调用共享对象在第二次崩溃

Question

I have created a ".so" file and invoked from my code. It works very well for the first time, and I am getting the desired result, whereas when the same so is invoked for the second time its getting crashed. The below is my code. Am I doing anything wrong.

#include <dlfcn.h>
#include <stdio.h> /*for printf() */
#include <stdlib.h> /* for exit() */
#include <FaceRecognition.h>
#include <string>

using namespace std;

typedef void (*pf)( string, string, string );

int func ()
{
 void *lib;
 pf greet;

 const char * err;

    lib=dlopen("/home/libh.so", RTLD_NOW);

    if (!lib)
    {
     printf("failed to open hello.so: %s \n", dlerror());
     exit(1);
    }
    dlerror(); /*first clear any previous error; redundant 
               in this case but a useful habit*/
    greet= (pf) dlsym(lib, "sample");/*locate hello() */

    err=dlerror();/*check for errors and copy error message*/
    if (err)
    {
     printf("failed to locate hello(): %s \n", err);
     exit(1);
    }

    greet( "auth", "/home", "/home/train1.gal" ); /*call hello() */

    dlclose(lib);

 return 0;
}


int main () {
    func();  --> getting the expected result for the first time
    func();  --> getting crashed here ( core dumbed)

}

Answer 1

I think you have to use

lib=dlmopen(LM_ID_NEWLM, "/home/libh.so", RTLD_NOW);

if you want to load the same shared library multiple times. Take a look at this post