linux下写一个dlopen函数可以调用的so动态库，给出代码

#include <stdio.h> #include <dlfcn.h> int main() { // open the library void *handle = dlopen("./libhello.so", RTLD_LAZY); // reset errors dlerror(); // load the symbol from library (function add) typedef int (*hello_t)(); hello_t hello = (hello_t)dlsym(handle, "hello"); const char *dlsym_error = dlerror(); if (dlsym_error) { fprintf(stderr, "%s\n", dlsym_error); exit(1); } printf("calling hello(): %d\n", hello()); // close the library dlclose(handle); }