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authorMax Kellermann <max@duempel.org>2009-03-09 19:09:30 +0100
committerMax Kellermann <max@duempel.org>2009-03-09 19:09:30 +0100
commitfd76e29fbaac10158e47fcec44133a038fb23909 (patch)
tree3c41f7622e751a8e5a3fbfee0e057740cdd08813 /src
parent71e88271d96953e5ff10d4dce02715d7f06e0bb3 (diff)
downloadmpd-fd76e29fbaac10158e47fcec44133a038fb23909.tar.gz
mpd-fd76e29fbaac10158e47fcec44133a038fb23909.tar.xz
mpd-fd76e29fbaac10158e47fcec44133a038fb23909.zip
added memory poisoning library
Memory poisoning is useful for marking memory regions as "undefined". This poisoning only enabled in the debug build (!NDEBUG).
Diffstat (limited to 'src')
-rw-r--r--src/poison.h61
1 files changed, 61 insertions, 0 deletions
diff --git a/src/poison.h b/src/poison.h
new file mode 100644
index 000000000..d37ff233e
--- /dev/null
+++ b/src/poison.h
@@ -0,0 +1,61 @@
+/*
+ * Copyright (C) 2003-2009 The Music Player Daemon Project
+ * http://www.musicpd.org
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#ifndef MPD_POISON_H
+#define MPD_POISON_H
+
+#ifndef NDEBUG
+#include <string.h>
+#endif
+
+/**
+ * Poisons the specified memory area and marks it as "not accessible".
+ *
+ * @param p pointer to the memory area
+ * @param length number of bytes to poison
+ */
+static inline void
+poison_noaccess(void *p, size_t length)
+{
+#ifdef NDEBUG
+ (void)p;
+ (void)length;
+#else
+ memset(p, 0x01, length);
+#endif
+}
+
+/**
+ * Poisons the specified memory area and marks it as "not defined".
+ *
+ * @param p pointer to the memory area
+ * @param length number of bytes to poison
+ */
+static inline void
+poison_undefined(void *p, size_t length)
+{
+#ifdef NDEBUG
+ (void)p;
+ (void)length;
+#else
+ memset(p, 0x02, length);
+#endif
+}
+
+
+#endif