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Module 1: Introduction to Operating Systems

20257m

Explain system calls and their importance in Operating Systems. Discuss various categories of system calls.

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System Calls & Importance

Interface for user programs to request kernel services (trap to kernel mode). Essential for protected hardware access.

Categories

  1. Process Control: fork, exec, exit, wait, kill
  2. File Management: open, read, write, close, unlink
  3. Device Management: ioctl, read/write device
  4. Information Maintenance: getpid, time, sysinfo
  5. Communication: pipe, shmget, send/recv
  6. Protection: chmod, chown
    Importance: provides abstraction, security, portability. Invoked via syscall instruction (int 0x80 / syscall). Library wrappers handle setup.

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