Programming

Hey Guys

I am trying to implement the malloc function for my OS class and I am having a little trouble with it. I would be really grateful if I could get some hints on this problem.
So I am using a doubly-linked list as my data structure and I have to allocate memory for it (duh...). The problem is that I am not allowed to use malloc for this(which makes sense because I am implementing one. I laugh really hard when people use malloc in their own implemented malloc replacement; belive me I have seen them). Anyways so ya I am confused as to how could you do this. I was thinking of mmap() but that can't work as it requires a file descriptor, moreover I can only call it just once so I have no idea how to do this.
Any help will be greatly appreciated

---------- Post updated at 06:52 PM ---------- Previous update was at 06:51 PM ----------

Now i noe i am not supposed to ask hw problems but I am really confused and I just want hints. My professor is out of town and he will be back later. So i am just worried how can I do this.
Please help guys, any hints???????

---------- Post updated at 07:00 PM ---------- Previous update was at 06:52 PM ----------

Oh I forgot to mention. I am getting memory from OS using mmap and this is the code till now

int fd = open("/dev/zero", O_RDWR);

// sizeOfRegion (in bytes) needs to be evenly divisible by the page size
void *ptr = mmap(NULL, sizeOfRegion,
PROT_READ | PROT_WRITE, MAP_PRIVATE, fd, 0);

I need to allocate memory for my list in this memory. Thanks

Knowing you're not supposed to, didn't seem to stop you trying!

You can post "hw" (homework) questions, just in the appropriate forum, in accordance with the forum rules.

Here's the where and how of it.