Christian Heimes added the comment:
Oh sorry, I looked in the wrong location and missed it.
* if (PyErr_CheckSignals() < 0) {return NULL;} does not free buffer with
PyMem_Free(buffer);
* The function allocates memory once with PyMem_Malloc() and later a second
time with PyBytes_FromStringAndSize(buffer, n). You can avoid the first
allocation and a memcpy() with PyBytes_FromStringAndSize(NULL, n) and
PyBytes_AS_STRING().
* The syscall can also raise EPERM as reported by a user on QNAP. IIRC a
seccomp policy caused EPERM.
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versions: +Python 3.6
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<http://bugs.python.org/issue27778>
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