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It is valid to create a new queue with O_CREAT without specifying an attribute structure, in which case system-specific default attributes will be used. The mode should always be specified and if the mq attributes are missing, a NULL pointer should be used in its place. Otherwise, stack garbage will be used for the mode and the attributes, which often results in failure with EINVAL (due to mq_msgsize and mq_maxmsg being too large).
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It is valid to create a new queue with O_CREAT without specifying an attribute structure, in which case system-specific default attributes will be used. The mode should always be specified and if the mq attributes are missing, a NULL pointer should be used in its place.
Otherwise, stack garbage will be used for the mode and the attributes, which often results in failure with EINVAL (due to mq_msgsize and mq_maxmsg being too large).