Add an internal-representation no-op function.

[u/mdw/catacomb] / lmem.c

diff --git a/lmem.c b/lmem.c
index a56108a..8a21a6f 100644 (file)
--- a/lmem.c
+++ b/lmem.c
@@ -1,6 +1,6 @@
 /* -*-c-*-
  *
- * $Id: lmem.c,v 1.2 2000/06/17 11:29:20 mdw Exp $
+ * $Id: lmem.c,v 1.3 2000/07/29 21:58:15 mdw Exp $
  *
  * Locked memory allocation (Unix-specific)
  *
@@ -30,6 +30,9 @@
 /*----- Revision history --------------------------------------------------* 
  *
  * $Log: lmem.c,v $
+ * Revision 1.3  2000/07/29 21:58:15  mdw
+ * (l_destroy): New function for destroying locked memory blocks.
+ *
  * Revision 1.2  2000/06/17 11:29:20  mdw
  * Add arena support.
  *
@@ -97,6 +100,7 @@ int l_init(lmem *lm, size_t sz)
 
   lm->a.ops = &l_ops;
   lm->err = 0;
+  lm->f = 0;
 
   /* --- Try making a secure locked passphrase buffer --- *
    *
@@ -133,7 +137,8 @@ int l_init(lmem *lm, size_t sz)
     lm->err = errno;
     munmap(p, sz);
     p = 0;
-  }
+  } else
+    lm->f |= LF_LOCKED;
 
 #endif
 
@@ -295,6 +300,33 @@ void l_purge(lmem *lm)
   lm->free = l->sz;
 }
 
+/* --- @l_destroy@ --- *
+ *
+ * Arguments:  @lmem *lm@ = pointer to locked memory descriptor
+ *
+ * Returns:    ---
+ *
+ * Use:                Disposes of a locked memory arena permanently.
+ */
+
+void l_destroy(lmem *lm)
+{
+  l_node *l;
+
+  l = lm->l;
+  while (l) {
+    l_node *ll = l->next;
+    DESTROY(l);
+    l = ll;
+  }
+  memset(lm->p, 0, lm->sz);
+
+  if (lm->f & LF_LOCKED)
+    munmap(lm->p, lm->sz);
+  else
+    free(lm->p);
+}
+
 /* --- @l_report@ --- *
  *
  * Arguments:  @lmem *lm@ = pointer to locked memory descriptor