CMPUT 379 Assignment 1
Blaz Pocrnja
Shawn Sydia
How to Run:
-"make mod<DRIVER NUMBER>" to compile executable.
-"./mod<DRIVER NUMBER>" to run exectuable.
*Where "<DRIVER NUMBER>" refers to 1,2,3 depending on the mem_mod version you want.
-"make clean" to delete .o files.
Note:
In our output - 0 = R/W (Read/Write)
1 = RO (Read-Only)
2 = NO (No Access)
MEM_MOD1
Allocates a block of PAGE_SIZE bytes of memory on the heap. The heap has a higher address region than the stack
(which we manipulate in mem_mod2), and is read-writable.
MEM_MOD2
Uses sbrk() to change the location of the program break, which defines the end of a process' data segment,
by incrementing the break by a PAGE_SIZE of bytes. This difference is lower in address space than the difference in MEM_MOD1,
but is similar in that the difference mem-region is read-writable as well.
MEM_MOD3
Uses mprotect() to change the access mode of two regions of memory. Specifically, at one page the access mode is changed to read-only
for 1024 bytes (our program only reads access at the beginning of each page), and then no access for the following page for 1024 bytes.