System Call Table

This is a discussion on System Call Table within the C Programming forums, part of the General Programming Boards category; I am trying to find the kernel function which the system call getpid() calls when it is invoked. However, when ...

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    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!

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    Captain Crash brewbuck's Avatar
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    Quote Originally Posted by NuNn View Post
    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.
    Code:
    //try
    //{
    	if (a) do { f( b); } while(1);
    	else   do { f(!b); } while(1);
    //}

  3. #3
    spurious conceit MK27's Avatar
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    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.
    Last edited by MK27; 03-26-2009 at 01:30 PM.
    C programming resources:
    GNU C Function and Macro Index -- glibc reference manual
    The C Book -- nice online learner guide
    Current ISO draft standard
    CCAN -- new CPAN like open source library repository
    3 (different) GNU debugger tutorials: #1 -- #2 -- #3
    cpwiki -- our wiki on sourceforge

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

    --
    Mats
    Compilers can produce warnings - make the compiler programmers happy: Use them!
    Please don't PM me for help - and no, I don't do help over instant messengers.

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