Lab 4: Regraded

Despite a tiny setback, I managed to regraded your Lab 4.  Grades have been sent to your SoC email account (with address) which you can read by logging into sunfire and run mutt or pine, or by logging into SoC webmail.

One more common error emerges from this regrading.  I noticed many of you call either wait() or waitpid() without specifying the PID of the process you are waiting for (in the case of foreground process).  This can cause a problem, as any of the previously running background process can interrupt the wait.

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