--- IO-AIO/AIO.xs	2018/02/20 06:54:46	1.256
+++ IO-AIO/AIO.xs	2018/07/17 23:20:09	1.257
@@ -190,6 +190,10 @@
 # define mprotect(addr,len,prot)              EIO_ENOSYS ()
 #endif
 
+#if !MREMAP_MAYMOVE
+# define mremap(old_address,old_size,new_size,flags,new_address) (errno = ENOSYS, (void *)-1)
+#endif
+
 #define FOREIGN_MAGIC PERL_MAGIC_ext
 
 static int ecb_cold
@@ -1105,6 +1109,9 @@
     const_iv (MAP_HUGETLB)
     const_iv (MAP_STACK)
 
+    const_iv (MREMAP_MAYMOVE)
+    const_iv (MREMAP_FIXED)
+
     const_iv (F_DUPFD_CLOEXEC)
 
     const_iv (F_OFD_GETLK)
@@ -2059,6 +2066,36 @@
 	CODE:
         sv_clear_foreign (scalar);
 
+SV *
+mremap (SV *scalar, STRLEN new_length, int flags = 0, IV new_address = 0)
+	CODE:
+{
+        MAGIC *mg = mg_findext (scalar, FOREIGN_MAGIC, &mmap_vtbl);
+        void *new;
+
+        if (!mg || SvPVX (scalar) != mg->mg_ptr)
+          croak ("IO::AIO::mremap: scalar not mapped by IO::AIO::mmap or improperly modified");
+
+        new = mremap (mg->mg_ptr, (size_t)mg->mg_obj, new_length, flags, (void *)new_address);
+
+        RETVAL = &PL_sv_no;
+
+        if (new != (void *)-1)
+          {
+            RETVAL = new == (void *)mg->mg_ptr
+              ? newSVpvn ("0 but true", 10)
+              : &PL_sv_yes;
+
+            mg->mg_ptr = (char *)new;
+            mg->mg_obj = (SV *)new_length;
+
+            SvPVX (scalar) = mg->mg_ptr;
+            SvCUR_set (scalar, new_length);
+          }
+}
+	OUTPUT:
+        RETVAL
+
 int
 madvise (SV *scalar, STRLEN offset = 0, SV *length = &PL_sv_undef, IV advice_or_prot)
 	ALIAS: