the example of dlsym
Posted rivsidn
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void *handle;
int i, (*fptr)(int);
/* open the needed object */
handle = dlopen("/usr/home/me/libfoo.so", RTLD_LOCAL | RTLD_LAZY);
/* find the address of function and data objects */
*(void **)(&fptr) = dlsym(handle, "my_function");
iptr = (int *)dlsym(handle, "my_object");
/* invoke function, passing value of integer as a parameter */
(*fptr)(i);
有关 *(void **)(&fptr) 为什么不直接 fptr 的解释可以参考下边连接：
https://stackoverflow.com/questions/29184745/what-does-void-funcp-do-in-this-line-of-code-involving-dlsym#
[email protected]:~/demo/C/glibc_demo/dlsym$ gcc --version
gcc (Ubuntu 5.4.0-6ubuntu1~16.04.10) 5.4.0 20160609
Copyright (C) 2015 Free Software Foundation, Inc.
这个编译器用直接用 fptr 也是没问题的。
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