Tag: exit handler

Interview Questions / Unix

Process Cleanups Via Exit Handlers Registered Using atexit function

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Any normal Unix process can terminate in following ways:

  • Graceful exit – Normal termination of process. For eg:
    • Returning from main, calling exit etc.
  • Ungraceful exit – Abnormal termination of process. For eg:
    • Abort signal. Due to some fatal error etc.

_exit, _EXIT and exit functions can be used to terminate the process normally. Usually exit functions do the cleanup but if needed a programmer can also define its own exit handler functions to do some specific cleanup actions needed by the program.

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