Write a batch processing queue manager and a queue submission program. The queue manager will need to be kept running most the time and should monitor the queue for command files to be processed. When a file appears, begin executing it by forking a child process running the bash shell to process the commands in the command file and then remove the entry from the queue.

Use shared memory to hold the batch queue. Make sure you test for queue full upon submission and handle problems appropriately.

Include a cancel command that can be used by any user to remove any entry from the queue. If the entry is currently being executed, terminate the execution.

During execution, output should be redirected and logged into a log file.

Write a program that will print the list of files in the queue. Include an entry number to make it easier to specify which entry to cancel.

Summary of Requirements

• A Batch Queue Spooler program that monitors the batch queue for command files to be executed. When a file appears (because it has been added) in the queue, the spooler should run the bash program to execute it. Most of the time the spooler should sleep and wake up periodically to check the queue for files to be executed. Only one command file should be executed at a time.
• A Submit command (program) that will submit a file name (and directory path) into the batch queue for execution. A nice improvement is for the submit program to issue a wakeup signal to the spooler program so that program can sleep for longer periods of time knowing that it will be woken up if a file is submitted for execution.
• A List Batch Queue command that will print the list of files in the batch queue being printed and waiting to be printed. The list should give any information that will be necessary in specifying which entry is to be deleted or canceled.
• A Delete command that will delete an entry from the queue so that it does not get executed. If the entry is in the process of executing, it should be terminated.