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Prior to this patch, it was occasionally possible, after shm_mq_sendv had previously returned SHM_MQ_DETACHED, for a later shm_mq_sendv operation to fail an assertion instead of just again returning SHM_MQ_ATTACHED. From the shm_mq code's point of view, it was expecting to be called again with the same arguments, since the previous operation had only partially completed. However, a caller who isn't using non-blocking mode won't be prepared to repeat the call with the same arguments, and this code shouldn't expect that they will. Repair in such a way that we'll be OK whether the next call uses the same arguments or not. Found by Andreas Seltenreich. Analysis and sketch of fix by Amit Kapila. Patch by me, reviewed by Amit Kapila. |
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