c - How do I get per-cpu stats (system, idle, nice, ...) like the "top" command does? -

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On the linux, I want to know that the "C" API has to call to get per-CPU stats

I can read and read / proc / loadavg from inside my app, but this system-wide load is top, not per-CPU information I want to tell different CPU or core.

As an example of such an application, when I run head and press "1", then I can see 4 or 8 processors / core By way: 

  CPU: 4.5% us, 0.0% SE, 0.0% NI, 95.5% ID, 0.0% wa, 0.0% Hi, 0.0% C, 0.0% cp 1: 42.2 % Us, 6.2% SE, 0.5% NI, 51.2% ID, 0.0% W, 0.0% High, 0.0% C, 0.0% C CPU 2: 3.0% Us, 1.5% SE, 0.0% NI, 94.5% ID, 0.0 % W, 0.0% Hi, 1.0% C, 0.0% cpu 3: 7.0% us, 4.7% SE, 0.0% NI, 88.3% ID, 0.0% wa, 0.0% Hi, 0.0% C, 0.0% St.   
 I tried to do  strace top , but it led the rat nest.

The file you want is / proc / stat . (You can refer to fs / proc / stat.c in the Linux kernel source.)


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