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;
}

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

local one, two, three = package.loadlib("libmylib.so", "luaopen_mylib")()
print(mylib.lsin(10))