simple_api.c revision aae6ae5e5557b23552f5771aa385c5b6bb203229
/* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "ap_mpm.h"
#include "httpd.h"
#include "http_config.h"
#include "mpm_common.h"
#include "http_log.h"
#include "scoreboard.h"
#include "ap_listen.h"
#include "simple_types.h"
#include "simple_run.h"
#include "http_core.h"
/* This file contains the absolute minimal MPM API, to interface with httpd. */
static int simple_run(apr_pool_t * pconf, apr_pool_t * plog, server_rec * s)
{
simple_core_t *sc = simple_core_get();
sc->mpm_state = AP_MPMQ_RUNNING;
if (ap_run_pre_mpm(s->process->pool, SB_SHARED) != OK) {
sc->mpm_state = AP_MPMQ_STOPPING;
return 1;
}
return simple_main_loop(sc);
}
static apr_status_t simple_query(int query_code, int *result)
{
simple_core_t *sc = simple_core_get();
switch (query_code) {
case AP_MPMQ_IS_THREADED:
*result = AP_MPMQ_STATIC;
return APR_SUCCESS;
break;
case AP_MPMQ_IS_FORKED:
*result = AP_MPMQ_DYNAMIC;
return APR_SUCCESS;
break;
case AP_MPMQ_IS_ASYNC:
*result = 1;
return APR_SUCCESS;
break;
case AP_MPMQ_MAX_DAEMON_USED:
*result = sc->procmgr.proc_count;
return APR_SUCCESS;
break;
case AP_MPMQ_HARD_LIMIT_DAEMONS:
*result = sc->procmgr.proc_count;
return APR_SUCCESS;
break;
case AP_MPMQ_HARD_LIMIT_THREADS:
*result = sc->procmgr.thread_count;
return APR_SUCCESS;
break;
case AP_MPMQ_MAX_THREADS:
*result = sc->procmgr.thread_count;
return APR_SUCCESS;
break;
case AP_MPMQ_MAX_SPARE_DAEMONS:
*result = sc->procmgr.proc_count;
return APR_SUCCESS;
break;
case AP_MPMQ_MIN_SPARE_DAEMONS:
*result = sc->procmgr.proc_count;
return APR_SUCCESS;
break;
case AP_MPMQ_MIN_SPARE_THREADS:
case AP_MPMQ_MAX_SPARE_THREADS:
*result = sc->procmgr.thread_count;
return APR_SUCCESS;
break;
case AP_MPMQ_MAX_REQUESTS_DAEMON:
*result = sc->procmgr.max_requests_per_child;
return APR_SUCCESS;
break;
case AP_MPMQ_MAX_DAEMONS:
*result = sc->procmgr.proc_count;
return APR_SUCCESS;
break;
case AP_MPMQ_MPM_STATE:
*result = sc->mpm_state;
return APR_SUCCESS;
case AP_MPMQ_GENERATION:
*result = 0;
return APR_SUCCESS;
default:
break;
}
return APR_ENOTIMPL;
}
static const char *
simple_get_name(void)
{
return "simple";
}
static int
simple_open_logs(apr_pool_t * p,
apr_pool_t * plog, apr_pool_t * ptemp, server_rec * s)
{
int nsock;
nsock = ap_setup_listeners(s);
if (nsock < 1) {
ap_log_error(APLOG_MARK, APLOG_ALERT, 0,
s,
"simple_open_logs: no listening sockets available, shutting down");
return DONE;
}
return OK;
}
static int
simple_pre_config(apr_pool_t * pconf, apr_pool_t * plog, apr_pool_t * ptemp)
{
int run_debug;
apr_status_t rv;
simple_core_t *sc;
/* this is our first 'real' entry point, so setup everything here. */
rv = simple_core_init_once();
if (rv) {
ap_log_error(APLOG_MARK, APLOG_CRIT, rv, NULL,
"simple_core_init_once: Fatal Error Encountered");
return HTTP_INTERNAL_SERVER_ERROR;
}
sc = simple_core_get();
sc->restart_num++;
run_debug = ap_exists_config_define("DEBUG");
if (run_debug) {
sc->run_foreground = 1;
sc->run_single_process = 1;
}
else {
sc->run_foreground = ap_exists_config_define("FOREGROUND");
}
if (sc->restart_num == 2) {
if (sc->run_foreground) {
rv = apr_proc_detach(APR_PROC_DETACH_FOREGROUND);
}
else {
rv = apr_proc_detach(APR_PROC_DETACH_DAEMONIZE);
}
if (rv) {
ap_log_error(APLOG_MARK, APLOG_CRIT, rv, NULL,
"simple_pre_config: apr_proc_detach(%s) failed",
sc->run_foreground ? "FOREGROUND" : "DAEMONIZE");
return HTTP_INTERNAL_SERVER_ERROR;
}
}
return OK;
}
static int
simple_check_config(apr_pool_t * p, apr_pool_t * plog,
apr_pool_t * ptemp, server_rec * s)
{
simple_core_t *sc = simple_core_get();
if (sc->procmgr.proc_count > SIMPLE_MAX_PROC) {
ap_log_error(APLOG_MARK, APLOG_CRIT, 0, s,
"simple_check_config: SimpleProcCount must be at most %d",
SIMPLE_MAX_PROC);
return !OK;
}
if (sc->procmgr.proc_count < SIMPLE_MIN_PROC) {
ap_log_error(APLOG_MARK, APLOG_CRIT, 0, s,
"simple_check_config: SimpleProcCount must be at least %d",
SIMPLE_MIN_PROC);
return !OK;
}
if (sc->procmgr.thread_count > SIMPLE_MAX_THREADS) {
ap_log_error(APLOG_MARK, APLOG_CRIT, 0, s,
"simple_check_config: SimpleThreadCount must be at most %d",
SIMPLE_MAX_THREADS);
return !OK;
}
if (sc->procmgr.thread_count < SIMPLE_MIN_THREADS) {
ap_log_error(APLOG_MARK, APLOG_CRIT, 0, s,
"simple_check_config: SimpleThreadCount must be at least %d",
SIMPLE_MIN_THREADS);
return !OK;
}
return OK;
}
static void simple_hooks(apr_pool_t * p)
{
static const char *const aszSucc[] = { "core.c", NULL };
ap_hook_open_logs(simple_open_logs, NULL, aszSucc, APR_HOOK_REALLY_FIRST);
ap_hook_pre_config(simple_pre_config, NULL, NULL, APR_HOOK_REALLY_FIRST);
ap_hook_check_config(simple_check_config, NULL, NULL, APR_HOOK_MIDDLE);
ap_hook_mpm(simple_run, NULL, NULL, APR_HOOK_MIDDLE);
ap_hook_mpm_query(simple_query, NULL, NULL, APR_HOOK_MIDDLE);
ap_hook_mpm_get_name(simple_get_name, NULL, NULL, APR_HOOK_MIDDLE);
}
static const char *set_proccount(cmd_parms * cmd, void *baton,
const char *arg)
{
const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
if (err != NULL) {
return err;
}
simple_core_get()->procmgr.proc_count = atoi(arg);
return NULL;
}
static const char *set_threadcount(cmd_parms * cmd, void *baton,
const char *arg)
{
simple_core_t *sc = simple_core_get();
const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
if (err != NULL) {
return err;
}
sc->procmgr.thread_count = atoi(arg);
return NULL;
}
static const command_rec simple_cmds[] = {
AP_INIT_TAKE1("SimpleProcCount", set_proccount, NULL, RSRC_CONF,
"Number of child processes launched at server startup"),
AP_INIT_TAKE1("SimpleThreadCount", set_threadcount, NULL, RSRC_CONF,
"Set the number of Worker Threads Per-Process"),
/* pqXXXXXXXXX: These do NOT belong in the MPM configuration commands. */
LISTEN_COMMANDS,
{NULL}
};
module AP_MODULE_DECLARE_DATA mpm_simple_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 */
simple_cmds, /* command apr_table_t */
simple_hooks /* register_hooks */
};