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For a given Ubuntu machine how can I figure out the system call number and its corresponding system call function name? Also, would these differ across a 32 bit and a 64 bit machine of the same release?

I'm trying this specifically for "Precise".

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Take a look at /usr/include/x86_64-linux-gnu/asm/unistd.h (64-bit Ubuntu). I assume that's what you are looking for.

This file in turn includes other files in /usr/include/x86_64-linux-gnu/asm/, like unistd_32.h or unistd_64.h, where you will find the actual system call numbers. So to answer your second question - yes, these numbers may differ across 32-bit and 64-bit flavors of a particular Ubuntu version.

Edit: Note that the above paths refer to 64-bit Ubuntu. This would be slightly different for a 32-bit Ubuntu. I don't have one here to check, but /usr/include/asm/unistd.h may be a good guess. If all fails, run locate unistd.h.

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