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And use it in recvmsg. I'm not sure this implementation is what was intended when the evaluate_cmsg_data method was added. For now, just support an ancillary data block consisting of a single cmsghdr, containing SCM_CREDENTIALS. For convenience, add a 'mshdr *' argument and make the 'cloexec' argument false by default. The 'cloexec' argument is not currently used, and I want to avoid having to artificially specify a value for it when recvmsg calls evaluate_cmsg_data.
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