System Call Table

I am trying to find the kernel function which the system call getpid() calls when it is invoked. However, when I look at the system call table all I am able to locate is the number associated with it (20) but no location of the file is given. Where would I have to look on the system to find this. Thank you!

Originally Posted by NuNn

I am trying to find the kernel function which the system call getpid() calls when it is invoked. However, when I look at the system call table all I am able to locate is the number associated with it (20) but no location of the file is given. Where would I have to look on the system to find this. Thank you!

Most of the system calls that don't have architectural dependencies can be found in src/kernel/... Just grep for it.

If all else fails, use a sledgehammer:

Code:

$ grep -Hrl getpid /path/to/kernel/src

But be prepared to wade through the output to find the actual definition.

Personally, I just use cscope and index the kernel source.

I like this a lot for finding definitions in source code, it works like a recursive grep (eg, start at /usr/include) but there's a GUI to organize the information in a more helpful friendly way, so you can sort the wheat from the chaff or whatever, and get a better picture of context than with your normal grep.

Also I wrote it, so it is guaranteed to work for me Read the "Simple Command Lookup" under "uses" on the webpage and you will get the idea.

Or use LXR / The Linux Cross Reference - we actually use the same tool at work for our source-code.

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Mats