Function load_module

modules/core/mod_so.c:182–320

 */

static const char *load_module(cmd_parms *cmd, void *dummy,
                               const char *modname, const char *filename)
{
    apr_dso_handle_t *modhandle;
    apr_dso_handle_sym_t modsym;
    module *modp;
    const char *module_file;
    so_server_conf *sconf;
    ap_module_symbol_t *modi;
    ap_module_symbol_t *modie;
    int i;
    const char *error;

    /* we need to setup this value for dummy to make sure that we don't try
     * to add a non-existent tree into the build when we return to
     * execute_now.
     */
    *(ap_directive_t **)dummy = NULL;

    /*
     * check for already existing module
     * If it already exists, we have nothing to do
     * Check both dynamically-loaded modules and statically-linked modules.
     */
    sconf = (so_server_conf *)ap_get_module_config(cmd->server->module_config,
                                                &so_module);
    modie = (ap_module_symbol_t *)sconf->loaded_modules->elts;
    for (i = 0; i < sconf->loaded_modules->nelts; i++) {
        modi = &modie[i];
        if (modi->name != NULL && strcmp(modi->name, modname) == 0) {
            ap_log_perror(APLOG_MARK, APLOG_WARNING, 0, cmd->pool, APLOGNO(01574)
                          "module %s is already loaded, skipping",
                          modname);
            return NULL;
        }
    }

    for (i = 0; ap_preloaded_modules[i]; i++) {
        const char *preload_name;
        apr_size_t preload_len;
        apr_size_t thismod_len;

        modp = ap_preloaded_modules[i];

        /* make sure we're comparing apples with apples
         * make sure name of preloaded module is mod_FOO.c
         * make sure name of structure being loaded is FOO_module
         */

        if (memcmp(modp->name, "mod_", 4)) {
            continue;
        }

        preload_name = modp->name + strlen("mod_");
        preload_len = strlen(preload_name) - 2;

        if (strlen(modname) <= strlen("_module")) {
            continue;