Problem
1. Unless a file contains sensitive or confidential data, allowing other users to read the file causes no harm. (It is usually considered antisocial, however, to go snooping around in other people's files.) But what happens if a malicious process reads a message from a message queue that is being used by a server and several clients? What information does the malicious process need to know to read the message queue?
2. Write a program that does the following. Execute a loop five times: create a message queue, print the queue identifier, delete the message queue. Then execute the next loop five times: create a message queue with a key of IPC_PRIVATE, and place a message on the queue. After the program terminates, look at the message queues using ipcs (1). Explain what is happening with the queue identifiers.