Linux下编写Lua扩展so文件和调用方法实例

#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#include <errno.h>
#include <string.h>
 
#include <unistd.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <limits.h>
 

#include <math.h>
#include "lua.h"
#include "lualib.h"
#include "lauxlib.h"

/*  库 open 函数的前置声明   */
int luaopen_mylib(lua_State *L);

static int l_sin (lua_State *L)
{
double d = luaL_checknumber(L, 1);
lua_pushnumber(L, sin(d));
//printf("ok now is  luahook!\n");
return 1; /* number of results */
}

static const luaL_Reg mylib[] =
{
{"lsin", l_sin},
{NULL, NULL} /* 必须以NULL结尾 */
};

 int luaopen_mylib(lua_State *L)
{
  luaI_openlib(L, "mylib", mylib, 0);
return 1;
}
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如果是.cpp文件，在luaopen_mylib一定要加 extern "C", 否则导出的函数会被重命名，切记切记

编译：gcc mylibs.c -fPIC -shared -o libmylib.so -llua
Makefile文件
CXX =gcc
LIBNAME:=libmylib.so
HDRNAME:=mylibs.c
TARGETNAME:=mylibs
CNAME:=$(patsubst %,%.c,$(TARGETNAME))
ONAME:=$(patsubst %,%.o,$(TARGETNAME))
all:libmylib
libmylib: $(ONAME)
$(CXX) -g -shared -Wl,$(LIBNAME) \
-o $(LIBNAME) $(ONAME) -llua
%.o: %.c
$(CXX) -fPIC -c -Wall $(CNAME)clean:$(RM) *.o *.so
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lua调用脚本：
local one, two, three = package.loadlib("libmylib.so", "luaopen_mylib")()
print(mylib.lsin(10))
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