[3.7] bpo-34521: Fix tests in test_multiprocessing_spawn to use correctly CMSG_SPACE (GH-9613) #9619
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…MSG_SPACE (pythonGH-9613) After some failures in AMD64 FreeBSD CURRENT Debug 3.x buildbots regarding tests in test_multiprocessing_spawn and after examining similar failures in test_socket, some errors in the calculation of ancillary data buffers were found in multiprocessing.reduction. CMSG_LEN() can often be used as the buffer size for recvmsg() to receive a single item of ancillary data, but RFC 3542 requires portable applications to use CMSG_SPACE() and thus include space for padding, even when the item will be the last in the buffer. The failures we experience are due to the usage of CMSG_LEN() instead of CMSG_SPACE(). (cherry picked from commit 077061a) Co-authored-by: Pablo Galindo <Pablogsal@gmail.com>
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@pablogsal and @vstinner: Status check is done, and it's a failure ❌ . |
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After some failures in AMD64 FreeBSD CURRENT Debug 3.x buildbots
regarding tests in test_multiprocessing_spawn and after examining
similar failures in test_socket, some errors in the calculation of
ancillary data buffers were found in multiprocessing.reduction.
CMSG_LEN() can often be used as the buffer size for recvmsg() to
receive a single item of ancillary data, but RFC 3542 requires portable
applications to use CMSG_SPACE() and thus include space for padding,
even when the item will be the last in the buffer.
The failures we experience are due to the usage of CMSG_LEN() instead of
CMSG_SPACE().
(cherry picked from commit 077061a)
Co-authored-by: Pablo Galindo Pablogsal@gmail.com
https://bugs.python.org/issue34521