Project 2 Grading Criteria

Basic Signal Functionality - (40/100 points)

• Full Credit - ALL the following functionalities should be working correctly:
  1. Register handler
  2. Send signal
  3. Handle signal
  4. Return from signal correctly

   

• Partial Credit - If the basic signal functionality is not working, however, your code shows that you made a good effort in the project, you will receive (20 Pts) as partial credit.

SIGCHLD - (15/100 points)

• (5 Pts) SIGCHLD should be ignored if there is no registered handler.
• (10 Pts) Whenever a child process dies, a SIGCHLD should be sent to parent.

SIG_IGN & SIG_DFL - (15/100 points)

• (5 Pts) Passing SIG_IGN as a handler to a signal should result in the signal being ignored.
• (5 Pts) Passing SIG_DFL as a handler to a signal should result in the process exiting as described in the specification, except for SIGCHLD.
• (5 Pts) If a process receives a signal and no explicit signal handler has been defined for that signal by Sys_Signal, then the default signal handler will be invoked.

Testing Non-reentrant Handler Code - (10/100 points)

• (5 Pts) Handling Multiple Same Signals: Indicate that one signal is pending while executing the handler no matter how many times the signal received.
• (5 Pts) Handling Multiple Different Signals: Indicate all signals as pending once.

Handling Errors - (10/100 points)

• (2 Pts) Registering a handler for SIGKILL
• (2 Pts) Registering a handler for non-exiting signal
• (2 Pts) Sending a signal to a non-existing PID
• (2 Pts) Sending a non-existing signal
• (2 Pts) Sending a signal to a kernel process

Sys_WaitNoPID - (10/100 points)

• (5 Pts) Sys_WaitNoPID should reap any zombie child process that happens to have terminated, and whose refCount is 1.
• (5 Pts) Return ENOZOMBIES if there are no dead child processes.