为什么一旦加载可执行文件，运行时LD_LIBRARY_PATH中的更改就不会反映在可执行文件上 [英] Why change in LD_LIBRARY_PATH at Runtime dosen't Reflect on the Executable once the Executable gets loaded

问题描述

我正在尝试从C ++程序更改LD_LIBRARY_PATH.我可以使用getenv("LD_LIBRARY_PATH")获取其值，并使用 setenv() (而且我知道这是可行的，因为当我再次调用getenv("LD_LIBRARY_PATH")时，会得到更新的值)，但是从程序内部更改其值不会对其产生任何影响:我仍然收到此错误消息:

I'm trying to change the LD_LIBRARY_PATH from my C++ program. I'm able to get its value using getenv("LD_LIBRARY_PATH") and set its value using setenv() (and I know that this is working, because when I call getenv("LD_LIBRARY_PATH") again, I get the updated value), but changing its value from inside the program isn't having any effect on it: I still get this error-message:

Failed to Load the shared library file

如果我在加载可执行文件或启动应用程序之前设置该值，那么它将正常工作.

If I set the value before the executable gets loaded or the application is started, it works fine.

推荐答案

不幸的是，从正在运行的程序中设置LD_LIBRARY_PATH不会对其产生影响.原因是LD_LIBRARY_PATH由动态链接加载程序(ld.so)处理，这是启动程序的程序.您的程序本身不会处理LD_LIBRARY_PATH，因此对其进行更改将无效.

Unfortunately setting LD_LIBRARY_PATH from within a running program will have no effect on it. The reason for this is that LD_LIBRARY_PATH is processed by the dynamic link loader (ld.so), which is the program which starts your program. Your program itself doesn't process LD_LIBRARY_PATH so changing it will have no effect.

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