Bill Cunningham wrote:

>     Does glibc use system call API or the kernel's code? The whole idea of 
> stability of an OS I would think would be when BIOS interrupts are triggered 
> and kernel problems happen that user space never sees the problem. 

Glibc provides an interface and services that, among other things, do 
the work of setting up calls to the kernel.  Very few programs access 
the kernel without going through glibc, although it is possible.

The BIOS is a set of code instructions in ROM that runs in the CPU's 
real mode.  The kernel runs in protected mode and does not call any BIOS 
calls at all other than possibly some initialization.  It would just be 
too inefficient.

   -- Bruce



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