🚀 go-pugleaf

I'm a bit confused about using mmap - it's not clear what "fd"
in the man page refers to:


     caddr_t mmap(addr, len, prot, flags, fd, off)
     caddr_t addr;
     size_t len;
     int prot, flags, fd;
     off_t off;

DESCRIPTION
     mmap() establishes a mapping between the  process's  address
     space  at  an  address pa for len bytes to the memory object
     represented by fd at off for len bytes.  

What is this memory object pointed to by fd, and how do I define
fd?   I want to map some pages created by valloc() to another
virtual address space.  Can I use mmap() for this purpose?

Beth Freeman
freeman-elisabeth@cs.yale.edu