bpo-36648: fix mmap issue for VxWorks (GH-12394)
The mmap module set MAP_SHARED flag when map anonymous memory, however VxWorks
only support MAP_PRIVATE when map anonymous memory, this commit clear MAP_SHARED
and set MAP_PRIVATE.
diff --git a/Misc/NEWS.d/next/Library/2019-03-18-14-25-36.bpo-31904.ds3d67.rst b/Misc/NEWS.d/next/Library/2019-03-18-14-25-36.bpo-31904.ds3d67.rst
new file mode 100644
index 0000000..fd82fe0
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2019-03-18-14-25-36.bpo-31904.ds3d67.rst
@@ -0,0 +1 @@
+Fix mmap fail for VxWorks
diff --git a/Modules/mmapmodule.c b/Modules/mmapmodule.c
index 33366b2..917c636 100644
--- a/Modules/mmapmodule.c
+++ b/Modules/mmapmodule.c
@@ -1164,6 +1164,13 @@
#ifdef MAP_ANONYMOUS
/* BSD way to map anonymous memory */
flags |= MAP_ANONYMOUS;
+
+ /* VxWorks only supports MAP_ANONYMOUS with MAP_PRIVATE flag */
+#ifdef __VXWORKS__
+ flags &= ~MAP_SHARED;
+ flags |= MAP_PRIVATE;
+#endif
+
#else
/* SVR4 method to map anonymous memory is to open /dev/zero */
fd = devzero = _Py_open("/dev/zero", O_RDWR);