--- /dev/null
+/* Copyright (c) 2010-2023. The SimGrid Team. All rights reserved. */
+
+/* This program is free software; you can redistribute it and/or modify it
+ * under the terms of the license (GNU LGPL) which comes with this package. */
+
+/* Copyright (C) 1991, 1992 Free Software Foundation, Inc.
+ This file was then part of the GNU C Library. */
+
+#ifndef SIMGRID_MMALLOC_H
+#define SIMGRID_MMALLOC_H
+
+#include "src/internal_config.h"
+
+/** Environment variable name used to pass the communication socket.
+ *
+ * It is set by `simgrid-mc` to enable MC support in the children processes.
+ *
+ * It is placed in this file so that it's visible from mmalloc and MC without sharing anythin of xbt in mmalloc
+ */
+#define MC_ENV_SOCKET_FD "SIMGRID_MC_SOCKET_FD"
+
+#include <stdio.h> /* for NULL */
+#include <sys/types.h> /* for size_t */
+
+SG_BEGIN_DECL
+
+/* Datatype representing a separate heap. The whole point of the mmalloc module is to allow several such heaps in the
+ * process. It thus works by redefining all the classical memory management functions (malloc and friends) with an
+ * extra first argument: the heap in which the memory is to be taken.
+ *
+ * The heap structure itself is an opaque object that shouldn't be messed with.
+ */
+typedef struct mdesc s_xbt_mheap_t;
+typedef s_xbt_mheap_t* xbt_mheap_t;
+
+#if HAVE_MMALLOC
+/* Allocate SIZE bytes of memory (and memset it to 0). */
+XBT_PUBLIC void* mmalloc(xbt_mheap_t md, size_t size);
+
+/* Allocate SIZE bytes of memory (and don't mess with it) */
+void* mmalloc_no_memset(xbt_mheap_t mdp, size_t size);
+
+/* Re-allocate the previously allocated block in void*, making the new block SIZE bytes long. */
+XBT_PUBLIC void* mrealloc(xbt_mheap_t md, void* ptr, size_t size);
+
+/* Free a block allocated by `mmalloc', `mrealloc' or `mcalloc'. */
+XBT_PUBLIC void mfree(xbt_mheap_t md, void* ptr);
+
+#define XBT_MHEAP_OPTION_MEMSET 1
+
+XBT_PUBLIC xbt_mheap_t xbt_mheap_new(void* baseaddr, int options);
+
+XBT_PUBLIC void* xbt_mheap_destroy(xbt_mheap_t md);
+
+/* To get the heap used when using the legacy version malloc/free/realloc and such */
+xbt_mheap_t mmalloc_get_current_heap(void);
+
+/* Returns true if we are using the internal mmalloc, and false if we are using the libc's malloc */
+XBT_PUBLIC int malloc_use_mmalloc(void);
+
+#endif
+SG_END_DECL
+
+#endif /* SIMGRID_MMALLOC_H */
