/* * 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); }