m_backup.c: Move interface to own file.

[nmh] / sbr / done.c

diff --git a/sbr/done.c b/sbr/done.c
index bcc258ccf104cdc136b6ab00ec0d53113a81c61c..8b197b256db4799ac924d83e9f8dba4b7808ace6 100644 (file)
--- a/sbr/done.c
+++ b/sbr/done.c
@@ -1,21 +1,33 @@
-
-/*
- * done.c -- terminate the program
- *
- * $Id$
+/* done.c -- terminate the program
  *
  * 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>
+#include "h/mh.h"
+#include "error.h"
+
+static void (*altexit)(int) NORETURN = exit;
 
-int (*done) (int) = default_done;
+/* 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
+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;
+}
 
-int
-default_done (int status)
+void NORETURN
+done(int status)
 {
-    exit (status);
-    return 1;  /* dead code to satisfy the compiler */
+    (*altexit)(status);
 }