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bpo-36648: fix mmap issue for VxWorks (GH-12394)

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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.
This commit is contained in:
Lihua Zhao 2019-05-21 18:50:14 +08:00 • committed by Victor Stinner
parent f2d7ac7e5b
commit 4fb1502189
2 changed files with 8 additions and 0 deletions
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1
Misc/NEWS.d/next/Library/2019-03-18-14-25-36.bpo-31904.ds3d67.rst Normal file
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@ -0,0 +1 @@
Fix mmap fail for VxWorks

7
Modules/mmapmodule.c
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@ -1164,6 +1164,13 @@ new_mmap_object(PyTypeObject *type, PyObject *args, PyObject *kwdict)
#ifdef MAP_ANONYMOUS #ifdef MAP_ANONYMOUS
/* BSD way to map anonymous memory */ /* BSD way to map anonymous memory */
flags |= MAP_ANONYMOUS; flags |= MAP_ANONYMOUS;
/* VxWorks only supports MAP_ANONYMOUS with MAP_PRIVATE flag */
#ifdef __VXWORKS__
flags &= ~MAP_SHARED;
flags |= MAP_PRIVATE;
#endif
#else #else
/* SVR4 method to map anonymous memory is to open /dev/zero */ /* SVR4 method to map anonymous memory is to open /dev/zero */
fd = devzero = _Py_open("/dev/zero", O_RDWR); fd = devzero = _Py_open("/dev/zero", O_RDWR);