[issue22003] BytesIO copy-on-write
Antoine Pitrou
report at bugs.python.org
Tue Jul 22 20:50:01 CEST 2014
Antoine Pitrou added the comment:
There's also the following code in numpy's getbuffer method:
/*
* If a read-only buffer is requested on a read-write array, we return a
* read-write buffer, which is dubious behavior. But that's why this call
* is guarded by PyArray_ISWRITEABLE rather than (flags &
* PyBUF_WRITEABLE).
*/
if (PyArray_ISWRITEABLE(self)) {
if (array_might_be_written(self) < 0) {
goto fail;
}
}
... which seems to imply that mmap is not the only one with "dubious behaviour" (?).
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<http://bugs.python.org/issue22003>
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