the listen socket properly. This caused spurious rpcbind(8)
failures.
- Don't define a "credmsg" structure. Instead, dynamically
allocate a buffer of the correct size of the message with
CMSG_SPACE() and free it when we're done. This gets the
size of the buffer right on LP64 platforms, which has padding
for alignment thrown in.
- Check for non-present or truncated cred messages when recvmsg(2)
returns.
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