Difference between exit() and _exit() function

Explain the difference between exit() and _exit() function.

exit() does cleanup work like closing file descriptor, file stream and so on, while _exit() does not.

The following are the differences between exit() and _exit() functions:

- io buffers are flushed by exit() and executes some functions those are registered by atexit().

- _exit() ends the process without invoking the functions which are registered by atexit().
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