Unable to find syscall number for some system calls

Unable to find syscall number for some system calls

[selvakumar nagendran]

Hello,
    I am intercepting system calls in 2.4.28 kernel
for my project work. While I was looking for syscall
numbers for system calls related to semaphores like
semop,semget..the appropriate numbers were  missing in
the asm/unistd.h file. For other system calls like
sys_pipe numbers are present in the above file. What
should I do to intercept these system calls? Where
should I look for the related syscall numbers?

Thanks,
selva


		
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Re: Unable to find syscall number for some system calls

[bert hubert]

On Wed, Dec 29, 2004 at 08:29:05PM -0800, selvakumar nagendran wrote:

>     I am intercepting system calls in 2.4.28 kernel
> for my project work. While I was looking for syscall
> numbers for system calls related to semaphores like
> semop,semget..the appropriate numbers were  missing in
> the asm/unistd.h file. For other system calls like
> sys_pipe numbers are present in the above file. What

Well, you also won't find sys_connect as these are all wrapped in
sys_socketcall. For intel, it turns out that it has been decided to wrap all
sem*() calls in sys_ipc().

./asm-i386/unistd.h:#define __NR_ipc		117

The 'royal way' to figure these things out is to trace the path from
semget() in libc to the kernel. You can download glibc from the GNU site I
think.

Good luck!

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