Steffen Daode Nurpmeso <sdao...@googlemail.com> added the comment:
Took some time, but here is a patch that makes mmap(2) work on
Mac OS X.
This also applies to #11779.
Background:
on OS X, fsync(2) seems to behave as fdatasync(2).
To give people the possibility to do some kind of fync(2)
nonetheless, a new fcntl(2) has been introduced: F_FULLFSYNC.
If you use that, the ,sparse` file is synchronized with physical
backing store immediately and all is fine.
Vampire magic!
----------
Added file: http://bugs.python.org/file21715/11277.3.diff
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue11277>
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diff --git a/Lib/test/test_zlib.py b/Lib/test/test_zlib.py
--- a/Lib/test/test_zlib.py
+++ b/Lib/test/test_zlib.py
@@ -70,7 +70,7 @@
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):
diff --git a/Modules/mmapmodule.c b/Modules/mmapmodule.c
--- 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 +1125,10 @@
"mmap invalid access parameter.");
}
+#ifdef __APPLE__
+ 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 */
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