uhttpd是openwrt系统默认集成的轻量级服务器，采用select机制对设备性能要求较低。

/usr/sbin/uhttpd -f -h /www -r wifibox -x /cgi-bin -l /slipt -L /usr/share/lua/wifibox/main.lua -t 60 -T 30 -k 20 -A 1 -n 3 -N 100 -R -p 0.0.0.0 80

这是一类智能路由器uhttpd的运行参数，其中—h指定的是网站的根目录，静态文件请求会在会以这个目录为根目录；-L指定了调用的lua主处理程序；-x指定了cgi运行程序；源文件中的运行参数描述如下，附件为utttpd完整源码

"Usage: %s -p [addr:]port [-h docroot]\n""    -f              Do not fork to background\n"" -c file         Configuration file, default is '/etc/httpd.conf'\n""    -p [addr:]port  Bind to specified address and port, multiple allowed\n"
#ifdef HAVE_TLS"   -s [addr:]port  Like -p but provide HTTPS on this port\n""    -C file         ASN.1 server certificate file\n"" -K file         ASN.1 server private key file\n"
#endif"    -h directory    Specify the document root, default is '.'\n""   -E string       Use given virtual URL as 404 error handler\n""    -I string       Use given filename as index page for directories\n""  -S              Do not follow symbolic links outside of the docroot\n""   -D              Do not allow directory listings, send 403 instead\n"" -R              Enable RFC1918 filter\n"
#ifdef HAVE_LUA"   -l string       URL prefix for Lua handler, default is '/lua'\n""   -L file         Lua handler script, omit to disable Lua\n"
#endif
#ifdef HAVE_CGI"   -x string       URL prefix for CGI handler, default is '/cgi-bin'\n""   -i .ext=path    Use interpreter at path for files with the given extension\n"
#endif
#if defined(HAVE_CGI) || defined(HAVE_LUA)"    -t seconds      CGI and Lua script timeout in seconds, default is 60\n"
#endif"    -T seconds      Network timeout in seconds, default is 30\n"" -d string       URL decode given string\n""   -r string       Specify basic auth realm\n""  -m string       MD5 crypt given string\n"

uhttpd服务器接受的请求会根据请求头分成三类，静态文件请求，cgi请求（处理表单信息）和lua请求（功能强大实现多功能的处理和调用）

首先是lua请求，uhttpd服务器是C语言编写，通过c语言调用lua程序实现了，lua请求相关程序的处理，c语言和lua语言通过栈传送数据,下面是一个简单的c语言调用lua程序的实例

//add.c#include        <stdio.h>
#include        "lua.h"
#include        "lualib.h"
#include        "lauxlib.h"/*the lua interpreter*/
lua_State* L;
int
luaadd(int x, int y)
{int sum;
/*the function name*/lua_getglobal(L,"add");
/*the first argument*/lua_pushnumber(L, x);
/*the second argument*/lua_pushnumber(L, y);
/*call the function with 2 arguments, return 1 result.*/lua_call(L, 2, 1);
/*get the result.*/sum = (int)lua_tonumber(L, -1);
/*cleanup the return*/lua_pop(L,1);return sum;
}int
main(int argc, char *argv[])
{int sum;
/*initialize Lua*/L = lua_open();
/*load Lua base libraries*/luaL_openlibs(L);
/*load the script*/luaL_dofile(L, "add.lua");
/*call the add function*/sum = luaadd(10, 15);
/*print the result*/printf("The sum is %d \n",sum);
/*cleanup Lua*/lua_close(L);return 0;
}

add.lua
--add two numbers
function add(x,y)return x + y
end