Q8Operating Systems (Departmental Elective)
Question
2 marks
What is a System Call?
Answer
A System Call is a strictly controlled software interrupt utilized by user applications to demand privileged hardware operations from the Kernel.
A System Call is the absolute secure gateway between unprivileged User Mode and omnipotent Kernel Mode. When an application needs to read a hard drive, it cannot physically do it; it must execute a System Call, violently trapping the CPU into Kernel Mode to execute the math safely.