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-rw-r--r--include/malloc.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/include/malloc.h b/include/malloc.h
index b16a1105a..e52792381 100644
--- a/include/malloc.h
+++ b/include/malloc.h
@@ -162,6 +162,8 @@ extern int malloc_trim(size_t pad);
/* Prints brief summary statistics on the stderr. */
extern void malloc_stats(void);
+extern size_t malloc_usable_size(void *);
+
/* SVID2/XPG mallopt options */
#ifndef M_MXFAST
# define M_MXFAST 1 /* UNUSED in this malloc */