From 37038e63935ecfbb2c6a401fa519ce4d10dec0c2 Mon Sep 17 00:00:00 2001
From: mdw <mdw>
Date: Sat, 29 Jul 2000 21:58:15 +0000
Subject: [PATCH] (l_destroy): New function for destroying locked memory
 blocks.

---
 lmem.c | 36 ++++++++++++++++++++++++++++++++++--
 lmem.h | 39 +++++++++++++++++++--------------------
 2 files changed, 53 insertions(+), 22 deletions(-)

diff --git a/lmem.c b/lmem.c
index a56108a..8a21a6f 100644
--- 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
diff --git a/lmem.h b/lmem.h
index 8f24903..36204c6 100644
--- a/lmem.h
+++ b/lmem.h
@@ -1,6 +1,6 @@
 /* -*-c-*-
  *
- * $Id: lmem.h,v 1.2 2000/06/17 11:29:38 mdw Exp $
+ * $Id: lmem.h,v 1.3 2000/07/29 21:58:15 mdw Exp $
  *
  * Locked memory allocation
  *
@@ -30,6 +30,9 @@
 /*----- Revision history --------------------------------------------------* 
  *
  * $Log: lmem.h,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 11:29:38  mdw
  * Add arena support.
  *
@@ -77,6 +80,7 @@ enum {
 
 typedef struct lmem {
   arena a;				/* Arena header block */
+  unsigned f;				/* Various flags */
   char *p;				/* Pointer to locked buffer */
   l_node *l;				/* Pointer to block list */
   size_t sz;				/* Size of locked buffer */
@@ -84,12 +88,9 @@ typedef struct lmem {
   int err; char *emsg;			/* Error indicators */
 } lmem;
 
-/* --- Locked memory arena --- */
-
-typedef struct lmem_arena {
-  arena a;
-  lmem l;
-} lmem_arena;
+enum {
+  LF_LOCKED = 1
+};
 
 /*----- Functions provided ------------------------------------------------*/
 
@@ -147,6 +148,17 @@ extern void l_free(lmem */*lm*/, void */*p*/);
 
 extern void l_purge(lmem */*lm*/);
 
+/* --- @l_destroy@ --- *
+ *
+ * Arguments:	@lmem *lm@ = pointer to locked memory descriptor
+ *
+ * Returns:	---
+ *
+ * Use:		Disposes of a locked memory arena permanently.
+ */
+
+extern void l_destroy(lmem */*lm*/);
+
 /* --- @l_report@ --- *
  *
  * Arguments:	@lmem *lm@ = pointer to locked memory descriptor
@@ -163,19 +175,6 @@ extern void l_purge(lmem */*lm*/);
 
 extern int l_report(lmem */*lm*/, dstr */*d*/);
 
-/*----- Arena management --------------------------------------------------*/
-
-/* --- @l_arena@ --- *
- *
- * Arguments:	@lmem_arena *l@ = pointer to arena block
- *
- * Returns:	---
- *
- * Use:		Initializes a locked-memory arena.
- */
-
-extern void l_arena(lmem_arena */*l*/);
-
 /*----- That's all, folks -------------------------------------------------*/
 
 #ifdef __cplusplus
-- 
2.11.0