--- /dev/null
+/*
+ * onexit.c
+ */
+
+#include <stdlib.h>
+#include <unistd.h>
+#include "atexit.h"
+
+extern __noreturn (*__exit_handler)(int);
+static struct atexit *__atexit_list;
+
+static __noreturn on_exit_exit(int rv)
+{
+ struct atexit *ap;
+
+ for ( ap = __atexit_list ; ap ; ap = ap->next ) {
+ ap->fctn(rv, ap->arg); /* This assumes extra args are harmless */
+ }
+
+ _exit(rv);
+}
+
+int on_exit(void (*fctn)(int, void *), void *arg)
+{
+ struct atexit *as = malloc(sizeof(struct atexit));
+
+ if ( !as )
+ return -1;
+
+ as->fctn = fctn;
+ as->arg = arg;
+
+ as->next = __atexit_list;
+ __atexit_list = as;
+
+ __exit_handler = on_exit_exit;
+
+ return 0;
+}