Apache main函数源代码
#include "apr.h"#include "apr_strings.h"#include "apr_getopt.h"#include "apr_general.h"#include "apr_lib.h"#include "apr_md5.h"#include "apr_time.h"#include "apr_version.h"#include "apu_version.h"#define APR_WANT_STDIO#define APR_WANT_STRFUNC#include "apr_want.h"#define CORE_PRIVATE#include "ap_config.h"#include "httpd.h"#include "http_main.h"#include "http_log.h"#include "http_config.h"#include "http_core.h"#include "http_vhost.h"#include "apr_uri.h"#include "util_ebcdic.h"#include "ap_mpm.h"#include "mpm_common.h"/* WARNING: Win32 binds http_main.c dynamically to the server. Please place * extern functions and global data in another appropriate module. * * Most significant main() global data can be found in http_config.c */static void show_mpm_settings(void){ int mpm_query_info; apr_status_t retval; printf("Server MPM: %s\n", ap_show_mpm()); retval = ap_mpm_query(AP_MPMQ_IS_THREADED, &mpm_query_info); if (retval == APR_SUCCESS) { printf("threaded: "); if (mpm_query_info == AP_MPMQ_DYNAMIC) { printf("yes (variable thread count)\n"); } else if (mpm_query_info == AP_MPMQ_STATIC) { printf("yes (fixed thread count)\n"); } else { printf("no\n"); } } retval = ap_mpm_query(AP_MPMQ_IS_FORKED, &mpm_query_info); if (retval == APR_SUCCESS) { printf(" forked: "); if (mpm_query_info == AP_MPMQ_DYNAMIC) { printf("yes (variable process count)\n"); } else if (mpm_query_info == AP_MPMQ_STATIC) { printf("yes (fixed process count)\n"); } else { printf("no\n"); } }}static void show_compile_settings(void){ printf("Server version: %s\n", ap_get_server_description()); printf("Server built: %s\n", ap_get_server_built()); printf("Server's Module Magic Number: %u:%u\n", MODULE_MAGIC_NUMBER_MAJOR, MODULE_MAGIC_NUMBER_MINOR); printf("Server loaded:APR %s, APR-Util %s\n", apr_version_string(), apu_version_string()); printf("Compiled using: APR %s, APR-Util %s\n", APR_VERSION_STRING, APU_VERSION_STRING); /* sizeof(foo) is long on some platforms so we might as well * make it long everywhere to keep the printf format * consistent */ printf("Architecture: %ld-bit\n", 8 * (long)sizeof(void *)); show_mpm_settings(); printf("Server compiled with....\n");#ifdef BIG_SECURITY_HOLE printf(" -D BIG_SECURITY_HOLE\n");#endif#ifdef SECURITY_HOLE_PASS_AUTHORIZATION printf(" -D SECURITY_HOLE_PASS_AUTHORIZATION\n");#endif#ifdef OS printf(" -D OS=\"" OS "\"\n");#endif#ifdef APACHE_MPM_DIR printf(" -D APACHE_MPM_DIR=\"" APACHE_MPM_DIR "\"\n");#endif#ifdef HAVE_SHMGET printf(" -D HAVE_SHMGET\n");#endif#if APR_FILE_BASED_SHM printf(" -D APR_FILE_BASED_SHM\n");#endif#if APR_HAS_SENDFILE printf(" -D APR_HAS_SENDFILE\n");#endif#if APR_HAS_MMAP printf(" -D APR_HAS_MMAP\n");#endif#ifdef NO_WRITEV printf(" -D NO_WRITEV\n");#endif#ifdef NO_LINGCLOSE printf(" -D NO_LINGCLOSE\n");#endif#if APR_HAVE_IPV6 printf(" -D APR_HAVE_IPV6 (IPv4-mapped addresses ");#ifdef AP_ENABLE_V4_MAPPED printf("enabled)\n");#else printf("disabled)\n");#endif#endif#if APR_USE_FLOCK_SERIALIZE printf(" -D APR_USE_FLOCK_SERIALIZE\n");#endif#if APR_USE_SYSVSEM_SERIALIZE printf(" -D APR_USE_SYSVSEM_SERIALIZE\n");#endif#if APR_USE_POSIXSEM_SERIALIZE printf(" -D APR_USE_POSIXSEM_SERIALIZE\n");#endif#if APR_USE_FCNTL_SERIALIZE printf(" -D APR_USE_FCNTL_SERIALIZE\n");#endif#if APR_USE_PROC_PTHREAD_SERIALIZE printf(" -D APR_USE_PROC_PTHREAD_SERIALIZE\n");#endif#if APR_USE_PTHREAD_SERIALIZE printf(" -D APR_USE_PTHREAD_SERIALIZE\n");#endif#if APR_PROCESS_LOCK_IS_GLOBAL printf(" -D APR_PROCESS_LOCK_IS_GLOBAL\n");#endif#ifdef SINGLE_LISTEN_UNSERIALIZED_ACCEPT printf(" -D SINGLE_LISTEN_UNSERIALIZED_ACCEPT\n");#endif#if APR_HAS_OTHER_CHILD printf(" -D APR_HAS_OTHER_CHILD\n");#endif#ifdef AP_HAVE_RELIABLE_PIPED_LOGS printf(" -D AP_HAVE_RELIABLE_PIPED_LOGS\n");#endif#ifdef BUFFERED_LOGS printf(" -D BUFFERED_LOGS\n");#ifdef PIPE_BUF printf(" -D PIPE_BUF=%ld\n",(long)PIPE_BUF);#endif#endif printf(" -D DYNAMIC_MODULE_LIMIT=%ld\n",(long)DYNAMIC_MODULE_LIMIT);#if APR_CHARSET_EBCDIC printf(" -D APR_CHARSET_EBCDIC\n");#endif#ifdef NEED_HASHBANG_EMUL printf(" -D NEED_HASHBANG_EMUL\n");#endif#ifdef SHARED_CORE printf(" -D SHARED_CORE\n");#endif/* This list displays the compiled in default paths: */#ifdef HTTPD_ROOT printf(" -D HTTPD_ROOT=\"" HTTPD_ROOT "\"\n");#endif#ifdef SUEXEC_BIN printf(" -D SUEXEC_BIN=\"" SUEXEC_BIN "\"\n");#endif#if defined(SHARED_CORE) && defined(SHARED_CORE_DIR) printf(" -D SHARED_CORE_DIR=\"" SHARED_CORE_DIR "\"\n");#endif#ifdef DEFAULT_PIDLOG printf(" -D DEFAULT_PIDLOG=\"" DEFAULT_PIDLOG "\"\n");#endif#ifdef DEFAULT_SCOREBOARD printf(" -D DEFAULT_SCOREBOARD=\"" DEFAULT_SCOREBOARD "\"\n");#endif#ifdef DEFAULT_LOCKFILE printf(" -D DEFAULT_LOCKFILE=\"" DEFAULT_LOCKFILE "\"\n");#endif#ifdef DEFAULT_ERRORLOG printf(" -D DEFAULT_ERRORLOG=\"" DEFAULT_ERRORLOG "\"\n");#endif#ifdef AP_TYPES_CONFIG_FILE printf(" -D AP_TYPES_CONFIG_FILE=\"" AP_TYPES_CONFIG_FILE "\"\n");#endif#ifdef SERVER_CONFIG_FILE printf(" -D SERVER_CONFIG_FILE=\"" SERVER_CONFIG_FILE "\"\n");#endif}#define TASK_SWITCH_SLEEP 10000static void destroy_and_exit_process(process_rec *process, int process_exit_value){ /* * Sleep for TASK_SWITCH_SLEEP micro seconds to cause a task switch on * OS layer and thus give possibly started piped loggers a chance to * process their input. Otherwise it is possible that they get killed * by us before they can do so. In this case maybe valueable log messages * might get lost. */ apr_sleep(TASK_SWITCH_SLEEP); apr_pool_destroy(process->pool); /* and destroy all descendent pools */ apr_terminate(); exit(process_exit_value);}static process_rec *init_process(int *argc, const char * const * *argv){ process_rec *process; apr_pool_t *cntx; apr_status_t stat; const char *failed = "apr_app_initialize()"; stat = apr_app_initialize(argc, argv, NULL); if (stat == APR_SUCCESS) { failed = "apr_pool_create()"; stat = apr_pool_create(&cntx, NULL); } if (stat != APR_SUCCESS) { /* For all intents and purposes, this is impossibly unlikely, * but APR doesn't exist yet, we can't use it for reporting * these earliest two failures; */ char ctimebuff; apr_ctime(ctimebuff, apr_time_now()); fprintf(stderr, "[%s] (%d) %s: %s failed " "to initial context, exiting\n", ctimebuff, stat, (*argv), failed); apr_terminate(); exit(1); } apr_pool_tag(cntx, "process"); ap_open_stderr_log(cntx); /* Now we have initialized apr and our logger, no more * exceptional error reporting required for the lifetime * of this server process. */ process = apr_palloc(cntx, sizeof(process_rec)); /* 分配内存，cntx为分配内存的地址 */ process->pool = cntx; apr_pool_create(&process->pconf, process->pool); apr_pool_tag(process->pconf, "pconf"); process->argc = *argc; process->argv = *argv; process->short_name = apr_filepath_name_get((*argv)); return process;}static void usage(process_rec *process){ const char *bin = process->argv; int pad_len = strlen(bin);#ifdef SHARED_CORE ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL , "Usage: %s [-R directory] [-D name] [-d directory] [-f file]", bin);#else ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL, "Usage: %s [-D name] [-d directory] [-f file]", bin);#endif ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL, " %*s [-C \"directive\"] [-c \"directive\"]", pad_len, " ");#ifdef WIN32 ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL, " %*s [-w] [-k start|restart|stop|shutdown]", pad_len, " "); ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL, " %*s [-k install|config|uninstall] [-n service_name]", pad_len, " ");#endif#ifdef AP_MPM_WANT_SIGNAL_SERVER#ifdef AP_MPM_WANT_SET_GRACEFUL_SHUTDOWN ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL, " %*s [-k start|restart|graceful|graceful-stop|stop]", pad_len, " ");#else ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL, " %*s [-k start|restart|graceful|stop]", pad_len, " ");#endif /* AP_MPM_WANT_SET_GRACEFUL_SHUTDOWN */#endif ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL, " %*s [-v] [-V] [-h] [-l] [-L] [-t] [-T] [-S]", pad_len, " "); ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL, "Options:");#ifdef SHARED_CORE ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL, "-R directory : specify an alternate location for " "shared object files");#endif ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL, "-D name : define a name for use in " "<IfDefine name> directives"); ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL, "-d directory : specify an alternate initial " "ServerRoot"); ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL, "-f file : specify an alternate ServerConfigFile"); ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL, "-C \"directive\" : process directive before reading " "config files"); ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL, "-c \"directive\" : process directive after reading " "config files");#ifdef NETWARE ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL, "-n name : set screen name");#endif#ifdef WIN32 ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL, "-n name : set service name and use its " "ServerConfigFile"); ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL, "-k start : tell Apache to start"); ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL, "-k restart : tell running Apache to do a graceful " "restart"); ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL, "-k stop|shutdown : tell running Apache to shutdown"); ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL, "-k install : install an Apache service"); ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL, "-k config : change startup Options of an Apache " "service"); ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL, "-k uninstall : uninstall an Apache service"); ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL, "-w : hold open the console window on error");#endif ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL, "-e level : show startup errors of level " "(see LogLevel)"); ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL, "-E file : log startup errors to file"); ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL, "-v : show version number"); ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL, "-V : show compile settings"); ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL, "-h : list available command line options " "(this page)"); ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL, "-l : list compiled in modules"); ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL, "-L : list available configuration " "directives"); ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL, "-t -D DUMP_VHOSTS: show parsed settings (currently only " "vhost settings)"); ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL, "-S : a synonym for -t -D DUMP_VHOSTS"); ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL, "-t -D DUMP_MODULES : show all loaded modules "); ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL, "-M : a synonym for -t -D DUMP_MODULES"); ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL, "-t : run syntax check for config files"); ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL, "-T : start without DocumentRoot(s) check"); destroy_and_exit_process(process, 1);}int main(int argc, const char * const argv[]){ char c; int configtestonly = 0; const char *confname = SERVER_CONFIG_FILE; const char *def_server_root = HTTPD_ROOT; const char *temp_error_log = NULL; const char *error; process_rec *process; server_rec *server_conf; apr_pool_t *pglobal; /* 基本池类型 */ apr_pool_t *pconf; apr_pool_t *plog; /* Pool of log streams, reset _after_ each read of conf */ apr_pool_t *ptemp; /* Pool for temporary config stuff, reset often */ apr_pool_t *pcommands; /* Pool for -D, -C and -c switches */ apr_getopt_t *opt; apr_status_t rv; module **mod; const char *optarg; APR_OPTIONAL_FN_TYPE(ap_signal_server) *signal_server; AP_MONCONTROL(0); /* turn off profiling of startup 代码分析开关 */ process = init_process(&argc, &argv); /* process_rec表示进程的结构体 */ pglobal = process->pool; pconf = process->pconf; ap_server_argv0 = process->short_name;#if APR_CHARSET_EBCDIC if (ap_init_ebcdic(pglobal) != APR_SUCCESS) { destroy_and_exit_process(process, 1); }#endif apr_pool_create(&pcommands, pglobal); /* 创建命令行参数池 */ apr_pool_tag(pcommands, "pcommands"); /* 给参数池加一个标签 */ ap_server_pre_read_config= apr_array_make(pcommands, 1, sizeof(char *)); ap_server_post_read_config = apr_array_make(pcommands, 1, sizeof(char *)); ap_server_config_defines = apr_array_make(pcommands, 1, sizeof(char *)); error = ap_setup_prelinked_modules(process); if (error) { ap_log_error(APLOG_MARK, APLOG_STARTUP|APLOG_EMERG, 0, NULL, "%s: %s", ap_server_argv0, error); destroy_and_exit_process(process, 1); } ap_run_rewrite_args(process); /* Maintain AP_SERVER_BASEARGS list in http_main.h to allow the MPM * to safely pass on our args from its rewrite_args() handler. */ apr_getopt_init(&opt, pcommands, process->argc, process->argv); while ((rv = apr_getopt(opt, AP_SERVER_BASEARGS, &c, &optarg)) == APR_SUCCESS) { char **new; switch (c) { case 'c': new = (char **)apr_array_push(ap_server_post_read_config); *new = apr_pstrdup(pcommands, optarg); break; case 'C': new = (char **)apr_array_push(ap_server_pre_read_config); *new = apr_pstrdup(pcommands, optarg); break; case 'd': def_server_root = optarg; break; case 'D': new = (char **)apr_array_push(ap_server_config_defines); *new = apr_pstrdup(pcommands, optarg); /* Setting -D DUMP_VHOSTS is equivalent to setting -S */ if (strcmp(optarg, "DUMP_VHOSTS") == 0) configtestonly = 1; /* Setting -D DUMP_MODULES is equivalent to setting -M */ if (strcmp(optarg, "DUMP_MODULES") == 0) configtestonly = 1; break; case 'e': if (strcasecmp(optarg, "emerg") == 0) { ap_default_loglevel = APLOG_EMERG; } else if (strcasecmp(optarg, "alert") == 0) { ap_default_loglevel = APLOG_ALERT; } else if (strcasecmp(optarg, "crit") == 0) { ap_default_loglevel = APLOG_CRIT; } else if (strncasecmp(optarg, "err", 3) == 0) { ap_default_loglevel = APLOG_ERR; } else if (strncasecmp(optarg, "warn", 4) == 0) { ap_default_loglevel = APLOG_WARNING; } else if (strcasecmp(optarg, "notice") == 0) { ap_default_loglevel = APLOG_NOTICE; } else if (strcasecmp(optarg, "info") == 0) { ap_default_loglevel = APLOG_INFO; } else if (strcasecmp(optarg, "debug") == 0) { ap_default_loglevel = APLOG_DEBUG; } else { usage(process); } break; case 'E': temp_error_log = apr_pstrdup(process->pool, optarg); break; case 'X': new = (char **)apr_array_push(ap_server_config_defines); *new = "DEBUG"; break; case 'f': confname = optarg; break; case 'v': printf("Server version: %s\n", ap_get_server_description()); printf("Server built: %s\n", ap_get_server_built()); destroy_and_exit_process(process, 0); case 'V': show_compile_settings(); destroy_and_exit_process(process, 0); case 'l': ap_show_modules(); destroy_and_exit_process(process, 0); case 'L': ap_show_directives(); destroy_and_exit_process(process, 0); case 't': configtestonly = 1; break; case 'T': ap_document_root_check = 0; break; case 'S': configtestonly = 1; new = (char **)apr_array_push(ap_server_config_defines); *new = "DUMP_VHOSTS"; break; case 'M': configtestonly = 1; new = (char **)apr_array_push(ap_server_config_defines); *new = "DUMP_MODULES"; break; case 'h': case '?': usage(process); } } /* bad cmdline option?then we die */ if (rv != APR_EOF || opt->ind < opt->argc) { usage(process); } apr_pool_create(&plog, pglobal); apr_pool_tag(plog, "plog"); apr_pool_create(&ptemp, pconf); apr_pool_tag(ptemp, "ptemp"); /* Note that we preflight the config file once * before reading it _again_ in the main loop. * This allows things, log files configuration * for example, to settle down. */ ap_server_root = def_server_root; if (temp_error_log) { ap_replace_stderr_log(process->pool, temp_error_log); } server_conf = ap_read_config(process, ptemp, confname, &ap_conftree); if (!server_conf) { destroy_and_exit_process(process, 1); } if (ap_run_pre_config(pconf, plog, ptemp) != OK) { ap_log_error(APLOG_MARK, APLOG_STARTUP |APLOG_ERR, 0, NULL, "Pre-configuration failed"); destroy_and_exit_process(process, 1); } rv = ap_process_config_tree(server_conf, ap_conftree, process->pconf, ptemp); if (rv == OK) { ap_fixup_virtual_hosts(pconf, server_conf); ap_fini_vhost_config(pconf, server_conf); apr_hook_sort_all(); if (configtestonly) { ap_run_test_config(pconf, server_conf); ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL, "Syntax OK"); destroy_and_exit_process(process, 0); } } signal_server = APR_RETRIEVE_OPTIONAL_FN(ap_signal_server); if (signal_server) { int exit_status; if (signal_server(&exit_status, pconf) != 0) { destroy_and_exit_process(process, exit_status); } } /* If our config failed, deal with that here. */ if (rv != OK) { destroy_and_exit_process(process, 1); } apr_pool_clear(plog); if ( ap_run_open_logs(pconf, plog, ptemp, server_conf) != OK) { ap_log_error(APLOG_MARK, APLOG_STARTUP |APLOG_ERR, 0, NULL, "Unable to open logs"); destroy_and_exit_process(process, 1); } if ( ap_run_post_config(pconf, plog, ptemp, server_conf) != OK) { ap_log_error(APLOG_MARK, APLOG_STARTUP |APLOG_ERR, 0, NULL, "Configuration Failed"); destroy_and_exit_process(process, 1); } apr_pool_destroy(ptemp); for (;;) { apr_hook_deregister_all(); apr_pool_clear(pconf); for (mod = ap_prelinked_modules; *mod != NULL; mod++) { ap_register_hooks(*mod, pconf); } /* This is a hack until we finish the code so that it only reads * the config file once and just operates on the tree already in * memory.rbb */ ap_conftree = NULL; apr_pool_create(&ptemp, pconf); apr_pool_tag(ptemp, "ptemp"); ap_server_root = def_server_root; server_conf = ap_read_config(process, ptemp, confname, &ap_conftree); if (!server_conf) { destroy_and_exit_process(process, 1); } if (ap_run_pre_config(pconf, plog, ptemp) != OK) { ap_log_error(APLOG_MARK, APLOG_STARTUP |APLOG_ERR, 0, NULL, "Pre-configuration failed"); destroy_and_exit_process(process, 1); } if (ap_process_config_tree(server_conf, ap_conftree, process->pconf, ptemp) != OK) { destroy_and_exit_process(process, 1); } ap_fixup_virtual_hosts(pconf, server_conf); ap_fini_vhost_config(pconf, server_conf); apr_hook_sort_all(); apr_pool_clear(plog); if (ap_run_open_logs(pconf, plog, ptemp, server_conf) != OK) { ap_log_error(APLOG_MARK, APLOG_STARTUP |APLOG_ERR, 0, NULL, "Unable to open logs"); destroy_and_exit_process(process, 1); } if (ap_run_post_config(pconf, plog, ptemp, server_conf) != OK) { ap_log_error(APLOG_MARK, APLOG_STARTUP |APLOG_ERR, 0, NULL, "Configuration Failed"); destroy_and_exit_process(process, 1); } apr_pool_destroy(ptemp); apr_pool_lock(pconf, 1); ap_run_optional_fn_retrieve(); if (ap_mpm_run(pconf, plog, server_conf)) break; apr_pool_lock(pconf, 0); } apr_pool_lock(pconf, 0); destroy_and_exit_process(process, 0); return 0; /* Termination 'ok' */}#ifdef AP_USING_AUTOCONF/* This ugly little hack pulls any function referenced in exports.c into * the web server.exports.c is generated during the build, and it * has all of the APR functions specified by the apr/apr.exports and * apr-util/aprutil.exports files. */const void *suck_in_APR(void);const void *suck_in_APR(void){ extern const void *ap_ugly_hack; return ap_ugly_hack;}#endif
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