System calls?

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03-26-2006

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System calls?

open, creat, read, write, lseek and close

Are they all primitive?

*Another Question: is there a different between a system call, and an i/o system call?

Last edited by PlunderBunny; 03-26-2006 at 07:11 PM..

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Gosh, this sounds a lot like homework...

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This could be someone reading a book and getting lost in the terminology. So I will give the poster the benefit of doubt and assume that the rule against homework questions is not being broken.

Yes those 6 functions are usually considered "primitive". Over the years the open system call has gained more power. creat can now be implemented as a call to open. That is the only questionable one among the group. If you look at all of the system calls you will see that a lot of them are involved in i/o. You could use the term "i/o system calls" to describe that set. But you would need some other term like, "non i/o system calls" for stuff like gettimeofday, setuid, etc. Reasonable minds could disagree over which class gets certain system calls like exit and exec.

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