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Old 03-07-2006, 03:58 AM   #1
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problem when writing a new system call

i want to know hoe to write a new system call for e.g., adding two numbers.
please help me in writing this code.
Old 03-08-2006, 02:40 PM   #2
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Old 03-08-2006, 05:51 PM   #3
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What context are you talking about? From a shell?
Old 03-25-2006, 08:40 AM   #4
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A little detail about what you have tried and what isn't working might help.

Writing a system call (Assuming your refering to a kernel syscall) is an interesting exercise in learning about how the kernel works, but it is usually a bad idea to depend on custom system calls in your software (which is'nt here nor there, but I thought I'd float out my usual disclaimer).

I'd recommend you pick up a book (Such as Understanding the Linux Kernel). It has been a while, but I believe there are a few things you need to do.

1. Put the prototype for your function in include/linux/syscalls.h. As you'll notice, almost all (if not all) system calls start with the sys_ designation.

2. Update the syscall table for your arch (or for the generic case..)

3. Write the function.

4. Write a userspace library to call the function.


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