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/*

 * This test program will register the maximum number of exit functions

 * with atexit().  When this program exits, each exit function should get

 * called in the reverse order in which it was registered.  (If the system

 * supports more than 25 exit functions, the function names will loop, but

 * the effect will be the same.  Feel free to add more functions if desired)

 */

#include <stdio.h>

#include <stdlib.h>

typedef void (*vfuncp) (void);

/* All functions call exit(), in order to test that exit functions can call

 * exit() without screwing everything up. :)

 */

static void exitfunc0(void) { printf("Executing exitfunc0.\n"); exit(0);}

static void exitfunc1(void) { printf("Executing exitfunc1.\n"); exit(0);}

static void exitfunc2(void) { printf("Executing exitfunc2.\n"); exit(0);}

static void exitfunc3(void) { printf("Executing exitfunc3.\n"); exit(0);}

static void exitfunc4(void) { printf("Executing exitfunc4.\n"); exit(0);}

static void exitfunc5(void) { printf("Executing exitfunc5.\n"); exit(0);}

static void exitfunc6(void) { printf("Executing exitfunc6.\n"); exit(0);}

static void exitfunc7(void) { printf("Executing exitfunc7.\n"); exit(0);}

static void exitfunc8(void) { printf("Executing exitfunc8.\n"); exit(0);}

static void exitfunc9(void) { printf("Executing exitfunc9.\n"); exit(0);}

static void exitfunc10(void) { printf("Executing exitfunc10.\n"); exit(0);}

static void exitfunc11(void) { printf("Executing exitfunc11.\n"); exit(0);}

static void exitfunc12(void) { printf("Executing exitfunc12.\n"); exit(0);}

static void exitfunc13(void) { printf("Executing exitfunc13.\n"); exit(0);}

static void exitfunc14(void) { printf("Executing exitfunc14.\n"); exit(0);}

static void exitfunc15(void) { printf("Executing exitfunc15.\n"); exit(0);}

static void exitfunc16(void) { printf("Executing exitfunc16.\n"); exit(0);}

static void exitfunc17(void) { printf("Executing exitfunc17.\n"); exit(0);}

static void exitfunc18(void) { printf("Executing exitfunc18.\n"); exit(0);}

static void exitfunc19(void) { printf("Executing exitfunc19.\n"); exit(0);}

static void exitfunc20(void) { printf("Executing exitfunc20.\n"); exit(0);}

static void exitfunc21(void) { printf("Executing exitfunc21.\n"); exit(0);}

static void exitfunc22(void) { printf("Executing exitfunc22.\n"); exit(0);}

static void exitfunc23(void) { printf("Executing exitfunc23.\n"); exit(0);}

static void exitfunc24(void) { printf("Executing exitfunc24.\n"); exit(0);}

static vfuncp func_table[] =

        {

        exitfunc0, exitfunc1, exitfunc2, exitfunc3, exitfunc4,

        exitfunc5, exitfunc6, exitfunc7, exitfunc8, exitfunc9,

        exitfunc10, exitfunc11, exitfunc12, exitfunc13, exitfunc14,

        exitfunc15, exitfunc16, exitfunc17, exitfunc18, exitfunc19,

        exitfunc20, exitfunc21, exitfunc22, exitfunc23, exitfunc24

        };

/* glibc dynamically adds exit functions, so it will keep adding until

 * it runs out of memory!  So this will limit the number of exit functions

 * we add in the loop below.  uClibc has a set limit (currently 20), so the

 * loop will go until it can't add any more (so it should not hit this limit).

 */

#define ATEXIT_LIMIT 20

int

main ( void )

{

        int i = 0;

        int count = 0;

        int numfuncs = sizeof(func_table)/sizeof(vfuncp);

        /* loop until no more can be added */

        while(count < ATEXIT_LIMIT && atexit(func_table[i]) >= 0) {

                printf("Registered exitfunc%d with atexit()\n", i);

                count++;

                i = (i+1) % numfuncs;

        }

        printf("%d functions registered with atexit.\n", count);

        return 0;

}