[issue11277] Crash with mmap and sparse files on Mac OS X

[STINNER Victor]

STINNER Victor <victor.stinner at haypocalc.com> added the comment:

Oh, fcntl has already a F_FULLFSYNC constant, so we can use like fcntl.fcntl(fd, fcntl.F_FULLFSYNC) in Python.

> can you add a sentence in mmap doc to explain that mmap.mmap()
> does flush the file on Mac OS X and VMS?

Hum, it does flush the file on VMS using fsync(), but on Mac OS X, it does just set F_FULLFSYNC flag using fcntl. It doesn't call fsync() explicitly. Does mmap() "call fsync()" implicitly?

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