When a process executes a "sleep" system call, from the
perspective of the process, it simply pauses for a specified amount
of time and then resumes where it left off. Describe, in detail,
what a sleep system call looks like from the perspective of the
operating system.
Regarding system calls:
What is a system call?
For each of the following system calls, give a condition that
would cause it to fail: 1) open; 2) fork; and 3)
exec.