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/*

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

 * with on_exit().  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 (*efuncp) (int, void *);

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

 * exit() without screwing everything up. The value passed in through arg gets

 * used as the next exit status.

 */

static void exitfunc0(int status, void *arg) { printf("Executing exitfunc0 (status=%d, arg=%d)\n", status, (int)arg); exit((int)arg);}

static void exitfunc1(int status, void *arg) { printf("Executing exitfunc1 (status=%d, arg=%d)\n", status, (int)arg); exit((int)arg);}

static void exitfunc2(int status, void *arg) { printf("Executing exitfunc2 (status=%d, arg=%d)\n", status, (int)arg); exit((int)arg);}

static void exitfunc3(int status, void *arg) { printf("Executing exitfunc3 (status=%d, arg=%d)\n", status, (int)arg); exit((int)arg);}

static void exitfunc4(int status, void *arg) { printf("Executing exitfunc4 (status=%d, arg=%d)\n", status, (int)arg); exit((int)arg);}

static void exitfunc5(int status, void *arg) { printf("Executing exitfunc5 (status=%d, arg=%d)\n", status, (int)arg); exit((int)arg);}

static void exitfunc6(int status, void *arg) { printf("Executing exitfunc6 (status=%d, arg=%d)\n", status, (int)arg); exit((int)arg);}

static void exitfunc7(int status, void *arg) { printf("Executing exitfunc7 (status=%d, arg=%d)\n", status, (int)arg); exit((int)arg);}

static void exitfunc8(int status, void *arg) { printf("Executing exitfunc8 (status=%d, arg=%d)\n", status, (int)arg); exit((int)arg);}

static void exitfunc9(int status, void *arg) { printf("Executing exitfunc9 (status=%d, arg=%d)\n", status, (int)arg); exit((int)arg);}

static void exitfunc10(int status, void *arg) { printf("Executing exitfunc10 (status=%d, arg=%d)\n", status, (int)arg); exit((int)arg);}

static void exitfunc11(int status, void *arg) { printf("Executing exitfunc11 (status=%d, arg=%d)\n", status, (int)arg); exit((int)arg);}

static void exitfunc12(int status, void *arg) { printf("Executing exitfunc12 (status=%d, arg=%d)\n", status, (int)arg); exit((int)arg);}

static void exitfunc13(int status, void *arg) { printf("Executing exitfunc13 (status=%d, arg=%d)\n", status, (int)arg); exit((int)arg);}

static void exitfunc14(int status, void *arg) { printf("Executing exitfunc14 (status=%d, arg=%d)\n", status, (int)arg); exit((int)arg);}

static void exitfunc15(int status, void *arg) { printf("Executing exitfunc15 (status=%d, arg=%d)\n", status, (int)arg); exit((int)arg);}

static void exitfunc16(int status, void *arg) { printf("Executing exitfunc16 (status=%d, arg=%d)\n", status, (int)arg); exit((int)arg);}

static void exitfunc17(int status, void *arg) { printf("Executing exitfunc17 (status=%d, arg=%d)\n", status, (int)arg); exit((int)arg);}

static void exitfunc18(int status, void *arg) { printf("Executing exitfunc18 (status=%d, arg=%d)\n", status, (int)arg); exit((int)arg);}

static void exitfunc19(int status, void *arg) { printf("Executing exitfunc19 (status=%d, arg=%d)\n", status, (int)arg); exit((int)arg);}

static void exitfunc20(int status, void *arg) { printf("Executing exitfunc20 (status=%d, arg=%d)\n", status, (int)arg); exit((int)arg);}

static void exitfunc21(int status, void *arg) { printf("Executing exitfunc21 (status=%d, arg=%d)\n", status, (int)arg); exit((int)arg);}

static void exitfunc22(int status, void *arg) { printf("Executing exitfunc22 (status=%d, arg=%d)\n", status, (int)arg); exit((int)arg);}

static void exitfunc23(int status, void *arg) { printf("Executing exitfunc23 (status=%d, arg=%d)\n", status, (int)arg); exit((int)arg);}

static void exitfunc24(int status, void *arg) { printf("Executing exitfunc24 (status=%d, arg=%d)\n", status, (int)arg); exit((int)arg);}

static efuncp 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 ON_EXIT_LIMIT 20

int

main ( void )

{

        int i = 0;

        int count = 0;

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

        /* loop until no more can be added */

        while(count < ON_EXIT_LIMIT && on_exit(func_table[i], (void *)count) >= 0) {

                count++;

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

                i = (i+1) % numfuncs;

        }

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

        exit(count);

}