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.
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Fix mmap fail for VxWorks
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@ -1164,6 +1164,13 @@ new_mmap_object(PyTypeObject *type, PyObject *args, PyObject *kwdict)
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#ifdef MAP_ANONYMOUS
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/* BSD way to map anonymous memory */
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flags |= MAP_ANONYMOUS;
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/* VxWorks only supports MAP_ANONYMOUS with MAP_PRIVATE flag */
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#ifdef __VXWORKS__
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flags &= ~MAP_SHARED;
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flags |= MAP_PRIVATE;
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#endif
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#else
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/* SVR4 method to map anonymous memory is to open /dev/zero */
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fd = devzero = _Py_open("/dev/zero", O_RDWR);
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