如何使用C获得Linux顶级输出

Question

I am trying to get the CPU usage and details of all the running processes on embedded Linux while a C test is running. Is there a top equivalent in C that I could use ?

Answer 1

我不确定top哪个方面会让您感到困惑，但请看一下top的源代码 。

Answer 2

I think you need to parse the /proc file system. The kernel has a special file system which is normally mounted at /proc with a unique directory for each process (eg. /proc/30 belongs to the process with PID=30). The files in these directories are all text files and contains lots of info on the running processes.

Answer 3

Instead of top , you should probably use ps with the right arguments and you can parse the output.

You'll have to call that with a system call or popen from your C code. You cannot get this information strictly inside your C code (at least I don't think you can).