linux的apache服务器

/* Copyright 1999-2004 The Apache Software Foundation * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ /* * httpd.c: simple http daemon for answering WWW file requests * * * 03-21-93 Rob McCool wrote original code (up to NCSA HTTPd 1.3) * * 03-06-95 blong * changed server number for child-alone processes to 0 and changed name * of processes * * 03-10-95 blong * Added numerous speed hacks proposed by Robert S. Thau (rst@ai.mit.edu) * including set group before fork, and call gettime before to fork * to set up libraries. * * 04-14-95 rst / rh * Brandon's code snarfed from NCSA 1.4, but tinkered to work with the * Apache server, and also to have child processes do accept() directly. * * April-July '95 rst * Extensive rework for Apache. */ #ifndef SHARED_CORE_BOOTSTRAP #ifndef SHARED_CORE_TIESTATIC #ifdef SHARED_CORE #define REALMAIN ap_main int ap_main(int argc, char *argv[]); #else #define REALMAIN main #endif #define CORE_PRIVATE #include "httpd.h" #include "http_main.h" #include "http_log.h" #include "http_config.h" /* for read_config */ #include "http_protocol.h" /* for read_request */ #include "http_request.h" /* for process_request */ #include "http_conf_globals.h" #include "http_core.h" /* for get_remote_host */ #include "http_vhost.h" #include "util_script.h" /* to force util_script.c linking */ #include "util_uri.h" #include "scoreboard.h" #include "multithread.h" #include <sys/stat.h> #ifdef USE_SHMGET_SCOREBOARD #include <sys/types.h> #include <sys/ipc.h> #include <sys/shm.h> #endif #ifdef SecureWare #include <sys/security.h> #include <sys/audit.h> #include <prot.h> #endif #ifdef WIN32 #include "../os/win32/getopt.h" #elif !defined(BEOS) && !defined(TPF) && !defined(NETWARE) && !defined(OS390) && !defined(CYGWIN) #include <netinet/tcp.h> #endif #ifdef HAVE_BSTRING_H #include <bstring.h> /* for IRIX, FD_SET calls bzero() */ #endif #ifdef HAVE_SET_DUMPABLE /* certain levels of Linux */ #include <sys/prctl.h> #endif #ifdef MULTITHREAD /* special debug stuff -- PCS */ /* Set this non-zero if you are prepared to put up with more than one log entry per second */ #define SEVERELY_VERBOSE 0 /* APD1() to APD5() are macros to help us debug. They can either * log to the screen or the error_log file. In release builds, these * macros do nothing. In debug builds, they send messages at priority * "debug" to the error log file, or if DEBUG_TO_CONSOLE is defined, * to the console. */ # ifdef _DEBUG # ifndef DEBUG_TO_CONSOLE # define APD1(a) ap_log_error(APLOG_MARK,APLOG_DEBUG|APLOG_NOERRNO,server_conf,a) # define APD2(a,b) ap_log_error(APLOG_MARK,APLOG_DEBUG|APLOG_NOERRNO,server_conf,a,b) # define APD3(a,b,c) ap_log_error(APLOG_MARK,APLOG_DEBUG|APLOG_NOERRNO,server_conf,a,b,c) # define APD4(a,b,c,d) ap_log_error(APLOG_MARK,APLOG_DEBUG|APLOG_NOERRNO,server_conf,a,b,c,d) # define APD5(a,b,c,d,e) ap_log_error(APLOG_MARK,APLOG_DEBUG|APLOG_NOERRNO,server_conf,a,b,c,d,e) # else # define APD1(a) printf("%s\n",a) # define APD2(a,b) do { printf(a,b);putchar('\n'); } while(0); # define APD3(a,b,c) do { printf(a,b,c);putchar('\n'); } while(0); # define APD4(a,b,c,d) do { printf(a,b,c,d);putchar('\n'); } while(0); # define APD5(a,b,c,d,e) do { printf(a,b,c,d,e);putchar('\n'); } while(0); # endif # else /* !_DEBUG */ # define APD1(a) # define APD2(a,b) # define APD3(a,b,c) # define APD4(a,b,c,d) # define APD5(a,b,c,d,e) # endif /* _DEBUG */ #endif /* MULTITHREAD */ /* This next function is never used. It is here to ensure that if we * make all the modules into shared libraries that core httpd still * includes the full Apache API. Without this function the objects in * main/util_script.c would not be linked into a minimal httpd. * And the extra prototype is to make gcc -Wmissing-prototypes quiet. */ API_EXPORT(void) ap_force_library_loading(void); API_EXPORT(void) ap_force_library_loading(void) { ap_add_cgi_vars(NULL); } #include "explain.h" #if !defined(max) #define max(a,b) (a > b ? a : b) #endif #ifdef WIN32 #include "../os/win32/service.h" #include "../os/win32/registry.h" #define DEFAULTSERVICENAME "Apache" #define PATHSEPARATOR '\\' #else #define PATHSEPARATOR '/' #endif #ifdef MINT long _stksize = 32768; #endif #ifdef USE_OS2_SCOREBOARD /* Add MMAP style functionality to OS/2 */ #define INCL_DOSMEMMGR #define INCL_DOSEXCEPTIONS #define INCL_DOSSEMAPHORES #include <os2.h> #include <umalloc.h> #include <stdio.h> caddr_t create_shared_heap(const char *, size_t); caddr_t get_shared_heap(const char *); #endif DEF_Explain /* Defining GPROF when compiling uses the moncontrol() function to * disable gprof profiling in the parent, and enable it only for * request processing in children (or in one_process mode). It's * absolutely required to get useful gprof results under linux * because the profile itimers and such are disabled across a * fork(). It's probably useful elsewhere as well. */ #ifdef GPROF extern void moncontrol(int); #define MONCONTROL(x) moncontrol(x) #else #define MONCONTROL(x) #endif #ifndef MULTITHREAD /* this just need to be anything non-NULL */ void *ap_dummy_mutex = &ap_dummy_mutex; #endif /* * Actual definitions of config globals... here because this is * for the most part the only code that acts on 'em. (Hmmm... mod_main.c?) */ #ifdef NETWARE BOOL ap_main_finished = FALSE; unsigned int ap_thread_stack_size = 65536; #endif int ap_thread_count = 0; API_VAR_EXPORT int ap_standalone=0; API_VAR_EXPORT int ap_configtestonly=0; int ap_docrootcheck=1; API_VAR_EXPORT uid_t ap_user_id=0; API_VAR_EXPORT char *ap_user_name=NULL; API_VAR_EXPORT gid_t ap_group_id=0; #ifdef MULTIPLE_GROUPS gid_t group_id_list[NGROUPS_MAX]; #endif API_VAR_EXPORT int ap_max_requests_per_child=0; API_VAR_EXPORT int ap_threads_per_child=0; API_VAR_EXPORT int ap_excess_requests_per_child=0; API_VAR_EXPORT char *ap_pid_fname=NULL; API_VAR_EXPORT char *ap_scoreboard_fname=NULL; API_VAR_EXPORT char *ap_lock_fname=NULL; API_VAR_EXPORT char *ap_server_argv0=NULL; API_VAR_EXPORT struct in_addr ap_bind_address={0}; API_VAR_EXPORT int ap_daemons_to_start=0; API_VAR_EXPORT int ap_daemons_min_free=0; API_VAR_EXPORT int ap_daemons_max_free=0; API_VAR_EXPORT int ap_daemons_limit=0; API_VAR_EXPORT time_t ap_restart_time=0; API_VAR_EXPORT int ap_suexec_enabled = 0; API_VAR_EXPORT int ap_listenbacklog=0; #ifdef AP_ENABLE_EXCEPTION_HOOK int ap_exception_hook_enabled=0; #endif struct accept_mutex_methods_s { void (*child_init)(pool *p); void (*init)(pool *p); void (*on)(void); void (*off)(void); char *name; }; typedef struct accept_mutex_methods_s accept_mutex_methods_s; accept_mutex_methods_s *amutex; #ifdef SO_ACCEPTFILTER int ap_acceptfilter = #ifdef AP_ACCEPTFILTER_OFF 0; #else 1; #endif #endif int ap_dump_settings = 0; API_VAR_EXPORT int ap_extended_status = 0; /* * The max child slot ever assigned, preserved across restarts. Necessary * to deal with MaxClients changes across SIGUSR1 restarts. We use this * value to optimize routines that have to scan the entire scoreboard. */ static int max_daemons_limit = -1; /* * During config time, listeners is treated as a NULL-terminated list. * child_main previously would start at the beginning of the list each time * through the loop, so a socket early on in the list could easily starve out * sockets later on in the list. The solution is to start at th