diff options
| -rw-r--r-- | Doc/library/mmap.rst | 4 | ||||
| -rw-r--r-- | Lib/test/test_zlib.py | 2 | ||||
| -rw-r--r-- | Misc/NEWS | 3 | ||||
| -rw-r--r-- | Modules/mmapmodule.c | 9 |
4 files changed, 17 insertions, 1 deletions
diff --git a/Doc/library/mmap.rst b/Doc/library/mmap.rst index 128bc90..7a901c9 100644 --- a/Doc/library/mmap.rst +++ b/Doc/library/mmap.rst @@ -86,6 +86,10 @@ To map anonymous memory, -1 should be passed as the fileno along with the length defaults to 0. *offset* must be a multiple of the PAGESIZE or ALLOCATIONGRANULARITY. + To ensure validity of the created memory mapping the file specified + by the descriptor *fileno* is internally automatically synchronized + with physical backing store on Mac OS X and OpenVMS. + This example shows a simple way of using :class:`mmap`:: import mmap diff --git a/Lib/test/test_zlib.py b/Lib/test/test_zlib.py index 5d38d97..9aafffa 100644 --- a/Lib/test/test_zlib.py +++ b/Lib/test/test_zlib.py @@ -70,7 +70,7 @@ class ChecksumBigBufferTestCase(unittest.TestCase): with open(support.TESTFN, "wb+") as f: f.seek(_4G) f.write(b"asdf") - with open(support.TESTFN, "rb") as f: + f.flush() self.mapping = mmap.mmap(f.fileno(), 0, access=mmap.ACCESS_READ) def tearDown(self): @@ -132,6 +132,9 @@ Core and Builtins Library ------- +- Issue #11277: mmap.mmap() calls fcntl(fd, F_FULLFSYNC) on Mac OS X to get + around a mmap bug with sparse files. Patch written by Steffen Daode Nurpmeso. + - Issue #8407: Add signal.pthread_sigmask() function to fetch and/or change the signal mask of the calling thread. diff --git a/Modules/mmapmodule.c b/Modules/mmapmodule.c index fdf3922..36ca67d 100644 --- a/Modules/mmapmodule.c +++ b/Modules/mmapmodule.c @@ -23,6 +23,9 @@ #ifndef MS_WINDOWS #define UNIX +# ifdef __APPLE__ +# include <fcntl.h> +# endif #endif #ifdef MS_WINDOWS @@ -1122,6 +1125,12 @@ new_mmap_object(PyTypeObject *type, PyObject *args, PyObject *kwdict) "mmap invalid access parameter."); } +#ifdef __APPLE__ + /* Issue #11277: fsync(2) is not enough on OS X - a special, OS X specific + fcntl(2) is necessary to force DISKSYNC and get around mmap(2) bug */ + if (fd != -1) + (void)fcntl(fd, F_FULLFSYNC); +#endif #ifdef HAVE_FSTAT # ifdef __VMS /* on OpenVMS we must ensure that all bytes are written to the file */ |