I know 11.04 is an old release but a project I'm working on demands that I map some syscalls with their syscall-numbers. Were can I find the syscall-to-number table/file in ubuntu 11.04 (x86).

Edit: I want to be able to extract the following mapping from the file:




3 Answers 3


I found them in my ubuntu 14.04 here:


Hope this is what you are looking for.

  • Hi Shiva, thanks, its what I'm looking for. For Ubuntu 11.04, I found it in /usr/src/linux-headers-2.6.38-8/include/asm-generic.unistd.h
    – cidi30bg
    Commented Dec 31, 2015 at 19:08
  • I am glad that I could be of help. I just read about it in a book(Operating System Principles by Galvin) as I am starting to learn operating systems. It was just mentioned there and I didnt know what to do with it. Can you tell me some good book to learn operating systems with practical implementations or a good online course? Thanks.:)
    – shiva
    Commented Dec 31, 2015 at 19:13
  • 1
    good suggestions have been given for your question on Quora. For the good online courses, checkout here. For the book(s) see here
    – cidi30bg
    Commented Jan 1, 2016 at 0:15

You can find it on the Ubuntu website here.

  • Hi Trevor, I added an edit in the question on the kind of mapping I want to make from the file. The link you sent doesn't have the number just the syscalls
    – cidi30bg
    Commented Dec 31, 2015 at 6:26
  • Is it not in the file at the very top of the page Commented Dec 31, 2015 at 6:35
  • Trevor can you paste the hyper-link to the file you are referring to or the name? Thanks
    – cidi30bg
    Commented Dec 31, 2015 at 6:40
  • Is it not this manpages.ubuntu.com/manpages.gz/hardy/man2/syscalls.2.gz Commented Dec 31, 2015 at 6:42
  • 1
    that file just lists syscals, but not the syscall numbers. The numbers 2.x or 2.x.x is the kernel versions. But for a particular system (x64 or x86), their is a syscall number for all syscalls. See e.g: https://filippo.io/linux-syscall-table/
    – cidi30bg
    Commented Dec 31, 2015 at 6:49

I was working on something on SEEDLabs, which is Ubuntu 16.04.1.

I found a list of the syscall numbers here :/usr/include/i386-linux-gnu/asm/unistd_32.h

Also, here is an output of my system information (ignore the date):

uname -a
Linux VM 4.8.0-36-generic #36~16.04.1-Ubuntu SMP Sun Feb 5 09:39:41 UTC 2017 i686 athlon i686 GNU/Linux

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