| /* ==================================================================== |
| * The Apache Software License, Version 1.1 |
| * |
| * Copyright (c) 2000-2002 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_hash.h" |
| #include "apr_strings.h" |
| #include "apr_pools.h" |
| #include "apr_portable.h" |
| #include "apr_file_io.h" |
| #include "apr_signal.h" |
| |
| #define APR_WANT_IOVEC |
| #include "apr_want.h" |
| |
| #if APR_HAVE_UNISTD_H |
| #include <unistd.h> |
| #endif |
| #if APR_HAVE_SYS_SOCKET_H |
| #include <sys/socket.h> |
| #endif |
| |
| #if !APR_HAS_THREADS |
| #error The perchild MPM requires APR threads, but they are unavailable. |
| #endif |
| |
| #define CORE_PRIVATE |
| |
| #include "ap_config.h" |
| #include "httpd.h" |
| #include "http_main.h" |
| #include "http_log.h" |
| #include "http_config.h" /* for read_config */ |
| #include "http_core.h" /* for get_remote_host */ |
| #include "http_protocol.h" |
| #include "http_connection.h" |
| #include "ap_mpm.h" |
| #include "unixd.h" |
| #include "mpm_common.h" |
| #include "ap_listen.h" |
| #include "mpm_default.h" |
| #include "mpm.h" |
| #include "scoreboard.h" |
| #include "util_filter.h" |
| |
| /* ### should be APR-ized */ |
| #include <poll.h> |
| #include <grp.h> |
| #include <pwd.h> |
| #include <sys/stat.h> |
| #include <sys/un.h> |
| #include <setjmp.h> |
| #ifdef HAVE_SYS_PROCESSOR_H |
| #include <sys/processor.h> /* for bindprocessor() */ |
| #endif |
| |
| /* |
| * Define some magic numbers that we use for the state of the incomming |
| * request. These must be < 0 so they don't collide with a file descriptor. |
| */ |
| #define AP_PERCHILD_THISCHILD -1 |
| #define AP_PERCHILD_OTHERCHILD -2 |
| |
| /* Limit on the threads per process. Clients will be locked out if more than |
| * this * server_limit are needed. |
| * |
| * We keep this for one reason 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_THREAD_LIMIT |
| #define DEFAULT_THREAD_LIMIT 64 |
| #endif |
| |
| /* Admin can't tune ThreadLimit beyond MAX_THREAD_LIMIT. We want |
| * some sort of compile-time limit to help catch typos. |
| */ |
| #ifndef MAX_THREAD_LIMIT |
| #define MAX_THREAD_LIMIT 20000 |
| #endif |
| |
| /* 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 8 |
| #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 |
| |
| /* |
| * Actual definitions of config globals |
| */ |
| |
| static int threads_to_start = 0; /* Worker threads per child */ |
| static int min_spare_threads = 0; |
| static int max_spare_threads = 0; |
| static int max_threads = 0; |
| static int server_limit = DEFAULT_SERVER_LIMIT; |
| static int first_server_limit; |
| static int thread_limit = DEFAULT_THREAD_LIMIT; |
| static int first_thread_limit; |
| static int changed_limit_at_restart; |
| static int max_requests_per_child = 0; |
| static int num_daemons = 0; |
| static int curr_child_num = 0; |
| static int workers_may_exit = 0; |
| static int requests_this_child; |
| static int num_listenfds = 0; |
| static apr_socket_t **listenfds; |
| static jmp_buf jmpbuffer; |
| |
| struct child_info_t { |
| uid_t uid; |
| gid_t gid; |
| int sd; |
| }; |
| |
| typedef struct { |
| const char *sockname; /* The base name for the socket */ |
| const char *fullsockname; /* socket base name + extension */ |
| int sd; /* The socket descriptor */ |
| int sd2; /* The socket descriptor */ |
| } perchild_server_conf; |
| |
| typedef struct child_info_t child_info_t; |
| |
| /* Tables used to determine the user and group each child process should |
| * run as. The hash table is used to correlate a server name with a child |
| * process. |
| */ |
| static child_info_t *child_info_table; |
| static int *thread_socket_table; |
| struct ap_ctable *ap_child_table; |
| |
| /* |
| * The max child slot ever assigned, preserved across restarts. Necessary |
| * to deal with NumServers changes across AP_SIG_GRACEFUL restarts. We |
| * use this value to optimize routines that have to scan the entire child |
| * table. |
| * |
| * XXX - It might not be worth keeping this code in. There aren't very |
| * many child processes in this MPM. |
| */ |
| int ap_max_daemons_limit = -1; |
| int ap_threads_per_child; /* XXX not part of API! axe it! */ |
| |
| module AP_MODULE_DECLARE_DATA mpm_perchild_module; |
| |
| static apr_file_t *pipe_of_death_in = NULL; |
| static apr_file_t *pipe_of_death_out = NULL; |
| static apr_lock_t *pipe_of_death_mutex; |
| |
| /* *Non*-shared http_main globals... */ |
| |
| 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; |
| |
| #ifdef DEBUG_SIGSTOP |
| int raise_sigstop_flags; |
| #endif |
| |
| static apr_pool_t *pconf; /* Pool for config stuff */ |
| static apr_pool_t *pchild; /* Pool for httpd child stuff */ |
| static apr_pool_t *thread_pool_parent; /* Parent of per-thread pools */ |
| static apr_lock_t *thread_pool_parent_mutex; |
| |
| static int child_num; |
| static unsigned int my_pid; /* Linux getpid() doesn't work except in |
| main thread. Use this instead */ |
| /* Keep track of the number of worker threads currently active */ |
| static int worker_thread_count; |
| static apr_lock_t *worker_thread_count_mutex; |
| static int *worker_thread_free_ids; |
| static apr_threadattr_t *worker_thread_attr; |
| |
| /* Keep track of the number of idle worker threads */ |
| static int idle_thread_count; |
| static apr_lock_t *idle_thread_count_mutex; |
| |
| /* Locks for accept serialization */ |
| #ifdef NO_SERIALIZED_ACCEPT |
| #define SAFE_ACCEPT(stmt) APR_SUCCESS |
| #else |
| #define SAFE_ACCEPT(stmt) (stmt) |
| static apr_lock_t *process_accept_mutex; |
| #endif /* NO_SERIALIZED_ACCEPT */ |
| static apr_lock_t *thread_accept_mutex; |
| |
| AP_DECLARE(apr_status_t) ap_mpm_query(int query_code, int *result) |
| { |
| switch(query_code){ |
| case AP_MPMQ_MAX_DAEMON_USED: |
| *result = ap_max_daemons_limit; |
| return APR_SUCCESS; |
| case AP_MPMQ_IS_THREADED: |
| *result = AP_MPMQ_DYNAMIC; |
| return APR_SUCCESS; |
| case AP_MPMQ_IS_FORKED: |
| *result = AP_MPMQ_STATIC; |
| return APR_SUCCESS; |
| case AP_MPMQ_HARD_LIMIT_DAEMONS: |
| *result = server_limit; |
| return APR_SUCCESS; |
| case AP_MPMQ_HARD_LIMIT_THREADS: |
| *result = thread_limit; |
| return APR_SUCCESS; |
| case AP_MPMQ_MAX_THREADS: |
| *result = max_threads; |
| return APR_SUCCESS; |
| case AP_MPMQ_MIN_SPARE_DAEMONS: |
| *result = 0; |
| return APR_SUCCESS; |
| case AP_MPMQ_MIN_SPARE_THREADS: |
| *result = min_spare_threads; |
| return APR_SUCCESS; |
| case AP_MPMQ_MAX_SPARE_DAEMONS: |
| *result = 0; |
| return APR_SUCCESS; |
| case AP_MPMQ_MAX_SPARE_THREADS: |
| *result = max_spare_threads; |
| return APR_SUCCESS; |
| case AP_MPMQ_MAX_REQUESTS_DAEMON: |
| *result = max_requests_per_child; |
| return APR_SUCCESS; |
| case AP_MPMQ_MAX_DAEMONS: |
| *result = num_daemons; |
| return APR_SUCCESS; |
| } |
| return APR_ENOTIMPL; |
| } |
| |
| /* a clean exit from a child with proper cleanup */ |
| static void clean_child_exit(int code) |
| { |
| if (pchild) { |
| apr_pool_destroy(pchild); |
| } |
| exit(code); |
| } |
| |
| /* handle all varieties of core dumping signals */ |
| static void sig_coredump(int sig) |
| { |
| chdir(ap_coredump_dir); |
| apr_signal(sig, SIG_DFL); |
| 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. |
| */ |
| } |
| |
| static void just_die(int sig) |
| { |
| clean_child_exit(0); |
| } |
| |
| /***************************************************************** |
| * Connection structures and accounting... |
| */ |
| |
| /* volatile just in case */ |
| static int volatile shutdown_pending; |
| static int volatile restart_pending; |
| static int volatile is_graceful; |
| static int volatile child_fatal; |
| /* we don't currently track ap_my_generation, but mod_status |
| * references it so it must be defined */ |
| ap_generation_t volatile ap_my_generation=0; |
| |
| /* |
| * ap_start_shutdown() and ap_start_restart(), below, are a first stab at |
| * functions to initiate shutdown or restart without relying on signals. |
| * Previously this was initiated in sig_term() and restart() signal handlers, |
| * but we want to be able to start a shutdown/restart from other sources -- |
| * e.g. on Win32, from the service manager. Now the service manager can |
| * call ap_start_shutdown() or ap_start_restart() as appropiate. Note that |
| * these functions can also be called by the child processes, since global |
| * variables are no longer used to pass on the required action to the parent. |
| * |
| * These should only be called from the parent process itself, since the |
| * parent process will use the shutdown_pending and restart_pending variables |
| * to determine whether to shutdown or restart. The child process should |
| * call signal_parent() directly to tell the parent to die -- this will |
| * cause neither of those variable to be set, which the parent will |
| * assume means something serious is wrong (which it will be, for the |
| * child to force an exit) and so do an exit anyway. |
| */ |
| |
| static void ap_start_shutdown(void) |
| { |
| 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; |
| } |
| |
| /* do a graceful restart if graceful == 1 */ |
| static void ap_start_restart(int graceful) |
| { |
| |
| if (restart_pending == 1) { |
| /* Probably not an error - don't bother reporting it */ |
| return; |
| } |
| restart_pending = 1; |
| is_graceful = graceful; |
| if (is_graceful) { |
| apr_pool_cleanup_kill(pconf, NULL, ap_cleanup_scoreboard); |
| } |
| } |
| |
| static void sig_term(int sig) |
| { |
| ap_start_shutdown(); |
| } |
| |
| static void restart(int sig) |
| { |
| #ifndef WIN32 |
| ap_start_restart(sig == AP_SIG_GRACEFUL); |
| #else |
| ap_start_restart(1); |
| #endif |
| } |
| |
| 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 |
| } |
| |
| /***************************************************************** |
| * Here follows a long bunch of generic server bookkeeping stuff... |
| */ |
| |
| int ap_graceful_stop_signalled(void) |
| { |
| /* XXX - Does this really work? - Manoj */ |
| return is_graceful; |
| } |
| |
| /***************************************************************** |
| * Child process main loop. |
| */ |
| |
| static void process_socket(apr_pool_t *p, apr_socket_t *sock, long conn_id) |
| { |
| conn_rec *current_conn; |
| int csd; |
| apr_status_t rv; |
| int thread_num = conn_id % thread_limit; |
| ap_sb_handle_t *sbh; |
| |
| if ((rv = apr_os_sock_get(&csd, sock)) != APR_SUCCESS) { |
| ap_log_error(APLOG_MARK, APLOG_ERR, rv, NULL, "apr_os_sock_get"); |
| } |
| |
| if (csd >= FD_SETSIZE) { |
| ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_WARNING, 0, NULL, |
| "new file descriptor %d is too large; you probably need " |
| "to rebuild Apache with a larger FD_SETSIZE " |
| "(currently %d)", |
| csd, FD_SETSIZE); |
| apr_socket_close(sock); |
| return; |
| } |
| |
| if (thread_socket_table[thread_num] < 0) { |
| ap_sock_disable_nagle(sock); |
| } |
| |
| ap_create_sb_handle(&sbh, p, conn_id / thread_limit, thread_num); |
| current_conn = ap_run_create_connection(p, ap_server_conf, sock, conn_id, sbh); |
| if (current_conn) { |
| ap_process_connection(current_conn, sock); |
| ap_lingering_close(current_conn); |
| } |
| } |
| |
| static void *worker_thread(apr_thread_t *, void *); |
| |
| /* Starts a thread as long as we're below max_threads */ |
| static int start_thread(void) |
| { |
| apr_thread_t *thread; |
| int rc; |
| |
| apr_lock_acquire(worker_thread_count_mutex); |
| if (worker_thread_count < max_threads - 1) { |
| rc = apr_thread_create(&thread, worker_thread_attr, worker_thread, |
| &worker_thread_free_ids[worker_thread_count], pchild); |
| if (rc != APR_SUCCESS) { |
| ap_log_error(APLOG_MARK, APLOG_ALERT, rc, ap_server_conf, |
| "apr_thread_create: unable to create worker thread"); |
| /* 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 if we exit. */ |
| sleep(10); |
| workers_may_exit = 1; |
| apr_lock_release(worker_thread_count_mutex); |
| return 0; |
| } |
| else { |
| worker_thread_count++; |
| } |
| } |
| else { |
| static int reported = 0; |
| |
| if (!reported) { |
| ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_ERR, 0, |
| ap_server_conf, |
| "server reached MaxThreadsPerChild setting, " |
| "consider raising the MaxThreadsPerChild or " |
| "NumServers settings"); |
| reported = 1; |
| } |
| apr_lock_release(worker_thread_count_mutex); |
| return 0; |
| } |
| apr_lock_release(worker_thread_count_mutex); |
| return 1; |
| |
| } |
| /* Sets workers_may_exit if we received a character on the pipe_of_death */ |
| static void check_pipe_of_death(void) |
| { |
| apr_lock_acquire(pipe_of_death_mutex); |
| if (!workers_may_exit) { |
| int ret; |
| char pipe_read_char; |
| apr_size_t n = 1; |
| |
| ret = apr_recv(listenfds[0], &pipe_read_char, &n); |
| if (APR_STATUS_IS_EAGAIN(ret)) { |
| /* It lost the lottery. It must continue to suffer |
| * through a life of servitude. */ |
| } |
| else { |
| /* It won the lottery (or something else is very |
| * wrong). Embrace death with open arms. */ |
| workers_may_exit = 1; |
| } |
| } |
| apr_lock_release(pipe_of_death_mutex); |
| } |
| |
| /* idle_thread_count should be incremented before starting a worker_thread */ |
| |
| static void *worker_thread(apr_thread_t *thd, void *arg) |
| { |
| apr_socket_t *csd = NULL; |
| apr_pool_t *tpool; /* Pool for this thread */ |
| apr_pool_t *ptrans; /* Pool for per-transaction stuff */ |
| apr_socket_t *sd = NULL; |
| volatile int last_pollfd = 0; |
| volatile int thread_just_started = 1; |
| int srv; |
| int curr_pollfd; |
| int thread_num = *((int *) arg); |
| long conn_id = child_num * thread_limit + thread_num; |
| apr_pollfd_t *pollset; |
| int n; |
| apr_status_t rv; |
| |
| apr_lock_acquire(thread_pool_parent_mutex); |
| apr_pool_create(&tpool, thread_pool_parent); |
| apr_lock_release(thread_pool_parent_mutex); |
| apr_pool_create(&ptrans, tpool); |
| |
| (void) ap_update_child_status_from_indexes(child_num, thread_num, |
| SERVER_STARTING, |
| (request_rec *) NULL); |
| |
| apr_poll_setup(&pollset, num_listenfds+1, tpool); |
| for(n = 0; n <= num_listenfds; ++n) { |
| apr_poll_socket_add(pollset, listenfds[n], APR_POLLIN); |
| } |
| |
| while (!workers_may_exit) { |
| workers_may_exit |= (max_requests_per_child != 0) |
| && (requests_this_child <= 0); |
| if (workers_may_exit) break; |
| if (!thread_just_started) { |
| apr_lock_acquire(idle_thread_count_mutex); |
| if (idle_thread_count < max_spare_threads) { |
| idle_thread_count++; |
| apr_lock_release(idle_thread_count_mutex); |
| } |
| else { |
| apr_lock_release(idle_thread_count_mutex); |
| break; |
| } |
| } |
| else { |
| thread_just_started = 0; |
| } |
| |
| (void) ap_update_child_status_from_indexes(child_num, thread_num, |
| SERVER_READY, |
| (request_rec *) NULL); |
| |
| apr_lock_acquire(thread_accept_mutex); |
| if (workers_may_exit) { |
| apr_lock_release(thread_accept_mutex); |
| break; |
| } |
| if ((rv = SAFE_ACCEPT(apr_lock_acquire(process_accept_mutex))) |
| != APR_SUCCESS) { |
| ap_log_error(APLOG_MARK, APLOG_EMERG, rv, ap_server_conf, |
| "apr_lock_acquire failed. Attempting to shutdown " |
| "process gracefully."); |
| workers_may_exit = 1; |
| } |
| |
| while (!workers_may_exit) { |
| apr_int16_t event; |
| srv = apr_poll(pollset, &n, -1); |
| |
| if (srv != APR_SUCCESS) { |
| if (APR_STATUS_IS_EINTR(srv)) { |
| continue; |
| } |
| |
| /* apr_poll() will only return errors in catastrophic |
| * circumstances. Let's try exiting gracefully, for now. */ |
| ap_log_error(APLOG_MARK, APLOG_ERR, srv, (const server_rec *) |
| ap_server_conf, "apr_poll: (listen)"); |
| workers_may_exit = 1; |
| } |
| if (workers_may_exit) break; |
| |
| apr_poll_revents_get(&event, listenfds[0], pollset); |
| if (event & APR_POLLIN) { |
| /* A process got a signal on the shutdown pipe. Check if we're |
| * the lucky process to die. */ |
| check_pipe_of_death(); |
| continue; |
| } |
| |
| apr_poll_revents_get(&event, listenfds[1], pollset); |
| if (event & APR_POLLIN || event & APR_POLLOUT) { |
| /* This request is from another child in our current process. |
| * We should set a flag here, and then below we will read |
| * two bytes (the socket number and the NULL byte. |
| */ |
| thread_socket_table[thread_num] = AP_PERCHILD_OTHERCHILD; |
| goto got_from_other_child; |
| } |
| |
| if (num_listenfds == 1) { |
| sd = ap_listeners->sd; |
| goto got_fd; |
| } |
| else { |
| /* find a listener */ |
| curr_pollfd = last_pollfd; |
| do { |
| curr_pollfd++; |
| if (curr_pollfd > num_listenfds) { |
| curr_pollfd = 1; |
| } |
| /* XXX: Should we check for POLLERR? */ |
| apr_poll_revents_get(&event, listenfds[curr_pollfd], |
| pollset); |
| if (event & APR_POLLIN) { |
| last_pollfd = curr_pollfd; |
| sd = listenfds[curr_pollfd]; |
| goto got_fd; |
| } |
| } while (curr_pollfd != last_pollfd); |
| } |
| } |
| got_fd: |
| if (!workers_may_exit) { |
| if ((rv = apr_accept(&csd, sd, ptrans)) != APR_SUCCESS) { |
| ap_log_error(APLOG_MARK, APLOG_ERR, rv, ap_server_conf, |
| "apr_accept"); |
| } |
| if ((rv = SAFE_ACCEPT(apr_lock_release(process_accept_mutex))) |
| != APR_SUCCESS) { |
| ap_log_error(APLOG_MARK, APLOG_EMERG, rv, ap_server_conf, |
| "apr_lock_release failed. Attempting to shutdown " |
| "process gracefully."); |
| workers_may_exit = 1; |
| } |
| apr_lock_release(thread_accept_mutex); |
| apr_lock_acquire(idle_thread_count_mutex); |
| if (idle_thread_count > min_spare_threads) { |
| idle_thread_count--; |
| } |
| else { |
| if (!start_thread()) { |
| idle_thread_count--; |
| } |
| } |
| apr_lock_release(idle_thread_count_mutex); |
| got_from_other_child: |
| if (thread_socket_table[thread_num] == AP_PERCHILD_OTHERCHILD) { |
| struct msghdr msg; |
| struct cmsghdr *cmsg; |
| char sockname[80]; |
| struct iovec iov; |
| int ret, sd, dp; |
| |
| iov.iov_base = sockname; |
| iov.iov_len = 80; |
| |
| msg.msg_name = NULL; |
| msg.msg_namelen = 0; |
| msg.msg_iov = &iov; |
| msg.msg_iovlen = 1; |
| |
| cmsg = apr_palloc(ptrans, sizeof(*cmsg) + sizeof(sd)); |
| cmsg->cmsg_len = sizeof(*cmsg) + sizeof(sd); |
| msg.msg_control = (caddr_t)cmsg; |
| msg.msg_controllen = cmsg->cmsg_len; |
| msg.msg_flags = 0; |
| |
| ret = recvmsg(child_info_table[child_num].sd, &msg, 0); |
| |
| memcpy(&dp, CMSG_DATA(cmsg), sizeof(dp)); |
| |
| thread_socket_table[thread_num] = dp; |
| apr_os_sock_put(&csd, &child_info_table[child_num].sd, ptrans); |
| } |
| if (setjmp(jmpbuffer) != 1) { |
| process_socket(ptrans, csd, conn_id); |
| } |
| else { |
| thread_socket_table[thread_num] = AP_PERCHILD_THISCHILD; |
| } |
| requests_this_child--; |
| } |
| else { |
| if ((rv = SAFE_ACCEPT(apr_lock_release(process_accept_mutex))) |
| != APR_SUCCESS) { |
| ap_log_error(APLOG_MARK, APLOG_EMERG, rv, ap_server_conf, |
| "apr_lock_release failed. Attempting to shutdown " |
| "process gracefully."); |
| workers_may_exit = 1; |
| } |
| apr_lock_release(thread_accept_mutex); |
| apr_lock_acquire(idle_thread_count_mutex); |
| idle_thread_count--; |
| apr_lock_release(idle_thread_count_mutex); |
| break; |
| } |
| apr_pool_clear(ptrans); |
| } |
| |
| apr_lock_acquire(thread_pool_parent_mutex); |
| ap_update_child_status_from_indexes(child_num, thread_num, SERVER_DEAD, |
| (request_rec *) NULL); |
| apr_pool_destroy(tpool); |
| apr_lock_release(thread_pool_parent_mutex); |
| apr_lock_acquire(worker_thread_count_mutex); |
| worker_thread_count--; |
| worker_thread_free_ids[worker_thread_count] = thread_num; |
| if (worker_thread_count == 0) { |
| /* All the threads have exited, now finish the shutdown process |
| * by signalling the sigwait thread */ |
| kill(my_pid, SIGTERM); |
| } |
| apr_lock_release(worker_thread_count_mutex); |
| |
| return NULL; |
| } |
| |
| /* Set group privileges. |
| * |
| * Note that we use the username as set in the config files, rather than |
| * the lookup of to uid --- the same uid may have multiple passwd entries, |
| * with different sets of groups for each. |
| */ |
| |
| static int set_group_privs(uid_t uid, gid_t gid) |
| { |
| if (!geteuid()) { |
| const char *name; |
| |
| /* Get username if passed as a uid */ |
| |
| struct passwd *ent; |
| |
| if ((ent = getpwuid(uid)) == NULL) { |
| ap_log_error(APLOG_MARK, APLOG_ALERT, errno, NULL, |
| "getpwuid: couldn't determine user name from uid %u, " |
| "you probably need to modify the User directive", |
| (unsigned)uid); |
| return -1; |
| } |
| |
| name = ent->pw_name; |
| |
| /* |
| * Set the GID before initgroups(), since on some platforms |
| * setgid() is known to zap the group list. |
| */ |
| if (setgid(gid) == -1) { |
| ap_log_error(APLOG_MARK, APLOG_ALERT, errno, NULL, |
| "setgid: unable to set group id to Group %u", |
| (unsigned)gid); |
| return -1; |
| } |
| |
| /* Reset `groups' attributes. */ |
| |
| if (initgroups(name, gid) == -1) { |
| ap_log_error(APLOG_MARK, APLOG_ALERT, errno, NULL, |
| "initgroups: unable to set groups for User %s " |
| "and Group %u", name, (unsigned)gid); |
| return -1; |
| } |
| } |
| return 0; |
| } |
| |
| |
| static int perchild_setup_child(int childnum) |
| { |
| child_info_t *ug = &child_info_table[childnum]; |
| |
| if (ug->uid == -1 && ug->gid == -1) { |
| return unixd_setup_child(); |
| } |
| if (set_group_privs(ug->uid, ug->gid)) { |
| return -1; |
| } |
| /* Only try to switch if we're running as root */ |
| if (!geteuid() |
| && ( |
| #ifdef _OSD_POSIX |
| os_init_job_environment(server_conf, unixd_config.user_name, |
| one_process) != 0 || |
| #endif |
| setuid(ug->uid) == -1)) { |
| ap_log_error(APLOG_MARK, APLOG_ALERT, errno, NULL, |
| "setuid: unable to change to uid: %ld", |
| (long) ug->uid); |
| return -1; |
| } |
| return 0; |
| } |
| |
| static int check_signal(int signum) |
| { |
| switch (signum) { |
| case SIGTERM: |
| case SIGINT: |
| just_die(signum); |
| return 1; |
| } |
| return 0; |
| } |
| |
| static void child_main(int child_num_arg) |
| { |
| int i; |
| ap_listen_rec *lr; |
| apr_status_t rv; |
| |
| my_pid = getpid(); |
| child_num = child_num_arg; |
| apr_pool_create(&pchild, pconf); |
| |
| /*stuff to do before we switch id's, so we have permissions.*/ |
| |
| rv = SAFE_ACCEPT(apr_lock_child_init(&process_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 (perchild_setup_child(child_num)) { |
| clean_child_exit(APEXIT_CHILDFATAL); |
| } |
| |
| ap_run_child_init(pchild, ap_server_conf); |
| |
| /*done with init critical section */ |
| |
| apr_setup_signal_thread(); |
| |
| requests_this_child = max_requests_per_child; |
| |
| /* Set up the pollfd array, num_listenfds + 1 for the pipe and 1 for |
| * the child socket. |
| */ |
| listenfds = apr_pcalloc(pchild, sizeof(*listenfds) * (num_listenfds + 2)); |
| #if APR_FILES_AS_SOCKETS |
| apr_socket_from_file(&listenfds[0], pipe_of_death_in); |
| #endif |
| |
| /* The child socket */ |
| apr_os_sock_put(&listenfds[1], &child_info_table[child_num].sd, pchild); |
| |
| num_listenfds++; |
| for (lr = ap_listeners, i = 2; i <= num_listenfds; lr = lr->next, ++i) { |
| listenfds[i]=lr->sd; |
| } |
| |
| /* Setup worker threads */ |
| |
| if (threads_to_start > max_threads) { |
| threads_to_start = max_threads; |
| } |
| idle_thread_count = threads_to_start; |
| worker_thread_count = 0; |
| worker_thread_free_ids = (int *)apr_pcalloc(pchild, thread_limit * sizeof(int)); |
| for (i = 0; i < max_threads; i++) { |
| worker_thread_free_ids[i] = i; |
| } |
| apr_pool_create(&thread_pool_parent, pchild); |
| apr_lock_create(&thread_pool_parent_mutex, APR_MUTEX, APR_INTRAPROCESS, |
| APR_LOCK_DEFAULT, NULL, pchild); |
| apr_lock_create(&idle_thread_count_mutex, APR_MUTEX, APR_INTRAPROCESS, |
| APR_LOCK_DEFAULT, NULL, pchild); |
| apr_lock_create(&worker_thread_count_mutex, APR_MUTEX, APR_INTRAPROCESS, |
| APR_LOCK_DEFAULT, NULL, pchild); |
| apr_lock_create(&pipe_of_death_mutex, APR_MUTEX, APR_INTRAPROCESS, |
| APR_LOCK_DEFAULT, NULL, pchild); |
| apr_lock_create(&thread_accept_mutex, APR_MUTEX, APR_INTRAPROCESS, |
| APR_LOCK_DEFAULT, NULL, pchild); |
| |
| apr_threadattr_create(&worker_thread_attr, pchild); |
| apr_threadattr_detach_set(worker_thread_attr, 1); |
| |
| /* We are creating worker threads right now */ |
| for (i=0; i < threads_to_start; i++) { |
| /* start_thread shouldn't fail here */ |
| if (!start_thread()) { |
| break; |
| } |
| } |
| |
| apr_signal_thread(check_signal); |
| } |
| |
| 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) { |
| set_signals(); |
| ap_child_table[slot].pid = getpid(); |
| ap_child_table[slot].status = SERVER_ALIVE; |
| child_main(slot); |
| } |
| (void) ap_update_child_status_from_indexes(slot, 0, SERVER_STARTING, |
| (request_rec *) NULL); |
| |
| if ((pid = fork()) == -1) { |
| ap_log_error(APLOG_MARK, APLOG_ERR, errno, s, |
| "fork: Unable to fork new process"); |
| /* 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_NOERRNO|APLOG_WARNING, errno, |
| ap_server_conf, "processor unbind failed %d", status); |
| } |
| #endif |
| |
| RAISE_SIGSTOP(MAKE_CHILD); |
| |
| /* XXX - For an unthreaded server, a signal handler will be necessary |
| * apr_signal(SIGTERM, just_die); |
| */ |
| child_main(slot); |
| clean_child_exit(0); |
| } |
| /* else */ |
| ap_child_table[slot].pid = pid; |
| ap_child_table[slot].status = SERVER_ALIVE; |
| |
| return 0; |
| } |
| |
| /* start up a bunch of children */ |
| static int startup_children(int number_to_start) |
| { |
| int i; |
| |
| for (i = 0; number_to_start && i < num_daemons; ++i) { |
| if (ap_child_table[i].pid) { |
| continue; |
| } |
| if (make_child(ap_server_conf, i) < 0) { |
| break; |
| } |
| --number_to_start; |
| } |
| return number_to_start; |
| } |
| |
| |
| /* |
| * spawn_rate is the number of children that will be spawned on the |
| * next maintenance cycle if there aren't enough servers. It is |
| * doubled up to MAX_SPAWN_RATE, and reset only when a cycle goes by |
| * without the need to spawn. |
| */ |
| static int spawn_rate = 1; |
| #ifndef MAX_SPAWN_RATE |
| #define MAX_SPAWN_RATE (32) |
| #endif |
| static int hold_off_on_exponential_spawning; |
| |
| static void perform_child_maintenance(void) |
| { |
| int i; |
| int free_length; |
| int free_slots[MAX_SPAWN_RATE]; |
| int last_non_dead = -1; |
| |
| /* initialize the free_list */ |
| free_length = 0; |
| |
| for (i = 0; i < num_daemons; ++i) { |
| if (ap_child_table[i].pid == 0) { |
| if (free_length < spawn_rate) { |
| free_slots[free_length] = i; |
| ++free_length; |
| } |
| } |
| else { |
| last_non_dead = i; |
| } |
| |
| if (i >= ap_max_daemons_limit && free_length >= spawn_rate) { |
| break; |
| } |
| } |
| ap_max_daemons_limit = last_non_dead + 1; |
| |
| if (free_length > 0) { |
| for (i = 0; i < free_length; ++i) { |
| make_child(ap_server_conf, free_slots[i]); |
| } |
| /* 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 (spawn_rate < MAX_SPAWN_RATE) { |
| spawn_rate *= 2; |
| } |
| } |
| else { |
| spawn_rate = 1; |
| } |
| } |
| |
| static void server_main_loop(int remaining_children_to_start) |
| { |
| int child_slot; |
| apr_exit_why_e exitwhy; |
| int status; |
| apr_proc_t pid; |
| int i; |
| |
| while (!restart_pending && !shutdown_pending) { |
| ap_wait_or_timeout(&exitwhy, &status, &pid, pconf); |
| |
| if (pid.pid != -1) { |
| if (ap_process_child_status(&pid, exitwhy, status) |
| == APEXIT_CHILDFATAL) { |
| shutdown_pending = 1; |
| child_fatal = 1; |
| return; |
| } |
| /* non-fatal death... note that it's gone in the child table and |
| * clean out the status table. */ |
| child_slot = -1; |
| for (i = 0; i < ap_max_daemons_limit; ++i) { |
| if (ap_child_table[i].pid == pid.pid) { |
| child_slot = i; |
| break; |
| } |
| } |
| if (child_slot >= 0) { |
| ap_child_table[child_slot].pid = 0; |
| ap_update_child_status_from_indexes(child_slot, i, SERVER_DEAD, |
| (request_rec *) NULL); |
| |
| |
| if (remaining_children_to_start |
| && child_slot < num_daemons) { |
| /* 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 |
| * child table. Somehow we don't know about this |
| * child. |
| */ |
| ap_log_error(APLOG_MARK, APLOG_NOERRNO|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. |
| */ |
| remaining_children_to_start = \ |
| startup_children(remaining_children_to_start); |
| /* 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_child_maintenance(); |
| } |
| } |
| |
| int ap_mpm_run(apr_pool_t *_pconf, apr_pool_t *plog, server_rec *s) |
| { |
| int remaining_children_to_start; |
| int i; |
| apr_status_t rv; |
| apr_size_t one = 1; |
| |
| ap_log_pid(pconf, ap_pid_fname); |
| |
| first_server_limit = server_limit; |
| first_thread_limit = thread_limit; |
| if (changed_limit_at_restart) { |
| ap_log_error(APLOG_MARK, APLOG_WARNING | APLOG_NOERRNO, 0, s, |
| "WARNING: Attempt to change ServerLimit or ThreadLimit " |
| "ignored during restart"); |
| changed_limit_at_restart = 0; |
| } |
| |
| if ((rv = apr_file_pipe_create(&pipe_of_death_in, &pipe_of_death_out, |
| pconf)) != APR_SUCCESS) { |
| ap_log_error(APLOG_MARK, APLOG_ERR, rv, |
| (const server_rec*) ap_server_conf, |
| "apr_file_pipe_create (pipe_of_death)"); |
| exit(1); |
| } |
| if ((rv = apr_file_pipe_timeout_set(pipe_of_death_in, 0)) != APR_SUCCESS) { |
| ap_log_error(APLOG_MARK, APLOG_ERR, rv, |
| (const server_rec*) ap_server_conf, |
| "apr_file_pipe_timeout_set (pipe_of_death)"); |
| exit(1); |
| } |
| ap_server_conf = s; |
| if ((num_listenfds = ap_setup_listeners(ap_server_conf)) < 1) { |
| /* XXX: hey, what's the right way for the mpm to indicate |
| * a fatal error? */ |
| ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_ALERT, 0, s, |
| "no listening sockets available, shutting down"); |
| return 1; |
| } |
| |
| /* Initialize cross-process accept lock */ |
| ap_lock_fname = apr_psprintf(_pconf, "%s.%u", |
| ap_server_root_relative(_pconf, ap_lock_fname), |
| my_pid); |
| rv = SAFE_ACCEPT(apr_lock_create(&process_accept_mutex, APR_MUTEX, |
| APR_CROSS_PROCESS, ap_accept_lock_mech, |
| ap_lock_fname, _pconf)); |
| if (rv != APR_SUCCESS) { |
| ap_log_error(APLOG_MARK, APLOG_EMERG, rv, s, |
| "Couldn't create cross-process lock"); |
| return 1; |
| } |
| |
| if (!is_graceful) { |
| if (ap_run_pre_mpm(pconf, SB_SHARED) != OK) { |
| return 1; |
| } |
| } |
| /* Initialize the child table */ |
| if (!is_graceful) { |
| for (i = 0; i < server_limit; i++) { |
| ap_child_table[i].pid = 0; |
| } |
| } |
| |
| set_signals(); |
| |
| /* 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 = num_daemons; |
| if (!is_graceful) { |
| remaining_children_to_start = \ |
| startup_children(remaining_children_to_start); |
| } |
| 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_NOERRNO|APLOG_NOTICE, 0, ap_server_conf, |
| "%s configured -- resuming normal operations", |
| ap_get_server_version()); |
| ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_INFO, 0, ap_server_conf, |
| "Server built: %s", ap_get_server_built()); |
| restart_pending = shutdown_pending = 0; |
| |
| server_main_loop(remaining_children_to_start); |
| |
| 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 */ |
| |
| if (!child_fatal) { |
| /* 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_NOERRNO|APLOG_INFO, 0, |
| ap_server_conf, |
| "removed PID file %s (pid=%ld)", |
| pidfile, (long)getpid()); |
| } |
| |
| ap_log_error(APLOG_MARK, APLOG_NOERRNO|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; |
| } |
| |
| if (is_graceful) { |
| char char_of_death = '!'; |
| |
| ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_NOTICE, 0, |
| ap_server_conf, AP_SIG_GRACEFUL_STRING " received. " |
| "Doing graceful restart"); |
| |
| /* This is mostly for debugging... so that we know what is still |
| * gracefully dealing with existing request. |
| */ |
| |
| for (i = 0; i < num_daemons; ++i) { |
| if (ap_child_table[i].pid) { |
| ap_child_table[i].status = SERVER_DYING; |
| } |
| } |
| /* give the children the signal to die */ |
| for (i = 0; i < num_daemons;) { |
| if ((rv = apr_file_write(pipe_of_death_out, &char_of_death, |
| &one)) != APR_SUCCESS) { |
| if (APR_STATUS_IS_EINTR(rv)) continue; |
| ap_log_error(APLOG_MARK, APLOG_WARNING, rv, ap_server_conf, |
| "write pipe_of_death"); |
| } |
| i++; |
| } |
| } |
| else { |
| /* Kill 'em all. Since the child acts the same on the parents SIGTERM |
| * and a SIGHUP, we may as well use the same signal, because some user |
| * pthreads are stealing signals from us left and right. |
| */ |
| 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 */ |
| ap_log_error(APLOG_MARK, APLOG_NOERRNO|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 perchild_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_NOERRNO|APLOG_ALERT|APLOG_STARTUP, 0, |
| NULL, "no listening sockets available, shutting down"); |
| return DONE; |
| } |
| |
| ap_log_pid(pconf, ap_pid_fname); |
| |
| 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 perchild_pre_config(apr_pool_t *p, apr_pool_t *plog, apr_pool_t *ptemp) |
| { |
| static int restart_num = 0; |
| int no_detach, debug; |
| ap_directive_t *pdir; |
| int i; |
| int tmp_server_limit = DEFAULT_SERVER_LIMIT; |
| int tmp_thread_limit = DEFAULT_THREAD_LIMIT; |
| apr_status_t rv; |
| |
| debug = ap_exists_config_define("DEBUG"); |
| |
| if (debug) { |
| no_detach = one_process = 1; |
| } |
| else { |
| one_process = ap_exists_config_define("ONE_PROCESS"); |
| no_detach = ap_exists_config_define("NO_DETACH"); |
| } |
| |
| /* sigh, want this only the second time around */ |
| if (restart_num++ == 1) { |
| is_graceful = 0; |
| |
| if (!one_process) { |
| 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; |
| } |
| } |
| |
| my_pid = getpid(); |
| } |
| |
| unixd_pre_config(ptemp); |
| ap_listen_pre_config(); |
| num_daemons = DEFAULT_NUM_DAEMON; |
| threads_to_start = DEFAULT_START_THREAD; |
| min_spare_threads = DEFAULT_MIN_SPARE_THREAD; |
| max_spare_threads = DEFAULT_MAX_SPARE_THREAD; |
| max_threads = thread_limit; |
| ap_pid_fname = DEFAULT_PIDLOG; |
| ap_lock_fname = DEFAULT_LOCKFILE; |
| max_requests_per_child = DEFAULT_MAX_REQUESTS_PER_CHILD; |
| curr_child_num = 0; |
| |
| apr_cpystrn(ap_coredump_dir, ap_server_root, sizeof(ap_coredump_dir)); |
| |
| /* we need to know ServerLimit and ThreadLimit before we start processing |
| * the tree because we need to already have allocated child_info_table |
| */ |
| for (pdir = ap_conftree; pdir != NULL; pdir = pdir->next) { |
| if (!strcasecmp(pdir->directive, "ServerLimit")) { |
| if (atoi(pdir->args) > tmp_server_limit) { |
| tmp_server_limit = atoi(pdir->args); |
| if (tmp_server_limit > MAX_SERVER_LIMIT) { |
| tmp_server_limit = MAX_SERVER_LIMIT; |
| } |
| } |
| } |
| else if (!strcasecmp(pdir->directive, "ThreadLimit")) { |
| if (atoi(pdir->args) > tmp_thread_limit) { |
| tmp_thread_limit = atoi(pdir->args); |
| if (tmp_thread_limit > MAX_THREAD_LIMIT) { |
| tmp_thread_limit = MAX_THREAD_LIMIT; |
| } |
| } |
| } |
| } |
| |
| child_info_table = (child_info_t *)apr_pcalloc(p, tmp_server_limit * sizeof(child_info_t)); |
| for (i = 0; i < tmp_server_limit; i++) { |
| child_info_table[i].uid = -1; |
| child_info_table[i].gid = -1; |
| child_info_table[i].sd = -1; |
| } |
| |
| return OK; |
| } |
| |
| static int pass_request(request_rec *r) |
| { |
| apr_socket_t *thesock = ap_get_module_config(r->connection->conn_config, &core_module); |
| struct msghdr msg; |
| struct cmsghdr *cmsg; |
| int sfd; |
| struct iovec iov; |
| apr_bucket_brigade *bb = apr_brigade_create(r->pool); |
| perchild_server_conf *sconf = (perchild_server_conf *) |
| ap_get_module_config(r->server->module_config, |
| &mpm_perchild_module); |
| char *foo; |
| apr_size_t len; |
| |
| apr_pool_userdata_get((void **)&foo, "PERCHILD_BUFFER", |
| r->connection->pool); |
| len = strlen(foo); |
| |
| apr_pool_userdata_set(NULL, "PERCHILD_BUFFER", apr_pool_cleanup_null, |
| r->connection->pool); |
| |
| apr_os_sock_get(&sfd, thesock); |
| |
| iov.iov_base = NULL; |
| iov.iov_len = 0; |
| |
| msg.msg_name = NULL; |
| msg.msg_namelen = 0; |
| msg.msg_iov = &iov; |
| msg.msg_iovlen = 1; |
| |
| cmsg = apr_palloc(r->pool, sizeof(*cmsg) + sizeof(sfd)); |
| cmsg->cmsg_len = sizeof(*cmsg) + sizeof(int); |
| cmsg->cmsg_level = SOL_SOCKET; |
| cmsg->cmsg_type = SCM_RIGHTS; |
| |
| memcpy(CMSG_DATA(cmsg), &sfd, sizeof(sfd)); |
| |
| msg.msg_control = (caddr_t)cmsg; |
| msg.msg_controllen = cmsg->cmsg_len; |
| msg.msg_flags=0; |
| |
| if (sendmsg(sconf->sd2, &msg, 0) == -1) { |
| apr_pool_destroy(r->pool); |
| return -1; |
| } |
| |
| write(sconf->sd2, foo, len); |
| |
| /* ### this "read one line" doesn't seem right... shouldn't we be |
| ### reading large chunks of data or something? |
| */ |
| while (ap_get_brigade(r->input_filters, bb, AP_MODE_GETLINE, |
| APR_NONBLOCK_READ, 0) == APR_SUCCESS) { |
| apr_bucket *e; |
| APR_BRIGADE_FOREACH(e, bb) { |
| const char *str; |
| |
| apr_bucket_read(e, &str, &len, APR_NONBLOCK_READ); |
| write(sconf->sd2, str, len); |
| } |
| } |
| |
| apr_pool_destroy(r->pool); |
| return 1; |
| } |
| |
| static char *make_perchild_socket(const char *fullsockname, int sd[2]) |
| { |
| socketpair(PF_UNIX, SOCK_STREAM, 0, sd); |
| return NULL; |
| } |
| |
| static int perchild_post_config(apr_pool_t *p, apr_pool_t *plog, apr_pool_t *ptemp, server_rec *s) |
| { |
| int i; |
| server_rec *sr; |
| perchild_server_conf *sconf; |
| int def_sd[2]; |
| |
| def_sd[0] = -1; |
| def_sd[1] = -1; |
| |
| for (sr = s; sr; sr = sr->next) { |
| sconf = (perchild_server_conf *)ap_get_module_config(sr->module_config, |
| &mpm_perchild_module); |
| |
| if (sconf->sd == -1) { |
| sconf->fullsockname = apr_pstrcat(sr->process->pool, |
| sconf->sockname, ".DEFAULT", NULL); |
| if (def_sd[0] == -1) { |
| if (!make_perchild_socket(sconf->fullsockname, def_sd)) { |
| /* log error */ |
| } |
| } |
| sconf->sd = def_sd[0]; |
| sconf->sd2 = def_sd[1]; |
| } |
| } |
| |
| for (i = 0; i < num_daemons; i++) { |
| if (child_info_table[i].uid == -1) { |
| child_info_table[i].sd = def_sd[0]; |
| } |
| } |
| |
| thread_socket_table = (int *)apr_pcalloc(p, thread_limit * sizeof(int)); |
| for (i = 0; i < thread_limit; i++) { |
| thread_socket_table[i] = AP_PERCHILD_THISCHILD; |
| } |
| ap_child_table = (ap_ctable *)apr_pcalloc(p, server_limit * sizeof(ap_ctable)); |
| |
| return OK; |
| } |
| |
| static int perchild_post_read(request_rec *r) |
| { |
| ap_filter_t *f = r->connection->input_filters; |
| int thread_num = r->connection->id % thread_limit; |
| perchild_server_conf *sconf = (perchild_server_conf *) |
| ap_get_module_config(r->server->module_config, |
| &mpm_perchild_module); |
| |
| while (f) { |
| if (!strcasecmp("PERCHILD_BUFFER", f->frec->name)) { |
| ap_remove_output_filter(f); |
| break; |
| } |
| f = f->next; |
| } |
| |
| if (thread_socket_table[thread_num] != AP_PERCHILD_THISCHILD) { |
| apr_socket_t *csd = NULL; |
| |
| apr_os_sock_put(&csd, &thread_socket_table[thread_num], |
| r->connection->pool); |
| ap_sock_disable_nagle(csd); |
| ap_set_module_config(r->connection->conn_config, &core_module, csd); |
| return OK; |
| } |
| else { |
| /* sconf is the server config for this vhost, so if our socket |
| * is not the same that was set in the config, then the request |
| * needs to be passed to another child. */ |
| if (sconf->sd != child_info_table[child_num].sd) { |
| if (pass_request(r) == -1) { |
| ap_log_error(APLOG_MARK, APLOG_ERR | APLOG_NOERRNO, 0, |
| ap_server_conf, "Could not pass request to proper " |
| "child, request will not be honored."); |
| } |
| longjmp(jmpbuffer, 1); |
| } |
| return OK; |
| } |
| return OK; |
| } |
| |
| static apr_status_t perchild_buffer(ap_filter_t *f, apr_bucket_brigade *b, |
| ap_input_mode_t mode, |
| apr_read_type_e block, |
| apr_off_t readbytes) |
| { |
| apr_bucket *e; |
| apr_status_t rv; |
| char *buffer = NULL; |
| const char *str; |
| apr_size_t len; |
| |
| if ((rv = ap_get_brigade(f->next, b, mode, block, |
| readbytes)) != APR_SUCCESS) { |
| return rv; |
| } |
| |
| apr_pool_userdata_get((void **)&buffer, "PERCHILD_BUFFER", f->c->pool); |
| |
| APR_BRIGADE_FOREACH(e, b) { |
| if (e->length != 0) { |
| apr_bucket_read(e, &str, &len, APR_NONBLOCK_READ); |
| |
| if (buffer == NULL) { |
| buffer = apr_pstrndup(f->c->pool, str, len); |
| } |
| else { |
| buffer = apr_pstrcat(f->c->pool, buffer, |
| apr_pstrndup(f->c->pool, str, len), NULL); |
| } |
| } |
| } |
| apr_pool_userdata_set(buffer, "PERCHILD_BUFFER", apr_pool_cleanup_null, |
| f->c->pool); |
| |
| return APR_SUCCESS; |
| } |
| |
| static int perchild_pre_connection(conn_rec *c, void *csd) |
| { |
| ap_add_input_filter("PERCHILD_BUFFER", NULL, NULL, c); |
| return OK; |
| } |
| |
| static void perchild_hooks(apr_pool_t *p) |
| { |
| /* The perchild 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}; |
| one_process = 0; |
| |
| ap_hook_open_logs(perchild_open_logs, NULL, aszSucc, APR_HOOK_MIDDLE); |
| ap_hook_pre_config(perchild_pre_config, NULL, NULL, APR_HOOK_MIDDLE); |
| ap_hook_post_config(perchild_post_config, NULL, NULL, APR_HOOK_MIDDLE); |
| ap_hook_pre_connection(perchild_pre_connection,NULL,NULL, APR_HOOK_MIDDLE); |
| |
| /* This must be run absolutely first. If this request isn't for this |
| * server then we need to forward it to the proper child. No sense |
| * tying up this server running more post_read request hooks if it is |
| * just going to be forwarded along. |
| */ |
| ap_hook_post_read_request(perchild_post_read, NULL, NULL, |
| APR_HOOK_REALLY_FIRST); |
| ap_register_input_filter("PERCHILD_BUFFER", perchild_buffer, |
| AP_FTYPE_RESOURCE); |
| } |
| |
| static const char *set_num_daemons(cmd_parms *cmd, void *dummy, |
| const char *arg) |
| { |
| const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY); |
| if (err != NULL) { |
| return err; |
| } |
| |
| num_daemons = atoi(arg); |
| if (num_daemons > server_limit) { |
| ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL, |
| "WARNING: NumServers of %d exceeds ServerLimit value " |
| "of %d servers,", num_daemons, server_limit); |
| ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL, |
| " lowering NumServers to %d. To increase, please " |
| "see the", server_limit); |
| ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL, |
| " ServerLimit directive."); |
| num_daemons = server_limit; |
| } |
| else if (num_daemons < 1) { |
| ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL, |
| "WARNING: Require NumServers > 0, setting to 1"); |
| num_daemons = 1; |
| } |
| return NULL; |
| } |
| |
| static const char *set_threads_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; |
| } |
| |
| threads_to_start = atoi(arg); |
| if (threads_to_start > thread_limit) { |
| ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL, |
| "WARNING: StartThreads of %d exceeds ThreadLimit value" |
| " of %d threads,", threads_to_start, |
| thread_limit); |
| ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL, |
| " lowering StartThreads to %d. To increase, please" |
| " see the", thread_limit); |
| ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL, |
| " ThreadLimit directive."); |
| } |
| else if (threads_to_start < 1) { |
| ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL, |
| "WARNING: Require StartThreads > 0, setting to 1"); |
| threads_to_start = 1; |
| } |
| return NULL; |
| } |
| |
| static const char *set_min_spare_threads(cmd_parms *cmd, void *dummy, |
| const char *arg) |
| { |
| const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY); |
| if (err != NULL) { |
| return err; |
| } |
| |
| min_spare_threads = atoi(arg); |
| if (min_spare_threads <= 0) { |
| ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL, |
| "WARNING: detected MinSpareThreads set to non-positive."); |
| ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL, |
| "Resetting to 1 to avoid almost certain Apache failure."); |
| ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL, |
| "Please read the documentation."); |
| min_spare_threads = 1; |
| } |
| |
| return NULL; |
| } |
| |
| static const char *set_max_spare_threads(cmd_parms *cmd, void *dummy, |
| const char *arg) |
| { |
| const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY); |
| if (err != NULL) { |
| return err; |
| } |
| |
| max_spare_threads = atoi(arg); |
| if (max_spare_threads >= thread_limit) { |
| ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL, |
| "WARNING: detected MinSpareThreads set higher than"); |
| ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL, |
| "ThreadLimit. Resetting to %d", thread_limit); |
| max_spare_threads = thread_limit; |
| } |
| return NULL; |
| } |
| |
| static const char *set_max_threads(cmd_parms *cmd, void *dummy, const char *arg) |
| { |
| const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY); |
| if (err != NULL) { |
| return err; |
| } |
| |
| max_threads = atoi(arg); |
| if (max_threads > thread_limit) { |
| ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL, |
| "WARNING: detected MaxThreadsPerChild set higher than"); |
| ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL, |
| "ThreadLimit. Resetting to %d", thread_limit); |
| max_threads = thread_limit; |
| } |
| return NULL; |
| } |
| |
| static const char *set_child_per_uid(cmd_parms *cmd, void *dummy, const char *u, |
| const char *g, const char *num) |
| { |
| int i; |
| int max_this_time = atoi(num) + curr_child_num; |
| |
| for (i = curr_child_num; i < max_this_time; i++, curr_child_num++) { |
| child_info_t *ug = &child_info_table[i - 1]; |
| |
| if (i > num_daemons) { |
| return "Trying to use more child ID's than NumServers. Increase " |
| "NumServers in your config file."; |
| } |
| |
| ug->uid = atoi(u); |
| ug->gid = atoi(g); |
| } |
| return NULL; |
| } |
| |
| static const char *assign_childuid(cmd_parms *cmd, void *dummy, const char *uid, |
| const char *gid) |
| { |
| int i; |
| int u = atoi(uid); |
| int g = atoi(gid); |
| const char *errstr; |
| int socks[2]; |
| perchild_server_conf *sconf = (perchild_server_conf *) |
| ap_get_module_config(cmd->server->module_config, |
| &mpm_perchild_module); |
| |
| sconf->fullsockname = apr_pstrcat(cmd->pool, sconf->sockname, ".", uid, |
| ":", gid, NULL); |
| |
| if ((errstr = make_perchild_socket(sconf->fullsockname, socks))) { |
| return errstr; |
| } |
| |
| sconf->sd = socks[0]; |
| sconf->sd2 = socks[1]; |
| |
| for (i = 0; i < num_daemons; i++) { |
| if (u == child_info_table[i].uid && g == child_info_table[i].gid) { |
| child_info_table[i].sd = sconf->sd; |
| } |
| } |
| |
| 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 | APLOG_NOERRNO, 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 | APLOG_NOERRNO, 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 | APLOG_NOERRNO, 0, NULL, |
| "WARNING: Require ServerLimit > 0, setting to 1"); |
| server_limit = 1; |
| } |
| return NULL; |
| } |
| |
| static const char *set_thread_limit (cmd_parms *cmd, void *dummy, const char *arg) |
| { |
| int tmp_thread_limit; |
| |
| const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY); |
| if (err != NULL) { |
| return err; |
| } |
| |
| tmp_thread_limit = atoi(arg); |
| /* you cannot change ThreadLimit across a restart; ignore |
| * any such attempts |
| */ |
| if (first_thread_limit && |
| tmp_thread_limit != thread_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; |
| } |
| thread_limit = tmp_thread_limit; |
| |
| if (thread_limit > MAX_THREAD_LIMIT) { |
| ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL, |
| "WARNING: ThreadLimit of %d exceeds compile time limit " |
| "of %d servers,", thread_limit, MAX_THREAD_LIMIT); |
| ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL, |
| " lowering ThreadLimit to %d.", MAX_THREAD_LIMIT); |
| thread_limit = MAX_THREAD_LIMIT; |
| } |
| else if (thread_limit < 1) { |
| ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL, |
| "WARNING: Require ThreadLimit > 0, setting to 1"); |
| thread_limit = 1; |
| } |
| return NULL; |
| } |
| |
| static const command_rec perchild_cmds[] = { |
| UNIX_DAEMON_COMMANDS, |
| LISTEN_COMMANDS, |
| AP_INIT_TAKE1("NumServers", set_num_daemons, NULL, RSRC_CONF, |
| "Number of children alive at the same time"), |
| AP_INIT_TAKE1("StartThreads", set_threads_to_start, NULL, RSRC_CONF, |
| "Number of threads each child creates"), |
| AP_INIT_TAKE1("MinSpareThreads", set_min_spare_threads, NULL, RSRC_CONF, |
| "Minimum number of idle threads per child, to handle " |
| "request spikes"), |
| AP_INIT_TAKE1("MaxSpareThreads", set_max_spare_threads, NULL, RSRC_CONF, |
| "Maximum number of idle threads per child"), |
| AP_INIT_TAKE1("MaxThreadsPerChild", set_max_threads, NULL, RSRC_CONF, |
| "Maximum number of threads per child"), |
| AP_INIT_TAKE3("ChildperUserID", set_child_per_uid, NULL, RSRC_CONF, |
| "Specify a User and Group for a specific child process."), |
| AP_INIT_TAKE2("AssignUserID", assign_childuid, NULL, RSRC_CONF, |
| "Tie a virtual host to a specific child process."), |
| AP_INIT_TAKE1("ServerLimit", set_server_limit, NULL, RSRC_CONF, |
| "Maximum value of NumServers for this run of Apache"), |
| AP_INIT_TAKE1("ThreadLimit", set_thread_limit, NULL, RSRC_CONF, |
| "Maximum worker threads in a server for this run of Apache"), |
| { NULL } |
| }; |
| |
| static void *perchild_create_config(apr_pool_t *p, server_rec *s) |
| { |
| perchild_server_conf *c = (perchild_server_conf *) |
| apr_pcalloc(p, sizeof(perchild_server_conf)); |
| |
| c->sd = -1; |
| return c; |
| } |
| |
| module AP_MODULE_DECLARE_DATA mpm_perchild_module = { |
| MPM20_MODULE_STUFF, |
| NULL, /* hook to run before apache parses args */ |
| NULL, /* create per-directory config structure */ |
| NULL, /* merge per-directory config structures */ |
| perchild_create_config, /* create per-server config structure */ |
| NULL, /* merge per-server config structures */ |
| perchild_cmds, /* command apr_table_t */ |
| perchild_hooks /* register_hooks */ |
| }; |
| |
