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int main(int argc, char **argv) {  struct alias *alias;  bool nofork = false;  char *port;  int opt, ch;  int cur_fd;  int bound = 0; #ifdef HAVE_TLS  int n_tls = 0;  const char *tls_key = NULL, *tls_crt = NULL, *tls_ciphers = NULL; #endif #ifdef HAVE_LUA  const char *lua_prefix = NULL, *lua_handler = NULL; #endif  // 如果没有LUA插件,才会执行  BUILD_BUG_ON(sizeof(uh_buf) < PATH_MAX); 
 uh_dispatch_add(&cgi_dispatch); // 添加cgi_dispatch到dispatch_handlers链表中,后续解析cgi或者lua用  init_defaults_pre(); //初始化默认参数,如:cgi的前缀名为 /cgi-bin  /*设置信号屏蔽*/  signal(SIGPIPE, SIG_IGN);  /*用户输入的参数*/  while ((ch = getopt(argc, argv, "A:aC:c:Dd:E:e:fh:H:I:i:K:k:L:l:m:N:n:P:p:qRr:Ss:T:t:U:u:Xx:y:")) != -1) {  switch(ch) { #ifdef HAVE_TLS  case 'C':  tls_crt = optarg;  break; 
 case 'K':  tls_key = optarg;  break; 
 case 'P':  tls_ciphers = optarg;  break; 
 case 'q':  conf.tls_redirect = 1;  break; 
 case 's':  n_tls++;  /* fall through */ #else  case 'C':  case 'K':  case 'P':  case 'q':  case 's':  fprintf(stderr, "uhttpd: TLS support not compiled, "  "ignoring -%c\n", ch);  break; #endif  case 'p':  optarg = strdup(optarg);  bound += add_listener_arg(optarg, (ch == 's'));  break; 
 case 'h':  if (!realpath(optarg, uh_buf)) {  fprintf(stderr, "Error: Invalid directory %s: %s\n",  optarg, strerror(errno));  exit(1);  }  conf.docroot = strdup(uh_buf);  break; 
 case 'H':  if (uh_handler_add(optarg)) {  fprintf(stderr, "Error: Failed to load handler script %s\n",  optarg);  exit(1);  }  break; 
 case 'E':  if (optarg[0] != '/') {  fprintf(stderr, "Error: Invalid error handler: %s\n",  optarg);  exit(1);  }  conf.error_handler = optarg;  break; 
 case 'I':  if (optarg[0] == '/') {  fprintf(stderr, "Error: Invalid index page: %s\n",  optarg);  exit(1);  }  uh_index_add(optarg);  break; 
 case 'S':  conf.no_symlinks = 1;  break; 
 case 'D':  conf.no_dirlists = 1;  break; 
 case 'R':  conf.rfc1918_filter = 1;  break; 
 case 'n':  conf.max_script_requests = atoi(optarg);  break; 
 case 'N':  conf.max_connections = atoi(optarg);  break;  /*cgi文件路径前缀*/  case 'x':  fixup_prefix(optarg);  conf.cgi_prefix = optarg;  break; 
 case 'y':  alias = calloc(1, sizeof(*alias));  if (!alias) {  fprintf(stderr, "Error: failed to allocate alias\n");  exit(1);  }  alias->alias = strdup(optarg);  alias->path = strchr(alias->alias, '=');  if (alias->path)  *alias->path++ = 0;  list_add(&alias->list, &conf.cgi_alias);  break; 
 case 'i':  optarg = strdup(optarg);  port = strchr(optarg, '=');  if (optarg[0] != '.' || !port) {  fprintf(stderr, "Error: Invalid interpreter: %s\n",  optarg);  exit(1);  } 
 *port++ = 0;  uh_interpreter_add(optarg, port);  break; 
 case 't':  conf.script_timeout = atoi(optarg);  break; 
 case 'T':  conf.network_timeout = atoi(optarg);  break; 
 case 'k':  conf.http_keepalive = atoi(optarg);  break; 
 case 'A':  conf.tcp_keepalive = atoi(optarg);  break; 
 case 'f':  nofork = 1;  break; 
 case 'd':  optarg = strdup(optarg);  port = alloca(strlen(optarg) + 1);  if (!port)  return -1; 
 /* "decode" plus to space to retain compat */  for (opt = 0; optarg[opt]; opt++)  if (optarg[opt] == '+')  optarg[opt] = ' '; 
 /* opt now contains strlen(optarg) -- no need to re-scan */  if (uh_urldecode(port, opt, optarg, opt) < 0) {  fprintf(stderr, "uhttpd: invalid encoding\n");  return -1;  } 
 printf("%s", port);  return 0;  break; 
 /* basic auth realm */  case 'r':  conf.realm = optarg;  break; 
 /* md5 crypt */  case 'm':  printf("%s\n", crypt(optarg, "$1$"));  return 0;  break; 
 /* config file */  case 'c':  conf.file = optarg;  break; 
#ifdef HAVE_LUA  case 'l':  case 'L':  if (ch == 'l') {  if (lua_prefix)  fprintf(stderr, "uhttpd: Ignoring previous -%c %s\n",  ch, lua_prefix); 
 lua_prefix = optarg;  }  else {  if (lua_handler)  fprintf(stderr, "uhttpd: Ignoring previous -%c %s\n",  ch, lua_handler); 
 lua_handler = optarg;  } 
 if (lua_prefix && lua_handler) {  add_lua_prefix(lua_prefix, lua_handler);  lua_prefix = NULL;  lua_handler = NULL;  } 
 break; #else  case 'l':  case 'L':  fprintf(stderr, "uhttpd: Lua support not compiled, "  "ignoring -%c\n", ch);  break; #endif #ifdef HAVE_UBUS  case 'a':  conf.ubus_noauth = 1;  break; 
 case 'u':  conf.ubus_prefix = optarg;  break; 
 case 'U':  conf.ubus_socket = optarg;  break; 
 case 'X':  conf.ubus_cors = 1;  break; 
 case 'e':  conf.events_retry = atoi(optarg);  break; #else  case 'a':  case 'u':  case 'U':  case 'X':  case 'e':  fprintf(stderr, "uhttpd: UBUS support not compiled, "  "ignoring -%c\n", ch);  break; #endif  default:  return usage(argv[0]);  }  }  /*配置文件解析*/  uh_config_parse(); 
 if (!conf.docroot) {  if (!realpath(".", uh_buf)) { //uh_buf为当前工作目录的绝对路径指针  fprintf(stderr, "Error: Unable to determine work dir\n");  return 1;  }  conf.docroot = strdup(uh_buf); //docroot字段保存了当前工作路径  }  /*初始化默认主页和cgi绝对路径*/  init_defaults_post(); 
 if (!bound) { //如果没有监听端口成功,则报错退出  fprintf(stderr, "Error: No sockets bound, unable to continue\n");  return 1;  } 
#ifdef HAVE_TLS // 如果有TLS插件才会执行,也就是https  if (n_tls) {  if (!tls_crt || !tls_key) {//没有公匙或者没有私匙，则报错退出  fprintf(stderr, "Please specify a certificate and "  "a key file to enable SSL support\n");  return 1;  } 
 if (uh_tls_init(tls_key, tls_crt, tls_ciphers))//初始化加密  return 1;  } #endif 
#ifdef HAVE_LUA // 有LUA插件才会执行  if (lua_handler || lua_prefix) {  fprintf(stderr, "Need handler and prefix to enable Lua support\n");  return 1;  }  /*uh_plugin_init会初始化lua的插件,也就是会执行uhttpd_lua.so中的初始化函数,然后再判断是否存在lua文件,类似执行 lua luci 命令,使用lua执行自己创建的文件,如果执行错误,或者缺少某些文件则不能继续执行*/  if (!list_empty(&conf.lua_prefix) && uh_plugin_init("uhttpd_lua.so"))  return 1; #endif #ifdef HAVE_UBUS // 有UBUS插件才会执行  /*原理和LUA差不多*/  if (conf.ubus_prefix && uh_plugin_init("uhttpd_ubus.so"))  return 1; #endif  /* 加了-f 则 nofork==1,这样则不会通过fork创建子进程*/  /* fork (if not disabled) */  if (!nofork) {  switch (fork()) {  case -1:  perror("fork()");  exit(1); 
 case 0:  /* daemon setup */  if (chdir("/"))  perror("chdir()"); 
 cur_fd = open("/dev/null", O_WRONLY);  if (cur_fd > 0) {  dup2(cur_fd, 0);  dup2(cur_fd, 1);  dup2(cur_fd, 2);  } 
 break; 
 default:  exit(0);  }  }  /*运行服务器的主要函数*/  return run_server(); }