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Ken Brown
852fb2afba
Cygwin: AF_UNIX: allow more than one control message
Previously, create_cmsg_data and evaluate_cmsg_data required the ancillary data to contain only a single control message, of type SCM_CREDENTIALS. In preparation for supporting SCM_RIGHTS in the future, allow more than one. create_cmsg_data now iterates through the specified control messages and allows both SCM_CREDENTIALS and SCM_RIGHTS. If no SCM_CREDENTIALS message is present, it creates one. This was previously done in sendmsg. evaluate_cmsg_data also iterates through the received control messages and allows both SCM_CREDENTIALS and SCM_RIGHTS. Control messages of type SCM_CREDENTIALS are discarded unless the SO_PASSCRED option has been set. Update tests.
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