C atexit() function

C atexit() function - Processes the specified function at exit

Syntax atexit() function

int atexit(void (*func)(void))

The atexit() function is used to register the function pointed to by func, to be called without arguments at normal program termination.

Parameters atexit() function

Return value from atexit()

• Upon successful completion, atexit() shall return 0.
• Otherwise, it shall return a non-zero value.

Example: atexit() function

The following example shows the usage of atexit() function.

#include <stdlib.h>
#include <stdio.h>

void test1(void), test2(void), test3(void), test4(void);

int main( void )
{
   atexit(test1);
   atexit(test2);
   atexit(test3);
   atexit(test4);
   printf("From Main function....!\n");
}

void test1()
{
   printf( "Function1 \n" );
}

void test2()
{
    printf( "Function2 \n" );
}

void test3()
{
    printf( "Function3 \n" );
}

void test4()
{
    printf( "Function4 \n" );
}

Output:

From Main function....!
Function4
Function3
Function2
Function1

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