1 /* Licensed to the Apache Software Foundation (ASF) under one or more
2 * contributor license agreements. See the NOTICE file distributed with
3 * this work for additional information regarding copyright ownership.
4 * The ASF licenses this file to You under the Apache License, Version 2.0
5 * (the "License"); you may not use this file except in compliance with
6 * the License. You may obtain a copy of the License at
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
17 /* The purpose of this file is to store the code that MOST mpm's will need
18 * this does not mean a function only goes into this file if every MPM needs
19 * it. It means that if a function is needed by more than one MPM, and
20 * future maintenance would be served by making the code common, then the
21 * function belongs here.
23 * This is going in src/main because it is not platform specific, it is
24 * specific to multi-process servers, but NOT to Unix. Which is why it
25 * does not belong in src/os/unix
29 #include "apr_thread_proc.h"
30 #include "apr_signal.h"
31 #include "apr_strings.h"
32 #define APR_WANT_STRFUNC
34 #include "apr_getopt.h"
35 #include "apr_optional.h"
36 #include "apr_allocator.h"
39 #include "http_config.h"
40 #include "http_core.h"
42 #include "http_main.h"
43 #include "mpm_common.h"
46 #include "ap_listen.h"
47 #include "util_mutex.h"
49 #include "scoreboard.h"
61 /* we know core's module_index is 0 */
62 #undef APLOG_MODULE_INDEX
63 #define APLOG_MODULE_INDEX AP_CORE_MODULE_INDEX
65 #define DEFAULT_HOOK_LINKS \
66 APR_HOOK_LINK(monitor) \
67 APR_HOOK_LINK(drop_privileges) \
69 APR_HOOK_LINK(mpm_query) \
70 APR_HOOK_LINK(mpm_register_timed_callback) \
71 APR_HOOK_LINK(mpm_get_name) \
72 APR_HOOK_LINK(end_generation) \
73 APR_HOOK_LINK(child_status) \
74 APR_HOOK_LINK(suspend_connection) \
75 APR_HOOK_LINK(resume_connection)
77 #if AP_ENABLE_EXCEPTION_HOOK
79 APR_HOOK_LINK(fatal_exception)
82 AP_IMPLEMENT_HOOK_RUN_ALL(int, fatal_exception,
83 (ap_exception_info_t *ei), (ei), OK, DECLINED)
89 AP_IMPLEMENT_HOOK_RUN_ALL(int, monitor,
90 (apr_pool_t *p, server_rec *s), (p, s), OK, DECLINED)
91 AP_IMPLEMENT_HOOK_RUN_ALL(int, drop_privileges,
92 (apr_pool_t * pchild, server_rec * s),
93 (pchild, s), OK, DECLINED)
94 AP_IMPLEMENT_HOOK_RUN_FIRST(int, mpm,
95 (apr_pool_t *pconf, apr_pool_t *plog, server_rec *s),
96 (pconf, plog, s), DECLINED)
97 AP_IMPLEMENT_HOOK_RUN_FIRST(int, mpm_query,
98 (int query_code, int *result, apr_status_t *_rv),
99 (query_code, result, _rv), DECLINED)
100 AP_IMPLEMENT_HOOK_RUN_FIRST(apr_status_t, mpm_register_timed_callback,
101 (apr_time_t t, ap_mpm_callback_fn_t *cbfn, void *baton),
102 (t, cbfn, baton), APR_ENOTIMPL)
103 AP_IMPLEMENT_HOOK_VOID(end_generation,
104 (server_rec *s, ap_generation_t gen),
106 AP_IMPLEMENT_HOOK_VOID(child_status,
107 (server_rec *s, pid_t pid, ap_generation_t gen, int slot, mpm_child_status status),
108 (s,pid,gen,slot,status))
109 AP_IMPLEMENT_HOOK_VOID(suspend_connection,
110 (conn_rec *c, request_rec *r),
112 AP_IMPLEMENT_HOOK_VOID(resume_connection,
113 (conn_rec *c, request_rec *r),
116 /* hooks with no args are implemented last, after disabling APR hook probes */
117 #if defined(APR_HOOK_PROBES_ENABLED)
118 #undef APR_HOOK_PROBES_ENABLED
119 #undef APR_HOOK_PROBE_ENTRY
120 #define APR_HOOK_PROBE_ENTRY(ud,ns,name,args)
121 #undef APR_HOOK_PROBE_RETURN
122 #define APR_HOOK_PROBE_RETURN(ud,ns,name,rv,args)
123 #undef APR_HOOK_PROBE_INVOKE
124 #define APR_HOOK_PROBE_INVOKE(ud,ns,name,src,args)
125 #undef APR_HOOK_PROBE_COMPLETE
126 #define APR_HOOK_PROBE_COMPLETE(ud,ns,name,src,rv,args)
127 #undef APR_HOOK_INT_DCL_UD
128 #define APR_HOOK_INT_DCL_UD
130 AP_IMPLEMENT_HOOK_RUN_FIRST(const char *, mpm_get_name,
134 typedef struct mpm_gen_info_t {
135 APR_RING_ENTRY(mpm_gen_info_t) link;
136 int gen; /* which gen? */
137 int active; /* number of active processes */
138 int done; /* gen finished? (whether or not active processes) */
141 APR_RING_HEAD(mpm_gen_info_head_t, mpm_gen_info_t);
142 static struct mpm_gen_info_head_t *geninfo, *unused_geninfo;
143 static int gen_head_init; /* yuck */
145 /* variables representing config directives implemented here */
146 AP_DECLARE_DATA const char *ap_pid_fname;
147 AP_DECLARE_DATA int ap_max_requests_per_child;
148 AP_DECLARE_DATA char ap_coredump_dir[MAX_STRING_LEN];
149 AP_DECLARE_DATA int ap_coredumpdir_configured;
150 AP_DECLARE_DATA int ap_graceful_shutdown_timeout;
151 AP_DECLARE_DATA apr_uint32_t ap_max_mem_free;
152 AP_DECLARE_DATA apr_size_t ap_thread_stacksize;
154 #define ALLOCATOR_MAX_FREE_DEFAULT (2048*1024)
156 /* Set defaults for config directives implemented here. This is
157 * called from core's pre-config hook, so MPMs which need to override
158 * one of these should run their pre-config hook after that of core.
160 void mpm_common_pre_config(apr_pool_t *pconf)
162 ap_pid_fname = DEFAULT_PIDLOG;
163 ap_max_requests_per_child = 0; /* unlimited */
164 apr_cpystrn(ap_coredump_dir, ap_server_root, sizeof(ap_coredump_dir));
165 ap_coredumpdir_configured = 0;
166 ap_graceful_shutdown_timeout = 0; /* unlimited */
167 ap_max_mem_free = ALLOCATOR_MAX_FREE_DEFAULT;
168 ap_thread_stacksize = 0; /* use system default */
171 /* number of calls to wait_or_timeout between writable probes */
172 #ifndef INTERVAL_OF_WRITABLE_PROBES
173 #define INTERVAL_OF_WRITABLE_PROBES 10
175 static int wait_or_timeout_counter;
177 AP_DECLARE(void) ap_wait_or_timeout(apr_exit_why_e *status, int *exitcode,
178 apr_proc_t *ret, apr_pool_t *p,
183 ++wait_or_timeout_counter;
184 if (wait_or_timeout_counter == INTERVAL_OF_WRITABLE_PROBES) {
185 wait_or_timeout_counter = 0;
186 ap_run_monitor(p, s);
189 rv = apr_proc_wait_all_procs(ret, exitcode, status, APR_NOWAIT, p);
190 if (APR_STATUS_IS_EINTR(rv)) {
195 if (APR_STATUS_IS_CHILD_DONE(rv)) {
199 apr_sleep(apr_time_from_sec(1));
203 #if defined(TCP_NODELAY)
204 void ap_sock_disable_nagle(apr_socket_t *s)
206 /* The Nagle algorithm says that we should delay sending partial
207 * packets in hopes of getting more data. We don't want to do
208 * this; we are not telnet. There are bad interactions between
209 * persistent connections and Nagle's algorithm that have very severe
210 * performance penalties. (Failing to disable Nagle is not much of a
211 * problem with simple HTTP.)
213 * In spite of these problems, failure here is not a shooting offense.
215 apr_status_t status = apr_socket_opt_set(s, APR_TCP_NODELAY, 1);
217 if (status != APR_SUCCESS) {
218 ap_log_error(APLOG_MARK, APLOG_WARNING, status, ap_server_conf, APLOGNO(00542)
219 "apr_socket_opt_set: (TCP_NODELAY)");
225 AP_DECLARE(uid_t) ap_uname2id(const char *name)
230 return (atoi(&name[1]));
232 if (!(ent = getpwnam(name))) {
233 ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL, APLOGNO(00543)
234 "%s: bad user name %s", ap_server_argv0, name);
238 return (ent->pw_uid);
243 AP_DECLARE(gid_t) ap_gname2id(const char *name)
248 return (atoi(&name[1]));
250 if (!(ent = getgrnam(name))) {
251 ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL, APLOGNO(00544)
252 "%s: bad group name %s", ap_server_argv0, name);
256 return (ent->gr_gid);
260 #ifndef HAVE_INITGROUPS
261 int initgroups(const char *name, gid_t basegid)
263 #if defined(_OSD_POSIX) || defined(OS2) || defined(WIN32) || defined(NETWARE)
266 gid_t groups[NGROUPS_MAX];
272 groups[index++] = basegid;
274 while (index < NGROUPS_MAX && ((g = getgrent()) != NULL)) {
275 if (g->gr_gid != basegid) {
278 for (names = g->gr_mem; *names != NULL; ++names) {
279 if (!strcmp(*names, name))
280 groups[index++] = g->gr_gid;
287 return setgroups(index, groups);
290 #endif /* def HAVE_INITGROUPS */
292 /* standard mpm configuration handling */
294 const char *ap_mpm_set_pidfile(cmd_parms *cmd, void *dummy,
297 const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
302 if (cmd->server->is_virtual) {
303 return "PidFile directive not allowed in <VirtualHost>";
310 void ap_mpm_dump_pidfile(apr_pool_t *p, apr_file_t *out)
312 apr_file_printf(out, "PidFile: \"%s\"\n",
313 ap_server_root_relative(p, ap_pid_fname));
316 const char *ap_mpm_set_max_requests(cmd_parms *cmd, void *dummy,
319 const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
324 if (!strcasecmp(cmd->cmd->name, "MaxRequestsPerChild")) {
325 ap_log_error(APLOG_MARK, APLOG_INFO, 0, NULL, APLOGNO(00545)
326 "MaxRequestsPerChild is deprecated, use "
327 "MaxConnectionsPerChild instead.");
330 ap_max_requests_per_child = atoi(arg);
335 const char *ap_mpm_set_coredumpdir(cmd_parms *cmd, void *dummy,
340 const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
345 fname = ap_server_root_relative(cmd->temp_pool, arg);
347 return apr_pstrcat(cmd->pool, "Invalid CoreDumpDirectory path ",
350 if (apr_stat(&finfo, fname, APR_FINFO_TYPE, cmd->pool) != APR_SUCCESS) {
351 return apr_pstrcat(cmd->pool, "CoreDumpDirectory ", fname,
352 " does not exist", NULL);
354 if (finfo.filetype != APR_DIR) {
355 return apr_pstrcat(cmd->pool, "CoreDumpDirectory ", fname,
356 " is not a directory", NULL);
358 apr_cpystrn(ap_coredump_dir, fname, sizeof(ap_coredump_dir));
359 ap_coredumpdir_configured = 1;
363 AP_DECLARE(const char *)ap_mpm_set_graceful_shutdown(cmd_parms *cmd,
367 const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
371 ap_graceful_shutdown_timeout = atoi(arg);
375 const char *ap_mpm_set_max_mem_free(cmd_parms *cmd, void *dummy,
379 const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
385 value = strtol(arg, NULL, 10);
386 if (value < 0 || errno == ERANGE)
387 return apr_pstrcat(cmd->pool, "Invalid MaxMemFree value: ",
390 ap_max_mem_free = (apr_uint32_t)value * 1024;
395 const char *ap_mpm_set_thread_stacksize(cmd_parms *cmd, void *dummy,
399 const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
405 value = strtol(arg, NULL, 10);
406 if (value < 0 || errno == ERANGE)
407 return apr_pstrcat(cmd->pool, "Invalid ThreadStackSize value: ",
410 ap_thread_stacksize = (apr_size_t)value;
415 AP_DECLARE(apr_status_t) ap_mpm_query(int query_code, int *result)
419 if (ap_run_mpm_query(query_code, result, &rv) == DECLINED) {
426 static void end_gen(mpm_gen_info_t *gi)
428 ap_log_error(APLOG_MARK, APLOG_TRACE4, 0, ap_server_conf,
429 "end of generation %d", gi->gen);
430 ap_run_end_generation(ap_server_conf, gi->gen);
431 APR_RING_REMOVE(gi, link);
432 APR_RING_INSERT_HEAD(unused_geninfo, gi, mpm_gen_info_t, link);
435 apr_status_t ap_mpm_end_gen_helper(void *unused) /* cleanup on pconf */
437 int gen = ap_config_generation - 1; /* differs from MPM generation */
440 if (geninfo == NULL) {
441 /* initial pconf teardown, MPM hasn't run */
445 cur = APR_RING_FIRST(geninfo);
446 while (cur != APR_RING_SENTINEL(geninfo, mpm_gen_info_t, link) &&
448 cur = APR_RING_NEXT(cur, link);
451 if (cur == APR_RING_SENTINEL(geninfo, mpm_gen_info_t, link)) {
452 /* last child of generation already exited */
453 ap_log_error(APLOG_MARK, APLOG_TRACE4, 0, ap_server_conf,
454 "no record of generation %d", gen);
458 if (cur->active == 0) {
466 /* core's child-status hook
467 * tracks number of remaining children per generation and
468 * runs the end-generation hook when the last child of
471 void ap_core_child_status(server_rec *s, pid_t pid,
472 ap_generation_t gen, int slot,
473 mpm_child_status status)
476 const char *status_msg = "unknown status";
478 if (!gen_head_init) { /* where to run this? */
480 geninfo = apr_pcalloc(s->process->pool, sizeof *geninfo);
481 unused_geninfo = apr_pcalloc(s->process->pool, sizeof *unused_geninfo);
482 APR_RING_INIT(geninfo, mpm_gen_info_t, link);
483 APR_RING_INIT(unused_geninfo, mpm_gen_info_t, link);
486 cur = APR_RING_FIRST(geninfo);
487 while (cur != APR_RING_SENTINEL(geninfo, mpm_gen_info_t, link) &&
489 cur = APR_RING_NEXT(cur, link);
493 case MPM_CHILD_STARTED:
494 status_msg = "started";
495 if (cur == APR_RING_SENTINEL(geninfo, mpm_gen_info_t, link)) {
496 /* first child for this generation */
497 if (!APR_RING_EMPTY(unused_geninfo, mpm_gen_info_t, link)) {
498 cur = APR_RING_FIRST(unused_geninfo);
499 APR_RING_REMOVE(cur, link);
500 cur->active = cur->done = 0;
503 cur = apr_pcalloc(s->process->pool, sizeof *cur);
506 APR_RING_ELEM_INIT(cur, link);
507 APR_RING_INSERT_HEAD(geninfo, cur, mpm_gen_info_t, link);
509 ap_random_parent_after_fork();
512 case MPM_CHILD_EXITED:
513 status_msg = "exited";
514 if (cur == APR_RING_SENTINEL(geninfo, mpm_gen_info_t, link)) {
515 ap_log_error(APLOG_MARK, APLOG_ERR, 0, s, APLOGNO(00546)
516 "no record of generation %d of exiting child %" APR_PID_T_FMT,
521 if (!cur->active && cur->done) { /* no children, server has stopped/restarted */
526 case MPM_CHILD_LOST_SLOT:
527 status_msg = "lost slot";
528 /* we don't track by slot, so it doesn't matter */
531 ap_log_error(APLOG_MARK, APLOG_TRACE4, 0, s,
532 "mpm child %" APR_PID_T_FMT " (gen %d/slot %d) %s",
533 pid, gen, slot, status_msg);
536 AP_DECLARE(apr_status_t) ap_mpm_register_timed_callback(apr_time_t t, ap_mpm_callback_fn_t *cbfn, void *baton)
538 return ap_run_mpm_register_timed_callback(t, cbfn, baton);
541 AP_DECLARE(const char *)ap_show_mpm(void)
543 const char *name = ap_run_mpm_get_name();
552 AP_DECLARE(const char *)ap_check_mpm(void)
554 static const char *last_mpm_name = NULL;
556 if (!_hooks.link_mpm || _hooks.link_mpm->nelts == 0)
557 return "No MPM loaded.";
558 else if (_hooks.link_mpm->nelts > 1)
559 return "More than one MPM loaded.";
562 if (strcmp(last_mpm_name, ap_show_mpm())) {
563 return "The MPM cannot be changed during restart.";
567 last_mpm_name = apr_pstrdup(ap_pglobal, ap_show_mpm());