				0, ap_server_conf,
				"removed PID file %s (pid=%ld)",
				pidfile, (long)getpid());
	}

	ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_NOTICE, 0, ap_server_conf,
		    "caught SIGTERM, shutting down");
	return 1;
    }

    /* we've been told to restart */
    ap_signal(SIGHUP, SIG_IGN);
    ap_signal(SIGUSR1, 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;
    update_scoreboard_global();

    if (is_graceful) {
#ifndef SCOREBOARD_FILE
	int i;
#endif
	ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_NOTICE, 0, ap_server_conf,
		    "SIGUSR1 received.  Doing graceful restart");

	/* kill off the idle ones */
	if (unixd_killpg(getpgrp(), SIGUSR1) < 0) {
	    ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, "killpg SIGUSR1");
	}
#ifndef SCOREBOARD_FILE
	/* This is mostly for debugging... so that we know what is still
	    * gracefully dealing with existing request.  But we can't really
	    * do it if we're in a SCOREBOARD_FILE because it'll cause
	    * corruption too easily.
	    */
	ap_sync_scoreboard_image();
	for (i = 0; i < ap_daemons_limit; ++i) {
	    if (ap_scoreboard_image->servers[i].status != SERVER_DEAD) {
		ap_scoreboard_image->servers[i].status = SERVER_GRACEFUL;
	    }
	}
#endif
    }
    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_NOERRNO|APLOG_NOTICE, 0, ap_server_conf,
		    "SIGHUP received.  Attempting to restart");
    }

    if (!is_graceful) {
	ap_restart_time = time(NULL);
    }

    return 0;
}

static void prefork_pre_config(ap_pool_t *p, ap_pool_t *plog, ap_pool_t *ptemp)
{
    static int restart_num = 0;

    one_process = !!getenv("ONE_PROCESS");

    /* sigh, want this only the second time around */
    if (restart_num++ == 1) {
	is_graceful = 0;

	if (!one_process) {
	    ap_detach();
	}

	ap_my_pid = getpid();
    }

    unixd_pre_config();
    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 = HARD_SERVER_LIMIT;
    ap_pid_fname = DEFAULT_PIDLOG;
    ap_scoreboard_fname = DEFAULT_SCOREBOARD;
    ap_lock_fname = DEFAULT_LOCKFILE;
    ap_max_requests_per_child = DEFAULT_MAX_REQUESTS_PER_CHILD;
    ap_extended_status = 0;

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

static void prefork_hooks(void)
{
    INIT_SIGLIST();
#ifdef AUX3
    (void) set42sig();
#endif
    /* TODO: set one_process properly */ one_process = 0;

    ap_hook_pre_config(prefork_pre_config, NULL, NULL, AP_HOOK_MIDDLE);
}

static const char *set_pidfile(cmd_parms *cmd, void *dummy, const char *arg) 
{
    const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
    if (err != NULL) {
        return err;
    }

    if (cmd->server->is_virtual) {
	return "PidFile directive not allowed in <VirtualHost>";
    }
    ap_pid_fname = arg;
    return NULL;
}

static const char *set_scoreboard(cmd_parms *cmd, void *dummy, const char *arg) 
{
    const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
    if (err != NULL) {
        return err;
    }

    ap_scoreboard_fname = arg;
    return NULL;
}

static const char *set_lockfile(cmd_parms *cmd, void *dummy, const char *arg) 
{
    const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
    if (err != NULL) {
        return err;
    }

    ap_lock_fname = arg;
    return NULL;
}

static const char *set_daemons_to_start(cmd_parms *cmd, void *dummy, const char *arg) 
{
    const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
    if (err != NULL) {
        return err;
    }

    ap_daemons_to_start = atoi(arg);
    return NULL;
}

static const char *set_min_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 | APLOG_NOERRNO, 0, NULL, 
                    "WARNING: detected MinSpareServers 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.");
       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_server_limit (cmd_parms *cmd, void *dummy, const char *arg) 
{
    const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
    if (err != NULL) {
        return err;
    }

    ap_daemons_limit = atoi(arg);
    if (ap_daemons_limit > HARD_SERVER_LIMIT) {
       ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL, 
                    "WARNING: MaxClients of %d exceeds compile time limit "
                    "of %d servers,", ap_daemons_limit, HARD_SERVER_LIMIT);
       ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL, 
                    " lowering MaxClients to %d.  To increase, please "
                    "see the", HARD_SERVER_LIMIT);
       ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
                    " HARD_SERVER_LIMIT define in %s.",
                    AP_MPM_HARD_LIMITS_FILE);
       ap_daemons_limit = HARD_SERVER_LIMIT;
    } 
    else if (ap_daemons_limit < 1) {
	ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL, 
                     "WARNING: Require MaxClients > 0, setting to 1");
	ap_daemons_limit = 1;
    }
    return NULL;
}

static const char *set_max_requests(cmd_parms *cmd, void *dummy, const char *arg) 
{
    const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
    if (err != NULL) {
        return err;
    }

    ap_max_requests_per_child = atoi(arg);

    return NULL;
}

static const char *set_coredumpdir (cmd_parms *cmd, void *dummy, const char *arg) 
{
    ap_finfo_t finfo;
    const char *fname;
    const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
    if (err != NULL) {
        return err;
    }

    fname = ap_server_root_relative(cmd->pool, arg);
    if ((ap_stat(&finfo, fname, cmd->pool) != APR_SUCCESS) || 
        (finfo.filetype != APR_DIR)) {
	return ap_pstrcat(cmd->pool, "CoreDumpDirectory ", fname, 
			  " does not exist or is not a directory", NULL);
    }
    ap_cpystrn(ap_coredump_dir, fname, sizeof(ap_coredump_dir));
    return NULL;
}

/* Stub functions until this MPM supports the connection status API */
/* Don't mess with the string you get back from this function */
const char *ap_get_connection_status(long conn_id, const char *key)
{
    int i = 0;
    status_table_entry *ss;

    if (!maintain_connection_status) return "";
    while (i < STATUSES_PER_CONNECTION) {
        ss = &(ap_new_scoreboard_image->table[conn_id][i]);
        if (ss->key[0] == '\0') {
            break;
        }
        if (0 == strcmp(ss->key, key)) {
            return ss->value;
        }
    }

    return NULL;
}

ap_array_header_t *ap_get_connections(ap_pool_t *p)
{
    int i;
    ap_array_header_t *connection_list;
    long *array_slot;

    connection_list = ap_make_array(p, 0, sizeof(long));
    /* We assume that there is a connection iff it has an entry in the status
     * table. Connections without any status sound problematic to me, so this
     * is probably for the best. - manoj */
    for (i = 0; i < ap_max_daemons_limit; i++) {
         if (ap_new_scoreboard_image->table[i][0].key[0] != '\0') {
            array_slot = ap_push_array(connection_list);
            *array_slot = i;
        }
    }
    return connection_list;
}

ap_array_header_t *ap_get_connection_keys(ap_pool_t *p, long conn_id)
{
    int i = 0;
    status_table_entry *ss;
    ap_array_header_t *key_list;
    char **array_slot;

    key_list = ap_make_array(p, 0, KEY_LENGTH * sizeof(char));
    while (i < STATUSES_PER_CONNECTION) {
        ss = &(ap_new_scoreboard_image->table[conn_id][i]);
        if (ss->key[0] == '\0') {
            break;
        }
        array_slot = ap_push_array(key_list);
        *array_slot = ap_pstrdup(p, ss->key);
        i++;
    }
    return key_list;
}

/* Note: no effort is made here to prevent multiple threads from messing with
 * a single connection at the same time. ap_update_connection_status should
 * only be called by the thread that owns the connection */

void ap_update_connection_status(long conn_id, const char *key,
                                 const char *value)
{
    int i = 0;
    status_table_entry *ss;

    if (!maintain_connection_status) return;
    while (i < STATUSES_PER_CONNECTION) {
        ss = &(ap_new_scoreboard_image->table[conn_id][i]);
        if (ss->key[0] == '\0') {
            break;
        }
        if (0 == strcmp(ss->key, key)) {
            ap_cpystrn(ss->value, value, VALUE_LENGTH);
            return;
        }
        i++;
    }
    /* Not found. Add an entry for this value */
    if (i >= STATUSES_PER_CONNECTION) {
        /* No room. Oh well, not much anyone can do about it. */
        return;
    }
    ap_cpystrn(ss->key, key, KEY_LENGTH);
    ap_cpystrn(ss->value, value, VALUE_LENGTH);
    return;
}

ap_array_header_t *ap_get_status_table(ap_pool_t *p)
{
    int i, j;
    ap_array_header_t *server_status;
    ap_status_table_row_t *array_slot;
    status_table_entry *ss;

    server_status = ap_make_array(p, 0, sizeof(ap_status_table_row_t));

    /* Go ahead and return what's in the connection status table even if we
     * aren't maintaining it. We can at least look at what children from
     * previous generations are up to. */

    for (i = 0; i < ap_max_daemons_limit; i++) {
        if (ap_new_scoreboard_image->table[i][0].key[0] == '\0')
            continue;
        array_slot = ap_push_array(server_status);
        array_slot->data = ap_make_table(p, 0);
        array_slot->conn_id = i;

        for (j = 0; j < STATUSES_PER_CONNECTION; j++) {
            ss = &(ap_new_scoreboard_image->table[i][j]);
            if (ss->key[0] != '\0') {
                ap_table_add(array_slot->data, ss->key, ss->value);
            }
            else {
                break;
            }
        }
    }
    return server_status;
}

static const command_rec prefork_cmds[] = {
UNIX_DAEMON_COMMANDS
LISTEN_COMMANDS
AP_INIT_TAKE1("PidFile", set_pidfile, NULL, RSRC_CONF,
              "A file for logging the server process ID"),
AP_INIT_TAKE1("ScoreBoardFile", set_scoreboard, NULL, RSRC_CONF,
              "A file for Apache to maintain runtime process management information"),
AP_INIT_TAKE1("LockFile", set_lockfile, NULL, RSRC_CONF,
              "The lockfile used when Apache needs to lock the accept() call"),
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_server_limit, NULL, RSRC_CONF,
              "Maximum number of children alive at the same time"),
AP_INIT_TAKE1("MaxRequestsPerChild", set_max_requests, NULL, RSRC_CONF,
              "Maximum number of requests a particular child serves before dying."),
AP_INIT_TAKE1("CoreDumpDirectory", set_coredumpdir, NULL, RSRC_CONF,
              "The location of the directory Apache changes to before dumping core"),
{ NULL }
};

module MODULE_VAR_EXPORT mpm_prefork_module = {
    MPM20_MODULE_STUFF,
    NULL,                       /* 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 ap_table_t */
    NULL,			/* handlers */
    prefork_hooks,		/* register hooks */
};