linux-C直接调用SO动态库和生成SO动态库的函数

#include 
#include 

int main(void){
   int (*myadd)(int a,int b);//fuction pointer
   void *handle;
   
   handle=dlopen("./libmyadd.so",RTLD_LAZY);//open lib file
   myadd=dlsym(handle,"output");//call dlsym function
   

   int result=myadd(1,2);
   dlclose(handle);
   printf("%d\n",result);  
}

 以上为调用程序test8.c，以下为库程序test7.c

int output(int a,int b){
   int x=a+b;
   return x;
}

 knoppix@Microknoppix:/mnt-system/deepfuture$ gcc -shared -o libmyadd.so test7.c
knoppix@Microknoppix:/mnt-system/deepfuture$ gcc -ldl -o test8 test8.c
knoppix@Microknoppix:/mnt-system/deepfuture$ ./test8
3