*sleep.c 文件 *
/*學習寫lua c拓展，對于一些簡單的函數自己提供C拓展
 *ubuntu 編譯 $ gcc -fPIC -shared -llua sleep.c -o orangleliu.so -I/usr/include/lua5.1 -std=gnu99
 */

#include "unistd.h"

/*這個三個是必須的頭文件*/
#include "lua.h"
#include "lualib.h"
#include "lauxlib.h"

/*simple sleep*/
static int sleep_c (lua_State *L){
    long secs = lua_tointeger(L, -1); /*獲取參數*/
    sleep(secs);
    return 0;                         /*返回0個值，所以為0*/
}

static const struct luaL_Reg libs[] = {
    {"sleep", sleep_c},
    {NULL, NULL}  /*the end*/
};

int luaopen_orangleliu (lua_State *L){
    /*注冊lib， 上面luaopen_名稱 跟下面注冊的名稱要一致, 還要和編譯的.so文件名一致*/
    luaL_register(L, "orangleliu", libs);
    return 1;
}

$ gcc -fPIC -shared -llua sleep.c -o orangleliu.so -I/usr/include/lua5.1 -std=gnu99

test.lua
require "orangleliu"
print(os.time())
orangleliu.sleep(1)
print(os.time())

$ lua test.lua
1427118862
1427118863