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Computing › C › Stdlib.h ›

atexit

Register a function to be called on exit
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Contents
  1. Interface
  2. Description
  3. Errors
  4. See Also
  5. Page Comments

Interface

#include <stdlib.h>

int atexit (void (*function)(void))

Description

The atexit function registers the given function to be called at program exit, whether via exit or via return from the program's main. Functions so registered are called in reverse order; no arguments are passed.

These functions must not call exit; if it should be necessary to terminate the process while in such a function, the _exit function should be used. Alternatively, the function may cause abnormal process termination, for example by calling abort.

At least 32 functions can always be registered, and more are allowed as long as sufficient memory can be allocated.

Example 1

#include <stdio.h>
#include <stdlib.h>
 
void bye()
{
  printf("Bye bye!\n");
}
 
void main()
{
  // register the bye() function
  atexit(bye);
 
  // this first executes the function bye()
  // and then exits with error message 0
  exit(0);
}

Output: 
Bye bye!

Errors

ENOMEM No memory was available to add the function to the list. The existing list of functions is unmodified.

See Also

exit
Last Modified: 2011-12-18 13:22:12     Page Rendered: 2012-05-22 12:28:59
 

Page Comments

 
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