| /* ==================================================================== |
| * The Apache Software License, Version 1.1 |
| * |
| * Copyright (c) 2000-2003 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_portable.h" |
| #include "apr_strings.h" |
| #include "apr_thread_proc.h" |
| #include "apr_signal.h" |
| |
| #define APR_WANT_STDIO |
| #define APR_WANT_STRFUNC |
| #include "apr_want.h" |
| |
| #if APR_HAVE_UNISTD_H |
| #include <unistd.h> |
| #endif |
| #if APR_HAVE_SYS_TYPES_H |
| #include <sys/types.h> |
| #endif |
| |
| #define CORE_PRIVATE |
| |
| #include "ap_config.h" |
| #include "httpd.h" |
| #include "mpm_default.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 "ap_listen.h" |
| #include "ap_mmn.h" |
| #include "apr_poll.h" |
| |
| #ifdef HAVE_BSTRING_H |
| #include <bstring.h> /* for IRIX, FD_SET calls bzero() */ |
| #endif |
| #ifdef HAVE_TIME_H |
| #include <time.h> |
| #endif |
| #ifdef HAVE_SYS_PROCESSOR_H |
| #include <sys/processor.h> /* for bindprocessor() */ |
| #endif |
| |
| #include <signal.h> |
| #include <sys/times.h> |
| |
| /* Limit on the total --- clients will be locked out if more servers than |
| * this are needed. It is intended solely to keep the server from crashing |
| * when things get out of hand. |
| * |
| * We keep a hard maximum number of servers, for two reasons --- first off, |
| * in case something goes seriously wrong, we want to stop the fork bomb |
| * short of actually crashing the machine we're running on by filling some |
| * kernel table. Secondly, it keeps the size of the scoreboard file small |
| * enough that we can read the whole thing without worrying too much about |
| * the overhead. |
| */ |
| #ifndef DEFAULT_SERVER_LIMIT |
| #define DEFAULT_SERVER_LIMIT 256 |
| #endif |
| |
| /* Admin can't tune ServerLimit beyond MAX_SERVER_LIMIT. We want |
| * some sort of compile-time limit to help catch typos. |
| */ |
| #ifndef MAX_SERVER_LIMIT |
| #define MAX_SERVER_LIMIT 20000 |
| #endif |
| |
| #ifndef HARD_THREAD_LIMIT |
| #define HARD_THREAD_LIMIT 1 |
| #endif |
| |
| /* config globals */ |
| |
| int ap_threads_per_child=0; /* Worker threads per child */ |
| static apr_proc_mutex_t *accept_mutex; |
| 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; /* MaxClients */ |
| static int server_limit = DEFAULT_SERVER_LIMIT; |
| static int first_server_limit; |
| static int changed_limit_at_restart; |
| |
| static ap_pod_t *pod; |
| |
| /* |
| * The max child slot ever assigned, preserved across restarts. Necessary |
| * to deal with MaxClients changes across AP_SIG_GRACEFUL 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; |
| |
| /* 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 apr_pool_t *pconf; /* Pool for config stuff */ |
| static apr_pool_t *pchild; /* Pool for httpd child stuff */ |
| |
| static pid_t ap_my_pid; /* it seems silly to call getpid all the time */ |
| static pid_t parent_pid; |
| #ifndef MULTITHREAD |
| static int my_child_num; |
| #endif |
| ap_generation_t volatile ap_my_generation=0; |
| |
| #ifdef TPF |
| int tpf_child = 0; |
| char tpf_server_name[INETD_SERVNAME_LENGTH+1]; |
| #endif /* TPF */ |
| |
| static int die_now = 0; |
| |
| #ifdef GPROF |
| /* |
| * change directory for gprof to plop the gmon.out file |
| * configure in httpd.conf: |
| * GprofDir $RuntimeDir/ -> $ServerRoot/$RuntimeDir/gmon.out |
| * GprofDir $RuntimeDir/% -> $ServerRoot/$RuntimeDir/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; |
| const char *use_dir; |
| |
| if(dir) { |
| apr_status_t res; |
| char buf[512]; |
| int len = strlen(sconf->gprof_dir) - 1; |
| if(*(dir + len) == '%') { |
| dir[len] = '\0'; |
| apr_snprintf(buf, sizeof(buf), "%sgprof.%d", dir, (int)getpid()); |
| } |
| use_dir = ap_server_root_relative(pconf, buf[0] ? buf : dir); |
| res = apr_dir_make(use_dir, 0755, pconf); |
| if(res != APR_SUCCESS && !APR_STATUS_IS_EEXIST(res)) { |
| ap_log_error(APLOG_MARK, APLOG_ERR, errno, ap_server_conf, |
| "gprof: error creating directory %s", dir); |
| } |
| } |
| else { |
| use_dir = ap_server_root_relative(pconf, DEFAULT_REL_RUNTIMEDIR); |
| } |
| |
| chdir(use_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) { |
| apr_pool_destroy(pchild); |
| } |
| ap_mpm_pod_close(pod); |
| chdir_for_gprof(); |
| exit(code); |
| } |
| |
| static void accept_mutex_on(void) |
| { |
| apr_status_t rv = apr_proc_mutex_lock(accept_mutex); |
| if (rv != APR_SUCCESS) { |
| const char *msg = "couldn't grab the accept mutex"; |
| |
| if (ap_my_generation != |
| ap_scoreboard_image->global->running_generation) { |
| ap_log_error(APLOG_MARK, APLOG_DEBUG, rv, NULL, msg); |
| clean_child_exit(0); |
| } |
| else { |
| ap_log_error(APLOG_MARK, APLOG_EMERG, rv, NULL, msg); |
| exit(APEXIT_CHILDFATAL); |
| } |
| } |
| } |
| |
| static void accept_mutex_off(void) |
| { |
| apr_status_t rv = apr_proc_mutex_unlock(accept_mutex); |
| if (rv != APR_SUCCESS) { |
| const char *msg = "couldn't release the accept mutex"; |
| |
| if (ap_my_generation != |
| ap_scoreboard_image->global->running_generation) { |
| ap_log_error(APLOG_MARK, APLOG_DEBUG, rv, NULL, msg); |
| /* don't exit here... we have a connection to |
| * process, after which point we'll see that the |
| * generation changed and we'll exit cleanly |
| */ |
| } |
| else { |
| ap_log_error(APLOG_MARK, APLOG_EMERG, rv, NULL, msg); |
| exit(APEXIT_CHILDFATAL); |
| } |
| } |
| } |
| |
| /* 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 |
| |
| AP_DECLARE(apr_status_t) ap_mpm_query(int query_code, int *result) |
| { |
| switch(query_code){ |
| case AP_MPMQ_MAX_DAEMON_USED: |
| *result = ap_daemons_limit; |
| return APR_SUCCESS; |
| case AP_MPMQ_IS_THREADED: |
| *result = AP_MPMQ_NOT_SUPPORTED; |
| return APR_SUCCESS; |
| case AP_MPMQ_IS_FORKED: |
| *result = AP_MPMQ_DYNAMIC; |
| return APR_SUCCESS; |
| case AP_MPMQ_HARD_LIMIT_DAEMONS: |
| *result = server_limit; |
| return APR_SUCCESS; |
| case AP_MPMQ_HARD_LIMIT_THREADS: |
| *result = HARD_THREAD_LIMIT; |
| return APR_SUCCESS; |
| case AP_MPMQ_MAX_THREADS: |
| *result = 0; |
| return APR_SUCCESS; |
| case AP_MPMQ_MIN_SPARE_DAEMONS: |
| *result = ap_daemons_min_free; |
| return APR_SUCCESS; |
| case AP_MPMQ_MIN_SPARE_THREADS: |
| *result = 0; |
| return APR_SUCCESS; |
| case AP_MPMQ_MAX_SPARE_DAEMONS: |
| *result = ap_daemons_max_free; |
| return APR_SUCCESS; |
| case AP_MPMQ_MAX_SPARE_THREADS: |
| *result = 0; |
| return APR_SUCCESS; |
| case AP_MPMQ_MAX_REQUESTS_DAEMON: |
| *result = ap_max_requests_per_child; |
| return APR_SUCCESS; |
| case AP_MPMQ_MAX_DAEMONS: |
| *result = server_limit; |
| return APR_SUCCESS; |
| } |
| return APR_ENOTIMPL; |
| } |
| |
| #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(int *exitcode, apr_exit_why_e *status) |
| { |
| int n, pid; |
| |
| for (n = 0; n < ap_max_daemons_limit; ++n) { |
| if (ap_scoreboard_image->servers[n][0].status != SERVER_DEAD && |
| kill((pid = ap_scoreboard_image->parent[n].pid), 0) == -1) { |
| ap_update_child_status_from_indexes(n, 0, SERVER_DEAD, NULL); |
| /* just mark it as having a successful exit status */ |
| *status = APR_PROC_EXIT; |
| *exitcode = 0; |
| return(pid); |
| } |
| } |
| return 0; |
| } |
| #endif |
| |
| /* handle all varieties of core dumping signals */ |
| static void sig_coredump(int sig) |
| { |
| chdir(ap_coredump_dir); |
| apr_signal(sig, SIG_DFL); |
| if (ap_my_pid == parent_pid) { |
| ap_log_error(APLOG_MARK, APLOG_NOTICE, |
| 0, ap_server_conf, |
| "seg fault or similar nasty error detected " |
| "in the parent process"); |
| } |
| 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); |
| } |
| |
| /* volatile just in case */ |
| static int volatile shutdown_pending; |
| static int volatile restart_pending; |
| static int volatile is_graceful; |
| |
| 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; |
| } |
| |
| /* restart() is the signal handler for SIGHUP and AP_SIG_GRACEFUL |
| * in the parent process, unless running in ONE_PROCESS mode |
| */ |
| static void restart(int sig) |
| { |
| if (restart_pending == 1) { |
| /* Probably not an error - don't bother reporting it */ |
| return; |
| } |
| restart_pending = 1; |
| is_graceful = (sig == AP_SIG_GRACEFUL); |
| } |
| |
| 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 AP_SIG_GRACEFUL while we're busy |
| * processing one */ |
| sigaddset(&sa.sa_mask, SIGHUP); |
| sigaddset(&sa.sa_mask, AP_SIG_GRACEFUL); |
| 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(AP_SIG_GRACEFUL, &sa, NULL) < 0) |
| ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, "sigaction(" AP_SIG_GRACEFUL_STRING ")"); |
| #else |
| if (!one_process) { |
| apr_signal(SIGSEGV, sig_coredump); |
| #ifdef SIGBUS |
| apr_signal(SIGBUS, sig_coredump); |
| #endif /* SIGBUS */ |
| #ifdef SIGABORT |
| apr_signal(SIGABORT, sig_coredump); |
| #endif /* SIGABORT */ |
| #ifdef SIGABRT |
| apr_signal(SIGABRT, sig_coredump); |
| #endif /* SIGABRT */ |
| #ifdef SIGILL |
| apr_signal(SIGILL, sig_coredump); |
| #endif /* SIGILL */ |
| #ifdef SIGXCPU |
| apr_signal(SIGXCPU, SIG_DFL); |
| #endif /* SIGXCPU */ |
| #ifdef SIGXFSZ |
| apr_signal(SIGXFSZ, SIG_DFL); |
| #endif /* SIGXFSZ */ |
| } |
| |
| apr_signal(SIGTERM, sig_term); |
| #ifdef SIGHUP |
| apr_signal(SIGHUP, restart); |
| #endif /* SIGHUP */ |
| #ifdef AP_SIG_GRACEFUL |
| apr_signal(AP_SIG_GRACEFUL, restart); |
| #endif /* AP_SIG_GRACEFUL */ |
| #ifdef SIGPIPE |
| apr_signal(SIGPIPE, SIG_IGN); |
| #endif /* SIGPIPE */ |
| |
| #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 requests_this_child; |
| static int num_listensocks = 0; |
| static ap_listen_rec *listensocks; |
| |
| int ap_graceful_stop_signalled(void) |
| { |
| /* not ever called anymore... */ |
| return 0; |
| } |
| |
| |
| static void child_main(int child_num_arg) |
| { |
| apr_pool_t *ptrans; |
| apr_allocator_t *allocator; |
| conn_rec *current_conn; |
| apr_status_t status = APR_EINIT; |
| int i; |
| ap_listen_rec *lr; |
| int curr_pollfd, last_pollfd = 0; |
| apr_pollfd_t *pollset; |
| int offset; |
| void *csd; |
| ap_sb_handle_t *sbh; |
| apr_status_t rv; |
| apr_bucket_alloc_t *bucket_alloc; |
| |
| my_child_num = child_num_arg; |
| ap_my_pid = getpid(); |
| csd = NULL; |
| requests_this_child = 0; |
| |
| /* Get a sub context for global allocations in this child, so that |
| * we can have cleanups occur when the child exits. |
| */ |
| apr_allocator_create(&allocator); |
| apr_allocator_max_free_set(allocator, ap_max_mem_free); |
| apr_pool_create_ex(&pchild, pconf, NULL, allocator); |
| apr_allocator_owner_set(allocator, pchild); |
| |
| apr_pool_create(&ptrans, pchild); |
| apr_pool_tag(ptrans, "transaction"); |
| |
| /* needs to be done before we switch UIDs so we have permissions */ |
| ap_reopen_scoreboard(pchild, NULL, 0); |
| rv = apr_proc_mutex_child_init(&accept_mutex, ap_lock_fname, pchild); |
| if (rv != APR_SUCCESS) { |
| ap_log_error(APLOG_MARK, APLOG_EMERG, rv, ap_server_conf, |
| "Couldn't initialize cross-process lock in child"); |
| clean_child_exit(APEXIT_CHILDFATAL); |
| } |
| |
| if (unixd_setup_child()) { |
| clean_child_exit(APEXIT_CHILDFATAL); |
| } |
| |
| ap_run_child_init(pchild, ap_server_conf); |
| |
| ap_create_sb_handle(&sbh, pchild, my_child_num, 0); |
| |
| (void) ap_update_child_status(sbh, SERVER_READY, (request_rec *) NULL); |
| |
| /* Set up the pollfd array */ |
| listensocks = apr_pcalloc(pchild, |
| sizeof(*listensocks) * (num_listensocks)); |
| for (lr = ap_listeners, i = 0; i < num_listensocks; lr = lr->next, i++) { |
| listensocks[i].accept_func = lr->accept_func; |
| listensocks[i].sd = lr->sd; |
| } |
| |
| pollset = apr_palloc(pchild, sizeof(*pollset) * num_listensocks); |
| pollset[0].p = pchild; |
| for (i = 0; i < num_listensocks; i++) { |
| pollset[i].desc.s = listensocks[i].sd; |
| pollset[i].desc_type = APR_POLL_SOCKET; |
| pollset[i].reqevents = APR_POLLIN; |
| } |
| |
| bucket_alloc = apr_bucket_alloc_create(pchild); |
| |
| while (!die_now) { |
| /* |
| * (Re)initialize this child to a pre-connection state. |
| */ |
| |
| current_conn = NULL; |
| |
| apr_pool_clear(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(sbh, SERVER_READY, (request_rec *) NULL); |
| |
| /* |
| * Wait for an acceptable connection to arrive. |
| */ |
| |
| /* Lock around "accept", if necessary */ |
| SAFE_ACCEPT(accept_mutex_on()); |
| |
| if (num_listensocks == 1) { |
| offset = 0; |
| } |
| else { |
| /* multiple listening sockets - need to poll */ |
| for (;;) { |
| apr_status_t ret; |
| apr_int32_t n; |
| |
| ret = apr_poll(pollset, num_listensocks, &n, -1); |
| if (ret != APR_SUCCESS) { |
| if (APR_STATUS_IS_EINTR(ret)) { |
| continue; |
| } |
| /* 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, ret, ap_server_conf, |
| "apr_poll: (listen)"); |
| clean_child_exit(1); |
| } |
| /* find a listener */ |
| curr_pollfd = last_pollfd; |
| do { |
| curr_pollfd++; |
| if (curr_pollfd >= num_listensocks) { |
| curr_pollfd = 0; |
| } |
| /* XXX: Should we check for POLLERR? */ |
| if (pollset[curr_pollfd].rtnevents & APR_POLLIN) { |
| last_pollfd = curr_pollfd; |
| offset = curr_pollfd; |
| goto got_fd; |
| } |
| } while (curr_pollfd != last_pollfd); |
| |
| continue; |
| } |
| } |
| got_fd: |
| /* if we accept() something we don't want to die, so we have to |
| * defer the exit |
| */ |
| status = listensocks[offset].accept_func(&csd, |
| &listensocks[offset], ptrans); |
| SAFE_ACCEPT(accept_mutex_off()); /* unlock after "accept" */ |
| |
| if (status == APR_EGENERAL) { |
| /* resource shortage or should-not-occur occured */ |
| clean_child_exit(1); |
| } |
| else if (status != APR_SUCCESS) { |
| continue; |
| } |
| |
| /* |
| * We now have a connection, so set it up with the appropriate |
| * socket options, file descriptors, and read/write buffers. |
| */ |
| |
| current_conn = ap_run_create_connection(ptrans, ap_server_conf, csd, my_child_num, sbh, bucket_alloc); |
| if (current_conn) { |
| ap_process_connection(current_conn, csd); |
| ap_lingering_close(current_conn); |
| } |
| |
| /* Check the pod and the generation number after processing a |
| * connection so that we'll go away if a graceful restart occurred |
| * while we were processing the connection or we are the lucky |
| * idle server process that gets to die. |
| */ |
| if (ap_mpm_pod_check(pod) == APR_SUCCESS) { /* selected as idle? */ |
| die_now = 1; |
| } |
| else if (ap_my_generation != |
| ap_scoreboard_image->global->running_generation) { /* restart? */ |
| /* yeah, this could be non-graceful restart, in which case the |
| * parent will kill us soon enough, but why bother checking? |
| */ |
| die_now = 1; |
| } |
| } |
| clean_child_exit(0); |
| } |
| |
| |
| static int make_child(server_rec *s, int slot) |
| { |
| int pid; |
| |
| if (slot + 1 > ap_max_daemons_limit) { |
| ap_max_daemons_limit = slot + 1; |
| } |
| |
| if (one_process) { |
| apr_signal(SIGHUP, just_die); |
| /* Don't catch AP_SIG_GRACEFUL in ONE_PROCESS mode :) */ |
| apr_signal(SIGINT, just_die); |
| #ifdef SIGQUIT |
| apr_signal(SIGQUIT, SIG_DFL); |
| #endif |
| apr_signal(SIGTERM, just_die); |
| child_main(slot); |
| } |
| |
| (void) ap_update_child_status_from_indexes(slot, 0, 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_from_indexes(slot, 0, 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 HAVE_BINDPROCESSOR |
| /* by default AIX binds to a single processor |
| * this bit unbinds children which will then bind to another cpu |
| */ |
| int status = bindprocessor(BINDPROCESS, (int)getpid(), |
| PROCESSOR_CLASS_ANY); |
| if (status != OK) { |
| ap_log_error(APLOG_MARK, APLOG_WARNING, errno, |
| ap_server_conf, "processor unbind failed %d", status); |
| } |
| #endif |
| RAISE_SIGSTOP(MAKE_CHILD); |
| AP_MONCONTROL(1); |
| /* Disable the parent's signal handlers and set up proper handling in |
| * the child. |
| */ |
| apr_signal(SIGHUP, just_die); |
| apr_signal(SIGTERM, just_die); |
| /* The child process doesn't do anything for AP_SIG_GRACEFUL. |
| * Instead, the pod is used for signalling graceful restart. |
| */ |
| apr_signal(AP_SIG_GRACEFUL, SIG_IGN); |
| child_main(slot); |
| } |
| |
| ap_scoreboard_image->parent[slot].pid = pid; |
| |
| return 0; |
| } |
| |
| |
| /* start up a bunch of children */ |
| static void startup_children(int number_to_start) |
| { |
| int i; |
| |
| for (i = 0; number_to_start && i < ap_daemons_limit; ++i) { |
| if (ap_scoreboard_image->servers[i][0].status != SERVER_DEAD) { |
| continue; |
| } |
| if (make_child(ap_server_conf, i) < 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(apr_pool_t *p) |
| { |
| int i; |
| int to_kill; |
| int idle_count; |
| worker_score *ws; |
| 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; |
| |
| for (i = 0; i < ap_daemons_limit; ++i) { |
| int status; |
| |
| if (i >= ap_max_daemons_limit && free_length == idle_spawn_rate) |
| break; |
| ws = &ap_scoreboard_image->servers[i][0]; |
| status = ws->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 the pod because that'll cause it to |
| * shut down gracefully, in case it happened to pick up a request |
| * while we were counting |
| */ |
| ap_mpm_pod_signal(pod); |
| 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_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_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]) == -1) { |
| if(free_length == 1) { |
| shutdown_pending = 1; |
| ap_log_error(APLOG_MARK, APLOG_EMERG, 0, ap_server_conf, |
| "No active child processes: shutting down"); |
| } |
| } |
| #else |
| make_child(ap_server_conf, free_slots[i]); |
| #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; |
| } |
| } |
| |
| /***************************************************************** |
| * Executive routines. |
| */ |
| |
| int ap_mpm_run(apr_pool_t *_pconf, apr_pool_t *plog, server_rec *s) |
| { |
| int index; |
| int remaining_children_to_start; |
| apr_status_t rv; |
| |
| ap_log_pid(pconf, ap_pid_fname); |
| |
| first_server_limit = server_limit; |
| if (changed_limit_at_restart) { |
| ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s, |
| "WARNING: Attempt to change ServerLimit " |
| "ignored during restart"); |
| changed_limit_at_restart = 0; |
| } |
| |
| /* Initialize cross-process accept lock */ |
| ap_lock_fname = apr_psprintf(_pconf, "%s.%" APR_PID_T_FMT, |
| ap_server_root_relative(_pconf, ap_lock_fname), |
| ap_my_pid); |
| |
| rv = apr_proc_mutex_create(&accept_mutex, ap_lock_fname, |
| ap_accept_lock_mech, _pconf); |
| if (rv != APR_SUCCESS) { |
| ap_log_error(APLOG_MARK, APLOG_EMERG, rv, s, |
| "Couldn't create accept lock"); |
| return 1; |
| } |
| |
| #if APR_USE_SYSVSEM_SERIALIZE |
| if (ap_accept_lock_mech == APR_LOCK_DEFAULT || |
| ap_accept_lock_mech == APR_LOCK_SYSVSEM) { |
| #else |
| if (ap_accept_lock_mech == APR_LOCK_SYSVSEM) { |
| #endif |
| rv = unixd_set_proc_mutex_perms(accept_mutex); |
| if (rv != APR_SUCCESS) { |
| ap_log_error(APLOG_MARK, APLOG_EMERG, rv, s, |
| "Couldn't set permissions on cross-process lock; " |
| "check User and Group directives"); |
| return 1; |
| } |
| } |
| |
| if (!is_graceful) { |
| if (ap_run_pre_mpm(s->process->pool, SB_SHARED) != OK) { |
| return 1; |
| } |
| /* fix the generation number in the global score; we just got a new, |
| * cleared scoreboard |
| */ |
| ap_scoreboard_image->global->running_generation = ap_my_generation; |
| } |
| |
| set_signals(); |
| |
| if (one_process) { |
| AP_MONCONTROL(1); |
| } |
| |
| 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 AP_SIG_GRACEFUL). 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_NOTICE, 0, ap_server_conf, |
| "%s configured -- resuming normal operations", |
| ap_get_server_version()); |
| ap_log_error(APLOG_MARK, APLOG_INFO, 0, ap_server_conf, |
| "Server built: %s", ap_get_server_built()); |
| #ifdef AP_MPM_WANT_SET_ACCEPT_LOCK_MECH |
| ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, ap_server_conf, |
| "AcceptMutex: %s (default: %s)", |
| apr_proc_mutex_name(accept_mutex), |
| apr_proc_mutex_defname()); |
| #endif |
| restart_pending = shutdown_pending = 0; |
| |
| while (!restart_pending && !shutdown_pending) { |
| int child_slot; |
| apr_exit_why_e exitwhy; |
| int status, processed_status; |
| /* this is a memory leak, but I'll fix it later. */ |
| apr_proc_t pid; |
| |
| ap_wait_or_timeout(&exitwhy, &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) { |
| processed_status = ap_process_child_status(&pid, exitwhy, status); |
| if (processed_status == APEXIT_CHILDFATAL) { |
| return 1; |
| } |
| |
| /* non-fatal death... note that it's gone in the scoreboard. */ |
| child_slot = find_child_by_pid(&pid); |
| if (child_slot >= 0) { |
| (void) ap_update_child_status_from_indexes(child_slot, 0, SERVER_DEAD, |
| (request_rec *) NULL); |
| if (processed_status == APEXIT_CHILDSICK) { |
| /* child detected a resource shortage (E[NM]FILE, ENOBUFS, etc) |
| * cut the fork rate to the minimum |
| */ |
| idle_spawn_rate = 1; |
| } |
| else 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); |
| --remaining_children_to_start; |
| } |
| #if APR_HAS_OTHER_CHILD |
| } |
| else if (apr_proc_other_child_read(&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_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(pconf); |
| #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_INFO, |
| 0, ap_server_conf, |
| "removed PID file %s (pid=%ld)", |
| pidfile, (long)getpid()); |
| } |
| |
| ap_log_error(APLOG_MARK, APLOG_NOTICE, 0, ap_server_conf, |
| "caught SIGTERM, shutting down"); |
| return 1; |
| } |
| |
| /* we've been told to restart */ |
| apr_signal(SIGHUP, 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; |
| |
| if (is_graceful) { |
| ap_log_error(APLOG_MARK, APLOG_NOTICE, 0, ap_server_conf, |
| "Graceful restart requested, doing restart"); |
| |
| /* kill off the idle ones */ |
| ap_mpm_pod_killpg(pod, ap_daemons_limit); |
| |
| /* This is mostly for debugging... so that we know what is still |
| * gracefully dealing with existing request. This will break |
| * in a very nasty way if we ever have the scoreboard totally |
| * file-based (no shared memory) |
| */ |
| for (index = 0; index < ap_daemons_limit; ++index) { |
| if (ap_scoreboard_image->servers[index][0].status != SERVER_DEAD) { |
| ap_scoreboard_image->servers[index][0].status = SERVER_GRACEFUL; |
| } |
| } |
| } |
| 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_NOTICE, 0, ap_server_conf, |
| "SIGHUP received. Attempting to restart"); |
| } |
| |
| return 0; |
| } |
| |
| /* This really should be a post_config hook, but the error log is already |
| * redirected by that point, so we need to do this in the open_logs phase. |
| */ |
| static int prefork_open_logs(apr_pool_t *p, apr_pool_t *plog, apr_pool_t *ptemp, server_rec *s) |
| { |
| apr_status_t rv; |
| |
| pconf = p; |
| ap_server_conf = s; |
| |
| if ((num_listensocks = ap_setup_listeners(ap_server_conf)) < 1) { |
| ap_log_error(APLOG_MARK, APLOG_ALERT|APLOG_STARTUP, 0, |
| NULL, "no listening sockets available, shutting down"); |
| return DONE; |
| } |
| |
| if ((rv = ap_mpm_pod_open(pconf, &pod))) { |
| ap_log_error(APLOG_MARK, APLOG_CRIT|APLOG_STARTUP, rv, NULL, |
| "Could not open pipe-of-death."); |
| return DONE; |
| } |
| return OK; |
| } |
| |
| static int prefork_pre_config(apr_pool_t *p, apr_pool_t *plog, apr_pool_t *ptemp) |
| { |
| static int restart_num = 0; |
| int no_detach, debug, foreground; |
| apr_status_t rv; |
| |
| debug = ap_exists_config_define("DEBUG"); |
| |
| if (debug) { |
| foreground = one_process = 1; |
| no_detach = 0; |
| } |
| else |
| { |
| no_detach = ap_exists_config_define("NO_DETACH"); |
| one_process = ap_exists_config_define("ONE_PROCESS"); |
| foreground = ap_exists_config_define("FOREGROUND"); |
| } |
| |
| /* sigh, want this only the second time around */ |
| if (restart_num++ == 1) { |
| is_graceful = 0; |
| |
| if (!one_process && !foreground) { |
| rv = apr_proc_detach(no_detach ? APR_PROC_DETACH_FOREGROUND |
| : APR_PROC_DETACH_DAEMONIZE); |
| if (rv != APR_SUCCESS) { |
| ap_log_error(APLOG_MARK, APLOG_CRIT, rv, NULL, |
| "apr_proc_detach failed"); |
| return HTTP_INTERNAL_SERVER_ERROR; |
| } |
| } |
| |
| parent_pid = ap_my_pid = getpid(); |
| } |
| |
| unixd_pre_config(ptemp); |
| 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 = server_limit; |
| ap_pid_fname = DEFAULT_PIDLOG; |
| ap_lock_fname = DEFAULT_LOCKFILE; |
| ap_max_requests_per_child = DEFAULT_MAX_REQUESTS_PER_CHILD; |
| ap_extended_status = 0; |
| |
| apr_cpystrn(ap_coredump_dir, ap_server_root, sizeof(ap_coredump_dir)); |
| |
| return OK; |
| } |
| |
| static void prefork_hooks(apr_pool_t *p) |
| { |
| /* The prefork open_logs phase must run before the core's, or stderr |
| * will be redirected to a file, and the messages won't print to the |
| * console. |
| */ |
| static const char *const aszSucc[] = {"core.c", NULL}; |
| |
| #ifdef AUX3 |
| (void) set42sig(); |
| #endif |
| |
| ap_hook_open_logs(prefork_open_logs, NULL, aszSucc, APR_HOOK_MIDDLE); |
| ap_hook_pre_config(prefork_pre_config, NULL, NULL, APR_HOOK_MIDDLE); |
| } |
| |
| 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, 0, NULL, |
| "WARNING: detected MinSpareServers set to non-positive."); |
| ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL, |
| "Resetting to 1 to avoid almost certain Apache failure."); |
| ap_log_error(APLOG_MARK, APLOG_STARTUP, 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_max_clients (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 > server_limit) { |
| ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL, |
| "WARNING: MaxClients of %d exceeds ServerLimit value " |
| "of %d servers,", ap_daemons_limit, server_limit); |
| ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL, |
| " lowering MaxClients to %d. To increase, please " |
| "see the ServerLimit", server_limit); |
| ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL, |
| " directive."); |
| ap_daemons_limit = server_limit; |
| } |
| else if (ap_daemons_limit < 1) { |
| ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL, |
| "WARNING: Require MaxClients > 0, setting to 1"); |
| ap_daemons_limit = 1; |
| } |
| return NULL; |
| } |
| |
| static const char *set_server_limit (cmd_parms *cmd, void *dummy, const char *arg) |
| { |
| int tmp_server_limit; |
| |
| const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY); |
| if (err != NULL) { |
| return err; |
| } |
| |
| tmp_server_limit = atoi(arg); |
| /* you cannot change ServerLimit across a restart; ignore |
| * any such attempts |
| */ |
| if (first_server_limit && |
| tmp_server_limit != server_limit) { |
| /* how do we log a message? the error log is a bit bucket at this |
| * point; we'll just have to set a flag so that ap_mpm_run() |
| * logs a warning later |
| */ |
| changed_limit_at_restart = 1; |
| return NULL; |
| } |
| server_limit = tmp_server_limit; |
| |
| if (server_limit > MAX_SERVER_LIMIT) { |
| ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL, |
| "WARNING: ServerLimit of %d exceeds compile time limit " |
| "of %d servers,", server_limit, MAX_SERVER_LIMIT); |
| ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL, |
| " lowering ServerLimit to %d.", MAX_SERVER_LIMIT); |
| server_limit = MAX_SERVER_LIMIT; |
| } |
| else if (server_limit < 1) { |
| ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL, |
| "WARNING: Require ServerLimit > 0, setting to 1"); |
| server_limit = 1; |
| } |
| return NULL; |
| } |
| |
| static const command_rec prefork_cmds[] = { |
| UNIX_DAEMON_COMMANDS, |
| LISTEN_COMMANDS, |
| 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_max_clients, NULL, RSRC_CONF, |
| "Maximum number of children alive at the same time"), |
| AP_INIT_TAKE1("ServerLimit", set_server_limit, NULL, RSRC_CONF, |
| "Maximum value of MaxClients for this run of Apache"), |
| { NULL } |
| }; |
| |
| module AP_MODULE_DECLARE_DATA mpm_prefork_module = { |
| MPM20_MODULE_STUFF, |
| ap_mpm_rewrite_args, /* 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 apr_table_t */ |
| prefork_hooks, /* register hooks */ |
| }; |