Add mallinfo2 function that support sizes >= 4GB.

The current int type can easily overflow for allocation of more
than 4GB.

1 files changed, 21 insertions, 0 deletions

diff --git a/malloc/malloc.h b/malloc/malloc.h
index e0e91a9..e25b334 100644
--- a/malloc/malloc.h
+++ b/malloc/malloc.h
@@ -97,9 +97,30 @@ struct mallinfo
   int keepcost; /* top-most, releasable (via malloc_trim) space */
 };
 
+/* SVID2/XPG mallinfo2 structure which can handle allocations
+   bigger than 4GB.  */
+
+struct mallinfo2
+{
+  size_t arena;    /* non-mmapped space allocated from system */
+  size_t ordblks;  /* number of free chunks */
+  size_t smblks;   /* number of fastbin blocks */
+  size_t hblks;    /* number of mmapped regions */
+  size_t hblkhd;   /* space in mmapped regions */
+  size_t usmblks;  /* always 0, preserved for backwards compatibility */
+  size_t fsmblks;  /* space available in freed fastbin blocks */
+  size_t uordblks; /* total allocated space */
+  size_t fordblks; /* total free space */
+  size_t keepcost; /* top-most, releasable (via malloc_trim) space */
+};
+
 /* Returns a copy of the updated current mallinfo. */
+__MALLOC_DEPRECATED;
 extern struct mallinfo mallinfo (void) __THROW;
 
+/* Returns a copy of the updated current mallinfo. */
+extern struct mallinfo2 mallinfo2 (void) __THROW;
+
 /* SVID2/XPG mallopt options */
 #ifndef M_MXFAST
 # define M_MXFAST  1    /* maximum request size for "fastbins" */