Using array slices with C-style fread() from file

[uncorroded via Digitalmars-d-learn]

Hi all,

I am writing a program to read device /dev/urandom file to get 
some random bytes. I am trying to bypass D's GC as I know the 
length of the buffer needed. I tried using std.stdio.File and 
rawRead but File cannot be used with @nogc. So I used 
core.stdc.stdio and used traditional C style. My code is here - 
https://dpaste.dzfl.pl/36e1df4cb99b (Also at end of post). I am 
using fread instead of read because /dev/urandom can be accessed 
by other programs (From this post - 
http://insanecoding.blogspot.in/2014/05/a-good-idea-with-bad-usage-devurandom.html ). As you can see from code, I ended up doing pointer arithmetic. Is there a way of making this work with D slices? Can they be used as C-style pointers?

My D function used for getting random bytes:

@nogc ubyte[n] rand_bytes(uint n)() {
     import core.stdc.stdio;
     FILE *fp;
     fp = fopen("/dev/urandom", "r");
     ubyte[n] buf;
     ubyte *bp = &buf[0];
     uint bread = 0;
     while (bread < n) {
         auto toread = n - bread;
         auto read = fread(bp, ubyte.sizeof, toread, fp);
         bread += read;
         bp += read;
     }
     fclose(fp);
     return buf;
}