有没有办法在 Linux 上检查当前的 rpath？
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Is there a way to inspect the current rpath on Linux?
提问by Justicle
I'm aware that it is possible to use readelf -d <elf> | grep RPATHto inspect a given binary from the shell, but is it possible to do this within a process?
我知道可以使用readelf -d <elf> | grep RPATH从 shell 检查给定的二进制文件，但是是否可以在进程中执行此操作？
Something like (my completely made up system call):
类似于（我完全编造的系统调用）：
/* get a copy of current rpath into buffer */
sys_get_current_rpath(&buffer);
I'm trying to diagnose some suspect SO linking issues in our codebase, and would like to inspect the RPATH this way if possible (I'd rather not have to spawn an external script).
我正在尝试在我们的代码库中诊断一些可疑的 SO 链接问题，并希望尽可能以这种方式检查 RPATH（我宁愿不必生成外部脚本）。
采纳答案by Employed Russian
#include <stdio.h>
#include <elf.h>
#include <link.h>
int main()
{
const ElfW(Dyn) *dyn = _DYNAMIC;
const ElfW(Dyn) *rpath = NULL;
const char *strtab = NULL;
for (; dyn->d_tag != DT_NULL; ++dyn) {
if (dyn->d_tag == DT_RPATH) {
rpath = dyn;
} else if (dyn->d_tag == DT_STRTAB) {
strtab = (const char *)dyn->d_un.d_val;
}
}
if (strtab != NULL && rpath != NULL) {
printf("RPATH: %s\n", strtab + rpath->d_un.d_val);
}
return 0;
}
回答by Michael Dillon
For the record, here are a couple of commands that will show the rpathheader.
作为记录，这里有几个将显示rpath标题的命令。
objdump -x binary-or-library |grep RPATH
Maybe an even better way to do it is the following:
也许更好的方法如下：
readelf -d binary-or-library |head -20
The second command also lists the direct dependencies on other libraries followed by rpath.
第二个命令还列出了对其他库的直接依赖，后跟rpath.
回答by Oscar Andreasson
You can also use:
您还可以使用：
chrpath -l binary-or-library
