Added :const:`mmap.ACCESS_DEFAULT` constant. (#4093)
diff --git a/Doc/library/mmap.rst b/Doc/library/mmap.rst
index f46bf66..184119d 100644
--- a/Doc/library/mmap.rst
+++ b/Doc/library/mmap.rst
@@ -29,16 +29,20 @@
mapping.
For both the Unix and Windows versions of the constructor, *access* may be
-specified as an optional keyword parameter. *access* accepts one of three
-values: :const:`ACCESS_READ`, :const:`ACCESS_WRITE`, or :const:`ACCESS_COPY`
-to specify read-only, write-through or copy-on-write memory respectively.
-*access* can be used on both Unix and Windows. If *access* is not specified,
-Windows mmap returns a write-through mapping. The initial memory values for
-all three access types are taken from the specified file. Assignment to an
-:const:`ACCESS_READ` memory map raises a :exc:`TypeError` exception.
-Assignment to an :const:`ACCESS_WRITE` memory map affects both memory and the
-underlying file. Assignment to an :const:`ACCESS_COPY` memory map affects
-memory but does not update the underlying file.
+specified as an optional keyword parameter. *access* accepts one of four
+values: :const:`ACCESS_READ`, :const:`ACCESS_WRITE`, or :const:`ACCESS_COPY` to
+specify read-only, write-through or copy-on-write memory respectively, or
+:const:`ACCESS_DEFAULT` to defer to *prot*. *access* can be used on both Unix
+and Windows. If *access* is not specified, Windows mmap returns a
+write-through mapping. The initial memory values for all three access types
+are taken from the specified file. Assignment to an :const:`ACCESS_READ`
+memory map raises a :exc:`TypeError` exception. Assignment to an
+:const:`ACCESS_WRITE` memory map affects both memory and the underlying file.
+Assignment to an :const:`ACCESS_COPY` memory map affects memory but does not
+update the underlying file.
+
+.. versionchanged:: 3.7
+ Added :const:`ACCESS_DEFAULT` constant.
To map anonymous memory, -1 should be passed as the fileno along with the length.
diff --git a/Misc/NEWS.d/next/Library/2017-10-23.bpo-31854.fh8334f.rst b/Misc/NEWS.d/next/Library/2017-10-23.bpo-31854.fh8334f.rst
new file mode 100644
index 0000000..6313148
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2017-10-23.bpo-31854.fh8334f.rst
@@ -0,0 +1 @@
+Add ``mmap.ACCESS_DEFAULT`` constant.
diff --git a/Modules/mmapmodule.c b/Modules/mmapmodule.c
index 49214a1..ea7baf4 100644
--- a/Modules/mmapmodule.c
+++ b/Modules/mmapmodule.c
@@ -1466,6 +1466,7 @@
setint(dict, "ALLOCATIONGRANULARITY", (long)my_getallocationgranularity());
+ setint(dict, "ACCESS_DEFAULT", ACCESS_DEFAULT);
setint(dict, "ACCESS_READ", ACCESS_READ);
setint(dict, "ACCESS_WRITE", ACCESS_WRITE);
setint(dict, "ACCESS_COPY", ACCESS_COPY);