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As of Windows 10 version 1803, Unix-domain sockets are supported on Windows. But it's not automatically detected by configure because it looks for struct sockaddr_un and Windows doesn't define that. So we just make our own definition on Windows and override the configure result. Set DEFAULT_PGSOCKET_DIR to empty on Windows so by default no Unix-domain socket is used, because there is no good standard location. In pg_upgrade, we have to do some extra tweaking to preserve the existing behavior of not using Unix-domain sockets on Windows. Adding support would be desirable, but it needs further work, in particular a way to select whether to use Unix-domain sockets from the command-line or with a run-time test. The pg_upgrade test script needs a fix. The previous code passed "localhost" to postgres -k, which only happened to work because Windows used to ignore the -k argument value altogether. We instead need to pass an empty string to get the desired effect. The test suites will continue to not use Unix-domain sockets on Windows. This requires a small tweak in pg_regress.c. The TAP tests don't need to be changed because they decide by the operating system rather than HAVE_UNIX_SOCKETS. Reviewed-by: Andrew Dunstan <andrew.dunstan@2ndquadrant.com> Discussion: https://www.postgresql.org/message-id/flat/54bde68c-d134-4eb8-5bd3-8af33b72a010@2ndquadrant.com