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atexit

Processes the specified function at exit.

int atexit(
   void (__cdecl *func )( void )
);

Parameter

func
Function to be called.

Return Value

atexit returns 0 if successful, or a nonzero value if an error occurs.

Remarks

The atexit function is passed the address of a function (func) to be called when the program terminates normally. Successive calls to atexit create a register of functions that are executed in last-in, first-out (LIFO) order. The functions passed to atexit cannot take parameters. atexit and _onexit use the heap to hold the register of functions. Thus, the number of functions that can be registered is limited only by heap memory.

Requirements

Routine Required header Compatibility
atexit <stdlib.h> ANSI, Win 98, Win Me, Win NT, Win 2000, Win XP

For additional compatibility information, see Compatibility in the Introduction.

Libraries

All versions of the C run-time libraries.

To generate an ANSI-compliant application, use the ANSI-standard atexit function (rather than the similar _onexit function).

Example

This program pushes four functions onto the stack of functions to be executed when atexit is called. When the program exits, these programs are executed on a last in, first out basis.

// crt_atexit.c
#include <stdlib.h>
#include <stdio.h>

void fn1( void ), fn2( void ), fn3( void ), fn4( void );

int main( void )
{
   atexit( fn1 );
   atexit( fn2 );
   atexit( fn3 );
   atexit( fn4 );
   printf( "This is executed first.\n" );
}

void fn1()
{
   printf( "next.\n" );
}

void fn2()
{
   printf( "executed " );
}

void fn3()
{
   printf( "is " );
}

void fn4()
{
   printf( "This " );
}

Output

This is executed first.
This is executed next.

See Also

Process and Environment Control Routines | abort, exit | _onexit | Run-Time Routines and .NET Framework Equivalents

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