Opening Files With As A Function?

Alright,

This is confusing. The specification laid out by my prof is:

a function that receives the address of a C-style, null-terminated string containing the name of the file that holds the prefix table FILE* open(const char filename[]);
This function opens the named file for read access and returns the address of the file pointer, if successful; NULL otherwise.

void readFile (){FILE* fp = NULL;fp = fopen("file.txt", "r");}

open() and fopen() are different functionsfrom<fcntl.h> and <stdio.h> respectively. but, anyway, open() function has second argument, opening mode, giving by ORed flags