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bpo-36648: fix mmap issue for VxWorks #12394

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Merged
vstinner merged 3 commits into from
May 21, 2019
Merged

bpo-36648: fix mmap issue for VxWorks #12394

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f642293
bpo-31904: fix VxWorks MAP_ANON issue
LihuaZhao Mar 18, 2019
95b47f3
add news file
LihuaZhao Mar 18, 2019
78bf212
Rephrase the comment message
LihuaZhao Apr 18, 2019
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1 change: 1 addition & 0 deletions Misc/NEWS.d/next/Library/2019-03-18-14-25-36.bpo-31904.ds3d67.rst
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@@ -0,0 +1 @@
Fix mmap fail for VxWorks
7 changes: 7 additions & 0 deletions Modules/mmapmodule.c
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Expand Up @@ -1162,6 +1162,13 @@ new_mmap_object(PyTypeObject *type, PyObject *args, PyObject *kwdict)
#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);
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