加载共享对象库

时间:2017-09-29 05:18:35

标签: c freebsd

我从网上的一些例子中得到了这个小程序:

#include <stdio.h>
#include <stdlib.h>
#include <dlfcn.h>

int
main(int argc, char **argv)
{
    void *handle;
    double (*cosine)(double);
    char *error;

   handle = dlopen("libzapi_v2.so.1", RTLD_LAZY);

    if (!handle) {
        printf("no handle \n");
        fprintf(stderr, "%s\n", dlerror());
        exit(EXIT_FAILURE);
    }

   dlerror();    /* Clear any existing error */

   /* Writing: cosine = (double (*)(double)) dlsym(handle, "cos");
       would seem more natural, but the C99 standard leaves
       casting from "void *" to a function pointer undefined.
       The assignment used below is the POSIX.1-2003 (Technical
       Corrigendum 1) workaround; see the Rationale for the
       POSIX specification of dlsym(). */
fprintf(stderr, "handle is here \n");

   *(void **) (&cosine) = dlsym(handle, "cos");

   if ((error = dlerror()) != NULL)  {
        fprintf(stderr, "%s\n", error);
        exit(EXIT_FAILURE);
    }

   printf("%f\n", (*cosine)(2.0));
    dlclose(handle);
    exit(EXIT_SUCCESS);
}

我使用gcc -rdynamic -o np np.c编译它然后当我运行./np

我收到以下错误:

  

ld-elf.so.1:断言失败:/usr/src/libexec/rtld-elf/rtld.c:1046   中止(核心倾销)

我搜索并搜索了类似问题但找不到任何内容的人。有人可以提供一些故障排除建议吗?

这是最新的freebsd。

0 个答案:

没有答案