com32/lib/onexit.c

   1 /*
   2  * onexit.c
   3  */
   4
   5 #include <stdlib.h>
   6 #include <unistd.h>
   7 #include "atexit.h"
   8
   9 extern __noreturn(*__exit_handler) (int);
  10 static struct atexit *__atexit_list;
  11
  12 static __noreturn on_exit_exit(int rv)
  13 {
  14     struct atexit *ap;
  15
  16     for (ap = __atexit_list; ap; ap = ap->next) {
  17         ap->fctn(rv, ap->arg);  /* This assumes extra args are harmless */
  18     }
  19
  20     _exit(rv);
  21 }
  22
  23 int on_exit(void (*fctn) (int, void *), void *arg)
  24 {
  25     struct atexit *as = malloc(sizeof(struct atexit));
  26
  27     if (!as)
  28         return -1;
  29
  30     as->fctn = fctn;
  31     as->arg = arg;
  32
  33     as->next = __atexit_list;
  34     __atexit_list = as;
  35
  36     __exit_handler = on_exit_exit;
  37
  38     return 0;
  39 }