X-Git-Url: https://diplodocus.org/git/nmh/blobdiff_plain/1691e80890e5d8ba258c51c214a3e91880e1db2b..94187a80bd60baab4b9c4b949ad820d730578123:/sbr/done.c

diff --git a/sbr/done.c b/sbr/done.c
index 02465ea0..5f2bc8db 100644
--- a/sbr/done.c
+++ b/sbr/done.c
@@ -1,14 +1,32 @@
-
-/*
- * done.c -- terminate the program
+/* done.c -- terminate the program
  *
- * $Id$
+ * This code is Copyright (c) 2002, by the authors of nmh.  See the
+ * COPYRIGHT file in the root directory of the nmh distribution for
+ * complete copyright information.
  */
 
 #include <h/mh.h>
 
+static void (*altexit)(int) NORETURN = exit;
+
+/* set_done changes the path of done() from exit(3), or back to exit(3).
+ * Anything else will work, but a standard-error warning will report the
+ * old non-exit() value has been trampled. */
 void
-done (int status)
+set_done(void (*new)(int) NORETURN)
+{
+    generic_pointer gpo, gpn;
+
+    if (altexit != exit && new != exit) {
+        gpo.f = (void (*)(void))altexit;
+        gpn.f = (void (*)(void))new;
+        inform("altexit trampled: %p %p", gpo.v, gpn.v);
+    }
+    altexit = new;
+}
+
+void NORETURN
+done(int status)
 {
-    exit (status);
+    (*altexit)(status);
 }