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
