linux c 调用 so 库

/***********编译时要链接 -l dl 库************/

#include<stdlib.h>
#include<stdio.h>
#include<unistd.h>
#include"person.h"
#include<memory.h>
#include<string.h>
#include<dlfcn.h>
int main(){

typedef int (*SELECT)(PERSON*);
typedef void (*ADD)(int ,PERSON*);
    void *handle;
    if((handle=dlopen("./libper.so",RTLD_LAZY/*RTLD_NOW*/))==NULL){
        printf("load so fail");
    }
     ADD add=(ADD)dlsym(handle,"addperson"); dlclose(handle);
}