如何将外部文件/程序加载到内存中然后执行它（C++ 和 Unix）？
假设我有一个名为“execfile”的可执行文件。我想使用 C++ 程序（在 Unix 上）读取该文件，然后从内存中执行它。我知道这在 Windows 上是可能的，但我无法找到 Unix 的解决方案。
在伪代码中，它会是这样的：
declare buffer (char *)
readfile "execfile" in buffer
execute buffer
只是为了说清楚：显然我可以使用 system("execfile") 执行该文件，但是，正如我所说，这不是我想要的打算做。
谢谢。
编辑1：为了使它更清楚（以及我不能使用 dlopen 的原因）：我需要此功能的原因是因为可执行文件将动态生成，所以我不能只需在一个库中一次性构建所有这些即可。更准确地说，我正在构建一个工具，该工具首先用密钥加密可执行文件，然后它将能够执行该加密文件，首先解密它，然后执行它（我不想有一个副本文件系统上解密文件的名称）。
Let's say I have an executable file called "execfile". I want to read that file using a C++ program (on Unix) and then execute it from memory. I know this is possible on Windows but I was not able to find a solution for Unix.
In pseudo-code it would be something like this:
declare buffer (char *)
readfile "execfile" in buffer
execute buffer
Just to make it clear: obviously I could just execute the file using system("execfile"), but, as I said, this is not what I intend to do.
Thank you.
EDIT 1: To make it even more clear (and the reason why I can't use dlopen): the reason I need this functionality is because the executable files are going to be generated dynamically and so I cannot just build all of them at once in a single library. To be more precise I'm building a tool that will first encrypt an executable file with a key and then it will be able to execute that encrypted file, first decrypting it and then executing it (and I don't want to have a copy of the decrypted file on the file system).
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如果不编写堆积如山的代码，您就无法做到这一点。在 Linux 上，加载和链接 a.out 是内核设施，而不是用户模式设施。
您最好创建一个共享库并使用 dlopen 加载它。
You cannot without writing a mountain of code. Loading and linking an a.out is a kernel facility, not a user mode facility, on linux.
You'd be better off making a shared library and loading it with
dlopen.加载并运行的解决方案（不一定在 C++ 中）是使用
dlopen+dlsym加载动态库并获取指向库中定义的函数的指针。有关使用 C++ 解决问题的说明，请参阅 C++ dlopen mini HOWTO动态库中的符号。
The solution to load-and-run -- not necessarily in C++ -- is to use
dlopen+dlsymto load dynamic library and obtain a pointer to function defined in the library.See C++ dlopen mini HOWTO for description of solving problems with C++ symbols in dynamic libraries.