ClickHouse/dbms/src/Common/getFQDNOrHostName.h

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#pragma once
#include <string>
/** Get the FQDN for the local server by resolving DNS hostname - similar to calling the 'hostname' tool with the -f flag.
* If it does not work, return hostname - similar to calling 'hostname' without flags or 'uname -n'.
*/
const std::string & getFQDNOrHostName();