🚀 go-pugleaf

Hello Everyone:

In K&R on page 171, notes that syscall.h is not std C. 
I read that they have collected function prototypes  into the file
syscalls.h. 

It is not clear to me what code they included into syscall.h. The book
does
not  show what is in this user defined header file.

I know they defined BUFSIZ, and the function prototypes for system
calls. I am wondering what this coding is for for the C language
implemented on UNIX and Linux.

I am wondering if they are just including the prototypes for
 read  (..)
and 
write (...)
or is there MUCH more such as all of the low level OS BIOS services?


TIA

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