moises wrote:

> 1-Can any body say me what libs use postgres for make system calls, for
> example LIBC? 

libc and a lot others.

> 2-Can any body talk me if some postgres process can run in Linux kernel
> space? 


> 3- Some body knows if exist some projects that ports postgres process on
> Linux kernel space.

No that we've heard lately.  (But I remember a guy with a .cu domain
asking not long ago, maybe it was you.)

> I was found C instructions like Printf, that's prohibitive for Linux kernel
> applications, for example in kernel mode we use printk.

That's because Postgres is a user-space program and there are no
intentions to change that.

> I suppose that postgres are ported in a user space only. I'm Ok?


If you prefer spanish, I suggest you subscribe to the pgsql-es-ayuda
list.  There is at least one Postgres hacker there.

Alvaro Herrera                      
The PostgreSQL Company - Command Prompt, Inc.

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