Tom Lane
25b2499d56
Produce a more useful error message for over-length Unix socket paths.
The length of a socket path name is constrained by the size of struct sockaddr_un, and there's not a lot we can do about it since that is a kernel API. However, it would be a good thing if we produced an intelligible error message when the user specifies a socket path that's too long --- and getaddrinfo's standard API is too impoverished to do this in the natural way. So insert explicit tests at the places where we construct a socket path name. Now you'll get an error that makes sense and even tells you what the limit is, rather than something generic like "Non-recoverable failure in name resolution". Per trouble report from Jeremy Drake and a fix idea from Andrew Dunstan.
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