CNT 4603 - 2019 Fall
/proc parsing assignment

Please download the program skeleton procparser.c.

Your assignment is to modify this skeleton so that it now correctly outputs heap data in this fashion on the linprog machines: 

bash-4.2$ ./procparser
Usable result from /proc/116543/maps.
Usable result from /proc/121212/maps.
Usable result from /proc/122697/maps.
Usable result from /proc/134525/maps.
Usable result from /proc/135594/maps.
Processes read : 5, total heap used = 7081984, average heap size = 1416396.75

The only code that you need to write is code for the heap_space_used() routine. Please don't modify anywhere else in the code; I don't believe that you should need any additional header files.

While on the linprog machines there will likely be only a few processes that you can read information about, you are welcome to run this code on other machines that can yield more information (particularly if you run your code as root.)

For example, on my Funtoo machine in my office, here's what I get as an ordinary user: 

procparser $ clang -o procparser procparser.c 
procparser $ ./procparser 
Usable result from /proc/26007/maps.
Usable result from /proc/26027/maps.
Usable result from /proc/26043/maps.
Usable result from /proc/26051/maps.
Usable result from /proc/26054/maps.
Usable result from /proc/26055/maps.
Usable result from /proc/26065/maps.
Usable result from /proc/26070/maps.
Usable result from /proc/26073/maps.
Usable result from /proc/26079/maps.
Usable result from /proc/26087/maps.
Usable result from /proc/26091/maps.
Usable result from /proc/26095/maps.
Usable result from /proc/26100/maps.
Usable result from /proc/26122/maps.
Usable result from /proc/26124/maps.
Usable result from /proc/26129/maps.
Usable result from /proc/26131/maps.
Usable result from /proc/26136/maps.
Usable result from /proc/26149/maps.
Usable result from /proc/26154/maps.
Usable result from /proc/26158/maps.
Usable result from /proc/26161/maps.
Usable result from /proc/26230/maps.
Usable result from /proc/26235/maps.
Usable result from /proc/26241/maps.
Usable result from /proc/26243/maps.
Usable result from /proc/26244/maps.
Usable result from /proc/26272/maps.
Usable result from /proc/26278/maps.
Usable result from /proc/26340/maps.
Usable result from /proc/26352/maps.
Usable result from /proc/26647/maps.
Usable result from /proc/28791/maps.
Usable result from /proc/28936/maps.
Usable result from /proc/29512/maps.
Usable result from /proc/29533/maps.
Usable result from /proc/29930/maps.
Usable result from /proc/29943/maps.
Usable result from /proc/29945/maps.
Usable result from /proc/29959/maps.
Usable result from /proc/30225/maps.
Usable result from /proc/30231/maps.
Usable result from /proc/30257/maps.
Usable result from /proc/30270/maps.
Usable result from /proc/30302/maps.
Processes read : 46, total heap used = 145764352, average heap size = 3168790.25

If I run this as root, I get more even more information: 

langley@localhost ~/procparser $ su - root
Password: 
localhost procparser # ./procparser 
Usable result from /proc/1/maps.
Usable result from /proc/24757/maps.
Usable result from /proc/25738/maps.
Usable result from /proc/25780/maps.
Usable result from /proc/25810/maps.
Usable result from /proc/25811/maps.
Usable result from /proc/25854/maps.
Usable result from /proc/25923/maps.
Usable result from /proc/25924/maps.
Usable result from /proc/25925/maps.
Usable result from /proc/25926/maps.
Usable result from /proc/25928/maps.
Usable result from /proc/25984/maps.
Usable result from /proc/25988/maps.
Usable result from /proc/25990/maps.
Usable result from /proc/25996/maps.
Usable result from /proc/26007/maps.
Usable result from /proc/26027/maps.
Usable result from /proc/26043/maps.
Usable result from /proc/26044/maps.
Usable result from /proc/26051/maps.
Usable result from /proc/26054/maps.
Usable result from /proc/26055/maps.
Usable result from /proc/26065/maps.
Usable result from /proc/26070/maps.
Usable result from /proc/26073/maps.
Usable result from /proc/26079/maps.
Usable result from /proc/26083/maps.
Usable result from /proc/26087/maps.
Usable result from /proc/26091/maps.
Usable result from /proc/26095/maps.
Usable result from /proc/26100/maps.
Usable result from /proc/26122/maps.
Usable result from /proc/26124/maps.
Usable result from /proc/26129/maps.
Usable result from /proc/26131/maps.
Usable result from /proc/26136/maps.
Usable result from /proc/26149/maps.
Usable result from /proc/26154/maps.
Usable result from /proc/26158/maps.
Usable result from /proc/26161/maps.
Usable result from /proc/26168/maps.
Usable result from /proc/26180/maps.
Usable result from /proc/26230/maps.
Usable result from /proc/26235/maps.
Usable result from /proc/26241/maps.
Usable result from /proc/26243/maps.
Usable result from /proc/26244/maps.
Usable result from /proc/26272/maps.
Usable result from /proc/26278/maps.
Usable result from /proc/26340/maps.
Usable result from /proc/26352/maps.
Usable result from /proc/26647/maps.
Usable result from /proc/28791/maps.
Usable result from /proc/28936/maps.
Usable result from /proc/29512/maps.
Usable result from /proc/29533/maps.
Usable result from /proc/29535/maps.
Usable result from /proc/29930/maps.
Usable result from /proc/29943/maps.
Usable result from /proc/29945/maps.
Usable result from /proc/29959/maps.
Usable result from /proc/30225/maps.
Usable result from /proc/30231/maps.
Usable result from /proc/30257/maps.
Usable result from /proc/30270/maps.
Usable result from /proc/30303/maps.
Usable result from /proc/30306/maps.
Usable result from /proc/30309/maps.
Processes read : 69, total heap used = 179240960, average heap size = 2597695.00

Your code should compile cleanly with clang using the -pedantic option.

Submission: Please submit your code on Canvas by 11:59pm on Monday, October 7.