错误：ld.so：LD_PRELOAD中的对象'getpid.so'无法预加载：忽略

When I try to use LD_PRELOAD as following,

当我尝试使用LD_PRELOAD时，如下

LD_PRELOAD=getpid.so ./testpid

I get the following error...

我收到以下错误...

ERROR: ld.so: object 'getpid.so' from LD_PRELOAD cannot be preloaded: ignored.

I compile getpid.so by using

我使用编译getpid.so

gcc -Wall -fPIC -shared -o getpid.so getpid.c

and it contains the following code...

它包含以下代码......

// getpid.c
#include <sys/syscall.h>
#include <sys/types.h>
#include <unistd.h>
#include <stdio.h>

pid_t getpid(void)
{
    printf("Hello, world!\n");
    return syscall(SYS_getpid);
}

tespid.c constains code which uses getpid as shown below and which is compiled by doing

tespid.c使用getpid的constains代码，如下所示，并通过执行编译

gcc testpid -o testpid.c

What can be the problem here? Why is LD_PRELOAD not working?

这可能是什么问题？为什么LD_PRELOAD不起作用？

// testpid.c
#include <sys/syscall.h>
#include <sys/types.h>
#include <unistd.h>
#include <stdio.h>

int main()
{
    printf( "pid = %d!\n", getpid() );

    return 0;
}

1 个解决方案

#1

Looks like the loader is unable to find getpid.so as you've not mentioned the path to the library.

看起来加载器无法找到getpid.so，因为您没有提到库的路径。

Try:

尝试：

LD_PRELOAD=/full/path/to/getpid.so ./testpid