Atexit
atexit is a C standard-library function that registers a function to execute during normal program termination.
Modern C, Third Edition
atexit is a C standard-library function that registers a function to be called during normal program termination.
- How it is used
- Registers cleanup code for normal program termination.
- How deep it goes
- Defines registration and function-reference syntax, but deliberately omits detailed handler mechanics.
- Examples
- Demonstrates a sayGoodBye handler that reports errors and writes a farewell message.
- What you can do after
- Apply atexit to register memory cleanup or termination logging before normal program completion.
Modern C
atexit is the C standard library function that registers a function to be called during normal program termination.
- How it is used
- Registers cleanup or reporting code for normal program termination.
- How deep it goes
- Defines registration syntax and behavior through one example, but defers detailed function-parameter mechanics.
- Examples
- Uses a sayGoodBye handler that checks errno, reports errors, writes to stderr, and represents cleanup work.
- What you can do after
- Apply it by registering a no-argument handler for cleanup or status reporting during normal termination.
Related concepts
- call_oncecontrasts with · call_once is a threading operation that coordinates callers so a specified callback is successfully executed at most once for a given once-control object.
- exitconfigures · exit is a standard-library function that terminates normal program execution after performing required termination processing, without ordinarily unwinding active automatic objects.
- termination handleruses · A termination handler is an application-supplied function registered to execute during a program’s termination processing.
- callbackuses · A callback is a function or other callable supplied to software for invocation later in response to a specified event, condition, or point in execution.
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