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 }