httpd/server/main.c

	main.c revision 51f9c50e4116dba10d9bf9bedf921272b88b9c9e
/* ====================================================================
 * 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
 *    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.h"
#include "apr_strings.h"
#include "apr_getopt.h"
#include "apr_general.h"
#include "apr_lib.h"

#define APR_WANT_STDIO
#define APR_WANT_STRFUNC
#include "apr_want.h"

#define CORE_PRIVATE
#include "ap_config.h"
#include "httpd.h"
#include "http_main.h"
#include "http_log.h"
#include "http_config.h"
#include "http_vhost.h"
#include "apr_uri.h"
#include "util_ebcdic.h"
#include "ap_mpm.h"

/* WARNING: Win32 binds http_main.c dynamically to the server. Please place
 *          extern functions and global data in another appropriate module.
 *
 * Most significant main() global data can be found in http_config.c
 */

/* XXX - We should be able to grab the per-MPM settings here too */
static void show_compile_settings(void)
{
    printf("Server version: %s\n", ap_get_server_version());
    printf("Server built:   %s\n", ap_get_server_built());
    printf("Server's Module Magic Number: %u:%u\n",
           MODULE_MAGIC_NUMBER_MAJOR, MODULE_MAGIC_NUMBER_MINOR);

    /* sizeof(foo) is long on some platforms so we might as well
     * make it long everywhere to keep the printf format
     * consistent
     */
    printf("Architecture:   %ld-bit\n", 8 * (long)sizeof(void *));
    printf("Server compiled with....\n");
#ifdef BIG_SECURITY_HOLE
    printf(" -D BIG_SECURITY_HOLE\n");
#endif

#ifdef SECURITY_HOLE_PASS_AUTHORIZATION
    printf(" -D SECURITY_HOLE_PASS_AUTHORIZATION\n");
#endif

#ifdef APACHE_MPM_DIR
    printf(" -D APACHE_MPM_DIR=\"%s\"\n", APACHE_MPM_DIR);
#endif

#ifdef HAVE_SHMGET
    printf(" -D HAVE_SHMGET\n");
#endif

#if APR_FILE_BASED_SHM
    printf(" -D APR_FILE_BASED_SHM\n");
#endif

#if APR_HAS_SENDFILE
    printf(" -D APR_HAS_SENDFILE\n");
#endif

#if APR_HAS_MMAP
    printf(" -D APR_HAS_MMAP\n");
#endif

#ifdef NO_WRITEV
    printf(" -D NO_WRITEV\n");
#endif

#ifdef NO_LINGCLOSE
    printf(" -D NO_LINGCLOSE\n");
#endif

#if APR_HAVE_IPV6
    printf(" -D APR_HAVE_IPV6\n");
#endif

#if APR_USE_FLOCK_SERIALIZE
    printf(" -D APR_USE_FLOCK_SERIALIZE\n");
#endif

#if APR_USE_SYSVSEM_SERIALIZE
    printf(" -D APR_USE_SYSVSEM_SERIALIZE\n");
#endif

#if APR_USE_FCNTL_SERIALIZE
    printf(" -D APR_USE_FCNTL_SERIALIZE\n");
#endif

#if APR_USE_PROC_PTHREAD_SERIALIZE
    printf(" -D APR_USE_PROC_PTHREAD_SERIALIZE\n");
#endif

#if APR_USE_PTHREAD_SERIALIZE
    printf(" -D APR_USE_PTHREAD_SERIALIZE\n");
#endif

#if APR_PROCESS_LOCK_IS_GLOBAL
    printf(" -D APR_PROCESS_LOCK_IS_GLOBAL\n");
#endif

#ifdef SINGLE_LISTEN_UNSERIALIZED_ACCEPT
    printf(" -D SINGLE_LISTEN_UNSERIALIZED_ACCEPT\n");
#endif

#if APR_HAS_OTHER_CHILD
    printf(" -D APR_HAS_OTHER_CHILD\n");
#endif

#ifdef AP_HAVE_RELIABLE_PIPED_LOGS
    printf(" -D AP_HAVE_RELIABLE_PIPED_LOGS\n");
#endif

#ifdef BUFFERED_LOGS
    printf(" -D BUFFERED_LOGS\n");
#ifdef PIPE_BUF
    printf(" -D PIPE_BUF=%ld\n",(long)PIPE_BUF);
#endif
#endif

#if APR_CHARSET_EBCDIC
    printf(" -D APR_CHARSET_EBCDIC\n");
#endif

#ifdef APACHE_XLATE
    printf(" -D APACHE_XLATE\n");
#endif

#ifdef NEED_HASHBANG_EMUL
    printf(" -D NEED_HASHBANG_EMUL\n");
#endif

#ifdef SHARED_CORE
    printf(" -D SHARED_CORE\n");
#endif

/* This list displays the compiled in default paths: */
#ifdef HTTPD_ROOT
    printf(" -D HTTPD_ROOT=\"" HTTPD_ROOT "\"\n");
#endif

#ifdef SUEXEC_BIN
    printf(" -D SUEXEC_BIN=\"" SUEXEC_BIN "\"\n");
#endif

#if defined(SHARED_CORE) && defined(SHARED_CORE_DIR)
    printf(" -D SHARED_CORE_DIR=\"" SHARED_CORE_DIR "\"\n");
#endif

#ifdef DEFAULT_PIDLOG
    printf(" -D DEFAULT_PIDLOG=\"" DEFAULT_PIDLOG "\"\n");
#endif

#ifdef DEFAULT_SCOREBOARD
    printf(" -D DEFAULT_SCOREBOARD=\"" DEFAULT_SCOREBOARD "\"\n");
#endif

#ifdef DEFAULT_LOCKFILE
    printf(" -D DEFAULT_LOCKFILE=\"" DEFAULT_LOCKFILE "\"\n");
#endif

#ifdef DEFAULT_ERRORLOG
    printf(" -D DEFAULT_ERRORLOG=\"" DEFAULT_ERRORLOG "\"\n");
#endif

#ifdef TYPES_CONFIG_FILE
    printf(" -D TYPES_CONFIG_FILE=\"" TYPES_CONFIG_FILE "\"\n");
#endif

#ifdef SERVER_CONFIG_FILE
    printf(" -D SERVER_CONFIG_FILE=\"" SERVER_CONFIG_FILE "\"\n");
#endif
}

static void destroy_and_exit_process(process_rec *process,
                                     int process_exit_value)
{
    apr_pool_destroy(process->pool); /* and destroy all descendent pools */
    apr_terminate();
    exit(process_exit_value);
}

static process_rec *create_process(int argc, const char * const *argv)
{
    process_rec *process;
    apr_pool_t *cntx;
    apr_status_t stat;

    stat = apr_pool_create(&cntx, NULL);
    if (stat != APR_SUCCESS) {
        /* XXX From the time that we took away the NULL pool->malloc mapping
         *     we have been unable to log here without segfaulting.
         */
        ap_log_error(APLOG_MARK, APLOG_ERR, stat, NULL,
                     "apr_pool_create() failed to create "
                     "initial context");
        apr_terminate();
        exit(1);
    }

    apr_pool_tag(cntx, "process");
    ap_open_stderr_log(cntx);

    process = apr_palloc(cntx, sizeof(process_rec));
    process->pool = cntx;

    apr_pool_create(&process->pconf, process->pool);
    apr_pool_tag(process->pconf, "pconf");
    process->argc = argc;
    process->argv = argv;
    process->short_name = apr_filename_of_pathname(argv[0]);
    return process;
}

static void usage(process_rec *process)
{
    const char *bin = process->argv[0];
    char pad[MAX_STRING_LEN];
    unsigned i;

    for (i = 0; i < strlen(bin); i++) {
        pad[i] = ' ';
    }

    pad[i] = '\0';

#ifdef SHARED_CORE
    ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL ,
                 "Usage: %s [-R directory] [-D name] [-d directory] [-f file]",
                 bin);
#else
    ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
                 "Usage: %s [-D name] [-d directory] [-f file]", bin);
#endif

    ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
                 "       %s [-C \"directive\"] [-c \"directive\"]", pad);

#ifdef WIN32
    ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
                 "       %s [-k restart|shutdown|start]", pad);
    ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
                 "       %s [-n service_name]", pad);
    ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
                 "       %s [-i] [-u]", pad);
#endif

    ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
                 "       %s [-v] [-V] [-h] [-l] [-L] [-t] [-T]", pad);
    ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
                 "Options:");

#ifdef SHARED_CORE
    ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
                 "  -R directory      : specify an alternate location for "
                 "shared object files");
#endif

    ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
                 "  -D name           : define a name for use in "
                 "<IfDefine name> directives");
    ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
                 "  -d directory      : specify an alternate initial "
                 "ServerRoot");
    ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
                 "  -f file           : specify an alternate ServerConfigFile");
    ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
                 "  -C \"directive\"    : process directive before reading "
                 "config files");
    ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
                 "  -c \"directive\"    : process directive after reading "
                 "config files");

#ifdef WIN32
    ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
                 "  -n name           : set service name and use its "
                 "ServerConfigFile");
    ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
                 "  -k shutdown       : tell running Apache to shutdown");
    ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
                 "  -k restart        : tell running Apache to do a graceful "
                 "restart");
    ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
                 "  -k start          : tell Apache to start");
    ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
                 "  -i                : install an Apache service");
    ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
                 "  -u                : uninstall an Apache service");
#endif

    ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
                 "  -e level          : show startup errors of level "
                 "(see LogLevel)");
    ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
                 "  -v                : show version number");
    ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
                 "  -V                : show compile settings");
    ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
                 "  -h                : list available command line options "
                 "(this page)");
    ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
                 "  -l                : list compiled in modules");
    ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
                 "  -L                : list available configuration "
                 "directives");
    ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
                 "  -t -D DUMP_VHOSTS : show parsed settings (currently only "
                 "vhost settings)");
    ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
                 "  -t                : run syntax check for config files "
                 "(with docroot check)");
    ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
                 "  -T                : run syntax check for config files "
                 "(without docroot check)");

    destroy_and_exit_process(process, 1);
}

int main(int argc, const char * const argv[])
{
    char c;
    int configtestonly = 0;
    const char *confname = SERVER_CONFIG_FILE;
    const char *def_server_root = HTTPD_ROOT;
    process_rec *process;
    server_rec *server_conf;
    apr_pool_t *pglobal;
    apr_pool_t *pconf;
    apr_pool_t *plog; /* Pool of log streams, reset _after_ each read of conf */
    apr_pool_t *ptemp; /* Pool for temporary config stuff, reset often */
    apr_pool_t *pcommands; /* Pool for -D, -C and -c switches */
    apr_getopt_t *opt;
    apr_status_t rv;
    module **mod;
    const char *optarg;

    AP_MONCONTROL(0); /* turn of profiling of startup */

    apr_initialize();

    process = create_process(argc, argv);
    pglobal = process->pool;
    pconf = process->pconf;
    ap_server_argv0 = process->short_name;

#if APR_CHARSET_EBCDIC
    if (ap_init_ebcdic(pglobal) != APR_SUCCESS) {
        destroy_and_exit_process(process, 1);
    }
#endif

    ap_setup_prelinked_modules(process);

    apr_pool_create(&pcommands, pglobal);
    apr_pool_tag(pcommands, "pcommands");
    ap_server_pre_read_config  = apr_array_make(pcommands, 1, sizeof(char *));
    ap_server_post_read_config = apr_array_make(pcommands, 1, sizeof(char *));
    ap_server_config_defines   = apr_array_make(pcommands, 1, sizeof(char *));

    ap_run_rewrite_args(process);

    /* Maintain AP_SERVER_BASEARGS list in http_main.h to allow the MPM
     * to safely pass on our args from its rewrite_args() handler.
     */
    apr_getopt_init(&opt, pcommands, process->argc, process->argv);

    while ((rv = apr_getopt(opt, AP_SERVER_BASEARGS, &c, &optarg))
            == APR_SUCCESS) {
        char **new;

        switch (c) {
        case 'c':
            new = (char **)apr_array_push(ap_server_post_read_config);
            *new = apr_pstrdup(pcommands, optarg);
            break;

        case 'C':
            new = (char **)apr_array_push(ap_server_pre_read_config);
            *new = apr_pstrdup(pcommands, optarg);
            break;

        case 'd':
            def_server_root = optarg;
            break;

        case 'D':
            new = (char **)apr_array_push(ap_server_config_defines);
            *new = apr_pstrdup(pcommands, optarg);
            break;

        case 'e':
            if (strcasecmp(optarg, "emerg") == 0) {
                ap_default_loglevel = APLOG_EMERG;
            }
            else if (strcasecmp(optarg, "alert") == 0) {
                ap_default_loglevel = APLOG_ALERT;
            }
            else if (strcasecmp(optarg, "crit") == 0) {
                ap_default_loglevel = APLOG_CRIT;
            }
            else if (strncasecmp(optarg, "err", 3) == 0) {
                ap_default_loglevel = APLOG_ERR;
            }
            else if (strncasecmp(optarg, "warn", 4) == 0) {
                ap_default_loglevel = APLOG_WARNING;
            }
            else if (strcasecmp(optarg, "notice") == 0) {
                ap_default_loglevel = APLOG_NOTICE;
            }
            else if (strcasecmp(optarg, "info") == 0) {
                ap_default_loglevel = APLOG_INFO;
            }
            else if (strcasecmp(optarg, "debug") == 0) {
                ap_default_loglevel = APLOG_DEBUG;
            }
            else {
                usage(process);
            }
            break;

        case 'X':
            new = (char **)apr_array_push(ap_server_config_defines);
            *new = "DEBUG";
            break;

        case 'f':
            confname = optarg;
            break;

        case 'v':
            printf("Server version: %s\n", ap_get_server_version());
            printf("Server built:   %s\n", ap_get_server_built());
            destroy_and_exit_process(process, 0);

        case 'V':
            show_compile_settings();
            destroy_and_exit_process(process, 0);

        case 'l':
            ap_show_modules();
            destroy_and_exit_process(process, 0);

        case 'L':
            ap_show_directives();
            destroy_and_exit_process(process, 0);

        case 't':
            configtestonly = 1;
            break;

        case 'h':
        case '?':
            usage(process);
        }
    }

    /* bad cmdline option?  then we die */
    if (rv != APR_EOF) {
        usage(process);
    }

    apr_pool_create(&plog, pglobal);
    apr_pool_tag(plog, "plog");
    apr_pool_create(&ptemp, pconf);

    /* Note that we preflight the config file once
     * before reading it _again_ in the main loop.
     * This allows things, log files configuration
     * for example, to settle down.
     */

    ap_server_root = def_server_root;
    server_conf = ap_read_config(process, ptemp, confname, &ap_conftree);
    if (ap_run_pre_config(pconf, plog, ptemp) != OK) {
        ap_log_error(APLOG_MARK, APLOG_STARTUP |APLOG_ERR| APLOG_NOERRNO, 0,
                     NULL, "Pre-configuration failed\n");
        destroy_and_exit_process(process, 1);
    }

    ap_process_config_tree(server_conf, ap_conftree, process->pconf, ptemp);
    ap_fixup_virtual_hosts(pconf, server_conf);
    ap_fini_vhost_config(pconf, server_conf);
    apr_sort_hooks();
    if (configtestonly) {
        ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
                     "Syntax OK\n");
        destroy_and_exit_process(process, 0);
    }

    apr_pool_clear(plog);

    /* It is assumed that if you are going to fail the open_logs phase, then
     * you will print out your own message that explains what has gone wrong.
     * The server doesn't need to do that for you.
     */
    if ( ap_run_open_logs(pconf, plog, ptemp, server_conf) != OK) {
        destroy_and_exit_process(process, 1);
    }

    if ( ap_run_post_config(pconf, plog, ptemp, server_conf) != OK) {
        ap_log_error(APLOG_MARK, APLOG_STARTUP |APLOG_ERR| APLOG_NOERRNO, 0,
                     NULL, "Configuration Failed\n");
        destroy_and_exit_process(process, 1);
    }

    apr_pool_destroy(ptemp);

    for (;;) {
        apr_hook_deregister_all();
        apr_pool_clear(pconf);

        for (mod = ap_prelinked_modules; *mod != NULL; mod++) {
            ap_register_hooks(*mod, pconf);
        }

        /* This is a hack until we finish the code so that it only reads
         * the config file once and just operates on the tree already in
         * memory.  rbb
         */
        ap_conftree = NULL;
        apr_pool_create(&ptemp, pconf);
        ap_server_root = def_server_root;
        server_conf = ap_read_config(process, ptemp, confname, &ap_conftree);
        if (ap_run_pre_config(pconf, plog, ptemp) != OK) {
            ap_log_error(APLOG_MARK, APLOG_STARTUP |APLOG_ERR| APLOG_NOERRNO,
                         0, NULL, "Pre-configuration failed\n");
            destroy_and_exit_process(process, 1);
        }

        ap_process_config_tree(server_conf, ap_conftree, process->pconf, ptemp);
        ap_fixup_virtual_hosts(pconf, server_conf);
        ap_fini_vhost_config(pconf, server_conf);
        apr_sort_hooks();
        apr_pool_clear(plog);
        if (ap_run_open_logs(pconf, plog, ptemp, server_conf) != OK) {
            ap_log_error(APLOG_MARK, APLOG_STARTUP |APLOG_ERR| APLOG_NOERRNO,
                         0, NULL, "Unable to open logs\n");
            destroy_and_exit_process(process, 1);
        }

        if (ap_run_post_config(pconf, plog, ptemp, server_conf) != OK) {
            ap_log_error(APLOG_MARK, APLOG_STARTUP |APLOG_ERR | APLOG_NOERRNO,
                         0, NULL, "Configuration Failed\n");
            destroy_and_exit_process(process, 1);
        }

        apr_pool_destroy(ptemp);
        apr_pool_lock(pconf, 1);

        ap_run_optional_fn_retrieve();

        if (ap_mpm_run(pconf, plog, server_conf))
            break;

        apr_pool_lock(pconf, 0);
    }

    apr_pool_lock(pconf, 0);
    destroy_and_exit_process(process, 0);

    return 0; /* Supress compiler warning. */
}

/* force Expat to be linked into the server executable */
#if defined(USE_EXPAT) && !defined(SHARED_CORE_BOOTSTRAP)
#include "xmlparse.h"
const XML_LChar *suck_in_expat(void);
const XML_LChar *suck_in_expat(void)
{
    return XML_ErrorString(XML_ERROR_NONE);
}
#endif /* USE_EXPAT */

#ifndef SHARED_CORE_BOOTSTRAP
/*
 * Force apr_password_validate() into the image so that modules like
 * mod_auth can use it even if they're dynamically loaded.
 */
void suck_in_apr_password_validate(void);
void suck_in_apr_password_validate(void)
{
    apr_password_validate("a", "b");
}
#endif

#ifdef AP_USING_AUTOCONF
/* This ugly little hack pulls any function referenced in exports.c into
 * the web server.  exports.c is generated during the build, and it
 * has all of the APR functions specified by the apr/apr.exports and
 * apr-util/aprutil.exports files.
 */
const void *suck_in_APR(void);
const void *suck_in_APR(void)
{
    extern const void *ap_ugly_hack;

    return ap_ugly_hack;
}
#endif