X-Git-Url: http://git.ozlabs.org/?a=blobdiff_plain;f=ccan%2Fmem%2Fmem.h;h=19f69c038c67efe1e11ac8ab5cec036123aa3b95;hb=e16fc94bd8f80800d5203d9182cb3c5224528b0a;hp=a3403c4ee31dc8794f89acfd95836e5c17c4672a;hpb=2f00b7cc95a9dc9ac7c0cb42eee38bbb639576d6;p=ccan

diff --git a/ccan/mem/mem.h b/ccan/mem/mem.h
index a3403c4e..19f69c03 100644
--- a/ccan/mem/mem.h
+++ b/ccan/mem/mem.h
@@ -250,6 +250,7 @@ static inline void *memcheck_(const void *data, size_t len)
 #else
 static inline void *memcheck_(const void *data, size_t len)
 {
+	(void)len;
 	return (void *)data;
 }
 #endif
@@ -275,4 +276,20 @@ static inline void *memcheck_(const void *data, size_t len)
 #else
 #define memcheck(data, len) memcheck_((data), (len))
 #endif
+
+/**
+ * memtaint - mark a memory region unused
+ * @data: start of region
+ * @len: length in bytes
+ *
+ * This writes an "0xdeadbeef" eyecatcher repeatedly to the memory.
+ * When running under valgrind, it also tells valgrind that the memory is
+ * uninitialized, triggering valgrind errors if it is used for branches
+ * or written out (or passed to memcheck!) in future.
+ *
+ * Example:
+ *	// We'll reuse this buffer later, but be sure we don't access it.
+ *	memtaint(somebytes, bytes_len);
+ */
+void memtaint(void *data, size_t len);
 #endif /* CCAN_MEM_H */